BT-13 Valiant
Encyclopedia
The Vultee BT-13 Valiant was an American
World War II
-era basic trainer aircraft built by Vultee Aircraft
for the United States Army Air Corps
, and later US Army Air Forces. A subsequent variant of the BT-13 in USAAC/USAAF service was known as the BT-15 Valiant, while an identical version for the US Navy was known as the SNV and was used to train naval aviator
s for the US Navy, US Marine Corps and US Coast Guard.
variable pitch propeller. It did not, however, have retractable landing gear nor a hydraulic system. The large flaps are operated by a crank-and-cable system. Its pilots nicknamed it the "Vultee Vibrator."
Due to the demand for this aircraft, and others which used the same Pratt & Whitney
engine, some were equipped with Wright
powerplants of similar size and power built in 1941-42. The Wright-equipped aircraft were designated BT-15.
The Navy adopted the P&W powered aircraft as their main basic trainer, designating it the SNV. The BT-13 production run outnumbered all other Basic Trainer (BT) types produced.
It was back in 1938 that Vultee Aircraft's chief designer, Richard Palmer, began the design of a fighter. At this time the USAAC issued a requirement and design contest for an advanced trainer for which substantial orders had been promised to the victor. Palmer began to adapt his design concept from a fighter to that of an advanced trainer and the result of this was the V-51 prototype.
The aircraft made its maiden flight sometime during March 1939 as a cantilever
low-wing monoplane of all-metal construction. Despite the use of metal throughout the design the control surfaces remained fabric-covered. The prototype was powered by a Pratt & Whitney R-1340
-S3H1-G Wasp radial rated at 600 hp (447 kW) driving a two-blade variable pitch metal propeller. Other features included an enclosed cockpit for the crew of two, integral fuel tanks in the wings, and a hydraulic system for the operation of the flaps and retractable main landing gear.
The V-51 was entered into the USAAC competition as the BC-51 during May 1939. The USAAC instead chose the North American BC-2, but purchased the BC-51 prototype anyway, designating it the BC-3. Despite the disappointment, Palmer was not finished yet. He continued to refine the design of the VF-51 into the VF-54 in an attempt to meet the expectation of an export market for just such a trainer. The VF-54 used the same basic airframe as the VF-51, but was fitted with a lower powered engine. No export sales were made.
From this design, evolved the VF-54A. Instead of retractable gear, it had fixed gear very nicely faired and a revised power plant of a Pratt & Whitney R-985
-T3B Wasp Jr. radial rated at 450 hp (335.5 kW) and the Vultee BT-13 Valiant was born.
The USAAC was made aware of the improvements made to the aircraft and in August 1939 the type was ordered as the BT-13. The initial order was for 300 aircraft with a Pratt & Whitney R-985
-25 radial and the first of these was accepted by the USAAC in June 1940.
The BT-13A was produced to the extent of 7,037 aircraft and differed only in the use of a Pratt & Whitney R-985
-AN-1 radial engine and lack of landing gear fairings. There were 1,125 BT-13B's produced and differed from the A model in having a 24-volt, rather than the original 12-volt electrical system.
The next variant was actually designated BT-15 because Pratt & Whitney found it impossible to keep up production of the R-985 engine. Instead a Wright R-975-11 radial was substituted into the 1,263 aircraft produced.
The US Navy began to show an interest in the aircraft as well and ordered 1,150 BT-13A models as the SNV-1. In addition, the Navy ordered some 650 aircraft designated as SNV-2, roughly equivalent to the BT-13B.
Once in service, the aircraft quickly got its nickname of "Vibrator." There are several explanations given for this nickname. 1: Because it had a tendency to shake quite violently as it approached its stall speed. 2. During more adventurous maneuvers the canopy vibrated. 3. On takeoff, the aircraft caused windows on the ground to vibrate. 4. The two-stage propeller had an irritating vibration in high pitch. The BT-13 served its intended purpose well. It and its successors were unforgiving aircraft to fly, but were also extremely agile. Thus the BT-13 made a good aircraft to help transition many hundreds of pilots toward their advance trainers and fighters yet to be mastered. The BT-13 was not without its faults. The tail was held on with only three bolts and after several in-flight failures, the Navy restricted the aircraft from aerobatic and violent maneuvers. The Navy declared the SNV obsolete in May 1945 and replaced it in the basic training role with the SNJ (AT-6). The Army also replaced the BT-13 with the AT-6 before the end of the war.
