translate

Showing posts with label A)P-39. Show all posts
Showing posts with label A)P-39. Show all posts

Friday, May 17, 2013

CAF-Centex Bell P-39 earned its place in history

How the Bell P-39 helped turn the tide of battle in Russia, England and Europe.

The important utilization of The over 7,900 P-39s by the Soviet Air Force in WWII.

The Lend-Lease Act of 1941-helped Russia fight the Germans even before the United States entered WWII.
Link to quick overview of only regularly flying P-39 in the world.
President Roosevelt signed the Lend-Lease Act with the Allies in March 1941. The Alaska-Siberia Lend-Lease was conceived, partially, as a way to avoid shipping war equipment through the range of Axis submarines in the Pacific Ocean. Between 1942 and 1945, the program shuttled supplies and almost 8,000 aircraft from Great Falls, Mont., through Canada and Alaska, to the Soviet Union.
U.S. pilots would shuttle planes from Great Falls to Ladd Field (Fort Wainwright) in Fairbanks. Soviet pilots flew the planes to Galena and Nome, and across the Bering Sea to the Soviet Union. At the peak of the Lend-Lease program, according to the Alaska-Siberia Research Center's Web site, there were roughly 600 Soviet pilots and crew members at Ladd Field.

The WASP's played large role as ferry pilots in Lend-Lease transport.
A WASP pilot in front of a P-63, the P-39's updated model.

Air Transport Command ferry pilots, including U.S. women pilots of the WASP program, picked up the planes at the Bell factory at Niagara Falls, New York, and flew them to Great Falls, Montana and then onward via the Northwest Staging Route through Canada to Alaska, where Russian ferry pilots, many of them women, would take delivery of the aircraft at Nome [12] and fly them to the Soviet Union over the Bering Strait via the Alaska-Siberia route (ALSIB).
Recent memorial sculpture has P-39 a central element.
The recently completed Alaska-Siberia Lend-Lease Memorial, is situated along the Chena River in downtown Fairbanks. The project was funded by the federal and state governments, as well as the Juneau-based Alaska-Siberia Research Project. 
"The Alaska-Siberia Lend-Lease program is not about a battlefield," said Alexander Dolitsky, chairman of the center. "It's not about military strategy. It is about common people doing the work, doing the job during the war and helping soldiers and generals in the front line to win the war."

This vintage 1940 newsreel shows The RAF deploying the P-39's against the Germans. 
Great actual newsreel. worth watching! In 1940, the British were desperate for combat aircraft and were willing to consider just about anything that had wings, irrespective of how poor its performance might be. Consequently, when Bell submitted specifications to the British Direct Purchase Commission for a fighter with a top speed of 400 mph, a ceiling of 36,000 feet, and a range of 1000 miles, the Commission literally salivated on the spot and ordered 675 Bell Model 14s sight unseen on April 13, 1940. (2 minutes)

The Bell P-39, powerful armament and a very capable flying machine.

Our P-39 the"Miss Connie"
The Bell P-39 Airacobra was a United States fighter aircraft developed by Bell in World War II. Although the aircraft was not accepted for combat use by the United States Army Air Forces, it was successfully adopted by the Soviet Air Force.
Designed by Bell Aircraft, it had an innovative layout, with the engine installed in the center fuselage, behind the pilot, and driving a tractor propeller via a long shaft. It was also the first fighter fitted with a tricycle undercarriage.[5] Although its mid-engine placement was innovative, the P-39 design was handicapped by the absence of an efficient turbo-supercharger, limiting it to low-altitude work. Together with the derivative P-63 Kingcobra, the P-39 was one of the most successful fixed-wing aircraft manufactured by Bell.

The amazing story of the 7,983 P-39 delivered to the Soviets in Alaska as part of the 1941 Lend-Lease Act.

