This is an illustrated history of Frank N. Piasecki and his, at the time, advanced, unique and innovating tandem-rotor H-21 helicopter.

This aviation handbook is intended to provide the reader with a quick reference to the major types of military jet aircraft and helicopters flown by the Royal C

The helicopter came on the scene too late to play other than a minor role in the Second World War but by the Korean conflict the Bell H-13 Sioux, OH-23 Raven, a

During the early stages of helicopter development, when helicopters were able to lift just slightly more than their own weight, the military services were eager