After World War II, virtually all were sold as surplus for a few hundred dollars each. Many were purchased just to obtain their engines, which were mounted on surplus biplanes (such as Stearmans) to replace their less powerful engines for use as cropdusters. The BT airframes were then scrapped. Today, some "BT's" (collectively, BT-13s, BT-15s and SNVs) are still flying, though in very limited numbers (and none in military or government service).
BT-13
BT-13A
BT-13B
BT-15
BT-16
SNV-1
SNV-2
T-13A
Egypt
Haiti
United States
One notable post-war "variant" of the BT's are the "Tora" aircraft. In the 1960s Twentieth Century Fox purchased many BT's and modified them (in some cases heavily) to appear similar to Japanese aircraft for use in the motion picture "Tora Tora Tora". The "Kate" torpedo bombers and "Val" dive bombers seen in this film are actually BT's (the "Zero" fighters are AT-6's). After the film, these aircraft were sold to private owners. Many are still flying, several of them as part of the Commemorative Air Force's
"Tora Tora Tora" squadron, which performs air battle reenactments at air shows. Several "Tora" aircraft also appeared in the later "Pearl Harbor
" film.
Comparable aircraft:
De Havilland Canada DHC-1 Chipmunk
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...
World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...
-era basic trainer aircraft built by Vultee Aircraft
Vultee Aircraft
The Vultee Aircraft Corporation became an independent company in 1939 and had limited success before merging with the Consolidated Aircraft Corporation in 1943 to form the Consolidated Vultee Aircraft Corporation, or Convair.-History:...
for the United States Army Air Corps
United States Army Air Corps
The United States Army Air Corps was a forerunner of the United States Air Force. Renamed from the Air Service on 2 July 1926, it was part of the United States Army and the predecessor of the United States Army Air Forces , established in 1941...
, and later US Army Air Forces. A subsequent variant of the BT-13 in USAAC/USAAF service was known as the BT-15 Valiant, while an identical version for the US Navy was known as the SNV and was used to train naval aviator
Naval Aviator
A United States Naval Aviator is a qualified pilot in the United States Navy, Marine Corps or Coast Guard.-Naming Conventions:Most Naval Aviators are Unrestricted Line Officers; however, a small number of Limited Duty Officers and Chief Warrant Officers are also trained as Naval Aviators.Until 1981...
s for the US Navy, US Marine Corps and US Coast Guard.
Design and development
The Vultee BT-13 was the basic trainer flown by most American pilots during World War II. It was the second phase of the three phase training program for pilots. After primary training, the student pilot moved to the more complex Vultee for basic flight training. The BT-13 had a more powerful engine and was faster and heavier than the primary trainer. It required the student pilot to use two way radio communications with the ground and to operate landing flaps and a two-position Hamilton StandardHamilton Standard
Hamilton Standard, an aircraft propeller parts supplier, was formed in 1929 when United Aircraft and Transport Corporation consolidated Hamilton Aero Manufacturing and Standard Steel Propeller into the Hamilton Standard Propeller Corporation. Other members of the corporation included Boeing,...
variable pitch propeller. It did not, however, have retractable landing gear nor a hydraulic system. The large flaps are operated by a crank-and-cable system. Its pilots nicknamed it the "Vultee Vibrator."
Due to the demand for this aircraft, and others which used the same Pratt & Whitney
Pratt & Whitney
Pratt & Whitney is a U.S.-based aerospace manufacturer with global service operations. It is a subsidiary of United Technologies Corporation . Pratt & Whitney's aircraft engines are widely used in both civil aviation and military aviation. Its headquarters are in East Hartford, Connecticut, USA...
engine, some were equipped with Wright
Wright Aeronautical
Wright Aeronautical was an aircraft and aircraft engine manufacturer located in New Jersey.-History:This American company evolved from the 1909-1916 Wright Company, which merged with the Glenn L. Martin Company in 1916 to form the Wright-Martin Aircraft Corporation. Glenn Martin resigned from...
powerplants of similar size and power built in 1941-42. The Wright-equipped aircraft were designated BT-15.
