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by davepage
4078 days ago
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> The propeller, even at 500 feet over the maintenance area, made only a light flutter, heard just as it approached. http://en.wikipedia.org/wiki/Lockheed_YO-3 The largest source of propeller noise is transonic flow at the tips, so turning the propeller slowly helps significantly. The tradeoff is a larger propeller and more expensive engine installation due to the required gearbox. |
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