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The manned Gyrodyne Rotorcycle program of the mid-1950s provided prototype work for the DASH, and ultimately the Rotorcycle was modified to produce the initial drone version, the DSN-1/QH-50A The DSN-1 was powered by a Porsche YO-95-6 72 hp piston engine and carried one Mark 43 homing torpedo.
The XB-16 was to use four Allison V-1710 liquid-cooled inline engines; contemporary American aircraft used air-cooled radial engines.
The Douglas DC-4 piston aircraft with four propellers had made its first flight in 1945 and had 20,835 airframe hours.
Brake specific fuel consumption, fuel efficiency within a shaft reciprocating engine