American biplane military training aircraft in use 1934 through WWII
TheStearman (Boeing) Model 75 is an Americanbiplane formerly used as a militarytrainer aircraft , of which at least 10,626 were built in theUnited States during the 1930s and 1940s.[ 2] Stearman Aircraft became asubsidiary ofBoeing in 1934. Widely known as theStearman ,Boeing Stearman , orKaydet , it served as a primary trainer for theUnited States Army Air Forces , theUnited States Navy (as the NS and N2S), and with theRoyal Canadian Air Force as the Kaydet throughoutWorld War II . After the conflict was over, thousands of surplus aircraft were sold on the civilian market. In the immediate postwar years, they became popular ascrop dusters and sports planes, and foraerobatic andwing walking use inair shows .
Design and development [ edit ] AWAVE in a Boeing Stearman N2S United States Navy training aircraft United States Navy N2S-2 atNAS Corpus Christi, 1943 United States Navy NS-1s of theNAS Pensacola Flight School , 1936 Boeing Stearman E75 (PT-13D) of 1944 Vintage Boeing-Stearman Model 75,Breitling SA Boeing Stearman (PT-13D) of the TALOA inDirgantara Mandala Museum , Indonesia Boeing Stearman (PT-13) of the Israeli Air Force United States Navy N2S ambulance atNAS Corpus Christi , 1942 Boeing Stearman PT-17, Museum of Historical Studies Institute of Aerospace in Perú – Lima PT-17 "Kaydet" on display at theMuseum of Aviation ,Robins AFB Boeing Stearman PT-17 Kaydet –Aeronautics Museum of Maracay In late 1933, Stearman engineers Mac Short, Harold W. Zipp, and J. Jack Clark took a 1931Lloyd Stearman design, and addedcantilever landing gear and adjustable elevatortrim tabs , to produce the Model 70. Able to withstand +12g and -9g, the aircraft was powered by a 210-hpLycoming R-680 , first flew on 1 January 1934, before flight tests were conducted atWright Field ,Naval Air Station Anacostia , and Pensacola. The Navy then requested a similar model built to Navy specifications, including a 200-hp Wright J-5 engine. The resultant Model 73, was designated NS-1 by the Navy, of which 41 were ordered, including enough spares to build another 20 aircraft.[ 3]
In the summer of 1934, Stearman engineers refined the Model 73 into the Model X75. The Army Air Corps evaluated the plane that autumn, powered by a 225-hp Wright R-760 or a 225-hp Lycoming R-680. In July 1935, the Army Air Corps ordered 26 with the Lycoming engine, designated the PT-13A, while the navy ordered an additional 20. In August 1936, the Army ordered an additional 50 PT-13As, followed by another 30 in October, and another 28 in December. Simultaneously, the company received orders for its primary trainer from the Argentinian navy, thePhilippine Army Air Corps , and the Brazilian Air Force. In January 1937, the army ordered another 26 PT-13As.[ 3]
On 6 June 1941, the U.S. government issued ApprovedType Certificate No. 743 for the civilian version of the Model 75. Designated the Model A75L3 (PT-13) and Model A75N1 (PT-17), about 60 were sold to civilian flights schools such asParks College of Engineering, Aviation and Technology , and for export.[ 3] : 148
On 15 March 1941, the company delivered the 1000th trainer to the Army, and the 1001st trainer to the Navy. Then on 27 August 1941, the company delivered the 2000th trainer to the Army. On 27 July 1944, the company delivered its 10,000th primary trainer.[ 3] : 145–148, 168
The Kaydet was a conventional biplane of rugged construction, with a large, fixed tailwheel undercarriage, and accommodation for the student and instructor in opencockpits in tandem. The radial engine was usually not cowled, although some Stearman operators choose to cowl the engine, most notably theRed Baron Stearman Squadron .
Operational history [ edit ] After World War II, thousands of surplus PT-17s were auctioned off to civilians and former military pilots. Many were modified for crop-dusting use, with a hopper for pesticide or fertilizer fitted in place of the front cockpit. Additional equipment included pumps, spray bars, and nozzles mounted below the lower wings. A popular approved modification to increase the maximum takeoff weight and climb performance involved fitting a largerPratt & Whitney R-985 Wasp Junior engine and aconstant-speed propeller .
