Circa 1967, bell Aircraft produced a design for a tiltrotor VTOL aircraft that would be quite similar to the V-22 Osprey of 20 years later. the Model 266 had two T64 turboshaft engines, one at each wingtip. Each engine drove a three-bladed prop/rotor that could be tilted to provide vertical or horizontal thrust, with cross-shafts making it so that the aircraft could power both props in the event that an engine were to go out. The overall configuration was much like that of a spindlier V-22 with a conventional tail. The basic role was as a troop transport for the US Army.
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