 P-63s, the P-39's updated model line up at a WWII Soviet Airfield.
With the outbreak of war, American lines of communication with Alaska by sea were seriously threatened and alternative routes had to be opened. The string of airports through the lonely tundra and forests of northwest Canada provided an air route to Alaska which was practically invulnerable to attack, and it seemed to be in the best interests of international defense to develop them and open a highway which would at once be a service road for the airports and a means for transporting essential supplies to the Alaskan outposts. In response to this need, United States Army engaged in the Alaskan Highway project.[1]
Neither the Eleventh Air Force and United States Army military installations could wait for the Alaska Highway to be completed. Nor could Lend-Lease aid to the Soviet Union. The long route though the Caribbean to Brazil and across Africa to Iran was unworkable, nor could aircraft be flown via Greenland or Iceland. A huge program of airport construction and road making, therefore, was undertaken.
Two routes were developed from the United States, which met at Edmonton, Alberta, from which the aircraft were ferried to Ladd Field, near Fairbanks, Alaska where the American-built aircraft were to be turned over to Russian flight crews. Marks Army Airfield, near Nome, Alaska was 500 miles closer to Russia, but was ruled out because the United States feared it was too vulnerable to Japanese attack. One route originated at Great Falls Army Air Base, Montana, where aircraft bound for Russia were ferried from their manufacturing plants in Southern California.
The other route originated at Minneapolis, Minnesota, where Wold-Chamberlain Airport was used as an aircraft staging point for aircraft manufactured in the Midwest and northeastern United States.[1] The Minneapolis-Edmonton route, however was turned into a transport route only by the end of 1943, with aircraft ferrying operations being shifted to Great Falls. [3] In addition to the Lend-Lease aircraft, Alaskan Eleventh Air Force aircraft were also ferried up the NSR, with the aircraft being flown to Elmendorf Field, near Anchorage from RCAF Station Whitehorse upon their arrival.
Three main types of combat aircraft were ferried to the Soviet Union under Lend-Lease. Fighter aircraft were Bell P-39 Airacobras, and later its successor, the Bell P-63 Kingcobra, which were favored by the Red Air Force who used the two types with great success. The majority of the P-39s shipped to the Soviet Union were the definitive Q-models. Bombers included the Douglas A-20 Havoc light attack bomber and North American B-25 Mitchell medium bombers that were also sent to the Red Air Force. Transport aircraft were made up of predominantly, the Douglas C-47 Skytrain, also supplied in great numbers.
Possibly because of strict Soviet inspection standards, and also in spite of the Russian methods of flying them, there were remarkably few aircraft accidents. During the 21 months of the program, 7,983 aircraft were delivered to the Russians with only 133 lost to weather or pilot error.[5]Thirteen Red Air Force pilots were buried in the Fort Richardson cemetery.

The P-39's place in Soviet history


The most successful and numerous use of the P-39 was by the Red Air Force (Военно-воздушные силы, Voenno-Vozdushnye Sily, VVS). They received the considerably improved N and Q models via the Alaska-Siberia ferry route. The tactical environment of the Eastern Front did not demand the high-altitude performance RAF and AAF did. The comparatively low-speed, low-altitude nature of most air combat on the Russian Front suited the P-39's strengths: sturdy construction, reliable radio gear, and adequate firepower.
Soviet pilots appreciated the cannon-armed P-39 primarily for its air-to-air capability. A common Western misconception is that the Bell fighters were used as ground attack aircraft.
"One of the enduring myths regarding the P-39/P-63 in Soviet use is that because of its armament, in particular the 37mm nose cannon, it excelled as a ground-attack aircraft, even a 'tank buster.' In translating and preparing this manuscript for publication, I have had the opportunity to peruse several Russian-language sources. Mentions of the employment of this aircraft in the ground-attack role are so rare in these sources as to be exceptional ... The 'tank buster' myth has its roots in the misunderstanding of the general wartime role of the Red Air Force and in the imprecise translation of specific Russian-language terms that describe this role. The specific Russian-Language term most often used to describe the mission and role of the Airacobra-equipped Red Air Force fighter units, in this manuscript and other Russian-language sources , as prikrytiye sukhoputnykh voysk [coverage of ground forces]... Frequent misunderstanding in this country as to the combat role of the P-39 in Soviet use is based in part on imprecise translation of the term prikrytiye sukhoputnykh voysk to 'ground support'. The latter term as it is understood by many Western military historians and readers, suggests the attacking of ground targets in support of ground troops, also called "close air support." Soviet Airacobra pilot ever strafe a German tank? Undoubtedly. But this was never a primary mission or strong suit for this aircraft."
—Soviet Army Colonel Dmitriy Loza, Loza and Gebhardt 2002, pp. 15–16.

The Soviets developed successful group aerial fighting tactics for the Bell fighters and scored a surprising number of aerial victories over a variety of German aircraft. Soviet P-39s had no trouble dispatching Junkers Ju 87 Stukas or German twin-engine bombers and matched, and in some areas surpassed, early and mid-war Messerschmitt Bf 109s. The usual nickname for the Airacobra in the VVS was Kobrushka ("little cobra") or Kobrastochka, a portmanteau of Kobra and Lastochka (swallow), "dear little cobra".[52][53]

Mediterranean theater and the Tuskegee Airmen.

