Formed in 1946 from the P-V Engineering Forum which had completed several rotary-wing contracts for NACA and the U.S. Navy. The latter ordered an XHRP-1 helicopter which flew in 1945; following successful tests it was placed in production. Further orders followed for XHJP-1 tandemrotor helicopters for USN shipboard operations and the large XH-16, which had a fuselage of DC-4 size. In 1956 the company became Vertol Aircraft Corporation.

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