United States. Army. Signal Corps · Washington · leaf 79
ee of error allowed, but if there is any appreciable difference the propeller is unfit for use. Surface area.— The surface area of the blades should be equal. Test with callipers. (See fig. 27.) The distance A-B should equal K-L; the distance C-D should equal I-J ; the distance E-F should equal… … the propeller must, of course, be exactly the same distance from the center of the propeller. Camber (i. e.y curvature).— The camber of the blades should — 1. Be equal; 2. Should decrease evenly toward the tips of the blades; and 3. Its greatest depth should at any point of the blade be at about…
Aeronautics, Military
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