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Author Topic: Climb RPM?  (Read 6380 times)

donv

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Climb RPM?
« on: July 30, 2016, 03:05:50 pm »
I always climb at 100% RPM.

However, I seem to read that it is better for engine life to climb at 96%-- yet somehow, that feels strange to me when I actually do it. Does it really make much difference?

Bruce Byerly

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Re: Climb RPM?
« Reply #1 on: July 30, 2016, 07:12:44 pm »
I always climb at 100% RPM.

However, I seem to read that it is better for engine life to climb at 96%-- yet somehow, that feels strange to me when I actually do it. Does it really make much difference?

Don - Helmuth the Honeywell pilot advisor has always claimed the engine and inlet design was optimized for 96% and is most efficient there for climb and cruise.  Then there is all the centrifugal force talk that I won't attempt to quote but blade elongation is minimized at the lower rpm.  I do recall my but at 26,000 in the ice in a heavy -5 and 100% seemed helpful. I think.

Steve binnette

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Re: Climb RPM?
« Reply #2 on: October 14, 2016, 12:19:29 am »
I use both settings.

100% when it's just me or there is an actual operational need, otherwise I use 96% to keep the sound down for the passengers.

nrosoff

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Re: Climb RPM?
« Reply #3 on: October 29, 2016, 10:57:35 am »
I use a compromise.  100% for initial climb, 98% climb to my cruise altitude (the climb rate gets to slow bellow that) and 96% during cruise.