I am pretty certain George McHenry had a 3 blade warp drive prop on his KR. He
had a hopped up O-235-L2C that he claimed was making 140 HP. He later removed
that engine prop combination and had installed a 160 HP O-320. He was
experimenting with both 3 and 4 blade Warp Drive props for the O-3
The Porkopolis Flying Pig was powered by a (somewhat tired) Continental A65
with a Warp Drive, 58” tapered blade prop, set at about 20 degrees, if I recall
and max engine rpm of 2540. I kept tweaking the angle about .5 degrees at a
time until I got the best top speed which was about 137 kts.
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