22 April 2016

CHECK SIX: Chikuhei Nakajima and his Aircraft Company


So here's something from the "Persons in Aviation History that Don't Get Enough Attention" Department- this is Chikuhei Nakajima, the founder of the Nakajima Aeroplane Company in Japan. Prior to World War II, there were three dominant aircraft manufacturers in Japan- Mitsubishi, Kawasaki, and Nakajima. Both Mitsubishi and Kawasaki were capitalized from their founding by government contracts for military aircraft. Nakajima, on the other hand, was the only major Japanese aircraft company of the time that not only was independent of any other industry (both Mitsubishi and Kawasaki were divisions of per-exisiting industrial corporations), it also was privately capitalized on account of its success with flying its aircraft on air mail routes within Japan. 

Nakajima was a former naval officer with a background in engineering. While he was still in the Navy, in 1912 he spent time in the United States as a student and observer of naval aviation. He spent time studying aircraft manufacturing with Curtiss Aircraft and even learned to fly during his time with the company. When he returned to Japan, he left the Imperial Japanese Navy and started Nakajima Aircraft in December 1917. His business connections helped him raise capital- while Mitsubishi and Kawasaki's aircraft manufacturing was funded by military orders, Nakajima focused on civilian designs that could fly air mail routes in Japan. By 1924, Nakajima was also designing and building his own aircraft engines. In 1931 he retired with his younger brother taking over the company. 

By the end of the war, only Mitsubishi had built more aircraft for the Japanese war effort than Nakajima. By the terms of the surrender agreement and subsequent military occupation of Japan postwar, aircraft companies were forbidden from aircraft development and production. This wasn't so bad for companies like Mitsubishi and Kawasaki which were diversified. Nakajima had to be dissolved, but many of its managers and engineers stayed together in smaller ventures until 1950 when they formed Fuji Heavy Industries. 

The Fuji T-1 jet trainer was Japan's first indigenous jet aircraft following World War 2 when aircraft production was allowed to resume. Fuji builds trainer aircraft for the JASDF and is a subcontractor for several US aerospace companies, but you all might know Fuji more from their automobile division, Subaru. Many of the Nakajima engineers who couldn't work in aviation after the war turned their attention to Japan's then-fledgling automobile industry. Subaru has been such an important part of Fuji Heavy Industries that the Subaru logo in 2003 became the official logo for Fuji itself.

Further reading: 

(Photo: Wikipedia)

19 April 2016

Nakajima's Demon: The Ki-44 Shoki

Throughout World War 2 the standard practice of all of the major powers both Allied and Axis in introducing a new combat aircraft into operational use was that use in combat followed an extensive flight test and pre-production development period. One of rare exceptions to this established practice came with the Nakajima Ki-44 which was christened "Shoki" (Demon) by its pilots. And it wasn't on account of its performance against Allied aircraft- the first pilots to fly the Shoki in combat gave it that name out of disdain for an aircraft that represented a new philosophy in fighter aircraft for the Imperial Japanese Army Air Force.

The Nakajima Ki-44 Shoki's Allied code name was "Tojo"
(San Diego Air and Space Museum Collection)
Until the Ki-44 Shoki (codenamed "Tojo" by the Allies) came along, the prevailing wisdom in Japanese fighter aircraft design was to put maneuverability as the prime design objective- all other considerations were secondary, which to quite an extent explained the relative lack of significant armor protection for fighter pilots, as that would have added weight to the aircraft and adversely impacted maneuverability.

Nakajima had been exploring the ideas of trading off maneuverability for increased speed as far back as the mid-1930s after the experience of the brief border war with the Soviets in which the Polikarpov I-16 savaged the IJAAF by using its superior speed and diving abilities to avoid close combat with the more maneuverable Japanese fighters and conduct hit-and-run attacks. Based on the experience, Nakajima's engineers contracted the services of two French engineers from the Dewointine aircraft company to develop the Ki-12 experimental fighter that in 1935 was more modern and faster than anything else the IJAAF was fielding but it remained experimental as it was deemed too radical for the established fighter design philosophy of the day.

The lead engineer at Nakajima just prior to the outbreak of the Second World War was Professor Hideo Itokawa (who later would become the father of the post-war Japanese space program and have an asteroid named for him in honor of his contributions to space science) revisited the ideas behind the Ki-12 experimental fighter by using a short-span wing which would make for a faster fighter that if highly-loaded, could also be a stable gun platform at high speed. His work is what resulted in the Ki-44 Shoki- a powerful radial engine but a comparatively stubby wing with much higher wing loading that other Japanese fighters.

By 1940 there was a greater willingness in the IJAAF for new ideas and it was decided by the Japanese High Command that the Ki-44 Shoki prototypes would be combat tested before going into production. On 15 September 1941 the IJAAF created an evaluation squadron called the 47th Dokuritsu Hiko Chutai (Independent Air Squadron) equipped with the seven prototype Shoki fighters that were quite literally handbuilt by Nakajima. The initial plans were to combat test the Shoki prototypes in China, but with Japan's declaration of war in December on the Allies, the so-called "Kingfisher" Chutai and its seven prototypes were sent to Malaya for use against the British. The Shokis ranged across the peninsula as the invading Japanese forces pushed the British southward to Singapore, scoring victory after victory on hapless British fighters.

By early 1942, Nakajima began work on 40 pre-production Shokis which had improved armament and other modifications such as a combat flap that was a modified Fowler flap that could be extended rearward with little deflection to improve the lift from the Shoki's stubby wings. As production kinks were being worked out, the Doolittle Raid in May 1942 laid bare the vulnerability to the home islands to Allied air attack and the 47th Chutai was recalled from Malaya for home defense duties where its speed and rate of climb made it a natural bomber interceptor. The last pre-production Ki-44 Shoki was delivered in October 1942 and by the end of 1942, the Imperial Japanese Army Air Force formally accepted the Shoki for operational use- after the prototypes had been in combat for nearly a year!

The Shoki's performance led it to be used primarily in the defense of the Home Islands
(Hasegawa)
In the fall of 1944 the last of the 1,225 Ki-44 Shoki fighters was delivered to a home defense unit. By that point in the war, the Shoki was used primarily with reasonable success against the B-29 Superfortresses that were ranging all across the home islands. After the war, the Nationalist Chinese operated the Shoki against the Communists, who themselves had their own Shoki squadrons which were flown by Japanese mercenary pilots. The last Shokis used by the People's Liberation Army Air Force were retired in the early 1950s. No Shokis survived to this day, but a college in Xian, China, has a wing center section. 

