low rpm

by thomas spinard in 912 / 914 Technical Questions 13 years ago

recently bought a tecnam p92 with low hrs. powered by 912 uls. on t/o tach reads 5100 climbs out very well.lvel cruise is usually around 4000 rpm. is it caused by to much pitch on prop?

Re: low rpm

by bill martin » 13 years ago

bill martin

10 757 0

If the engine is running well otherwise, it sounds very much like a pitch problem.

Bill.

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Re: low rpm

by Roger Lee » 13 years ago

Roger Lee

128 5.28k 4.98k

Hi Thomas,

I'm a little confused. Are you climbing out at 5100 rpm and then in flat and level cruise the max rpm is only 4000? Climb rpm is usually always lower than WOT flat and level.
If it develops 5100 WOT on climb out and only gets 4000 WOT in level cruise then it isn't pitch or it wouldn't get 5100 on climb out. If this is really the case then a fuel flow issue may be present.
I think we need a little more info.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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low rpm

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