Pomilio, Ottorino · New York, McGraw-Hill · leaf 362
16 20 24 2& 32 36Radii -in Inches surface element of the blade, and U is the relative velocityof such a blade element with respect to the air. Calling I the variable width of the propeller blade, we maymake dS ^ I X dr … Fig. 215. on the other hand, velocity U is the resultant of the velocityof rotation r and of velocity of translation V, of the air-plane. The direction of these velocities being at rightangles to each other we shall have [/2 = 0,2 X r2 + F2 348 AIRPLAXE DESIGN AND CONSTRUCTION therefore (IR = K X…
Airplanes
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