Comparison of Tests on Air Propellers in Flight with Wind Tunnel Model Tests on Similar Forms (1926)
NASA Technical Reports Server (NTRS) · leaf 11
drag is numerically equal but opposite in sign to IF sin a. True drag is apparent drag plus thrust, and thrust is derived from the thrust coefficient V of a model propeller for the value of ^ attained in the ghde test, it l)eiiig rarely possible to V realize the exact ^ for zero thrust (0.972 for… … Cd Ancjle of attack Fig. 11.—Polar diagram of Voutilit VE-7 airplaiio Fig. 12.—Lift characteristic of N'ouglil \"K-7 airplane The final coefficients Cl and Cr>, plotted as a polar diagram, are show^n in Figure 11, a curve representing a reasonable estimate of the average of points being drawn. In…
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