Boeing-Stearman Model 75

Variants

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

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.

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 instrumention.

PT-27: Canadian PT-17. This designation was given to 300 aircraft supplied under Lend-Lease to the RCAF.

The US Navy had several versions including:

NS

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 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 diverted to the US Navy, plus 577 new-build aircraft.

N2S-5 R-680-17 engine. 1,450 delivered to the US Navy.

Stearman 70: (a.k.a. X70) The Wright Field XPT-943 based on the Stearman 6 Cloudboy.
Stearman 73: Civil production of the NS and PT-13.
Stearman 75: (a.k.a. X75) Evaluated by the 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 versions of the 75.
Stearman 90 and 91: (a.k.a. X90 & X91) Productionised metal framed version becoming the XBT-17.
Stearman XPT-943: The X70 evaluated at Wright Field.
American Airmotive NA-75: Single seat agricultural conversion of Model 75, fitted with new, high lift wings.