Lilly Impeller, free after Jay Harmans drawings
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CAD files are readily accessible. I really appreciated the design of that patent, and so I attempted to create a model based on it, without any specific goal in mind - just as a modeling challenge to test my skills...\nHere's the link to the patent:\nhttp://www.rexresearch.com/harmanprop/harmanproppropulsion.htm
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