Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 210
asses of it at practically the sametime to gain the thrust needed to propel the aero-plane swiftly, and this led to increasing the diameterof the propeller to secure action on a proportionallylarger area of air. The principle involved is simplythe geometric rule that the areas of circles are toeach… … 210 FLYING MACHINES: MOTORS. part of a propeller has practically no thrust elTect,the efficiency of the 8-foot propeller is nearly twicethat of the 6-foot propeller—other factors beingequal. But these other factors may be made to varywidely. For instance^ the number of revolutionsmay be increased…
Aeronautics
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