Further reading:


Source: Air Enthusiast, Volume 3, Number 1 (July 1972), "Nakajima Demonology: The Story of the Shoki" by William Green, managing editor, Gordon Swanborough, editor. Pilot Press Ltd, 1972, p17-25.

14 April 2016

VFP-62 "Eyes of the Fleet" and the Bay of Pigs Invasion

Over the course of the Second World War, photoreconnaissance in the US Navy progressed from rudimentary handheld photography from whatever aircraft was available to reconnaissance variants of carrier fighters equipped with cameras in fuselage bays. The reconnaissance mission was carried out usually by the fighter squadrons in the carrier air wing (which were still called carrier air groups back then) and in the years after the war, small groups of combat-seasoned photo recon pilots were usually attached to carrier air groups but no standard training, syllabus or even squadron existed for the reconnaissance mission. That all began to change in 1948 when Fleet Air Service Squadron THEE formed a photographic detachment at NAS Norfolk, Virginia. On 8 January 1949, 13 officers and 88 enlisted personnel gathered to form Composite Squadron SIXTY-TWO (VC-62) at Norfolk, with a sister squadron, VC-61, formed on the West Coast at NAS Miramar, California, to serve the Pacific Fleet. The squadrons were tasked to train and perform the photo reconnaissance mission. The first aircraft of the units were photo variants of the Bearcat and Corsair- the Grumman F8F-2P (the P suffix designating a recon variant) and the Vought F4U-4P and -5P. Though specialized for the recon mission, that's a loosely used term since the aircraft carried a single camera in a fuselage bay and the pilots were still considered fighter pilots and VC-61 and VC-62's training regimen still required proficiency in gunnery, rocketry and bombing missions with extra emphasis on navigation. 

A VFP-62 F2H-2P Banshee aboard the USS Franklin D. Roosevelt
(Wikipedia)
Of the two squadrons, VC-62 would soon become famous. The unit was transferred from Norfolk to NAS Jacksonville and converted to the McDonnell F2H-2P Banshee which was a quantum leap in performance over the Bearcats and Corsairs as not only was the Banshee jet powered, but its extended nose bay housed multiple cameras that could photograph targets from over 40,000 feet. In 1953, VC-62 added the swept wing Grumman F9F-6P Cougar to its existing fleet of Banshees. Camera technology also progressed in this time to allow sharper and better quality photos from aircraft moving at much higher speeds than piston-engined aircraft. The arrival of the jets also meant that the pilots no longer had guns to shoot back- the recon variants of the jets were unarmed, requiring the use of speed, maneuverability and sharp mission planning to get home with the photos. On 2 July 1956, VC-62 was redesigned VFP-62 and VC-61 became VFP-63. Two years later, VFP-62 got one of the finest naval photo reconnaissance aircraft in the form of the Vought F8U-1P Crusader. 
A VFP-62 F9F-6P Cougar overflies the USS Essex
(Wikipedia)
The Crusader wasn't just fast, it also had the latest in state of the art camera technology in the -1P recon variant. At the speed of the Crusader, especially at low levels, the images would have been blurred, but the four cameras of the -1P Crusader had what was called IMC (Image Motion Compensation). A set of avionics boxes with controls in the cockpit coordinated the aircraft's speed and altitude with the camera equipment. During a photo run, a vacuum sucked the film frame against a moving shuttle- when the shutter opened, the shuttle would move the film frame in the opposite direction of flight at a speed that canceled out the forward speed of the Crusader for that brief moment. When the shutter closed, the vacuum released the film frame and the next frame entered the shuttle. This process took place with each of the Crusader's four cameras multiple times in a second depending upon the target, the aircraft's speed and altitude, and ambient lighting conditions. The IMC electronics also made sure the frames overlapped the ground to insure a required level of coverage of of the target. 

In 1958, the same year as the conversion to the F8U-1P Crusader, VFP-62 moved to NAS Cecil Field outside of Jacksonville as it had outgrown its Jacksonville base. It was an unusually large squadron compared to most Crusader fighter squadrons on account that it sent detachments of carrier air wings- a typical photo detachment might be three aircraft with 35 officers and enlisted men. The squadron could have multiple detachments deployed worldwide at any given moment. 

A VFP-62 F8U-1P Crusader tanks from an A4D-2 Skyhawk
(Wikipedia)
On 1 January 1959, the revolutionary forces of Fidel Castro defeated Fulgencio Batista's regime in Cuba, putting the island nation square in the communist sphere of influence. Needless to say, having a Soviet client state just 90 miles from American shores would greatly influence the foreign and defense policy of both the Eisenhower and Kennedy administrations. John F. Kennedy won the 1960 presidential elections against Richard Nixon on a strong anti-Castro platform, campaigning that Nixon, as Eisenhower's vice-president, was weak on Cuba. Unfortunately for Kennedy, this put him in a position after entering office of accepting the plan for the invasion of Cuba by US-trained Cuban exiles at a location called the Bay of Pigs. On 18 April 1961, a force of 1,400 Cuban exiles landed ashore at the Bay of Pigs as the Cuban Expeditionary Force (CEF) with plans to start a counter-revolution against Castro. Kennedy was keen to limit the appearance and extent of American involvement and the CIA-trained CEF force had its fleet of Douglas B-26 Invader aircraft cut in half as part of that effort. The young president wanted the CEF to look like a home grown force than a US-backed force to prevent a superpower confrontation. The operation was doomed from the start and when it became clear that the CEF was in over its head against Castro's forces the following day, Kennedy ordered a secret photo assessment of the situation on the ground at the Bay of Pigs. 

VFP-62 had three F8U-1Ps as part of Detachment 41 assigned to the USS Independence which was in the area for contingency operations should US air support be needed (which it was but was never authorized). Det 41's commander was ordered to paint over any military markings and even the maintenance stencils were overpainted in gray. Roman numerals I, II, and III, were painted inside the wheel wells to tell the aircraft apart as they were completely sanitized of any exterior markings. The Crusaders were identified as "Gray Ghost" and then "One", "Two", or "Three" during flight operations. They conducted a series of flights over the Bay of Pigs which confirmed that the CEF was about to be overrun by Castro's forces. It was hoped that the low level overflights of the area might give Castro's forces pause that the CEF might be defended by US airstrikes and give the beleaguered exiles time to regroup, but this wasn't to be the case and the CEF was roundly defeated with those not killed taken prisoner. 
A VFP-62 F8U-1P Crusader prepares to launch from the USS Independence
(Wikipedia)
The USS Independence and its carrier air wing were awarded the Armed Forces Expeditionary Medal for its clandestine operation, but even after the disaster at the Bay of Pigs had passed, VFP-62 was requested to remain in the area to keep an eye on Cuba. Up until the Cuban Missile Crisis in October 1962, the squadron would make periodic flights to Cuba, mostly staging out of NAS Cecil Field. Flights of two aircraft would then "pretend" to making practice approaches to NAS Key West and dash to Cuba at low level. Other missions had two Crusaders appear as a flight transiting to Guantanamo Bay and then dash down at low level before recovering at Homestead AFB in Florida. 