Data from: United States Navy aircraft since 1911,[ 4] Boeing aircraft since 1916[ 5] 8,584 Model 70s, 75s and 76s were built, with additional "spares" bringing the number up to the sometimes quoted 10,346.[ 1]
USAAC/USAAF designations[ edit ] The U.S. Army Air Forces Model 75 Kaydet had three different designations, PT-13, PT-17 and PT-18, depending on which type of radial engine was installed.
PT-13 Initial production version withLycoming R-680 -B4B engine, 26 built in 1936PT-13A Model A75 with R-680-7 engine, 92 delivered from 1937 to 1938.PT-13B R-680-11 engine, 255 delivered from 1939 to 1941.PT-13C Six PT-13Bs modified for instrument flying.PT-13D Model E75 with R-680-17 engine, 793 delivered PT-17 Version withContinental R-670 -5 engine, 2,942 delivered.PT-17A 136 PT-17s modified with blind-flying instrumentation.PT-17B Three PT-17s modified with agricultural spraying equipment for pest control near army bases.PT-17C Single PT-17 conversion with standardized Army-Navy equipment. PT-18 Version withJacobs R-755 -7 engine, 150 built. Further production was cancelled as the engines were needed for other types of trainers.PT-18A Six PT-18s modified with blind-flying instrumentation. PT-27 USAAF paperwork designation given to 300 D75N1/PT-17 aircraft supplied underLend-Lease to theRoyal Canadian Air Force . The last example built, FK108, had a canopy installed.[ a] [ 6] US Navy designations [ edit ] NS Up to 61 Model 73B1 delivered, powered by 220 hp (160 kW)Wright J-5/R-790 Whirlwind radials[ 7] N2S Known colloquially as the "Yellow Peril" from its overall yellow paint scheme.N2S-1 Model A75N1 with Continental R-670-14 engine, 250 delivered.N2S-2 Model B75 with Lycoming R-680-8 engine, 125 delivered in 1941.N2S-3 Model B75N1 with Continental R-670-4 engine, 1,875 delivered.N2S-4 Model A75N1 with Continental R-670-4 and -5 engines, 457 delivered of 579 ordered, including 99 PT-17s diverted from U.S. Army orders.N2S-5 Model E75 with Lycoming R-680-17 engine, 1,450 delivered. Company designations [ edit ] Stearman 70 Company designation for prototype, powered by 215 hp (160 kW) Lycoming radial engine, designated XPT-943 for evaluation[ 8] Model 73 Initial production version, 61 built for U.S. Navy asNS plus export variants[ 7] Model 73L3 Version for the Philippines, powered by 200 hp (150 kW) R-680-4 or R-680C1 engines, seven built[ 9] Model A73B1 Seven aircraft forCuban Air Force powered by 235 hp (175 kW)Wright R-790 Whirlwind , delivered 1939–1940[ 9] Model A73L3 Improved version for the Philippines, three built[ 10] Stearman 75 (or X75) Evaluated by the U.S. Army as a primary trainer, the X75L3 became the PT-13 prototype. Variants of the 75 formed the PT-17 family. Stearman 76 Export trainer and armed version of the 75 with a gun ring and one or two fixed forward firing machine guns.A76B4 5 built for Venezuela. A76C3 15 built for Brazil. B76C3 15 built with cameras for Brazil. 76D1 16 built for Argentina and three for Philippines as BT-1. S76D1 seaplane version of 76D1 for Argentina 76D3 24 built for Philippine Constabulary as BT-1 armed advanced trainer, and 24 built for Cuba. Stearman XPT-943 Designation assigned to the X70 evaluated at Wright Field Stearman Kaydet Name used for aircraft in Royal Canadian Air Force service American Airmotive NA-75 Single-seat agricultural conversion of Model 75, fitted with new, high-lift wings[ 11] Argentina Bolivia Brazil Brazilian Air Force Model A75L3 and 76.[ 15] Canada Royal Canadian Air Force received 301 PT-27s under Lend Lease.[ 16] Republic of China Republic of China Air Force received 150 PT-17s under Lend-Lease,[ 17] and 104 refurbished aircraft post war in Taiwan. The ROCAF used them until 1958.[ 18] Colombia Colombian Air Force [ 14] Cuba Dominican Republic Greece Guatemala Honduras Iran Imperial Iranian Air Force Israel Israeli Air Force purchased 20 PT-17s.[ 19] Mexico Mexican Air Force Nicaragua Nicaraguan Air Force [citation needed ] Paraguay Paraguayan Air Force [ 14] Peru Peruvian Air Force [citation needed ] Philippines Philippine Constabulary Air Corps Philippine Army Air Corps [ 15] Philippine Air Force United States United States Army Air Corps /United States Army Air Forces [ 15] United States Marine Corps [citation needed ] United States Navy [ 15] Venezuela Venezuelan Air Force [ 15] Yugoslavia Yugoslav Air Force A considerable number of Stearmans remain in flying condition throughout the world, as the type remains a popular sport plane andwarbird .
