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Aviation History
1943
1943 - 1043.PDF
THE FIRST KNOWN CONTRA-ROTATING AIRSCREW WAS CONSTRUCTED BY MM. LAUNOY & BIENVENU IN 1784 AND WAS DESIGNED TO PROVIDE LIFTING POWER' ...... THE BLADES CONSISTING OF FOUR FEATHERS TO EACH SCREW. * ONTRA-ROTATING PROPELLERS ULTIMATE PROPELLER EFFICIENCY TO- DATE IS THE ROTOL, CONTRA-ROTATING CONSTANT SPEED' DESIGN . . . THE MOST POWERFUL AERO ENGINES OF TO-DAY DEMAND THIS PROPELLER TO CONVERT THEIR IMMENSE POWER INTO EFFECTIVE TRACTIVE EFFORT ....
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