VFP-62's missions would soon take on added urgency as October 1962 approached. But that's a subject for a future article here at Tails Through Time! 

Further reading: 


Source: Blue Moon Over Cuba: Aerial Reconnaissance during the Cuban Missile Crisis by Capt. William B. Ecker USN and Kenneth V. Jack. Osprey Publishing, 2012, pp 33-50.

12 April 2016

CHECK SIX: Ships Sunk or Damaged by the Yokosuka MXY7 Ohka

Hasegawa model kit box art showing a G4M releasing an Ohka
(Hasegawa Models)
The Yokosuka MXY7 Ohka ("Cherry Blossom") kamikaze flying bomb was conceived by Ensign Mitsuo Ohta of the 405th Kokutai of the Imperial Japanese Navy. He was considering how to overcome the dense anti-aircraft defenses of Allied warships. His design solution, aided by students from the University of Tokyo, was for a rocket propelled kamikaze aircraft that would be flying too fast in its terminal approach to the target to be shot down. He submitted his ideas to the IJN for consideration and his proposals were refined further by engineers at the IJN's Yokosuka Naval Air Technical Arsenal which resulted in the MXY7 design which was essentially an anti shipping missile with a 2600 lb warhead with a kamikaze pilot as its guidance system. 

The Ohka had three rocket engines which could be ignited at once or in sequence. Dropped by the Mitsubishi G4M "Betty", the Ohka had a range of approximately 23 miles and had a terminal approach speed between 580-620 mph, significantly faster than piston engined kamikazes. 

The Yokosuka arsenal would build 155 Ohkas while the Kamisagura Air Arsenal would built over 600 Ohkas. It was planned to debut the Ohkas at the Battle of Leyte Gulf, but the ships transporting the Ohkas to the Philippines were sunk enroute. The Ohka's operational debut would be in the Battle of Okinawa with mixed results:

12 April 1945: USS Mannert L. Abele, destroyer, sunk by one, possibly two Ohkas.
12 April 1945: USS Jeffers, a destroyer converted to a minesweeper, damaged.
12 April 1945: USS Stanly, a destroyer, damaged.
4 May 1945: USS Gayety, a minesweeper, damaged.
4 May 1945: USS Shea, a light destroyer coverted to a minelayer, damaged.
11 May 1945: USS Hugh W. Hadley, a destroyer, damaged.

Interestingly, the captain of a support vessel who witnessed the sinking of the USS Mannert L. Abele had this to say: "It is difficult to say what it was that hit the DD 733. This officer personally saw what appeared to be two (2) planes orbiting in a northerly direction from the DD 733, and then suddenly, what appeared to be, one plane, accelerated at a terrific rate, too fast for us to fire at. This plane dove at an angle of approximately 30 degrees, starting at about four miles [7.5 km] away. Since we had no air search radar, the above statements are merely my own conclusions."

That captain's report was the first to indicate that the Ohka was operational. 

Further reading:


09 April 2016

The WW1 French Fighter That Got More Fame Than It Deserved: The Nieuport 28

Aviation author Peter Bowers once said of the Nieuport 28 biplane fighter of the First World War "The French Nieuport 28....is unique in aviation history for having achieved a considerable degree of fame that it didn't really deserve." The penultimate Nieuport biplane fighter design was rejected by the French for front line service and that might well have been the end of the story for not just the aircraft but the Nieuport company as well had it not been for the American Expeditionary Force's need for a fighter aircraft as the better SPAD biplane's production was devoted to filling the needs of the French Air Service. Since it was available, it would be the Nieuport 28's claim to fame to be the first combat aircraft to wear American colors into the First World War. 
This N.28 wears the "kicking mule" emblem of the 95th Aero Squadron. The kicking mule is still used by the 95th Reconnaissance Squadron that flies the Rivet Joint.
(USAF Museum)
The story of the Nieuport 28 (N.28C-1 was its company designation, but for brevity reasons I'll just refer to it here on out as the N.28) begins with the formation of an aircraft company by Edouard and Charles Nieuport in 1909, at first devoted to producing aircraft components like engine ignition systems. Both brothers were pilots and began working on their own monoplane designs which were contemporaries of the more famous Blériot XI design that made the first air crossing of the English Channel on 25 July 1909. After a series of prototype designs, the Nieuport brothers reorganized the company in 1911 to focus more on their own aircraft designs as Nieuport et Deplante. Edouard was killed while flying that year and with the help of aviation-minded investors, the company was renamed Société Anonyme des Établissements Nieuport with the remaining brother, Charles, heading the company before his untimely demise also while flying later that year. Swiss engineer Franz Schneider, who would become more famous for his German designs in the First World War, briefly held the post of chief designer at Nieuport until he left for Germany in 1913. French engineer Gustave Delage took over in January 1914 and began work on a sesquiplane racer- not a true biplane as the lower wing was much narrower than the top wing. For lightness, Delage used only a single spar in each wing and used a "V" brace for the wing struts, the apex of the "V" being on the lower "half" wing. By the time the First World War had broken out, Delage's racing aircraft design became the Nieuport 10 fighter which in turn was developed into the faster Nieuport 12 fighter. The V-strut and sesquiplane layout would be the pattern of a series of further developments of the Nieuport fighter over the course of the war. By 1917, the current design was the Nieuport 17- though light and maneuverable, it couldn't deal with the latest crop of German fighters as it was underarmed (it only had a single machine gun when twin guns were pretty much the air combat standard by that point) and the single spar sesquiplane structure wasn't strong enough for extended air combat with the latest German designs. It was painfully obvious that Gustave Delage's design layout had reached its limits. 

