One of the first attempts to relate the development of rotorcraft, both helicopters and autogiros, in Allied countries during the WWII period. American, British, French and Russian rotorcraft are included. The book describes and illustrates the development and evolution of rotorcraft and contains: scale plans, photos and drawings from Technical Manuals, superb color illustrations of camouflage and markings, walk-around color photographs and b+w archive photographs. Essential reading for aviation enthusiasts & scale aeromodelers.