surely the only RPM that can be refered to is prop RPM, I don't think there is an engine RPM gauge in most of these aircraft, engines can run happily at a range of RPM's but a prop must run within a certain range for efficiency, typically between 2,600 to 3,000, therefore it is more important to know what the prop is doing, certainly this is the case with modern aircraft...engine RPM is practically irrelevent and only fixed pitch non reduction geared aircraft you can assume engine and prop RPM are the same.
jtd is correct that prop and engine RPM are fixed in a ratio but a prop turning at 1500 RPM is not producing much thrust, so it would be more like prop RPM at 2400 and engine is at 3720 with that 1:1.55 ratio, I know were talking 1930/40 tech here but I'm pretty sure the typical aero engine of those days could cope with RPM's that high.
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Last edited by bongodriver; 09-14-2012 at 10:14 AM.
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09-14-2012, 10:00 AM
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