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RE: .........I guess I'm stuck with it. $16,000.00 ceiling fan?...
Not necessarily.
I'm not familiar with the particular 550 (520?) you're using, but IF your crankshaft has the ARP-880 hub (8 9/16" bolts, 2 1/2" dowels, 4.250 BCD, same as used on PT-6, TPE-331, and SOME GTSIO-520's) it will bolt on and control properly.
There is a potential issue with blade efficiency since that prop was designed to operate at around 2200 takeoff and lower for cruise.
There is another potential issue with blade retention at above 220 RPM (2700 takeoff?).
MT (Michael) is the best source of info on those questions
If those two issues are not critical, AND if you DON'T have the ARP-880 prop flange, we could certainly build you an adapter to fit that prop onto your crank.
Jack Kane
EPI, Inc.
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