In North Africa, the 99th Fighter Squadron (also known as the Tuskegee Airmen) transitioned quickly from the P-40 and were assigned P-39s in February 1944, but only flew the type for a few weeks. The 99th carried out their duties including supporting Operation Shingle over Anzio as well as missions over the Gulf of Naples in the Airacobra but achieved few aerial victories.[51]

The major MTO P-39 operators included the 81st and 350th Fighter Groups, both flying the maritime patrol mission from North Africa and on through Italy. The 81st transferred to the China Burma India Theater by March 1944 and the 350th began transition to the P-47D in August 1944, remaining in Italy with the 12th Air Force.

For Professional pilots, an historic training film.

Historic and very comprehensive 1942 government training film for military pilots of the Bell P-39 Airacobra pursuit aircraft, examining flight techniques, cockpit layout, and armament (mostly of interest to professionals pilots - 37 minutes.) 





For More in formation on The Central Texas Wing of The Commemorative Air Force 

See the only regularly flying P-39 in the world at CAF-Centex wing Museum

View our vintage P-39 flying aircraft, the "Miss Connie at the Commemorative Air Force-CenTex Air wing Museum.

"Miss Connie" is on display (when not flying) at our CAF Centex wing Hanger-Museum.

Bell P-39 profile with Soviet WWII markings.

Bell P-39, its landing gear extended.

 "Miss Connie" parked in front of the Centex Wing Museum's hanger.

A great short P-39 video clip.

Our Bell P-39 - "Miss Connie" taking off. 
Definitely worth viewing. 33 seconds.


The History of Our P-39, the "Miss Connie"
Our fighter originally built in the late 30s and early 40s. Most were sent to the Soviet Union under lend-lease and were used against the Nazi's in the invasion of Russia in WWII. Has a 20 mm canon in the nose and was an excellent tank killer. This is the only P-39 flying in the Western Hemisphere.
P-39's unique front armament compartment
Bell P-39Q-5-BE, Bell construction number 21-9597, Army air Force serial number 42-19597 is the CAFs P-39 registered as civilian number N6968.It is the only regularly flying P-39 in the world.The aircraft was delivered to the AAF onMay 25, 1943 at a cost of $48,673.It was the second Q-5 produced. Through July 1943, it was on loan to Bell at Buffalo.On December 29, 1943, it was flown to Cincinnati, OH and then transferred to Laredo, TX by January 1944.By June 1944 it was transferred to Harlingen, Texas to support gunnery training there.
On July 20, 1945, it was making a cross-country flight to the Reconstruction Finance Corp scrap yard to be disposed of when the engine failed and the pilot landed the airplane at a crop dusting strip in Hobbs, New Mexico. The AAF abandoned the aircraft and it was later moved to a schoolyard display at Capitan High School in Lincoln, NM.
After acquiring the aircraft, Joe Brown of Hobbs, NM donated the hulk to the CAF in 1962.The aircraft only had 392 recorded hours on it at that time. The aircraft was then dismantled and trucked to Harlingen.In 1968, Don Hull of Sugarland, TX began restoring the aircraft to flying condition. It flew again on October 21, 1974. That same year John Stokes, the founder and first leader of the CENTEX Wing, bought the aircraft and again donated the restored P-39 to the CAF.
The aircraft has been flying out of the San Marcos Airport ever since.

During WWII, the WASP's played large role as ferry pilots in the Lend-Lease Program.

Air Transport Command ferry pilots, including U.S. women pilots of the WASP program, picked up the planes at the Bell factory at Niagara Falls, New York, and flew them to Great Falls, Montana and then onward via the Northwest Staging Route through Canada to Alaska, where Russian ferry pilots, many of them women, would take delivery of the aircraft at Nome [12] and fly them to the Soviet Union over the Bering Strait via the Alaska-Siberia route (ALSIB).

A very complete air show video (7 minutes.)
The Bell P-39 Airacobra was one of the principal American fighter aircraft in service when the United States entered World War II. It was the first fighter in history with a tricycle undercarriage and the first to have the engine installed in the center fuselage, behind the pilot. Although its mid-engine placement was innovative, the P-39 design was handicapped by the absence of an efficient turbo-supercharger, limiting it to low-altitude work. The P-39 was used with great success by the Soviet Air Force, who scored the highest number of individual kills attributed to any U.S. fighter type.[N 1] Other important users were the Free French and co-belligerent Italian air forces. Together with the derivative P-63 Kingcobra, these aircraft became the most successful mass-produced fixed-wing aircraft manufactured by Bell.
Copyright © 2012 Malcolm Auld




Technical Data for the Bell P-39M Airacobra

The Bell P-39 was the world's first fighter aircraft with tricycle landing gear and rear-mounted engine. The Soviet Air Force was the largest P-39 operator with approx. 5,000 aircraft.

