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"David CL Francis" wrote in message
... The extreme of this is the enclosed fan where the enclosure markedly reduces tip losses. The fan runs nicely along like this with a high blade area and little daylight visible through the disc. Whatever happened to the concept of piston engines running a ducted fan? That aerocar thing has them, but what about on other more normal planes? How efficient is a ducted fan compared to a prop? I seem to remember hearing in model aircraft settings, a prop is more efficient. Paul |
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