Argentine Naval Aviation N2S-5 preserved in flight condititon 75-6488 – B75N1 registered as VH-EYC, airworthy, owned by Steven Bradley, South Australia 5134[ 20] 75-7462 - B75N1 - registered as VH-PWS, airworthy, owned by Michael Murphy, Royal Aero Club of Victoria. 75-8314 – E75 Registered as VH-USE, airworthy, owned by Raalin, Western Australia 6208[ 21] 75-2606 – Registered as OE-CBM, airworthy 75-5032 – PT-17 Registered as OE-AMM, airworthy atHangar-7 ,Salzburg [ 22] T5-1556 – PT-17 is airworthy with Erling Pétur Erlingsson inHafnarfjörður, Capital Region . It is the oldest airplane in Iceland. It was brought to the country in 1941 by the aircraft carrierUSS Wasp and damaged in an accident in 1943.[ 40] [ 41] [ 42] 75-647 – PT-17 airworthy with R. J. S. Jenkins inArdmore, Auckland .[ 49] 75-2055 – PT-17 airworthy with R. B. Mackley inMilford .[ 50] 75-2100 – PT-17 airworthy with Classic Aircraft Sales Limited inBlenheim .[ 51] 75-2724 – PT-17 airworthy with B. L. Govenlock inHastings .[ 52] 75-3132 – PT-17 airworthy with the Antonievich Family Trust inPukekohe .[ 53] 75-3655 – PT-17 airworthy with M. P. Cantlon inMount Maunganui .[ 54] 75-4245 – PT-17 airworthy with the Strome Farm Trust inDrury .[ 55] 75-5064 – PT-13D airworthy with the Stearman Syndicate in Drury.[ 56] 75-5907 – PT-13D airworthy with Stearman 03 Limited in Mount Maunganui.[ 57] 75-8025A – N2S-3 airworthy with M. J. Dean in Mount Maunganui.[ 58] 75-5436 – PT-13D is airworthy, registered as HB-RBG, and based at the FliegermuseumAltenrhein .[ 61] Built in 1943 and restored to airworthiness in 1989 after sustaining considerable damage during an emergency landing in the grounds of theStadler Rail factory in Altenrhein due to engine failure.[ 62] Boeing-Stearman NS2-S at theArkansas Air & Military Museum inFayetteville, Arkansas Boeing-Stearman Kaydet at theAir Zoo Boeing Stearman at theCavanaugh Flight Museum Boeing Stearman at theCollege Park Aviation Museum Model 70 is airworthy at theWestern Antique Aeroplane & Automobile Museum inHood River, Oregon . It is the original prototype of the Model 75.[ 64] 37-0099 – PT-13A is on static display at theMuseum of Flight inSeattle, Washington .[ 65] [ 66] 41-7121 - PT-17 is on static display at theUS Army Aviation Museum inFort Novosel, Alabama . 41-7960 – PT-17 is airworthy atMississippi State University inStarkville, Mississippi . It is used as a research aircraft and glider tow-plane.[ 67] [ 68] 41-8786 – PT-17 is in storage at theNew England Air Museum inWindsor Locks, Connecticut .[ 69] 41-8882 – PT-17 on static display at thePima Air and Space Museum inTucson, Arizona .[ 70] 41-25254 – PT-17 is airworthy at theMilitary Aviation Museum inPungo, Virginia .[ 71] [ 72] [ 73] 41-25284 – PT-17 is on static display at theHill Aerospace Museum inRoy, Utah .[ 74] 41-25588 – PT-17 is airworthy at theCharles M. Schulz–Sonoma County Airport inSanta Rosa, California .[ 75] [failed verification ] 41-25623 – PT-17 is on display atPatriots Point inCharleston, South Carolina .[citation needed ] 42-15687 – PT-27 is on display at theVintage Flying Museum inFort Worth, Texas .[ 76] 42-16365 – PT-17 is on static display at theMuseum of Aviation inWarner Robins, Georgia .