Model Variants (Including Prototypes)
Model 17 - Base Series Designation
B17A - Initial production mark; bomber version; Pratt & Whitney R-1830-S1C3G Twin Wasp engines of up to 1,200 horsepower; 132 examples completed.
B17B - Bomber variant; SFA engine of 980 horsepower fitted; 55 examples completed.
B17C - Final bomber form; fitted with Piaggio P.XIbis R.C.40D engines of 1,040 horsepower.
S17BL - Reconnaissance variant with wheeled undercarriage; 21 examples procured.
S17BS - Reconnaissance variant with floatplane undercarriage; 38 examples procured.