Efficiency of two series of propellers having sections with thickness chord ratios of 0.06, 0.08, and 0.10; R.A.F.-6 sections gave about same maximum efficiency as Clark Y propellers and were more efficient for conditions of climb and take-off.
Comparison of full-scale propellers having R.A.F.-6 and Clark Y airfoil sections
Nat. Advisory Committee Aeronautics -- Report
1931
20 pages
20 Figs.
Report
English
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