223 built. - 337C; minor detail changes, 215 built. - 337D; cambered wingtips and minor changes, 100 built. - 337E; increased take-off gross weight, 114 built. - 337F; split airstair entry door, smaller rear side windows, improved flaps, larger front propeller, powered by Continental IO-360-G engines, 352 built. P337G Super Skymaster - 337G; pressurized cabin and turbocharged engines, 292 built. - 337G; minor changes and optional turbocharged engines, 136 built. P337H Pressurized Skymaster - T337G; minor changes, 64 built. 337M - US military version designated O-2 Skymaster in service, 513 built. O-2A - US military designation of the 337M Forward air control, observation aircraft for the US Air Force. 501 delivered to the USAF and 12 to the Imperial Iranian Air Force O-2B: Psychological warfare version for the US Air Force (31 former civil aircraft were converted to O-2B standard). O-2T: Twin-turboprop version of O-2, with two 317 hp (236 kW) Allison 250-B15 engines, a longer span wing and improved high lift devices. O-2TT: Improved twin turboprop forward air control aircraft, with same wing (43 ft 0 in (13.11 m) wing and engines of O-2T but with new forward fuselage with tandem seating for pilot and observer to give improved view. Summit Sentry O2-337 : Military version. Lynx: Armed military version for the Rhodesian Air Force. T337H-SP Reims Cessna F337E Super Skymaster, 24 built. F337F Super Skymaster, 31 built. F337G Super Skymaster, 29 built. FT337G Super Skymaster, 22 built. F337H Super Skymaster, 1 built. FP337H Pressurized Skymaster, 1 built. FTB337G Milirole; military F337G with Sierra Industries Robertson STOL modifications and underwing hardpoints, 61 built. Lynx : Rhodesian designation for 21 FTB337Gs delivered to the Rhodesian Air Force. Conversions/modifications AVE Mizar - flying car, created by Advanced Vehicle Engineers, was an attachment of Skymaster wings, tail, and rear engine to a Ford Pinto outfitted with aircraft controls and instruments. Conroy Stolifter - an extensive single-turboprop engine STOL cargo plane conversion of the Skymaster. Front engine was replaced with a Garrett AiResearch TPE-331 turboprop; rear engine was removed, and its space filled with an extended cargo pod. Groen RevCon 6-X - test conversion of a Cessna 337 Skymaster airplane. This aircraft conversion tested the theory of using fixed-wing airplanes as the basic airframes for gyroplanes to reduce cost and shorten development time. Summit Sentry - Summit Aviation of Middletown, Delaware re-manufactured existing used 337 airframes into the militarized O2-337 which includes four