Boeing-Stearman Model 75

The Stearman (Boeing) Model 75 is a biplane, of which 8584 were built in the United States during the 1930s and 1940s as a military trainer aircraft. Stearman became a subsidiary of Boeing in 1934. Widely known as the Stearman, Boeing Stearman or Kaydet, it served as a Primary trainer for the USAAF, as a basic trainer for the USN (as the NS1 & N2S), and with the RCAF as the Kaydet throughout World War II. After the conflict was over, thousands of surplus aircraft were sold on the civil market. In the immediate post-war years they became popular as crop dusters and as sports planes.


The Kaydet was a conventional biplane of rugged construction with 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.


The US Army Air Forces Kaydet had three different designations based on its power plant:

  • PT-13, with a Lycoming R-680 engine,
    • PT-13 Initial production. R-680-B4B engine. 26 built. Boeing Model 75.
    • 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. 318 delivered.
  • PT-17 with a Continental R-670 engine.
    • PT-17A 18 PT-17s were equipped with blind-flying instrumention.
    • PT-17B Three PT-17s were equipped with agricultural spraying equipment for pest-control.
  • PT-18 with a Jacobs R-755 engine.
    • PT-18A Six PT-18s fitted with blind-flying instrumention.
  • PT-26 This designation was given to 300 aircraft supplied under Lend-Lease to the RCAF.

The US Navy had several versions including:

  • NS-1 Up to 61 delivered.
  • N2S Known colloquially as the "Yellow Peril" from its overall-yellow paint scheme.
  • N2S-1 R-670-14 engine. 250 delivered to the US Navy.
  • N2S-2 R-680-8 engine. 125 delivered to the US Navy.
  • N2S-3 R-670-4 engine. 1,875 delivered to the US Navy.
  • N2S-4 99 US Army aircraft were diverted to the US Navy, plus 577 new aircraft were delivered to the US Navy.
  • N2S-5 R-680-17 engine. 1,450 delivered to the US Navy.


Specifications (PT-17)

{{aircraft specifications |plane or copter?=plane |jet or prop?=prop |ref={name of first source} |crew=two, student and instructor |capacity= |length main= 24 ft 3 in |length alt= 7.39 m |span main= 32 ft 2 in |span alt= 9.81 m |height main= 9 ft 2 in |height alt= 2.79 m |area main= |area alt= |airfoil= |empty weight main= 1,936 lb |empty weight alt= 878 kg |loaded weight main= |loaded weight alt= |useful load main= |useful load alt= |max takeoff weight main= 2,717 lb |max takeoff weight alt= 1,232 kg |more general= |engine (jet)= |type of jet= |number of jets= |thrust main= |thrust alt= |thrust original= |afterburning thrust main= |afterburning thrust alt= |engine (prop)=Continental R-670-5 |type of prop= |number of props=1 |power main= 220 hp |power alt= 164 kW |power original= |max speed main=124 mph |max speed alt= 198 km/h |cruise speed main= |cruise speed alt= |never exceed speed main= |never exceed speed alt= |stall speed main= |stall speed alt= |range main=505 mi |range alt= 808 km |ceiling main= 11,200 ft |ceiling alt= 3,415 m |climb rate main= |climb rate alt= |loading main= |loading alt= |thrust/weight= |power/mass main= |power/mass alt= |more performance= |armament= |avionics=


See also




  • Avis, Jim and BowmaN, Martin. Stearman: A Pictorial History. Motorbooks, 1997. ISBN 0-76030-479-3.
  • Phillips, Edward H. Stearman Aircraft: A Detailed History . Specialty Press, 2006. ISBN 1-58007-087-6.


  • Stearman, Lloyd. Stearmans, You Gotta Love Them. Lap Records, 2005. (NTSC Format)

External links

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