With the French Air Service considering the SPAD S.VII fighter, Delage set about to create a better Nieuport fighter and broke with his long-standing design tradition by adopting a true biplane layout with conventional two spar wings and a twin machine gun armament with the Nieuport 28. With a longer fuselage but keeping the same cross section, the N.28 looked sleeker than previous Nieuport designs. Both the upper and lower wings now had two spars for strength and the chord of the lower wing was slightly less than that of the upper wing with Delage abandoning his favored sesquiplane layout. In contrast to the angular wing tips of his previous designs, the N.28 had rounded elliptical wingtips with conventional two strut wing braces attached to the spars, again, breaking with the V-strut configuration of his past designs (which were sometimes referred to as "V-Strutters"). Because of the narrowness of the fuselage, the twin Vickers 0.303 machine guns were offset- one left of center ahead of the pilot and the other nearly on left fuselage side. This was the result of the original N.28 prototype having only a single gun offset to the left ahead of the pilot. The need for a second gun meant that the fuselage was too narrow for two guns side by side ahead of the pilot, the second gun was offset to the left and below of first gun. 

Eddie Rickenbacker and his N.28. Note the offset guns and the Hat-in-the-Ring emblem
still used to this day by the 94th Fighter Squadron which flies F-22s from Langley AFB.
(Wikipedia)
In keeping with past Nieuport designs, a rotary engine was used from either the Gnome or Le Rhone engine manufacturer. To keep the engines lightweight, they lacked carburetors and could not be throttled down- as a result, the N.28 had what was called a "blip switch" on the control stick that would briefly turn off the engine when power needed to be reduced, such as landing. The Le Rhone rotary engines were a bit more flexible and could be throttled between 900 to 1250 rpm, but even at the lowest setting it was still too much power for the N.28, so the "blip switch" was still necessary regardless of the engine type installed. Later engines would feature additional switches that could cut out certain cylinders on the engines to reduce power, but these systems would prove to be continual maintenance headaches. The late model Gnome engines boasted 100 hp which for the N.28 was a lot of power, but to keep engine weight down, the engine cylinders had only a single valve instead of the traditional two valves and as such, were referred to as "Monosoupape" engines which worked not unlike a two stroke engine. Unfortunately this was very wasteful when it come to fuel consumption and incompletely burned fuel posted a constant engine fire hazard for N.28 pilots. 

While the engine issues alone might have been enough cause for the French Air Service to reject the N.28, the performance gains offered were eclipsed by the SPAD S.XIII which became the standard French fighter of the period. That might have been the end of the Nieuport story at that point had it not been for the arrival of the American Expeditionary Force in France. Lacking a suitable fighter aircraft of their own, the Americans turned to the French for the SPAD S.XIII, but all of SPAD's production was committed to French needs and none were available for the AEF. The French offered the N.28 which wasn't ideal but it was better than nothing and Nieuport would build 297 N.28s for the AEF. 

The introduction into service was lackluster at best. The First Pursuit Group assigned the N.28 to four of its squadrons- the 27th, 94th, 95th, and 147th Aero Squadrons. The 95th AS arrived first to the front in February 1918, but the N.28s were delivered without guns! To boost morale and show that that the Americans were ready for action, Major Raoul Lufbery, a veteran of the Lafayette Escadrille of American volunteers, led unarmed patrols over the front lines the following month. It was an inauspicious start to American air combat operations that the first fighters in action lacked armament. On 14 April 1918, the 94th's sister squadron, the 95th Aero Squadron, made its first armed patrol with three N.28s- with the flight lead aborting due to weather, the other two pilots, Lt. Reed Chambers and Lt. Eddie Rickenbacker, decided to press on with their patrol. Returning to the airfield, two German fighters were overhead, apparently lost above the fog. The second patrol launched with Lt. Alan Winslow and Lt. Douglas Campbell and they downed the two Germans, Winslow scoring the first victory for the AEF and Campbell (soon to become the first American ace) getting credit for the second German by forcing it to crash land.

In the weeks of air combat that followed, the Americans found the N.28 had other short comings besides its troublesome rotary engine. During extended dives, the upper wings tended to shed their fabric covering, often taking the wing ribs forward of the forward wing spar with it. Several American pilots were lost due to the wing failures. Even Eddie Rickenbacker nursed home a crippled N.28 when he lost most of his upper wing's fabric. By the time Nieuport had a fix for the problem, adequate SPAD S.XIIIs became available and the Americans quickly converted to the superior SPAD fighter in July 1918. After the last N.28s were built for the AEF squadrons, Nieuport switched over to license production of SPAD fighters in an ironic twist. By August 1918, the last N.28s were phased out from the AEF in favor of the SPAD. 

Despite the shortcomings of the N.28, the Americans maintained a favorable win-to-loss ratio, the most appreciated quality of the N.28 being its maneuverability. The kill ratio was about 3:1, respectable given the shortcomings of the N.28 and the relative inexperience of the American pilots early on. By the time the four squadrons had converted to the SPAD, the kill ratio had slipped to 1:1 on account of there being more veteran German pilots in combat than earlier in the N.28's combat career. 
An N.28 flies off the turret platform of either the USS Oklahoma or USS Pennsylvania
(US Navy)
Following the First World War, about 50 N.28s that did not see combat service over France were shipped to the United States and used by the US Navy as gunnery observation aircraft. Small fly-off platforms were built atop some battleship turrets and the light weight and rapid acceleration of the N.28 allowed them to be operated off these platforms. Flotation gear and hydrovanes were fitted that allowed the N.28s to be recovered from water landings. 

Further reading: 


Sources: Profile Publications No. 79: The Nieuport N.28C-1 by Peter Bowers. Profile Publications, 1966. National Museum of the US Air Force, Wikipedia. 

07 April 2016

CHECK SIX: Trans World Airlines Goes All-Jet


As the sun rose on 7 April 1967, history was made as TWA became first US airline to go all pure-jet, having retired its Constellations and Starliners the night prior. The last TWA passenger Connie service was Flight 249 JFK-Philadelphia-Pittsburgh-Columbus-Louisville-St. Louis. The next day the last one flew to storage in Kansas City where there were 35 other Super Constellations and Starliners awaiting their fate. The night of 6 April, ground service crews put a booklet in all the seat back pockets of the TWA passenger aircraft titled "Props Are For Boats". 

The introduction of the Boeing 727 and Douglas DC-9 accelerated the Constellation retirement which by the 1960s were relegated to short haul domestic routes and some cargo flying. Two Connies soldiered on after 7 April on cargo-only duties, though. From the introduction of the Lockheed Constellation with TWA's dramatic 1944 delivery flight to Washington flown by Howard Hughes to its retirement to the 1967 retirement from passenger service, the Constellation family served TWA for 23 years with over 140 examples. 

Within two years, by 1969, Trans World Airlines had surpassed the iconic Pan American in the number of passengers carried across the Atlantic. 

