THE MULTIPLE AIR PROPELLER. ITS AERONAUTIC POSSIBILITIES FOR DIRIGIBLE AIRSHIPS AEROPLANES AND HELICOPTERS. 4 Commensurately with Increased Horse-Power. would necessarily be made of metal because it could Three-quarter View of the Hammond Multiple Air Propeller. Side View of Hammond's Multiple Air Propeller. All the moving parts run in ball bearings. The friction is so slight that the pressure of a finger on the THE KIMBALL HELICOPTER IN WHICH THE LIFTING SCREWS CONSIST OF A NUMBER OF SMALL PROPELLERS., scientific american, 1908-10-10
THE MULTIPLE AIR PROPELLER. ITS AERONAUTIC POSSIBILITIES FOR DIRIGIBLE AIRSHIPS AEROPLANES AND HELICOPTERS. 4 Commensurately with Increased Horse-Power. would necessarily be made of metal because it could Three-quarter View of the Hammond Multiple Air Propeller. Side View of Hammond's Multiple Air Propeller. All the moving parts run in ball bearings. The friction is so slight that the pressure of a finger on the THE KIMBALL HELICOPTER IN WHICH THE LIFTING SCREWS CONSIST OF A NUMBER OF SMALL PROPELLERS., scientific american, 1908-10-10
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