Press the button to hear Whirly the Helicopter's wild whoosh whosh.

Study of the lives and work of four Americans--Igor Sikorsky, Frank Piasecki, Arthur Young, and Stanley Hiller, Jr.--who, working independently but concurrently

"Discusses the history, function, and workings of rescue helicopters"--Provided by publisher.

All the essential information and facts the reader must know in order to choose, build and fly radio controlled helicopter successfully, from choice of model an