Full-Scale Tests of Metal Propellers at High Tip Speeds (1932)
NASA Technical Reports Server (NTRS) · leaf 13
12 REPORT NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS The fact that the C series propellers are about 6 per higher pitches where the L/D ratio is a less important cent more efficient than the R series might be taken factor than it is at lower pitches. In fact the R pro- … .05 V Fir.i-RE 18.—Power coenricient vs. ^^jy Propeller R-8 set 9.6° at 0.7572. wTlli that speed at wliich 6V begins to drop and Cp .0-4 to increase rapidly. Above this ''critical speed'' there is first a gradual drop in efficiency shown by the bend .03 in the curves (figs. 31 to 33, inclusive) and…
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