[ 77] [ 74] 42-16388 – PT-17D is on static display at theMarch Field Air Museum nearRiverside, California .[ 78] 42-16691 – PT-17 is on static display at theCastle Air Museum inAtwater, California .[ 74] 42-17591 – PT-13D is on static display at thePlanes of Fame Air Museum inChino, California .[ 79] [ 80] [ 81] 42-17724 – PT-13D is on static display at theNational Museum of African American History and Culture inWashington, DC . It was used in 1944 to train members of the Tuskegee Airmen.[ 82] [ 83] [ 84] 42-17763 – PT-13D is on static display at the Planes of Fame Air Museum inValle, Arizona .[ 79] [ 80] [ 85] 42-17800 – PT-13D is on static display at theNational Museum of the United States Air Force inDayton, Ohio . This aircraft is the 63rd to last aircraft built and was donated to the museum in 1959 by theBoeing Aircraft Company , which purchased the Stearman Company in 1934.[ 86] [ 87] [ 88] 3514 – N2S-3 is airworthy with Neil Alan Raaz inColleyville, Texas .[ 89] [ 90] 3558 – N2S-2 is under restoration to airworthy condition at the Planes of Fame Air Museum in Chino, California.[ 79] [ 80] [ 91] 5369 – N2S-3 is on static display at theNational Naval Aviation Museum inPensacola, Florida . It was flown byGeorge H. W. Bush during his initial training as a naval pilot.[ 92] 7591 – N2S-3 is airworthy at theValiant Air Command Warbird Museum inTitusville, Florida .[ 93] [ 94] 7718 – N2S-3 is airworthy at theLone Star Flight Museum inHouston, Texas .[ 95] [ 96] 15923 – N2S is on static display at theCarolinas Aviation Museum inCharlotte, North Carolina .[ 97] [failed verification ] 29981 – N2S-4 is on display at theAir Zoo inKalamazoo, Michigan .[ 98] [ 99] 38278 – N2S-3 is airworthy at theTri-State Warbird Museum inBatavia, Ohio .[ 100] [ 101] 38490 – N2S-5 is airworthy at the Lone Star Flight Museum in Houston, Texas.[ 95] [ 102] 43197 – N2S-5 is under restoration to airworthy condition with theCommemorative Air Force Utah Wing inHeber City, Utah .[ 103] [ 104] 61064 – N2S-5 on static display at theUdvar-Hazy Center of theNational Air and Space Museum inChantilly, Virginia .[ 105] [ 106] 92468 – N2S-3 is on static display at thePacific Aviation Museum Pearl Harbor inHonolulu, Hawaii . It was flown by George H. W. Bush during his initial training as a naval pilot.[ 107] [ 108] 75-133 – PT-17 is airworthy at theSimsbury Airport inSimsbury, Connecticut . 75-3845 – PT-27 is under restoration to airworthy condition at theTexas Air Museum inSlaton, Texas .[ 109] 75-5337 – PT-13D is airworthy and owned by Sharon D. Smith. It is presumably located inDeRidder, Louisiana .[ 110] [ 111] 75-7540 – B75N1 is airworthy and resides at the Commemorative Air Force Airbase Arizona, Mesa, Arizona. 75-8234 - E75N1 is airworthy, owned by Ageless Aviation Dreams Foundation, Carson City, NV. 75-8498 – N2S-5 is airworthy at the CAF Big Easy Wing inNew Orleans, Louisiana .[ 112] A75N1 – PT-17 is on display at theCollege Park Aviation Museum inCollege Park, Maryland . It was flown byGus McLeod for the first open-cockpit flight over the North Pole.[ 113] N2S-3 is on display at the Western Antique Aeroplane and Automobile Museum in Hood River, Oregon.[ 114] Stearman on display at Scottsdale Airport (KSDL) Specifications (PT-17)[ edit ] 3-view line drawing of the Boeing N2S-3 Data from United States Military Aircraft since 1909[ 115]
