Someone before Me has make diam. smaller its like 13 1/4. Ive "derolled" leading edge away from propnut, more on the root of the blade little less toward tip. Straighten the cup before trailing edge (think cross section) little but then grinded real tight radius on to the trailing edge. Picture show how it goes around tip. Bent blade tip for less rake, helped driveability a lot. Leading edge is sharp and quite thin.
All this was two summers project, do one thing, go out to find not good. Again and again. I think now its really really close atleast if not ready.
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