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This is only true if you are running at (in my O-320) 2,700 rpm. I do about 75% power at 6,500 at full throttle because I am using 2,350 rpm. The 75% rule applies for sure to fixed pitch props that are running at 2,700 rpm at 7,500 msl at full throttle.
From: "Paul Lipps" <elippse@sbcglobal.net>
The old rule about 75% power at full throttle at 7500'-8000' with a normally aspirated engine is only true for slower airplanes. If you're getting good ram pressure recovery, the 75% power altitude for a TAS of 200 mph is 9500', and at 250 mph TAS, it's 10,500'. We're actually getting more power because of our higher speed than we originally thought we were getting!
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Lorn H. 'Feathers' Olsen, MAA, DynaComm, Corp.
248-345-0500, mailto:lorn@dynacomm.ws
LNC2, O-320-D1F, 1,100 hrs, N31161, Y47, SE Michigan
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