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Home✈️Aircraft🚁HelicopterAlignT-REX 700N › Will the fuel/oil left in the clutch liner affect performance?
04-01-2010 03:27 AM  10 years ago
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seanball

rrNovice

Osaka - Japan

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Will the fuel/oil left in the clutch liner affect performance?
My trex 700n is lack of pop when doing pitch pump recently. Would it be the cause other than the engine?
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04-01-2010 12:57 PM  10 years ago
AgentOrange

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Jacksonville, Florida

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is it just in that manuver or is it in all the time. Are you into heavy 3d if so does it do it in heavy 3d moves?Trying not to put them in the dirt.
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04-01-2010 01:44 PM  10 years ago
Paul Woodcock

rrElite Veteran

Dubai - United Arab Emirates

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Hi

To check for a slipping clutch, Turn the gov off. Put the machine into a hover while in 3d mode, whack on full power and do a long climb.

If the clutch is slipping, you will hear the motor revving high and the blades will slow down. Do it a few times if you are not sure.....If it is slipping badly, just come off the power and the slipping will stop and rotor rpm will recover.

The final check is to feel the temp of the clutch after doing this. If it is cool, it is ok.

Regards
Paul
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04-02-2010 01:55 AM  10 years ago
Ladymagic

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South Korea

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I'm not really clear on what your heli was doing before, but if it had more "pop" before it could be your clutch, but it really sounds more like a headspeed setting issue or collective/cyclic program issue. Even more simply just engine tuning. I know you said other than the engine, but that's where I would start first. Blade and paddle selection could be another cause.

But, if you really feel like it's the clutch, I would do a complete clutch inspection and cleaning before you make any other adjustments to see if performance improves. If it is your clutch, you'll notice a change within the first few flights. Isolating the cause always seems to be the hardest part. More information would be helpful. How old is your engine? What type of cyclic are you running? What are your headspeed settings? And what was performance like before you noticed this problem?
Mellisa
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04-02-2010 04:37 AM  10 years ago
jschenck

rrProfessor

La Vista, NE.

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+1 check clutch bell temp right after a hard flight. Try doing the pitch pump with lower headspeed (say 1700) if that heats up the bell it's slipping.

Kind of like checking the clutch in a car you are looking at buying. 30mph, rev up the engine and dump the clutch in 4th-5th gear. If the clutch is strong it'll grab.
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