Model 75 (Stearman Kaydet)
Boeing Stearman N67193 in USN markings
Stearman Aircraft / Boeing
Stearman (Boeing) Model 75 is a biplane formerly used as a military trainer aircraft, of which at least 10,626 were built in the United States during the 1930s and 1940s.  Stearman Aircraft became a subsidiary of Boeing in 1934. Widely known as the Stearman, Boeing Stearman or Kaydet, it served as a primary trainer for the United States Army Air Forces, the United States Navy (as the NS & N2S), and with the Royal Canadian Air Force as the Kaydet throughout World 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 as crop dusters, sports planes, and for aerobatic and wing walking use in air shows.
Design and development
in a Boeing Stearman N2S United States Navy training aircraft.
Boeing Stearman E75 (PT-13D) of 1944.
Boeing Stearman (PT-13) of the Israeli Air Force.
Boeing Stearman PT-17, Museum of Historical Studies Institute of Aerospace in Perú - Lima.
The Kaydet was a conventional biplane of rugged construction with a large, fixed tailwheel undercarriage, and accommodation for the student and instructor in open
cockpits in tandem. The radial engine was usually uncowled, although some Stearman operators choose to cowl the engine, most notably the Red Baron Stearman Squadron.
After World War II, thousands of surplus PT-17s were auctioned off to civilians and former military pilots. Many were modified for
cropdusting 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 larger Pratt & Whitney R-985 Wasp Junior engine and a constant-speed propeller.
In popular culture
An iconic movie image is a Stearman cropduster chasing Cary Grant across a field in
(the airplane that chased Grant was actually a North by Northwest Naval Aircraft Factory N3N Canary; the plane that hits the truck is a Stearman). Christopher Reeve and Scott Wilson are shown flying 1936 variants in the 1985 movie .
The U.S. Army Air Forces Kaydet had three different designations based on its power plant:
with a Lycoming R-680 engine. 2,141 total all models. 
PT-13 Initial production. R-680-B4B engine. 26 built.
PT-13A R-680-7 engine. 92 delivered 1937-38. Model A-75.
PT-13B R-680-11 engine. 255 delivered 1939-40.
PT-13C Six PT-13Bs modified for instrument flying. PT-13D PT-13As equipped with the R-680-17 engine. 353 delivered. Model E-75. PT-17
With a Continental R-670-5 engine. 3,519 delivered
PT-17A 18 PT-17s were equipped with blind-flying instrumentation. PT-17B Three PT-17s were equipped with agricultural spraying equipment for pest-control. PT-18
PT-13 with a Jacobs R-755 engine, 150 built.
PT-18A Six PT-18s fitted with blind-flying instrumentation. PT-27
Canadian PT-17. This designation was given to 300 aircraft supplied under Lend-Lease to the RCAF.
The U.S. Navy had several versions including:
Up to 61 delivered. powered by surplus 220 hp (164 kW)
Wright J-5 Whirlwind.  N2S
Known colloquially as the "Yellow Peril" from its overall-yellow paint scheme.
N2S-1 R-670-14 engine. 250 delivered to the U.S. Navy.
N2S-2 R-680-8 engine. 125 delivered to the U.S. Navy.
N2S-3 R-670-4 engine. 1,875 delivered to the U.S. Navy.
N2S-4 99 US Army aircraft diverted to the U.S. Navy, plus 577 new-build aircraft. N2S-5 R-680-17 engine. 1,450 delivered to the U.S. Navy. Stearman 70
Original prototype, powered by 215 hp (160 kW) Lycoming radial engine. Temporary designation XPT-943 for evaluation.
 Model 73
Initial production version. 61 built for U.S. Navy as NS plus export variants.  Model 73L3
Version for Philippines, powered by 200 hp (150 kW) R-680-4 or R-680C1 engines. Seven built.
 Model A73B1
Seven aircraft for
Cuban Air Force powered by 235 hp (175 kW) Wright R-790 Whirlwind. Delivered 1939-1940.  Model A73L3
Improved version for Philippines. Three built.  Stearman 75
(a.k.a. 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.
Export trainer and armed versions of the 75.
Stearman 90 and 91
(a.k.a. X90 & X91) Productionized metal frame version, becoming the XBT-17.
The X70 evaluated at Wright Field.
American Airmotive NA-75 Single-seat agricultural conversion of Model 75, fitted with new, high-lift wings. 
Operators Argentina Bolivia
Brazilian Air Force model A75L3 and 76. 
Royal Canadian Air Force received 301 PT-27s under Lend Lease. 
Republic of China
Republic of China Air Force received 150 PT-17s under Lend-Lease, and 104 refurbished aircraft post war in Taiwan. The ROCAF used them until 1958.  
Colombian Air Force  Cuba Dominican Republic Greece Guatemala  Honduras
Imperial Iranian Air Force 
Israeli Air Force purchased 20 PT-17s. 
