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HomeAircraftHelicopterHIROBOOther › Clutch always engaging!
03-30-2005 05:19 PM  13 years agoPost 1
sir777

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Moscow, Russia + Lloret de Mar (Girona), Spain

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Hello everybody! I have a sceadu and a new os 50 hyper engine. I have about 10 tanks on this motor (8 motors working on 10-15% throttle and 2 real flights). And the problem is that no matter how low I put the lowest point on the throttle curve (I mean, the lowest possible to let engine running) , the clutch always engages and blades start to rotate (very slowly). What it can be? I had a new clutch with liner, but an old bell, which worked well on my previous engine (clutch wasn't engaging all the time)- irvine .39h.

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03-30-2005 05:28 PM  13 years agoPost 2
Jeff H

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Cincinnati, OH

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I had a new clutch with liner, but an old bell, which worked well on my previous engine
If I am reading this right, you put a new clutch in an old clutch bell. If that is the case, there is a good chance that the clearance between the clutch and bell was too much and you sprang the clutch. Answer: replace clutch and liner.

OR, you might have too small of a gap between the clutch and liner causing it to engage at to low a setting, at this point, about the only thing you can do is live with it until it gets some wear on it (a hot start will help with this ) or chuck the bell in a lathe and cut a couple thousanths out of the liner.


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03-30-2005 05:32 PM  13 years agoPost 3
airdodger

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Johnston USA

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Hi, you need to measure the clutch and the bell, its sounds like the clearance is too tight. Chris

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03-30-2005 05:41 PM  13 years agoPost 4
sir777

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Moscow, Russia + Lloret de Mar (Girona), Spain

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I am sorry, but I don't understand some things, because of my bad english. And I have problems with terminology. Look, I had a 30 class engine, then converted my heli to a 50 class. For that I bought a new flywheel (actually, I bought a blue sd-g flywheel), new clutch with new liner (this one have another number of teeth) and some other things like blades and muffler. I used an old bell. It flies excellent, just engaging all the time. Maybe I should really give it some more time to "break in"?

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03-30-2005 05:47 PM  13 years agoPost 5
Tek

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Yukon, OK USA

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I think you have it backwards since it should have used the new fly wheel, new bell and the old clutch after the upgrade. Check your throttle linkages to make sure that it fully closes and fully opens.

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03-30-2005 05:48 PM  13 years agoPost 6
sir777

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Moscow, Russia + Lloret de Mar (Girona), Spain

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With which instrument I can measure this clearance? I have some calipers, but I think, that they are only up to 1mm. And it will be real pain to pull out my engine assembly now, because I (stupid!) stripped the set screw in the starter coupler!

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03-30-2005 05:49 PM  13 years agoPost 7
Tek

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Yukon, OK USA

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03-30-2005 05:50 PM  13 years agoPost 8
sir777

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Moscow, Russia + Lloret de Mar (Girona), Spain

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Tek, I am not sure, that I understand you correctly. I have my throttle linkage set-up correctly, so it fully closes and fully opens. What can be backwards? Please explain.

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03-30-2005 05:51 PM  13 years agoPost 9
Leif

rrElite Veteran

USA

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You might be using the wrong terms... thereby confusing everybody.

The "clutch bell" is the aluminum part that has the liner glued into it. You should have received a new one as part of your '50 upgrade, as this part is mated to the pinion gear.

The "clutch" is the metal shoe piece (with shaft) that you bolt to the flywheel attached to your engine. You replaced the flywheel to move up to the '50.

Either it's dragging because the liner is new, or the clutch might be expanded from use with a worn liner in your old clutch bell. A more likely cause might be that the OS50 engine is not really idling. It's a larger engine, so what sounds like an idle to you might be running fairly fast. This might just be an engine set-up issue.

Leif

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03-30-2005 06:04 PM  13 years agoPost 10
sir777

rrApprentice

Moscow, Russia + Lloret de Mar (Girona), Spain

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Yes, you are right! I am sorry for confusing you. I have a new clutch bell with NEW liner and a old clutch.

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03-30-2005 06:07 PM  13 years agoPost 11
Tek

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Yukon, OK USA

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Thanks for cleaing it up Leif. I was to lazy to type it all out.

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03-30-2005 06:14 PM  13 years agoPost 12
sir777

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Moscow, Russia + Lloret de Mar (Girona), Spain

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So what should I check first? I am a bit confused at the moment, cause it can be an engine set-up and it can be a worn clutch. How I can see, that the clutch is worn? I really don't want to pull the engine out, but I have no chances so far...

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03-30-2005 06:22 PM  13 years agoPost 13
Tek

rrVeteran

Yukon, OK USA

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Engine set up is to double check the linkages and make sure your low speed needle is where it is supposed to be.

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03-30-2005 06:37 PM  13 years agoPost 14
sir777

rrApprentice

Moscow, Russia + Lloret de Mar (Girona), Spain

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To double check the linkages- you mean to check, that they fully open and fully close? And how do I know where my low speed needle supposed to be: it is just a bit leaner than factory setting and I can count to 4 until engine starts to accelerate after pinching a fuel line.

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