The Piasecki H-21 Helicopter: An Illustrated History of the H-21 Helicopter and Its Designer, Frank N. PiaseckiThe only comprehensive illustrated history of Frank N. Piasecki and his H 21 advanced technology helicopter. The Piasecki H 21 became the first successful tandem rotor cargo helicopter to enter mass production. Its innovative and unique design became the basis for the development of both the CH 46 and CH 47 helicopters, which remain in service to this day. The book covers the early life of Frank N. Piasecki and the development of his first helicopter,