The Navy adopted the P&W powered aircraft as their main basic trainer, designating it the SNV. The BT-13 production run outnumbered all other Basic Trainer (BT) types produced.
It was back in 1938 that Vultee Aircraft's chief designer, Richard Palmer, began the design of a fighter. At this time the USAAC issued a requirement and design contest for an advanced trainer for which substantial orders had been promised to the victor. Palmer began to adapt his design concept from a fighter to that of an advanced trainer and the result of this was the V-51 prototype.
Cantilever
A cantilever is a beam anchored at only one end. The beam carries the load to the support where it is resisted by moment and shear stress. Cantilever construction allows for overhanging structures without external bracing. Cantilevers can also be constructed with trusses or slabs.This is in...
low-wing monoplane of all-metal construction. Despite the use of metal throughout the design the control surfaces remained fabric-covered. The prototype was powered by a Pratt & Whitney R-1340
Pratt & Whitney R-1340
|-See also:* Pratt & Whitney Wasp series* Pratt & Whitney R-985 Wasp Junior* Pratt & Whitney R-1535 Twin Wasp Junior* Pratt & Whitney R-1830 Twin Wasp-Bibliography:...
-S3H1-G Wasp radial rated at 600 hp (447 kW) driving a two-blade variable pitch metal propeller. Other features included an enclosed cockpit for the crew of two, integral fuel tanks in the wings, and a hydraulic system for the operation of the flaps and retractable main landing gear.
The V-51 was entered into the USAAC competition as the BC-51 during May 1939. The USAAC instead chose the North American BC-2, but purchased the BC-51 prototype anyway, designating it the BC-3. Despite the disappointment, Palmer was not finished yet. He continued to refine the design of the VF-51 into the VF-54 in an attempt to meet the expectation of an export market for just such a trainer. The VF-54 used the same basic airframe as the VF-51, but was fitted with a lower powered engine. No export sales were made.
From this design, evolved the VF-54A. Instead of retractable gear, it had fixed gear very nicely faired and a revised power plant of a Pratt & Whitney R-985
Pratt & Whitney R-985
The Pratt & Whitney R-985 Wasp Junior is a series of nine-cylinder air-cooled radial aircraft engines built by the Pratt & Whitney Aircraft Company from the 1930s to the 1950s. These engines have a displacement of ; initial versions produced , while the most widely used versions produce...
-T3B Wasp Jr. radial rated at 450 hp (335.5 kW) and the Vultee BT-13 Valiant was born.
The USAAC was made aware of the improvements made to the aircraft and in August 1939 the type was ordered as the BT-13. The initial order was for 300 aircraft with a Pratt & Whitney R-985
Pratt & Whitney R-985
The Pratt & Whitney R-985 Wasp Junior is a series of nine-cylinder air-cooled radial aircraft engines built by the Pratt & Whitney Aircraft Company from the 1930s to the 1950s. These engines have a displacement of ; initial versions produced , while the most widely used versions produce...
-25 radial and the first of these was accepted by the USAAC in June 1940.
The BT-13A was produced to the extent of 7,037 aircraft and differed only in the use of a Pratt & Whitney R-985
Pratt & Whitney R-985
The Pratt & Whitney R-985 Wasp Junior is a series of nine-cylinder air-cooled radial aircraft engines built by the Pratt & Whitney Aircraft Company from the 1930s to the 1950s. These engines have a displacement of ; initial versions produced , while the most widely used versions produce...
-AN-1 radial engine and lack of landing gear fairings. There were 1,125 BT-13B's produced and differed from the A model in having a 24-volt, rather than the original 12-volt electrical system.