Further reading: 


(Photo: FlyerTalk Forums)

06 April 2016

CHECK SIX: The 1937 Kamikaze Flight That Didn't End with a Fiery Crash

"CHECK SIX" is new little feature I'm going to be introducing here and there here at Tails Through Time as a little filler in-between my primary articles. The name for this feature is because they're going to be quick looks back in aviation history that don't necessarily warrant my more in-depth articles. The titles for these short tidbits will always start off with "CHECK SIX". 


This particular Mitsubishi Ki-15 with the registration J-BAAI was the first Japanese aircraft to fly to Europe when it left Tokyo on this day (April 6) in 1937 for a oodwill flight to London Croydon Airport. Sponsored by the Asahi Shimbun newspaper as part of the celebrations for the coronation of King George VI, the plane was named "Kamikaze-go" and flew Tokyo-Taipei-Hanoi-Vientiane-Calcutta-Karachi-Basra-Baghdad-Athens-Rome-Paris-London. The pilot, Masaaki Iinuma, was only 26 at the time and both he and his navigator, Kenji Tsukagoshi, were awarded the Legion of Honor by the French. 

Total elapsed time from departure in Tokyo was 94 hours, of which 51 hours were actual flying time. Iinuma later served as a test pilot in Japan and was killed in action in December 1941 in Cambodia. The navigator, Tsukagoshi, was on the Tachikawa Ki-77 prototype when it set of for a flight to Germany from Singapore in 1943, but the Ki-77 disappeared over the Indian Ocean. 

The Japanese classical music composer Hisato Ohzawa wrote the Piano Concerto No.3 "Kamikaze" in honor of this record breaking flight. If you're a fan of the composer Sergei Prokofiev, Ohzawa's work is in that Impressionistic style. 

(Photo: Wikipedia)

08 March 2016

The Ryan FR-1 Fireball and F2R Dark Shark: An Evolutionary Dead-End

When the US Navy initiated the development of its first jet fighter, the McDonnell FD-1/FH-1 Phantom, in 1942, not only did it hedge its bets on McDonnell's design by carrier testing the Lockheed P-80 Shooting Star, but it also initiated a back up program at the insistence of the Navy's Bureau of Aeronautics (BuAer) for a mixed-powerplant fighter that combined a conventional piston radial engine with a jet engine. There were still a lot of unknowns about the operation of jet aircraft from fleet carriers and the concept of a mixed powerplant fighter would combine what was known- that a conventional radial engine had the performance for a carrier takeoff and a wave-off from landing and that a jet engine could provide a boost for high speed performance. At the same time as the start of the FD-1/FH-1 program, BuAer held a competition for a mixed-powerplant fighter which was won by San Diego-based Ryan Aeronautical Corporation which started work in 1943 on the prototype for the FR-1 Fireball.

Ryan FR-1 Fireball
(Wikipedia)
The Fireball's radial engine was a Wright R-1820 Cyclone 9-cylinder radial engine generating 1,425 horsepower. The R-1820 was used on a variety of World War 2 aircraft from the Boeing B-17 Flying Fortress to the Douglas SBD Dauntless and Curtiss SB2C Helldiver. This was a surprising choice given that the standard engine of the Navy fighters of the day was the 2,000 horsepower Pratt & Whitney R-2800 18-cylinder Double Wasp. The jet engine in the rear fuselage, fed by wing root intakes, was a General Electric I-16 (later redesignated J31) developing approximately 1,600 lbs of thrust. The I-16/J31 was a GE production version of the Whittle W.1 centrifugal flow turbojet and was the first production jet engine built in the United States. Outside of the Fireball, two of the same jet engine were used on the Bell P-59 Airacomet. Development of the three prototype XFR-1 airframes proceeded along remarkably smoothly and the prototype made its first flight on 25 June 1944 powered only by its piston engine. On the third flight, the I-16 engine was fitted to the prototype and used successfully.

The Fireball boasted excellent cockpit visibility but one of its other unique features was it was the first production carrier-borne aircraft to have a tricycle landing gear. This was done primarily out of necessity to elevate the jet engine exhaust up and away from the wooden decks of the Navy's fleet carriers. Despite the loss of the three prototypes, the Navy was anxious to field the FR-1 Fireball and had already ordered 100 aircraft a year before the first flight of the prototype. With satisfactory flight testing and excellent performance, another 600 aircraft were added to the order in 1944. The Navy wanted the Fireballs in the Pacific as a Kamikaze interceptor- Fireballs were planned to be used in combat air patrols, loitering on their radial engines. When inbound Kamikazes were detected on radar, the Fireballs would light up the jet engine and speed off to intercept the enemy. At the end of 1944, the Navy ordered 600 of a faster variant, the FR-2, that had a more powerful R-1820 engine that developed 1,500 horsepower. 

VF-66 Fireballs in formation flight
(San Diego Air & Space Museum Archives)
Navy fighter squadron VF-66 stood up at NAS North Island where the Ryan plant was located to speed the introduction into service of the Fireball. Instead of the usual operational evaluations and demonstrations, VF-66 was tasked to get the Fireball into action as soon as possible. Unusual for a Navy squadron of the day, VF-66 was made up of senior officers and experienced pilots. Five days after VF-66 stood up on New Year's Day 1945, the first FR-1s were making their initial carrier qualifications aboard the USS Ranger in preparation for combat deployment. The squadron pilots enjoyed flying the FR-1 for its speed and maneuverability. Pilots often would make low passes at area airfields with the front prop feathered to confuse tower and airport personnel. By July 1945 VF-66 was in final preparations to take the FR-1 into combat but it was all for naught when the Pacific War ended the following month with surrender of Japan after the atomic bombings of Hiroshima and Nagasaki. The Fireball was officially unveiled to the public in September 1945 but only 66 FR-1s were produced and delivered before the war ended, the balance of orders for the FR-1 and FR-2 being canceled. After the war in November 1945 a Fireball that suffered a radial engine failure landed on the USS Wake Island to be come the first jet landing on an aircraft carrier, but obviously not intentionally!

