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Old 09-14-2012, 01:14 PM
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bongodriver bongodriver is offline
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I'm not so convinced, the gauges normally just say RPM and dont apparently distinguish whether it's engine or prop, like I said a prop turning at 1500 rpm is not going to be very useful, I can believe the actual RPM gauge is being driven by the engine itself but I would think the actual calibration on the gauge is for propellor rpm, easy enough to do considering the ratio is fixed so no need for special gears, the manuals may state the engine limits but it may just be that the figures stated are on the basis of prop rpm taking into account the known ratio.
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