The next variant was actually designated BT-15 because Pratt & Whitney found it impossible to keep up production of the R-985 engine. Instead a Wright R-975-11 radial was substituted into the 1,263 aircraft produced.
The US Navy began to show an interest in the aircraft as well and ordered 1,150 BT-13A models as the SNV-1. In addition, the Navy ordered some 650 aircraft designated as SNV-2, roughly equivalent to the BT-13B.
Once in service, the aircraft quickly got its nickname of "Vibrator." There are several explanations given for this nickname. 1: Because it had a tendency to shake quite violently as it approached its stall speed. 2. During more adventurous maneuvers the canopy vibrated. 3. On takeoff, the aircraft caused windows on the ground to vibrate. 4. The two-stage propeller had an irritating vibration in high pitch. The BT-13 served its intended purpose well. It and its successors were unforgiving aircraft to fly, but were also extremely agile. Thus the BT-13 made a good aircraft to help transition many hundreds of pilots toward their advance trainers and fighters yet to be mastered. The BT-13 was not without its faults. The tail was held on with only three bolts and after several in-flight failures, the Navy restricted the aircraft from aerobatic and violent maneuvers. The Navy declared the SNV obsolete in May 1945 and replaced it in the basic training role with the SNJ (AT-6). The Army also replaced the BT-13 with the AT-6 before the end of the war.
After World War II, virtually all were sold as surplus for a few hundred dollars each. Many were purchased just to obtain their engines, which were mounted on surplus biplanes (such as Stearmans) to replace their less powerful engines for use as cropdusters. The BT airframes were then scrapped. Today, some "BT's" (collectively, BT-13s, BT-15s and SNVs) are still flying, though in very limited numbers (and none in military or government service).
Variants
BC-3- Vultee Model V.51 with retractable landing gear and a 600hp P&W R-1340-45, one built, not developed.
BT-13
- Vultee Model V.54 with fixed undercarriage and a 450hp P&W R-985-25 engine, 300 built.
BT-13A
- As BT-13 but fitted with a 450hp R-985-AN-1 engine and minor changes, 6407 built, survivors re-designated T-13A in 1948.
BT-13B
- As BT-13A but with a 24-volt electrical system, 1125 built.
BT-15
- As BT-13A with a 450hp Wright R-975-11 engine, 1693 built.
BT-16
- One BT-13 was re-built in 1942 by Vidal with an all-plastic fuselage as the XBT-16.
SNV-1
- BT-13As for the United States Navy, 1350 transferred from USAAF.
SNV-2
- BT-13Bs for the United States Navy, 650 transferred from USAAF.
T-13A
- Surviving BT-13As were re-designated in 1948, due to dual allocation of T-13 with the PT-13 in practice they were still known as the BT-13 to avoid confusion.
Operators
- Brazilian Air ForceBrazilian Air ForceThe Brazilian Air Force is the air branch of the Brazilian Armed Forces and one of the three national uniformed services. The FAB was formed when the Army and Navy air branch were merged into a single military force initially called "National Air Forces"...
(BT-15)
- Colombian Air ForceColombian Air ForceThe Colombian Air Force or FAC is the Air Force of the Republic of Colombia.The Colombian Air Force is one of the three institutions of the Armed Forces of Colombia, charge according to the 1991 Constitution of the work to exercise and maintain control of Colombia's airspace to defend the...
(BT-15)
Egypt Haiti
- Armed Forces of HaitiArmed Forces of HaitiThe Armed Forces of Haiti, , consisted of the Haitian Army, Haitian Navy , Haitian Coast Guard, the Haitian Air Force, and some police forces . The Army was always the dominant service with the others serving primarily in a support role...
- Indonesian Air ForceIndonesian Air ForceThe Indonesian Air Force is the air force branch of the Indonesian National Armed Forces.The Indonesian Air Force has 34,930 personnel equipped with 110 combat aircraft including Su-27 and Su-30.-Before Indonesian independence :...
- Israeli Air ForceIsraeli Air ForceThe Israeli Air Force is the air force of the State of Israel and the aerial arm of the Israel Defense Forces. It was founded on May 28, 1948, shortly after the Israeli Declaration of Independence...
