Comparison of Full-Scale Propellers Having R.A.F.-6 and Clark Y Airfoil Sections (1932)
NASA Technical Reports Server (NTRS) · leaf 10
lers were derived, and this ^s not the case with the Clark Y propellers. Here the corresponding values of the speed power coefficient the thicker sections actually give a higher efficiency, Cs computed. This coefficient is defined as: although the difference is very slight. CONCLUSIONS where V is… … The power curves, except for the thin propellers, show that the tlark Y sections absorb less power at the high values of V/nD than the R. A. F.-6. This re- sults in the Clark Y propellers having a higher maxi- .3 .4 .5 .6 .7 .6 .9 mum efficiency. This is especially marked at the low- r R pitch…
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