Crew
1

Propulsion
1 Piston Engine
Engine Model
Allison V-1710-83
Engine Power
895 kW
1200 hp

Speed
620 km/h
335 kts
386 mph
Service Ceiling
10.973 m
36.000 ft
Range
1.046 km
565 NM
650 mi.

Empty Weight
2.545 kg
5.611 lbs
max. Takeoff Weight
3.810 kg
8.400 lbs

Wing Span
10,36 m
34,0 ft
Wing Area
19,8 m²
213 ft²
Length
9,19 m
30,2 ft
Height
3,61 m
11,8 ft

First Flight
07.10.1937
Production Status
out of production
Production Range
1940-1944
Total Production
9558

Data for (Version)          

Learn how the P-39 helped turn the tide of WWII, and changed the course of history. 

P-39 Historical Blog


For More in formation on The Central Texas Wing of The Commemorative Air Force 

Thursday, May 16, 2013

CAF - How to fly a P-39, Vintage training film

CAF Centex Wing Museum - How to fly our P-39. Here is a comprehensive vintage US Government training film.

This film is a must for anyone flying our rare P-39 and P-63 vintage flying aircraft.
CAF Centex Wing 's P-39 the "Miss Connie. We also have a flying P-63.

Please note: this is a cockpit photo of our P-63

Official training film. Part 1.
Official training film. Part 2.

Technical Data:
The P-39 was an all-metal, low-wing, single-engine fighter, with a tricycle undercarriage and an Allison V-1710 liquid-cooled V-12 engine mounted in the central fuselage, directly behind the cockpit.
The Airacobra was one of the first production fighters to be conceived as a "weapons system"; in this case the aircraft (known originally as the Bell Model 4) was designed around the 37mm T9 cannon.[28] This weapon, which was designed in 1934 by the American Armament Corporation, a division of Oldsmobile, fired a 1.3 lb (610 g) projectile capable of piercing .8 in (2 cm) of armor at 500 yd (450 m) with armor-piercing rounds. The 200 lb, 90 inch long weapon had to be rigidly mounted and fire parallel to and close to the centerline of the new fighter. It would be impossible to mount the weapon in the fuselage, firing through the propeller shaft as could be done with smaller 20mm cannon. Weight, balance and visibility problems meant that the cockpit could not be placed farther back in the fuselage, behind the engine and cannon.[28] The solution adopted was to mount the cannon in the forward fuselage and the engine in the center fuselage, directly behind the pilot's seat. The tractor propeller was driven via a 10-foot-long (3.0 m) drive shaft which was made in two sections, incorporating a self-aligning bearing to accommodate fuselage deflection during violent maneuvers. This shaft ran through a tunnel in the cockpit floor and was connected to a gearbox in the nose of the fuselage which, in turn, drove the three- or (later) four-bladed propeller via a short central shaft. The gearbox was provided with its own lubrication system, separate from the engine; in later versions of the Airacobra the gearbox was provided with some armor protection.[28] The glycol-cooled radiator was fitted in the wing center section, immediately beneath the engine; this was flanked on either side by a single drum shaped oil cooler. Air for the radiator and oil coolers was drawn in through intakes in both wing-root leading edges and was directed via four ducts to the radiator faces. The air was then exhausted through three controllable hinged flaps near the trailing edge of the center section. Air for the carburetor was drawn in via a raised oval intake immediately aft of the rear canopy.[29][30]

The fuselage structure was unusual and innovative, being based on a strong central keel which incorporated the armament, cockpit and engine. Two strong fuselage beams to port and starboard formed the basis of the structure. These angled upwards fore and aft to create mounting points for the T9 cannon and propeller reduction gearbox and for the engine and accessories respectively. A strong arched bulkhead provided the main structural point to which the main spar of the wing was attached. This arch incorporated a fireproof panel and an armor plate separating the engine from the cockpit. It also incorporated a turnover pylon and a pane of bullet-resistant glass behind the pilot's head. The arch also formed the basis of the cockpit housing; the pilot's seat was attached to the forward face as was the cockpit floor. Forward of the cockpit the fuselage nose was formed from large removable covers. A long nose wheel well was incorporated in the lower nose section. The engine and accessories were attached to the rear of the arch and the main structural beams; these too were covered using large removable panels. A conventional semi-monocoque rear fuselage was attached aft of the main structure.[29][N 5]
Front armament bay
Because the pilot was above the extension shaft, he was placed higher in the fuselage than in most contemporary fighters, which, in turn gave the pilot a good field of view.[28] Access to the cockpit was via sideways opening "car doors", one on either side. Both had wind-down windows; because only the right hand door had a handle both inside and outside this was used as the normal means of access. The left hand door could only be opened from the outside and was for emergency use, although both doors could be jettisoned. In service the cockpit was difficult to escape from in an emergency because the roof was fixed.[31]

