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75% power for most aircraft is generally a high end
cruise throttle setting. 65% is considered more of an an economy cruise
setting. It doesn't have anything to do with a percentage of the total
range of a prop rpms from idle to full throttle. You really
need the charts furnished with your aircraft to tell you what is 75% rpm setting
at different altitudes. A wild guess on a C90 would be in the 2400 rpm
range however. roger
----- Original Message -----From: Scott MorganSent: Saturday, August 05, 2006 4:13 PMSubject: [COUPERS-TECH] What RPM is 75% power?----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----Coupers, I have a McCauley CM 7150, IB 90 prop mounted on a C-90 with 100+ hourssince major overhaul. 2400 to 2450 Rpm seems to be the max I can get out of this setup.This is all mounted on a 1967 A2-A. When people refer to fuel consumption as being so manygallons per hour at 75% power , what do they mean?If I take 75% of 2400, I get about 1800 RPM. If I flew at 1800 rpm my fuel consumptionwould be about 4 gph or less. However, this would not do the engine any favors, I'm sure.So, my question is what do they mean, 75% power???Scott
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