Increased RPM at take off speed or slippage?

Re: Increased RPM at take off speed or slippage?

by william schuller » 10 years ago

william schuller

1 4 0

Conrad,

It is a 912uls 2006 it is on a Flight Design CTSW.

Re: Increased RPM at take off speed or slippage?

by Przemysław Wiśniewski » 10 years ago

Przemysław Wiśniewski

65 247 3

Maybe you have problem with tightness of carburettors? When cold it's takes illegal air. You can check on cold engine by spraying collectors by startup spray.

Re: Increased RPM at take off speed or slippage?

by Conrad Beale » 10 years ago

Conrad Beale

3 66 22

I am fairly confident it is a slipping slipper clutch from what I can hear on the video.
Hopefully the company who did the gearbox service has recorded the slipping torque of the slipper clutch on their worksheet - do you know what the slipping torque was/is?

I can't think of anything else that fits the symptoms of increasing RPM.

However if the RPM is constant and it is just an increase in noise level try looking for a split carb rubber, loose intake pipe, or something similar.

Re: Increased RPM at take off speed or slippage?

by Przemysław Wiśniewski » 10 years ago

Przemysław Wiśniewski

65 247 3

I don't know what rpm indicator you have but most digital gauges has algorithm to average indication. You can not see short rpm peak. If it's digital sometime you can re-program it. Anyway it's clear that you have rpm peak.

Re: Increased RPM at take off speed or slippage?

by Roger Lee » 10 years ago

Roger Lee

131 5.38k 5.44k

Hi Conrad,

That would be my first start too. Gearbox. It's just such an odd issue.

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