Experiments in External Noise Reduction of ... - CAFE Foundation
Experiments in External Noise Reduction of ... - CAFE Foundation
Experiments in External Noise Reduction of ... - CAFE Foundation
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NACATN 2079 115ConfigurationConfiguration1 ———. _._. ——— 23? —-- —--2A—-—- 2C —————2B— ——— — 2D —--- —--- —8,uNosen.,Leftw<strong>in</strong>gRightw<strong>in</strong>gISound level <strong>in</strong> db referred to 0.0002 dyne/cm2Figure 36.- Comparative polar plot <strong>of</strong> propeller fundamentals from data takenon ground 50 feet from hub. Six configurations. Refer. to table II for eng<strong>in</strong>epower, tip spee-d, and propeller diameter.. . .. . . . ... .— .._ .._ _______ ___ ————._ —.-—————.—.—. ———. -..
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