Doak VZ-4
Tilting engine exhaust flow is one way to achieve vertical flight, as just discussed; another is to tilt the entire engine, or possibly even the entire aircraft or tilt ducted fans, or even jet engines. The Doak VZ-4 of 1958 had a 3,000 # TOGW and used on Lycoming T53 turboshaft engine driving two 4 ft diameter ducted fans which could tilt through 90°. The overall approach proved promising but was very noisy, the ducted fans at full power sounding like sirens.
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