The application of propeller test data to design and performance calculations (1925)
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sing the characteristic curves for the engine. If still greater accuracy is required, a second approxi- mation should be sufficient to give results perhaps more accurate than the experimental data justifies. We may therefore assume that Q, V, p and D are known, so that C4 is known. With a curve of… … 0.0 0.2 0.4 0.6 0.8 t-0 1.2 1.4 1.6 P D Fig. 5.—General efficiency curve for air propellers based on Durand's tests. Note: nm the maximum efficiency, occurs Fig . 3.—Variation of ft with £ and ~. Durand propellers 13 U, 7,3,82, and 113. \nDJ \nD/o
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