FAY, JOHN S. - THE HELICOPTER and how it flies.

London. Sir Isaac Pitman, 1955., Reprint (of 1954) "Explains all the fundamental features of rotary-wing flight without resorting to mathematical formulae.....vertical & forward flight, torque, balance, stability, gyroplanes, delta-three hinge, Coriolis effect ... " etc. 105 pages including index. 112 drawings & diagrams by Lucy Raymond. Near fine apart from faint foxing on endpapers. D./w. is slightly worn and torn. Top front corner is missing, bottom front corner is torn, a piece (1" x ½" ) is missing from bottom of spine. 1955

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