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Was cooling fan, now clutch trouble ?

Old 02-01-2007, 09:11 PM
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bshaf
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Default Was cooling fan, now clutch trouble ?

Put a new aluminum cooling fan on yesterday. Took it out to fly today. Engine rev's but blades don't spin. Like the clutch is not grabbing. Could I have put on fan too tight keeping the clutch arms from spinning out or is there something else I need to check.

Last time I flew with the plastic fan all was good,

Thanks
Bob
Old 02-01-2007, 10:16 PM
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bshaf
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Default RE: Was cooling fan, now clutch trouble ?

Took the fan off. How much gap should be between the clutch and the lining ? Got about .010" there. Lining looks to be about .050" or so thick. This is my first heli so I don't know. Looks like if I did tighten it to much it could stop the arms from spinning out to grip the lining. Will put it back together not so tight.

Anyone have this trouble ?

Bob
Old 02-02-2007, 02:53 PM
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BarracudaHockey
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Default RE: Was cooling fan, now clutch trouble ?

Was the engine running backwards?
Old 02-02-2007, 05:56 PM
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Default RE: Was cooling fan, now clutch trouble ?

bshaf

I think BHockey has it right. If your engine is set overly rich (or in cold weather), it can start backwards. Then your auto bearing in the maingear will freewheel and the mainrotor will not turn. Did your tail rotor turn but not mainrotor?

Also, if your motor runs backwards your fan top etc. can easily unscrew.
Old 02-02-2007, 08:14 PM
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bshaf
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Default RE: Was cooling fan, now clutch trouble ?

At idle the blades & tail rotor did slowly turn, but reving the engine up the blades would not go faster. I will check bolts/set screws to see if something came loose and a gear is slipping on a shaft. Any ideas ?

Thanks
Bob
Old 02-02-2007, 08:34 PM
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bshaf
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Default RE: Was cooling fan, now clutch trouble ?

I forgot to answer the question about engine running backwards. Don't know, didn't know a heli could run backwards when started with a starter. But I don't know anything about heli's
as you can tell. It was getting dark so I didn't look things over as good as I should have.
Will put it together and try again saturday.

Bob
Old 02-03-2007, 01:58 PM
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bshaf
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Default RE: Was cooling fan, now clutch trouble ?

OK I got it, had my head up my tailrotor or I would have seen it when I put the fan in. The top part of the fan was rubbing on the inside of the fan area. Bogging the engine down.
I cut that top ring off, runs great now.

Thanks for the help
Bob

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