XPW-9-Three prototypes built for Air Service evaluation. First aircraft scrapped at McCook Field on February 21, 1925, second static tested in October 1928 and the third was still flying in December 1928.
PW-9-30 produced 1925-26, first production variant, D-12 engine.
PW-9A-24 produced 1926-27, D-12C engine.
PW-9B-One modified PW-9A, delivered as PW-9B in 1927.
PW-9C-40 produced 1927-28, D-12D engine.
PW-9D-16 produced 1928-34, final production variant.
XP-4-Designation of one PW-9 (ser no. 25-324) re-engined with 510 hp (380 kW) Packard 1A-1500 engine. Boeing Model 58.
AT-3-Designation of one PW-9A (ser no. 26-374) converted to single-seat trainer with Wright-Hispano engine.
FB-1-Ten built as FB-1s from initial order of 16, remaining six modified to other sub-types (FB-2, FB-3, FB-4). Powered by a 435 hp (324 kW) Curtiss D-12. Initial Navy delivery, shore-based only.
FB-2-Two FB-1s modified for carrier operation, 510 hp (380 kW) Packard 1A-1500 engine. Boeing designation Model 53.
FB-3-Three built to evaluate 510 hp (380 kW) Packard 1A-1500 engine, floatplane model. Boeing Model 55.
FB-4-One built, experimental model with a 450 hp (340 kW) Wright P-1 radial engine. Boeing designation Model 54.
FB-5-27 built, production version. Powered by 520 hp (390 kW) Packard 2A-1500 engine. Boeing Model 67.
FB-6-One built, experimental model with a 450 hp (340 kW) Pratt & Whitney R-1340-B Wasp engine. Boeing Model 54.