Piasecki Helicopter

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The Piasecki Helicopter Corporation (later Vertol Aircraft Corporation) was a designer and manufacturer of helicopters in the late 1940s, and thoughtout the 1950s.

The Piasecki Helicopter Corporation was founded in 1940 by Frank Piasecki as the P-V Engineering Forum, first becoming known as Piasecki Helicopter in 1946. The PV-2 was the second helicopter flown in the United States (following Igor Sikorsky's VS-300) and was designed and flown by Frank Piasecki in 1943.

Piasecki designed and successfully sold to the US Navy a series of tandem rotor helicopters, starting with the HRP-1 of 1944. The HRP-1 was nicknamed the "flying banana" because of the upward angle of the aft fuselage that ensured the large rotors did not hit each other in flight. The name would later be applied to other Piasecki helicopters of similar design. In 1949, Piasecki provided the CH-21 Shawnee to the USAF, which was an improved, all-metal derivative of the HRP-1.

In March 1956, the company was renamed the Vertol Aircraft Corporation. It was acquired by Boeing in 1960 and renamed Boeing-Vertol. It became the Boeing Helicopter Division in 1987.

After the Boeing acquisition, Frank Piasecki reformed his company as Piasecki Aircraft Corporation (PiAC) to pursue the development of compound helicopters and other rotorcraft.