The complete armament fit consisted of the T9 with a pair of Browning M2 .50 caliber (12.7 mm) machine guns mounted in the nose. This would change to two .50 in (12.7 mm) and two .30 in (7.62 mm) guns in the XP-39B (P-39C, Model 13, the first 20 delivered) and two 0.50 in/12.7 mm and four 0.30 in/7.62 mm (all four in the wings) in the P-39D (Model 15), which also introduced self-sealing tanks and shackles (and piping) for a 500 lb (227 kg) bomb or drop tank.[22]

Because of the unconventional layout, there was no space in the fuselage to place a fuel tank. Although drop tanks were implemented to extend its range, the standard fuel load was carried in the wings, with the result that the P-39 was limited to short range tactical strikes.[32]

A heavy structure, and around 265 lb (120 kg) of armor were characteristic of this aircraft as well. The production P-39's heavier weight combined with the Allison engine having only a single-stage, single-speed supercharger, limited the high-altitude capabilities of the fighter. The P-39's altitude performance was markedly inferior to the contemporary European fighters and, as a result, the first USAAF fighter units in the European Theater were equipped with the Spitfire V. However, the P-39D's roll rate was 75°/s at 235 mph (378 km/h)– better than the A6M2, F4F, F6F, or P-38 up to 265 mph (426 km/h). (see NACA chart).[33]

Above the supercharger's critical altitude of about 12,000 ft (3,658 m), an early P-39's performance dropped off rapidly. This limited its usefulness in traditional fighter missions in Europe as well as in the Pacific, where it was not uncommon for Japanese bombers to attack at altitudes above the P-39's operational ceiling (which in the tropical hot air was lower than in moderate climates). The late production N and Q models, making up 75% of all Airacobras, could maintain a top speed of approximately 375 mph (604 km/h) up to 20,000 ft (6,100 m).

The weight distribution of the P-39 was supposedly the reason for its tendency to enter a dangerous flat spin, a characteristic Soviet test pilots were able to demonstrate to the sceptical manufacturer who had been unable to reproduce the effect. After extensive tests, it was determined the spin could only be induced if the aircraft was improperly loaded, with no ammunition in the front compartment. The flight manual noted a need to ballast the front ammunition compartment with the appropriate weight of shell casings to achieve a reasonable center of gravity. High speed controls were light, consequently, high speed turns and pull-outs were possible. The P-39 had to be held in a dive since it tended to level out, reminiscent of the Spitfire. Recommended dive speed limit (Vne) was 475 mph (764 km/h) for the P-39.[34]

Soon after entering service, pilots began to report that “during flights of the P-39 in certain maneuvers, it tumbled end over end.” Most of these events happened after the aircraft was stalled in a nose high attitude with considerable power applied. Concerned, Bell initiated a test program. Bell pilots made 86 separate efforts to reproduce the reported tumbling characteristics. In no case were they able to tumble the aircraft. In his autobiography veteran test and airshow pilot R.A. “Bob” Hoover provides an account of tumbling a P-39. He goes on to say that in hindsight, he was actually performing a Lomcevak, a now common airshow maneuver, which he was also able to do in a Curtiss P-40.[35] [N 6] An informal study of the P-39’s spinning characteristics was conducted in the NASA Langley Research Center 20-foot Free-Spinning Tunnel during the 1970s. A study of old reports showed that during earlier spin testing in the facility, the aircraft had never tumbled. However, it was noted that all testing had been done with a simulated full ammunition load, which drew the aircraft’s center of gravity forward. After finding the original spin test model of the P-39 in storage, the new study first replicated the earlier testing, with consistent results. Then, the model was re-ballasted to simulate a condition of no ammunition load, which moved the aircraft’s center of gravity aft. Under these conditions, the model was found to often tumble when thrown into the tunnel.[37]

The rear-mounted engine made the aircraft ideal for ground attack since fire would be coming from the front-bottom quarter and was less likely to hit the engine and its cooling systems. The arrangement proved to be very vulnerable to attacks from above and behind and nearly any hit on the fuselage from an attacking enemy fighter was virtually guaranteed to disable the cooling system and lead to the prompt demise of the engine and thus the aircraft. Flying at its upper altitude limits, the Airacobra was extremely vulnerable to any enemy fighter with decent high altitude performance.
For More in formation on The Central Texas Wing of The Commemorative Air Force