Mexican Air Force 
Nicaraguan Air Force
Paraguayan Air Force 
Peruvian Air Force
Philippine Army Air Corps 
Philippine Air Force 
United States Army Air Corps/ United States Army Air Forces 
United States Marine Corps
United States Navy 
Venezuelan Air Force 
Yugoslavia Yugoslav Air Force
A considerable number of Stearmans remain in flying condition throughout the world, as the type remains a popular sport plane and
Argentina Brazil Canada China/Taiwan Colombia Two PT-17s remain in active service for display (serials FAC-62 and FAC-1995). Israel Mexico Three PT-17s are on display at the Air College. Peru Spain Two PT-17s, one of them airworthy and the other one being restored, are on display at Fundación Infante de Orleans (FIO) in Cuatro Vientos ( Madrid)  Switzerland A PT-13D (HB-RBG) belonging to the Stearman Club, originally built in 1943 and restored in 1990 after a crash due to an engine failure, is based at the Fliegermuseum Altenrhein 
United States A Stearman Model 70 (N571Y): The original prototype of the Model 75 is in the final stages of restoration at
Western Antique Aeroplane & Automobile Museum. A PT-13D operated by the
United States Army Air Forces and used in 1944 for training members of the Tuskegee Airmen, is on static display at the  Smithsonian's National Museum of African American History and Culture in Washington, D.C. A PT-17 (A75N1; s/n 41-7960; c/n 75-1519; N53129) is in regular use at Mississippi State University as a research aircraft and glider tow-plane.
 A PT-17 (s/n 41-8022; N49760) is on display and available for flights at Flying Adventures, Johnson Aeronautical, St Petersburg Clearwater International Airport in St Pete, Florida
A PT-17 (s/n 41-8786; c/n 75-2345) is on display at the
New England Air Museum, Bradley International Airport, Windsor Locks, CT.  A PT-17 (s/n 41-25254; c/n 75-2743; N41EE) Kaydet is presented as a USN N2S-3 (a.k.a. "Yellow Peril") and is flown regularly at the
Military Aviation Museum in Pungo, Virginia. A PT-17 (A75L3; s/n 41-25588; c/n 75-3095; N62945) is in regular use at
Charles M. Schulz-Sonoma County Airport in Santa Rosa, California.  A PT-17 (s/n 41-25623; c/n 75-3130) is on display in the hangar deck of the
USS at The Yorktown (CV-10) Patriots Point Naval and Maritime Museum in Charleston, South Carolina. A PT-17 (s/n 42-15687; c/n 75-3876) is on display at Vintage Flying Museum, Meacham International Airport, Fort Worth, Texas.
)  A PT-27 (s/n 42-15804; c/n 75-3993; RCAF FJ943) is flown on behalf of the
No. 1 British Flying Training School Museum where it commemorates its service with the No. 1 BFTS during World War II from early 1943 to mid 1944. This particular aircraft was one of 300 given to the Royal Canadian Air Force under Lend-Lease and served in Canada from June 1942 to December 1942. A PT-13D (s/n 42-17800; c/n 75-5693) is on display at the
National Museum of the United States Air Force in Dayton, Ohio. This aircraft is from the last batch of Kaydets produced (contract numbers 75-5009 through 75-6026) and was donated to the museum in 1959 by the Boeing Aircraft Company, which purchased the Stearman Company in 1934.  A N2S-3 (BuNo 05369) flown by
George H. W. Bush during his initial training as a naval pilot is on display at the National Naval Aviation Museum at NAS Pensacola, Florida.  A N2S-3 (BuNo 92468; c/n 75-6707) in which
George H. W. Bush once flew as part of his navy training is on display at the Pacific Aviation Museum Pearl Harbor, on Ford Island, Pearl Harbor.   A N2S-3 (BuNo 38278; c/n 75-7899) is on display at the
Tri-State Warbird Museum in Batavia, Ohio.   A N2S (BuNo 15923) is on display
Carolinas Aviation Museum, Charlotte, North Carolina. An N2S-5 (BuNo 43197; c/n 75-8291) has been operated by the
Commemorative Air Force Utah Wing and is currently undergoing an extensive restoration. An annual gathering of surviving Stearman biplanes known as the "Stearman Fly-In" takes place during the first week of September at the
Galesburg Municipal Airport in Galesburg, Illinois.  A PT-17 is on display at the Museum of Aviation, Robins AFB, Warner Robins, Georgia
Specifications (PT-17) Data from United States Military Aircraft since 1909 
Aircraft of comparable role, configuration and era
National Museum of the United States Air Force gives the figure 10,346 but this includes the equivalent airframes in manufactured spare parts.
NMUSAF fact sheet: Stearman PT-13D Kaydet Archived August 1, 2010, at the Wayback Machine.. Retrieved 18 May 2010.
^ a b Bowers 1989, pp.252-253.
^ Bowers 1989, pp. 251-252.
^ a b Bowers 1989, p. 253.
^ Bowers 1989, p. 254.
^ Taylor 1965, p. 178.
^ Bowers 1989, p. 268.
^ a b
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^ a b c d e Andrade 1979, p. 158
^ Bowers 1989, p. 265.
^ Bowers 1989, p. 262.
^ Bowers 1989, pp. 260-261.
^ a b c d e
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