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Old 07-14-2012, 04:31 PM   #5
Dave
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Join Date: Jan 2006
Location: Vermont
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Interesting patent. I've got some Spencer Heath (Paragon) documents from the late teens or early twenties that discuss the variable pitch/thrust relationships with respect to thrust, but I'm not aware that they ever applied for a patent for it, although they did advertise that their more scimitar shaped props would provide that feature.
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