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Piasecki H-16 From Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Piasecki_H-16

The Piasecki H-16 Transporter was a tandem-rotor transport or rescue helicopter designed by Frank Piasecki and built by Piasecki Helicopter initially as the PV-15. The prototypes were evaluated by the US Air Force and US Army, but the crash of the second test aircraft led to cancelling the project.