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On 13 Aug 2004 14:10:13 -0500, Todd Pattist
wrote: It's that and the fact that you can't keep on increasing the prop diameter - you run out of ground clearance, exceed material limits or hit the inefficiencies of supersonic tips. As I mentioned, that's why the prop designer came up with such a strange looking planform. The prop is wide where it's most efficient (aproximately halfway out from the hub where the prop speed is way below sonic speed) and can produce the greatest thrust, then narrows down rapidly from that point from both leading and trailing edges, then the leading and trailing edges get to running roughly parallel before they stop abruptly at the tip which is squared off. As I mentioned, since the tip is moving the fastest, it's smart to present very little for the air to get draggy about at that point. Some props have rather wide tips, which get hugely draggy at high rpms, and also produce a lot of noise. This things is very odd looking but produces good thrust while being quieter than most props. Corky Scott |
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