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On Apr 18, 2:43Â*pm, Bertie the Bunyip wrote:
WingFlaps wrote in news:d33d5865-938c-4cae-acb3- : On Apr 18, 9:20�am, Andrew Sarangan wrote: Even if the airplane is perfectly airworthy, and all maintenance done properly, you don't know if the engine is producing 160HP (or whatever the rated power for your airplane). There is no signature in the logbook that certifies that the airplane engine has been tested and found to produce the specified power. I have flown rentals that flew like a 120HP Cessna instead of a 160 HP. RPM can't tell you the true power because every airplane uses a different pitch prop. Well if the renter is slappin' on any old prop then you should not go there. How does a 120 HP 172 reach cruise airspeed at cruise RPM? Coasely pitched props don't allow good static HP because the RPM doesn't get up to where it needs to be to produce HP. That's what variable pitch props are all about. Yes, but my point is that cruise speed also tells you about HP on a daily basis. As far as I know, there are only a very limited number of approved props for each 172 variant. If you don't see the magic static RPM as specified in the POH it's time to investigate not fly -right? Cheers |
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