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HelicopterThunder TigerOther › Raptor 50 V2 Clutch problem
06-06-2004 11:12 PM  13 years agoPost 1
Zilly

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UK

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I have put about 2 gallons of fuel through the Raptor V2 / OS 50 and it has been fine to date, spent 2 hours at ATS (local heli school) yesterday having another lesson on my Heli and getting things trimmed up a bit now the engine is run in more.

Today I flew a couple of tanks then decided to stop and check the mixture settings, when I put the starter shaft back in to start it there a horrible rough noise and the whole thing shook.

I then noticed that you could only turn the blades clockwise and if you tried anti clockwise there was a rough scraping noise from around the clutch area.

I packed up and went home and proceeded to remove the engine, expecting a mangled clutch or at least a seperated liner. Both looked fine to my untrained eye so i checked a few other things such as the start shaft having no vertical play it was then that i noticed the clutch bell was marked around its top inner face and it appears that the top of the clutch was binding against this I put the engine back in after cleaning out any dust in the clutch bell and again it was binding. The clutch itself is fine no hairline cracks. I spoke to one of the guys at ATS who suggested I remove the engine again and check the fan had not loosened which I did and no it was still very tight I re attached the clutch after checking. Finally I loosened the nuts that hold the engine to the cradle and re tightened holding the engine tight against them downwards. There is virtually no play in the cradle to engine screws so I did not expect this to have any effect.

I then re assembled and this time it was ok no rubbing I ran the heli starting it up a few times to ensure it did not re occur and it seems fine.

Anyone had similar experiences?

Is it likely to happen again?

How do I stop it???

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06-06-2004 11:26 PM  13 years agoPost 2
Al Magaloff

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12,199 Posts- Enough Time Wasted. See Ya!

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The fan IS coming off. The nut may be tight, but that means nothing. The fan is threaded to the crank shaft. Pull the motor again, take off the nut, and you will find the fan to be loose. Guaranteed. The next time you flood the motor, the starter will back the fan off some more.

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06-06-2004 11:27 PM  13 years agoPost 3
Drunk Monk

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Preston, UK

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I've only had that when I left the washer between the engine and fan. Shouldn't be there if it is otherwise the clutch sits too high and rubs on the clutch bell


Stephen

I only open my mouth to change feet.....

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06-06-2004 11:29 PM  13 years agoPost 4
l337hxr

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Irvine, CA

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yup it happened to me few weeks ago......the fan backed out and pushed the clutch against the bell housing which locked up everything! i couldn't even turn the blades properly.

locktite the bolt that screws the fan onto the engine shaft. and bolt it down good. now it seems okay...no more backing out.

yea like drunk monk said, dunt use teh washer if you have the washer on there. TT dude on the phone told me to take that useless washer out when i first bought the tt50.

SceaduEvo50, FF9

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06-06-2004 11:56 PM  13 years agoPost 5
Zilly

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UK

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I I tried to tighten the fan with the crank locked and it would not budge, i cant tighten it any more!!

Z

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06-07-2004 03:02 AM  13 years agoPost 6
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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Z, did you remove the nut first?
.

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06-07-2004 03:29 AM  13 years agoPost 7
clearsky

rrApprentice

connecticut

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Z,

Just fixed same problem.As has been posted remove washer
between fan an engine,in my case the washer was black in color.

Keep'um in sight

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06-07-2004 04:04 AM  13 years agoPost 8
Tripen2

rrApprentice

Back in Tucson, AZ

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Pull out your main gear and take a look at the one-way bearing. a friends raptor 90 upgraded one-way bearing gave out yesterday on him.

Mike

16hrs to build 30secs to crash
Raptor 90
Raptor 50V2
Trex, HB CP

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06-07-2004 04:39 AM  13 years agoPost 9
Bruce Elder

rrNovice

Utica, Kentucky USA

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Your Clutch is more than likely the problem, I have the same problem right now on My Raptor50V1, The one way bearing is the problem.
Check it out you will more than likely see that it has a lot of slop were the starter shaft inserts into the one way bearing. Yow will need to replace the clutch and the clutch liner.
Happy flying
Bruce

Raptor 50v1
Raptor 50V2
Raptor60V2
Freya 91
Freya Xspec

Fly as often as you can and repair the rest of the time, Pre flight checks are a must!!

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06-07-2004 09:18 AM  13 years agoPost 10
drsuessmn

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Ellendale Minnesota USA

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I've only had that when I left the washer between the engine and fan. Shouldn't be there if it is otherwise the clutch sits too high and rubs on the clutch bell
i just had the same problem with my 30 v2 and it was a washer you need to remove engine remove nut remove fan remove any washers or shims crank down fan tightly crank down nut tightly (use loctite) and reinstall engine also check for damage as Janek stated

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06-07-2004 10:30 PM  13 years agoPost 11
Zilly

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UK

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Thanks for the advise guys the fan was loose which certainly caused the problem however the washer was also there so even though with the washer in place there was no scraping I removed it to be sure and re tightened the fan loctiting it to the crank then loctited the nut on as well and torqued it up as much as I dared so hopefully it won't happen again.

Z

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HelicopterThunder TigerOther › Raptor 50 V2 Clutch problem
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