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Tests of Large Airfoils in the Propeller Research Tunnel, Including Two with Corrugated Surfaces (1930)
NASA Technical Reports Server (NTRS) · leaf 12
.28 .8 .28 16 /6 .6 .24 .6 .24 12 12 .4 .20 .4 .20 8 8 .2 .16 .2 .16 4 4 0 . 12 0 0 .12 0 -2 .08 -4 -4 -.2 .08 -.4 .04 -8 -8 -.4 .04 6 0 _/2 -12 -.6 0 8° 12° IS0 20° 24° 28° 32° -8° -4° 12° 16° 20° 24° 28° 32° 0° 4° 8° -8° a cc Figure 19—Effect of different surfaces on characteristics of Clark Y.… … V V cL ~vs V Cx va Figure 21—Comparison curves. Profile drag for constant gross load and Figure 22— Comparison curves. Profile drag for constant gross load and stalling speed. Clark Y airfoils stalling speed. Different airfoils slightly higher lift with considerably greater drag so that the…NASA Technical Reports Server (NTRS)
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