Looking to improve the Fireball's performance, Ryan proposed the FR-3 that would have taken the faster FR-2 design and swapped out the I-16 engine for a more powerful GE I-20 engine that offered 2,000 lbs of thrust. The FR-3 never got built, but Ryan did a contract for a prototype of the FR-4, which used a 3,400-lb thrust Westinghouse J34 engine in the rear fuselage. The XFR-4 did fly, and the main external difference was the relocation of the jet intakes from the wing roots to the lower sides of the nose just aft of the radial engine. Doors could close off the NACA-style flush intakes to keep the jet engine from windmilling and producing drag and small eyelid doors could increase the area of the intake as well. The XFR-4 added 100 mph to the top speed of the Fireball, but only one prototype was built. The small number of FR-1s, however, were withdrawn from service when in 1947 they were found to have significant structural fatigue in the aft fuselage just behind the wings. The last flyable FR-1 arrived at the Naval Air Technical Training Center in Memphis, Tennessee, to be used as a maintenance trainer.

Ryan F2R Dark Shark configuration
(San Diego Air & Space Museum Archives)
It wasn't the end of the road for the Fireball just yet, though. The Powerplant Division of BuAer still remained skeptical of the performance of jets in the carrier landing pattern. Ryan was asked to further develop the FR-1design by replacing the radial engine with a General Electric 1,700-horsepower XT31 turboprop engine. The XT31 was the first turboprop engine designed and built in the United States and was also used on the Air Force's Convair XP-81 turboprop/jet fighter. The new Ryan fighter was designated the F2R Dark Shark and though it retained the wing root intakes and the I-16/J31 engine of the FR-1, it had an impressive climb rate but lacking the drag-reducing jet intakes of the FR-4, it was actually slower than the XFR-4 in level flight. With the large 8-foot prop, the Dark Shark demonstrated improved performance in the carrier landing pattern over the FR-1, but by the time of its first flight in November 1946 McDonnell had proven the practicality of pure-jet carrier operations with the FD-1/FH-1 Phantom and the last resistance within BuAer to pure jets had ended as the Navy decreed that all future fighters after the Grumman F8F Bearcat would be pure jets.

The Dark Shark in flight
(San Diego Air & Space Museum Archives)
The Air Force (then still the USAAF) was impressed with the performance of the XF2R-1 Dark Shark prototype and asked Ryan to make some modifications to evaluate it in competition against the Convair XP-81. What was designated the XF2R-2 featured the NACA flush intakes on the nose of the XFR-4 feeding a Westinghouse J34 engine. The XF2R-2 was ultimately never built other than as a mockup, as the Air Force decided, like the Navy, that mixed powerplant fighters were an evolutionary dead end and the future lay with pure jets.

I should also mention the Curtiss XF15C which was also planned as a Navy mixed-propulsion fighter. But that aircraft will be getting its own article at a later date here at Tails Through Time!

Further reading: 

The Coming Kamikaze Threat in World War II We Never Faced
Refining Anti-Submarine Warfare: The Grumman AF Guardian
The Ground-Breaking Gun Turret of the Grumman TBF Avenger
The Boeing PBB Sea Ranger: The Best Flying Boat at the Worst Possible Time

Source: U.S. Naval Air Superiority- Developement of Shipborne Jet Fighters 1943-1962 by Tommy H. Thompson. Specialty Press, 2008, p28-30.

03 March 2016

A Cat of a Different Sort: The Grumman Ag-Cat

Crop dusting expanded considerably after the Second World War with a surplus of pilots, aircraft and engines. Most crop dusting operations used the Boeing/Stearman Kaydet training biplane as it was rugged to deal with the ham fisted flying of students and it was cheap being war surplus as the US military modernized its training fleets in the postwar period. Though plentiful and relatively easy to maintain, a fully loaded Stearman for crop dusting was in most cases underpowered. One of the qualities that made the aircraft so ideal for training was that it required a lot of coordination to minimize its yaw tendencies. It wasn't unusual for a Stearman student to find operational combat aircraft less demanding to fly! That's not to say it was a difficult aircraft in the training environment, but if you were to add a heavy load of chemicals and associated spray equipment, then the Stearman was definitely a handful for crop duster pilots who were flying just a few feet above the ground and then having to climb to avoid treelines and whatever obstacles surrounded most agricultural fields. In 1956, two members of Grumman Aircraft's preliminary design group, Joe Lippert and Arthur Koch, had been touring the Gulf Coast talking to oil industry executives and operators on their requirements for proposed amphibian they were considering. They had a second aircraft in mind as well, a purpose-built crop duster, but the amphibian was their priority at the time of their visit to the Gulf Coast. What Lippert and Koch found was that there was a broad range of needs by the oil industry that they weren't sure a single design could meet all the demands they discussed with prospective customers. Shelving the amphibian project, they then visited farming communities and observed crop dusting operations with considerable interest. Discussions with crop duster pilots revealed some of the problems pilots faced with the near-ubiquitous Stearmans that were the bulk of the crop dusting fleet of the day. While Grumman was not alone in its considerations of a custom-designed crop dusting aircraft, they certainly chose a different design philosophy than other aircraft manufacturers like Piper and Cessna took in their crop dusting designs. 

The Smithsonian's Gruman Ag-Cat
(NASM Udvar-Hazy Center)
Lippert in particular was fascinated with how crop duster operations were getting war surplus radial engines for only $25 to replace the existing worn out Continental R-670 seven-cylinder radial engines for their Stearmans. He astutely realized that the best approach for Grumman was a design that used the 220-hp radial engine as they were inexpensive and plentiful on the aftermarket. This would make acquisitions costs more reasonable and potential owners and operators already had experience operating and maintaining the R-670 engine. Lippert and Koch went back to Leroy Grumman and presented their preliminary specification for what would become the Grumman Ag-Cat. However, Grumman was tied up with a lot of military business in the later half of the 1950s and Grumman told the two men that the new project would have to carried out on a shoestring budget. An empty hangar was secured as a workshop and design space along with tooling that was to be scrapped that they thought might be of use. The entire engineering team for the aircraft consisted of only eight people, two of which were Joe Lippert and Arthur Koch. They borrowed craftsmen from the production floor as needed based on who was available- most of these craftsmen were on the verge of retirement but their skills dating back from the 1920s and 1930s would prove valuable to the Lippert and Koch. While the number of craftsmen working varied based on who was available, it usually averaged about thirty individuals. With the craftsmen working right next to the engineers and draftsmen, a tight-knit group that hearkened back to the Grumman's early days formed. 

