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HomeAircraftHelicopterAlignOther › noise spool up
03-10-2008 03:05 AM  10 years agoPost 1
floop

rrVeteran

Southern, NJ

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This has been going on for a while:

Occasionally on spool up I hear a metal grinding noise and the motor revs but the blades don't spin up. All I have to do it Throttle down and then back up and it is fine. I can fly and do hard tic-tocs... etc no problems.

Pulled engine for bearing replacement and put everything back in a month ago.
Replaced oneway bearing. Last week. (The noise changed a little)

Is it the oneway?

Thanks

IT's what I do.

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03-10-2008 03:08 AM  10 years agoPost 2
george0079

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USA

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Sounds like you engine may be starting backwards.

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

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03-10-2008 03:12 AM  10 years agoPost 3
jackheli

rrProfessor

Vancouver - Canada

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Do you have a pro or a sport?

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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03-10-2008 03:12 AM  10 years agoPost 4
floop

rrVeteran

Southern, NJ

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Don't think it is the engine. It happens as I am spooling up and I just need to go to idle and then back up to get it to stop.

IT's what I do.

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03-10-2008 03:13 AM  10 years agoPost 5
floop

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Southern, NJ

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It is a sport.

IT's what I do.

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03-10-2008 04:55 AM  10 years agoPost 6
Simmer

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Massachusetts

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Well when I had my heli not spool up I dropped throttle then back up and it changed direction and spooled up. You may not hear or notice the engine changing direction but it very well could be starting backwards. I think this could be a mixture setting too rich maybe or maybe you starting it spinning it the wrong way?

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03-10-2008 02:27 PM  10 years agoPost 7
floop

rrVeteran

Southern, NJ

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The noise happens as I spool up. Might be 20% throttle with the blades spinning and then something slips and the noise starts. Then the blades stop spinning up but the motor does go faster.

If I then throttle down to idle and spool back up everything is fine.

I'm thinking it is either the fan mount slipping or the oneway. But both those things have been taken apart and replaced and it still does it.

Other ideas?

IT's what I do.

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03-10-2008 03:35 PM  10 years agoPost 8
Simmer

rrElite Veteran

Massachusetts

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hmm dont think the one way would do this, when it goes it locks up with? Your suggesting that the oneway is not engaging at all. I think clutch area, shoes, something spun loose.

Pull that motor and go over the fan clutch area. There is a pin bearing in the fan area maybe that is gone south. (with apologies to those in the south
)

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03-10-2008 05:24 PM  10 years agoPost 9
jackheli

rrProfessor

Vancouver - Canada

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I have a sport too, and the noise comes from the belt hitting the boom.

Try moving the rudder stick while the heli is still on the ground to see if the noise goes away.

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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03-10-2008 09:37 PM  10 years agoPost 10
floop

rrVeteran

Southern, NJ

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jackheli: its not the belt because the main blades will not spin up.
Simmer: I think the oneway on the clutch only engages for the starter coupling.

It is most likely the main shaft oneway slipping

IT's what I do.

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03-10-2008 09:49 PM  10 years agoPost 11
shuttlepilot

rrElite Veteran

Mullins, South Carolina

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It is most likely the main shaft oneway slipping
I'm not a 600n flyer, but I have seen this happen on other brands of heli also. So, I also vote for the one way on the main shaft as the culprit.

Gas is Great
Camper Fuel is Better!!
QWW Helis

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03-10-2008 10:49 PM  10 years agoPost 12
Simmer

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Massachusetts

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floop thats right sorry missed that one.

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