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Aviation History
1910
1910 - 0345.PDF
MAY 7, 1910. \fijcm THE MAXIM BIPLANE, (Concluded from page 325.) Three Propellers. intended there- ONE of the most important features of the machine by to minimise is the system of using three propellers. Two of the as far as possi- propellers are mounted on the main spars of the frame, ble the loss while the third, which is much smaller in diameter, is caused by direct driven by the engine. The larger screws revolve their rotation in opposite directions, and are driven by ropes. The through the air. right-hand screw, viewed from behind, rotates in the It will be ob- same direction as the central screw; the other propeller, served, on re- " Flight" Copyright. v ngnt copyrignt. View illustrating the rope drive to the propellers on the Maxim biplane. which has a reverse direction of rotation, has therefore, ference to one a finer pitch and a higher velocity than its mate in order of our photo- to compensate for the gyroscopic effect of the central graphs, which screw. The propellers are two-bladed, and exceedingly shows a pro- thin and light for their size ; in fact, the blades are so thin peller separate- that they would bend if unsupported, and they have, there- ly, that the fore, been trussed by strip steel ties, which anchor their tubular exten - extremities to a tubular extension of the boss. These sion at the boss strips of steel are so arranged that their surfaces have affords a re - approximately the same pitch as the screw itself, it being markably long " Flight" Copyright. Photograph of one of the propellers for the Maxim biplane, with Sir Hiram Maxim standing alongside, which gives some idea of the size of these screws. The trussing of the very thin blades to the tubular sleeve is a special feature of the design. "Flight" Copyright. Sketch illustrating the arrangement of the jockey-pulleys, which are used to tighten the rope drive of the propellers on the Maxim biplane. 343
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