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John Cooper wrote: > I don't know where you get that idea from. The TCDS clearly > states "Engine Limits: For all operations, 2275 RPM (75 hp)." > Further more, the static RPM limits prohibit use of a prop that > would allow operation significantly above 2275 in all > circumstances except a dive. John, Here's a thought that might contradict your assertion above: The C-85 on a Coupe with a 1A90 prop has the middle of the static rpm range at about 2125. Yet most planes can reach 2575 at full power in level flight. That's about a 450 rpm gain from static to full speed. But the top end of the static range on the C-75 is 2100. It would lead me to believe that the prop/engine combination *could* reach 2400 or 2500 at max power, delivering over allowed power. But, if the engine/prop combination delivers 75 hp at 2275 rpm at sea level, then that prop which gives static rpm of 2100 would almost certainly be able to cruise at 2275 rpm, delivering 75 hp and a good cruise at 1260 lb. Since we rarely cruise at sea level, the power is reduced a little or a lot from 75 hp, even if we were to cruise at 2275 rpm, so, maybe we wouldn't be running the power over what the engine can handle. (That engine is identical to the C-85 and 75% of 85 hp is 63.75%) What do you think? Ed Burkhead http://edburkhead.com ed -at- edburkhead???.com (change -at- to @ and remove "???") ============================================================================== To leave this forum go to: http://ercoupers.com/lists.htm
