1943

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First jet-propelled rotor helicopter town, the Austrian Doblhoff No. 1.

During 1942-43: Cal Tech studied pumping of liquid rocket propellants, particularly nitric acid, resulting in successful design in 1945, which was set aside for future use because of decision to concentrate on gas-pressurized fuel systems.

Mid-1943: Navy Initiated development of FR "Fireball" fighter, the only U.S. Jet-and-propeller engine fighter produced in any quantity before the end of the war. Developed by Ryan, prototype was accepted in October 1944 and production authorized in December 1944.

Summer 1943: Messerschmitt Me-163B rocket interceptor powered by Walther "hot" engine successfully flown at Bremen, Augsburg, and near Leipzig, Germany. Over 300 Me-163B's were produced by Junkers by the end of 1944.