- Paraguayan Air Arm 10 BT-13A received through Lend-Lease 1942-1943. Two BT-13 bought in Argentina in 1947.
- Paraguayan Naval Aviation Three BT-13 donated by Argentina in the 1960s.
- Soviet Air ForceSoviet Air ForceThe Soviet Air Force, officially known in Russian as Военно-воздушные силы or Voenno-Vozdushnye Sily and often abbreviated VVS was the official designation of one of the air forces of the Soviet Union. The other was the Soviet Air Defence Forces...
United States
- United States Air ForceUnited States Air ForceThe United States Air Force is the aerial warfare service branch of the United States Armed Forces and one of the American uniformed services. Initially part of the United States Army, the USAF was formed as a separate branch of the military on September 18, 1947 under the National Security Act of...
- United States Army Air ForcesUnited States Army Air ForcesThe United States Army Air Forces was the military aviation arm of the United States of America during and immediately after World War II, and the direct predecessor of the United States Air Force....
- United States NavyUnited States NavyThe United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...
Popular culture
Commemorative Air Force
The Commemorative Air Force , formerly known as the Confederate Air Force, is a Texas-based non-profit organization dedicated to preserving and showing historical aircraft at airshows primarily throughout the U.S. and Canada...
"Tora Tora Tora" squadron, which performs air battle reenactments at air shows. Several "Tora" aircraft also appeared in the later "Pearl Harbor
Pearl Harbor (film)
Pearl Harbor is a 2001 American action drama war film directed by Michael Bay and produced by Jerry Bruckheimer and Randall Wallace, who wrote the screenplay...
" film.
General characteristics
- Crew: two, student and instructor
- Length: 28 ft 10 in (8.79 m)
- Wingspan: 42 ft 0 in (12.80 m)
- Height: 11 ft 6 in (3.51 m)
- Wing area: 239 ft² (22 m²)
- Airfoil: root: NACA 0018-64 mod; tip: NACA0009-64 mod (symmetrical)
- Empty: 3,375 lb (1,531 kg)
- Maximum takeoff: 4,496 lb (2,039 kg)
- Powerplant: 1 x Pratt & Whitney R-985Pratt & Whitney R-985The Pratt & Whitney R-985 Wasp Junior is a series of nine-cylinder air-cooled radial aircraft engines built by the Pratt & Whitney Aircraft Company from the 1930s to the 1950s. These engines have a displacement of ; initial versions produced , while the most widely used versions produce...
-AN-1, 450 hp (336 kW)
Performance
- Maximum speed: 180 mph (290 km/h)
- Range: 725 miles (1,167 km)
- Service ceiling: 21,650 ft (6,600 m)
Static displays
- Jimmy Doolittle Air & Space MuseumJimmy Doolittle Air & Space MuseumThe Jimmy Doolittle Air & Space Museum is an extensive aviation museum located at Travis Air Force Base in Fairfield, California. The museum houses 35+ aircraft displays and various other informative artifacts.-History:...
, Travis Air Force BaseTravis Air Force BaseTravis Air Force Base is a United States Air Force air base under the operational control of the Air Mobility Command , located three miles east of the central business district of Fairfield, in Solano County, California, United States. The base is named for Brigadier General Robert F...
, Fairfield, CaliforniaFairfield, CaliforniaFairfield is a city located in Solano County in Northern California, USA. It is generally considered the midpoint between the cities of San Francisco and Sacramento, approximately from the city center of both cities, approximately from the city center of Oakland, less than from Napa Valley, 18... - Mid-Atlantic Air MuseumMid-Atlantic Air MuseumThe Mid-Atlantic Air Museum is membership supported museum and aircraft restoration facility located at the Carl A. Spaatz Field, the regional airport serving Reading, Pennsylvania. The museum, founded by Russ Strine, the current President, collects and actively restores historic war planes and...
, Reading, PennsylvaniaReading, PennsylvaniaReading is a city in southeastern Pennsylvania, USA, and seat of Berks County. Reading is the principal city of the Greater Reading Area and had a population of 88,082 as of the 2010 census, making it the fifth most populated city in the state after Philadelphia, Pittsburgh, Allentown and Erie,...
