Model Variants (Including Prototypes)
X-70 - Original Stearman Prototype Model
Model 75 - Stearman Developed X-70; Became Boeing product through acquisition of the Stearman company.
NS-1 - US Navy Designation of the Model 73 production models; 61 examples delivered.
PT-13 - US Army Model Designation fitted with Lycoming R-680-5 radial 215hp piston engine; 26 examples delivered.
PT-13A - Further development of the PT-13; fitted with R-680-7 engine of 220hp; 92 examples produced.
PT-13B - Fitted with R-680-11 powerplant; 255 examples delivered.
PT-13C - Night Flying Conversion Models; 6 examples produced in this fashion.
PT-13D - "Common" US Army and Navy Production Model.
PT-17 - Fitted with Continental R-670-5 radial; 3,510 produced.
PT-17A - "Blind Flying" Variant with specialized instrumentation; 18 such produced.
PT-17B - "Pest Control" Variant for crop dusting; 3 such produced.
N2S - US Navy Model Designation based on the Model 75.
N2S-1 - USN Model; fitted with R-670-14 engine; 250 models produced.
N2S-2 - USN Model; fitted with R-680-8 engine; 125 produced.
N2S-3 - USN Model; fitted with R-670-4 engine; 1,875 produced.
N2S-4 - USN Model; fitted with R-670-5 engine; 1,051 produced.
N2S-5 - USN Model; fitted with R-680-17 engine; 1,450 examples produced.
PT-18 - Variants fitted with Jacob R-755-7 radial powerplant.
PT-18A - "Blind Flying" PT-18 Model Variant
PT-27 - Canadian Export Model; 300 examples delivered; named "Kaydet" in Canada which today translates as the series name as a whole; Enclosed cockpit.