Unusually for an aircraft program, the design and build of the Ag-Cat began simultaneously on 30 October 1956. Some of the workers came in on weekends and evenings on their own time to help with the project- after all, the last Grumman biplane was the F3F from the 1930s, so there was considerable interest among the "old hands" at Grumman in the Ag-Cat project (which had yet to get the Ag-Cat name at the time). The fuselage mock up was built in Joe Lippert's garage much to his wife's consternation. Ideas from the mock up then went to the hangar in the morning for incorporation in the aircraft as it came together. To keep things simple, a welded tube fuselage was used with removable aluminum panels to allow the interior to be washed out of any chemical residue from crop dusting. The two wings were staggered with the lower wing 35% aft of the top wing to give the aircraft very benign stall characteristics. This way one wing stalled before the other which insured the pilot would always have some level of control in a stall situation. The four wing panels- left and right top and bottom wings, were all interchangeable which eased maintenance and production costs. The aileron on a top wing panel became a flap if that wing panel were used on the lower wing. The nose sloped downward to improve the pilot's vision during low level flying and the airspeed indicator and engine tachometer were put right at the pilot's eye level to avoid having to look down at the instrument panel. The fuselage structure around the cockpit was designed to absorb a 40G crash- given that 10% of crop duster pilots crashed each year of their careers, making the aircraft survivable in the event of a crash was to be a prime selling point- in fact, from the first delivery in 1959, nine years elapsed before the first Ag-Cat crash. The chemical hopper was installed in the fuselage ahead of the cockpit right at the center of gravity to prevent there being any shifts in the center of gravity as the load was expended. The hopper had a 217 gallon capacity for liquids or 1,200 lbs for dry product. The price was established at $12,995 without the engine and propeller, $13,995 if a power plant package was factory installed. 

N10291, the Grumman Ag-Cat prototype
(Wikipedia/Rene Francillon Collection)
The first flight took place on 27 May 1957, just seven months after design/fabrication of the prototype, N10291, began! Lippert and Koch requested that all the workers who worked on the project bring their wives to the first flight- as many of them had worked additional hours on top of their existing jobs on the project, they thought that the wives should see "the other woman" in their husbands' lives!

With a successful first flight that revealed no major issues, the second prototype joined the test program a month later. Grumman himself invited crop duster pilots from around the country to try out the prototypes and every single one was enthusiastic about the aircraft's handing and tight turning capability given that most crop duster pilots that stalled did so during turns to make another pass. The two prototypes were then taken on a nationwide tour by Lippert and Koch with over 150 pilots trying out the aircraft. One of the crop duster pilots that tried out the aircraft, Dick Reade, suggested the name Ag-Cat to the Grumman team as it was in line with Grumman's naming of its fighter aircraft with feline names (Dick Reade's name is below the cockpit of the Ag-Cat on display at the National Air & Space Museum's Udvar-Hazy Center). While on tour in Texas, Joe Lippert began to take flying lessons and on the day he earned his pilot's license, the first thing he did was try out the Ag-Cat- one of those few occasions where an aircraft's designer got to fly their own aircraft- common in the early days, but increasingly rare as aircraft grew in complexity and performance. 

Leroy Grumman had planned on building the Ag-Cat at the Bethpage facility on Long Island in the event that military sales slowed, but this wasn't to be the case and space was lacking for the production of the Ag-Cat. Grumman had the entire production sub-contracted to Schweizer Aircraft in Elmira, New York, who had the production space and the experience in building welded tube aircraft from their long line of gliders. The first production Ag-Cat was delivered in 1959- Schweizer would build 1,730 Ag-Cats from Grumman until 1980. In 1981, Schweizer purchased the design rights outright from Gulfstream (which was the spin off of Grumman's civilian aircraft business) and would build another 617 Ag-Cats until production ended in 1995. Over its production life, more powerful engines and even turbine power was offered which allowed even greater load carrying capability. In 1995, the Ag-Cat Corporation of Missouri purchased the design rights from Schweizer and a further five Ag-Cats were built before they went bankrupt. A large Ag-Cat operator in Arkansas then bought the design, but I haven't been able to determine who currently holds the design rights to one of the most iconic agricultural aircraft. I did come across an online article from 2011 in the Columbus Telegram in Nebraska about an individual named Jared Storm who owned an agricultural flying service and was in negotiations at the time about relaunching Ag-Cat production at David City Municipal Airport in Nebraska (93Y), but haven't found anything further from that news item. If any of my readers has any information, please do add it in the comments section of this article. 

Further reading: 


Sources: Ironworks: The Story of Grumman and Its Aircraft by Terry Treadwell. Tempus Publishing, 2000, pp 160-164. The Smithsonian National Air & Space Museum's entry on the Ag-Cat (http://airandspace.si.edu/collections/artifact.cfm?object=nasm_A20080395000). 

27 February 2016

Hans von Seeckt and the Doctrinal Foundations of the Luftwaffe, Part One

With the defeat of Germany in the First World War, probably the harshest restrictions by the provisions of the Versailles Treaty dealt with Germany's military aviation, a reflection of the effectiveness of the Imperial German Air Force, the Luftstreitkräfte, during the latter half of the war. Four articles of the Treaty specifically addressed aviation in the postwar Germany. The Allies required the defeated Germans to surrender large quantities of aviation assets, including 17,000 aircraft and engines. Any sort of air force was strictly forbidden and the Germany aviation industry was shut down for a period of six months following the Treaty going into effect. No aircraft, engines or parts could be imported during that six month period and once that period had expired, Germany could only build aircraft that were of limited range, speed and engine power. Finally, the Germans had to surrender control of their airspace with the Allies having free overflight and landing rights throughout Germany. With the German government accepting the Versailles Treaty on 23 June 1919, the demobilization of the Luftstreitkräfte began with the official disbandment taking place on 8 May 1920. Along with effectively stripping Germany of an air force, the Treaty also placed strict limits on the size of the German Army and Navy, with only a lightly armed 100,000 man army with no tanks or heavy artillery and a 15,000 man Navy with obsolete ships and small patrol craft. The Navy was forbidden to have submarines or aircraft. To ensure compliance with the harsh measures of the Treaty, the Inter-Allied Control Commission was established with broad authority to inspect any military or industrial facility on short notice. 
General Hans von Seeckt
(Bundesarchiv.de)
Leading this diminished military force was probably one of the most under-rated military theorists of the Twentieth Century, General Hans von Seeckt. Descended from a line of noble Prussian military officers, from an early age von Seeckt had shown promise, vitality and vision and he rapidly moved up the ranks into the German general staff (the leadership of the Imperial German Army). He led German forces in the 1915 Serbian campaign and then led a very innovative mobile campaign in 1916 that pushed Romania out of the war. As chief of staff of the Ottoman field armies in Turkey in 1918, he showed a remarkable grasp of the strategic picture of war as he commanded a coalition of armies of varying strengths and weakness, successfully able to use the diverse forces at his disposal to carry out a war of maneuver against the largely static mass armies of Russia. Unlike many German generals, von Seeckt was highly educated outside of military matters, was fluent in English and French and also knew Latin and Greek. Prior to his service in the First World War, he had traveled extensively in Europe and as far as India. As the commander in chief of the interwar Germany army, the Reichswehr, he was even fond of having breakfast with the publishers and editors of several Berlin newspapers. 

