as trainers. Later modified as part of Project FOX, for use as radio-controlled target aircraft. Model 83 One prototype with spreader-bar landing gear and 425 hp Pratt & Whitney R-1340-8 engine, later designated XF4B-1 for Navy evaluation. Model 89 One prototype with split-axle undercarriage and provision for a 500 lb bomb on ventral rack, later designated XF4B-1 for Navy evaluation. Model 100 Civil version of the F4B-1 with upper wing tank, four built. Model 100A Two-seat civil version for Howard Hughes, later converted to a single-seater, one built. Model 100D One Model 100 temporary used as a P-12 demonstrator. Model 100E Export version of the P-12E for the Siamese Air Force, two built, one later transferred to the Japanese Navy under the designation AXB. Model 100F One civil variant of the P-12F sold to Pratt & Whitney as an engine test bed. Model 218 Prototype of the P-12E/F4B-3 variant, after evaluation sold to the Chinese Air Force. Model 256 Export version of the F4B-4 for Brazilian Navy, 14 built. Model 267 Export version for Brazil with an F4B-3 fuselage and P-12E wings, nine built. Operators Brazilian Air Force Chinese Nationalist Air Force Philippine Army Air Corps Spanish Air Force Royal Thai Air Force operated Boeing 100E variant. United States Army Air Corps United States Navy United States Marine Corps Aircraft on display 31-559 – P-12E on display at the National Museum of the United States Air Force at Wright-Patterson AFB near Dayton, Ohio. 32-017 – P-12E on display at the Planes of Fame Air Museum in Chino, California. This airframe is painted as an F4B-3. 32-092 – P-12F on display at the National Naval Aviation Museum in Pensacola, Florida. This airframe is restored to look like an F4B-4 and painted with the markings of Fighting Squadron 6B "Felix the Cat". 9241 – F4B-4 on display in the "Sea-Air Operations" Gallery at the National Air and Space Museum in Washington, D.C. (Currently in storage due to ongoing renovations at the museum). 1143 – Model 100 on display at the Museum of Flight in Seattle, Washington. 1488 – Model 100E on display at the Royal Thai Air Force Museum in Bangkok. Replica – A 3/4 scale replica P-12F is on display at the Tennessee Museum of Aviation in Sevierville, Tennessee. Replica – A 3/4 scale replica F4B-4 is on display in the entrance hall of the Honolulu International Airport. Specifications (P-12E) See