- 1942 BT-13A Valiant - Castle Air MuseumCastle Air MuseumCastle Air Museum is a military aviation museum located in Atwater, California, United States adjacent to the site of the former Castle Air Force Base...
, Atwater, CaliforniaAtwater, CaliforniaAtwater is a city on U.S. Route 99 in Merced County, California, United States. Atwater is west-northwest of Merced, at an elevation of 151 feet . The population as of the 2010 census was 28,168.-Geography:... - Kalamazoo Air Zoo, Kalamazoo, MichiganKalamazoo, MichiganThe area on which the modern city stands was once home to Native Americans of the Hopewell culture, who migrated into the area sometime before the first millennium. Evidence of their early residency remains in the form of a small mound in downtown's Bronson Park. The Hopewell civilization began to...
- Combat Air MuseumCombat Air MuseumThe Combat Air Museum is located in Williamsport Township, Shawnee County, near Topeka, Kansas at Forbes Field airport. The Museum rents two hangars from the MTAA. It is one of a handful of major aviation museums in the United States located on an active air field...
, Topeka, KansasTopeka, KansasTopeka |Kansa]]: Tó Pee Kuh) is the capital city of the U.S. state of Kansas and the county seat of Shawnee County. It is situated along the Kansas River in the central part of Shawnee County, located in northeast Kansas, in the Central United States. As of the 2010 census, the city population was... - Estrella WarBirds Museum, Paso Robles, CaliforniaPaso Robles, CaliforniaPaso Robles is a city in San Luis Obispo County, California, United States. Paso Robles is the fastest growing city in San Luis Obispo County: Its population at the 2000 census was 24,297; in 2010 it recorded some 29,793 residentsLocated on the Salinas River north of San Luis Obispo, California,...
- Goodfellow Air Force BaseGoodfellow Air Force BaseGoodfellow Air Force Base is a non-flying United States Air Force base located in San Angelo, Texas. As part of Air Education & Training Command , Goodfellow's main mission is cryptologic and intelligence training for the Air Force, Army, Navy and Marine Corps. Military firefighters are also...
, TexasTexasTexas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in... - Museu AeroespacialMuseu AeroespacialMuseu Aeroespacial is a national aviation museum located 25 km west of Rio de Janeiro, Brazil.-History:The Museu Aeroespacial was inaugurated on 18 October 1976 at the installations of the old Escola de Aeronáutica , at Afonsos Air Force Base - the "Cradle of Military...
, Rio de JaneiroRio de JaneiroRio de Janeiro , commonly referred to simply as Rio, is the capital city of the State of Rio de Janeiro, the second largest city of Brazil, and the third largest metropolitan area and agglomeration in South America, boasting approximately 6.3 million people within the city proper, making it the 6th...
, BrazilBrazilBrazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people... - Maxwell Air Force Base Gunter-Annex, AlabamaAlabamaAlabama is a state located in the southeastern region of the United States. It is bordered by Tennessee to the north, Georgia to the east, Florida and the Gulf of Mexico to the south, and Mississippi to the west. Alabama ranks 30th in total land area and ranks second in the size of its inland...
External links
- BT-13 Vultee Valiant - WWII Trainer Aircraft History and Information Site
- Vultee BT-13A Serial #41-11584 on display at Combat Air Museum
- The Air Mobility Command Museum http://www.amcmuseum.org/Index.htm
- -s/n (BuAero 156739) on display at Estrella Warbirds Museum, Paso Robles, CA
- Goodfellow AFB, BT-13A 42-04130
See also
Related development:Comparable aircraft:
De Havilland Canada DHC-1 Chipmunk
De Havilland Canada DHC-1 Chipmunk
The de Havilland Canada DHC-1 Chipmunk is a tandem, two-seat, single-engined primary trainer aircraft which was the standard primary trainer for the Royal Canadian Air Force, Royal Air Force and several other air forces through much of the post-Second World War years...