What made Hans von Seeckt unique in comparison to his peers in Britain, France and the United States, was his vision that the next war would be a war of mobility and maneuver with smaller, more highly trained agile forces than with large mass armies. Many military thinkers of the day framed future wars through the lens of their recent First World War experience while von Seeckt felt strongly that the paradigm of war would change with technology, transforming the waging of war. As early as 1919 he was already advocating an all-volunteer military, feeling conscription belonged to a past era of slow, lumbering mass armies on the field. Mass armies were only suitable for defense and von Seeckt saw the only use for conscription for a reserve militia force. As many military theorists in France began to think more defensively (hence the Maginot Line), von Seeckt saw a mobile offense as the key in any future conflict. 

Captain Helmuth Wilberg
(Bundesarchiv.de)
Core to his ideas of maneuver warfare was the need for a fully independent air force that did more than just support the army- an idea that was pervasive in the United States at the time in particular given the apathy of the Army Air Corps towards long range bombing. As the head of the postwar Reichswehr in 1919, von Seeckt saw to it that what would be come the Luftwaffe got funding priority. As his air advisor, von Seeckt selected Captain Helmuth Wilberg, one of Germany's first aviators who had commanded over 700 aircraft in the field during the First World War. Wilberg was an unusual choice given that he didn't have the Prussian military background most in the Reichswehr expected. His father was an artist and his mother was Jewish- given that anti-Semitism in Germany had roots that went back well before the rise of the Nazi regime, Wilberg's family enjoyed a privileged status as his father had given art lessons to the daughter of the Kaiser. With the patronage of the Kaiser's family, Wilberg entered the military and began a successful career as a military officer. He even did a two year stint as the military tutor to some of the Kaiser's family members before joining the German general staff. In 1910, Wilberg became the 26th licensed pilot in Germany and became an ardent supporter of aviation development in prewar Germany. During the First World War, Wilberg gained renown as a unit commander for his analytical leadership style. 

With von Seeckt as the head of the Reichswehr (the term was used interchangeably for both the entire inter-war Germany military and for the Germany army of the time), he made Wilberg the senior officer in charge of all air matters- while Germany was forbidden by treaty to have an air force, in effect, Wilberg was the head of what would become the Luftwaffe. With Wilberg in charge of aviation, von Seeckt reorganized the German military with a particular emphasis on aviation. Since the Germany military was restricted in size, this gave von Seeckt a chance to pick the best and brightest of the war veterans who wished to continue serving in the military. The two men set about creating the plans for a future German air force that operated on von Seeckt's ideas on the employment of air power. 

General von Seeckt saw a fully independent air force as an offensive weapon in its own right- it's first task was air superiority- to control the air allowed for unhindered movement of his mobile army forces. Once control of the air was secured, then the air force would move in concert with mobile land forces to disrupt the enemy's ability to mobilize and supply its own forces. His own words still resonate in air power doctrines to this day: 

"The war will begin with a simultaneous attack of the air fleets- the weapon which is the most prepared and fastest means of attacking the enemy. Their enemy is, however, not the major cities or  industrial power, but the enemy air force. Only after its suppression can the offensive arm be directed against other targets."

This contrasts strongly with the strategic bombing doctrines of the same period that were being espoused with growing enthusiasm in Great Britain and the United States. Doctrinal theory that would later influence Allied strategic bombing plans in the Second World War saw the enemy's center of power as the cities and their industries whereas while von Seeckt did see that morale could be affected by attacking the enemy's cities, he saw the primary target of his air force the enemy's military, its air force in particular. Though he never ruled out bombing of enemy cities, he certainly foresaw that any future adversary would target German cities and he vigorously pushed the German government to establish a national system of civil defense. 

"Through aerial attack, one has the possibility of striking the centers of resistance of the enemy state Not a new target, but one more easily reached by air, are the key elements of military strength, whose disruption degrades the land army's powers of endurance. The only difference is that, when before the decision was sought on land and sea, now it is also sought in the air."

Within the newly formed Reichswehr, what was once the general staff (headquarters command) became the "Truppenamt" or "Troops Office", with von Seeckt as the chief of the Truppenamt. There were four sections in the Truppenamt- T-1 (Operations and Planning), T-2 (Army Organization), T-3 (Intelligence), and T-4 (Training). Only sixty officers were selected for the Truppenamt, giving an indication to the draconian restrictions on the Reichswehr. Acting as adjutants to the Truppenamt were what were called Inspectorates which were specialized staffs that established doctrine, training, and requirements for specific army units. These branch inspectorates focused on things like artillery, infantry, communications, medical corps, and so on. In addition, there was a mixed military and civilian staff group called the Waffenamt or Weapons Office. It was the Waffenamt's responsibility to develop, procure, and test weapons for the military. Many other military organizations in other nations had similar groups, but only in Germany were these functions centralized under one command- that of Hans von Seeckt. 

There was a fifth Truppenamt section that was in many ways the most important and it was designated TA(L). This was the air staff office with Helmuth Wilberg in charge. Wilbert made sure there were aviators in every section of the Truppenamt- of the sixty officers that made up the Truppenamt in 1920, six of them were aviators. Of the sixty officers assigned to the Waffenamt, six there as well were aviators. An even larger number former military aviators were employed as civilian staff to the different groups, insuring there was sufficient "air mindedness" in literally every corner of the Reichswehr. To foster an "air mindedness" throughout the rest of Germany within the restrictions of the Versailles Treaty, von Seeckt encouraged the sport of gliding throughout the Germany with the establishment of glider clubs which created a pool of potential pilots for the future Luftwaffe. Glider competitions were hosted by von Seeckt himself would award prizes for proficiency and skill in the air. 

Institutionalizing such "air mindedness" in the German military was unprecedented when compared with the military leadership structures of other nations. But simply having aviators on staff everywhere isn't enough. In the upcoming second part of this article, I'll talk more about what all those aviation staffers did in a systematic way that established the doctrinal foundations of the Second World War Luftwaffe that made it such an effective weapon in the first several years of the war. Stay tuned!

Further reading: 


Source: The Luftwaffe: Creating the Operational Air War, 1918-1940 by James S. Corum. University of Kansas Press, 1997, pp 49-59.