General characteristics
Crew: 2Length: 24 ft 9 in (7.54 m)Wingspan: 32 ft 2 in (9.80 m)Height: 9 ft 8 in (2.95 m)Wing area: 298 sq ft (27.7 m2 )Empty weight: 1,931 lb (876 kg)Max takeoff weight: 2,635 lb (1,195 kg)Fuel capacity: 46 US gal (38 imp gal; 170 L)Powerplant: 1 ×Continental R-670-5 7-cylinder air-cooled radial piston engine, 220 hp (160 kW)Propellers: 2-bladed fixed-pitch propellerPerformance
Maximum speed: 124 mph (200 km/h, 108 kn)Cruise speed: 96 mph (154 km/h, 83 kn)Service ceiling: 13,200 ft (4,000 m)Time to altitude: 10,000 ft (3,000 m) in 17 minutes 18 secondsWing loading: 9.9 lb/sq ft (48 kg/m2 )Aircraft of comparable role, configuration, and era
^ However, extensive publication of pictures of this airframe resulted in the misconception that all PT-27s had canopies. ^a b Bowers, 1989, p.255 ^ National Museum of the United States Air Force gives the figure 10,346 but this includes the equivalent airframes in manufactured spare parts.^a b c d Phillips, Edward (2006).Stearman Aircraft: A Detailed History . North Branch, MN: specialtypress. pp. 118– 126.ISBN 9781580070874 . ^ Bowers, Peter M.; Swanborough, Gordon (1990).United States Navy aircraft since 1911 . Annapolis, Md.: Naval Institute Press. pp. 494– 495.ISBN 0870217925 . ^ Bowers, Peter M. (1989).Boeing aircraft since 1916 (3rd ed.). Annapolis: Naval Institute Press. pp. 251– 269.ISBN 978-0870210372 . ^ Mayborn, Mitch; Bowers, Peter M. (1973).Stearman Guidebook . 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Retrieved29 August 2024 .^ "Airframe Dossier – Stearman-Boeing PT-13D Kaydet, s/n 42-17174 USAAF, c/n 75-5337, c/r N13SS" .Aerial Visuals . Retrieved29 August 2024 .^ "The Stearman" .Commemorative Air Force-Big Easy Wing . 4 September 2018. Retrieved13 March 2023 .^ "1941 Boeing A75N1/PT-17 "Stearman" " . College Park Aviation Museum (M-NCPPC). Archived fromthe original on 30 August 2023. Retrieved30 August 2023 .^ "Stearman N2S-3" .Western Antique Aeroplane & Automobile Museum . Retrieved7 May 2020 .^ Swanborough and Bowers 1963, p. 443. Andrade, John.U.S. Military Aircraft Designations and Serials since 1909 , Midland Counties Publications, 1979,ISBN 0 904597 22 9 Avis, Jim and Bowman, Martin.Stearman: A Pictorial History . Motorbooks, 1997.ISBN 0-7603-0479-3 . Bowers, Peter M. Boeing Aircraft since 1916 . London:Putnam, 1989.ISBN 0-85177-804-6 .Nordeen, Lon.Fighters Over Israel . London: Guild Publishing, 1991. Phillips, Edward H.Stearman Aircraft: A Detailed History . 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Aircraft Military designations Companies
Aircraft Turbine engines Missiles Vessels Other
Advanced trainer (1925–1948) Basic combat (1936–1940) Basic trainer (1930–1948) Primary trainer (1924–1948) Main sequence (1948–present)
1948 redesignations New designations
Alternate sequences
1962 redesignations Since 1990
1 Not assigned • 2 Assigned to multiple types
USN /
USMC trainer aircraft designations pre–1962
N-series (1922–1948)
T-series (1948–1962)
1 Not assigned2 Assigned to a different manufacturer's type