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HelicopterAlignT-REX 700N › Clutch issues?
04-06-2011 04:29 AM  6 years agoPost 1
robv

rrApprentice

SoCal

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How many pilots are having or have faced the issue with their clutch breaking within a few tanks due to having a big gap between the liner and clutch?

I went through two clutches recently. After the first clutch failure, I replaced the clutch and the clutch bell (which had the liner preinstalled). Yes, I was too lazy to change the liner on the old bell and didn't mind paying a little extra for the preinstalled liner. Anyways... That clutch broke after about 5 tanks.

Has anyone found a way to resolve this problem? TT blue liner? QUK clutch? How about shimming the stock liner with some paper to close up the gap a lil?

Team JR | Gens Ace | YS Engines | Scorpion Motors | Pure Tech

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04-06-2011 04:57 AM  6 years agoPost 2
bhoff

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houston texas

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happened on mine too after about 5 tanks to the previous owner i bought it like this so im changing it out..i just ordered a LYNX clutch liner ill get back to you on how it works

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04-06-2011 05:12 AM  6 years agoPost 3
baby_zyklon

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Singapore

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I am still on the same clutch and liner after more than 200 flights and a couple of hot starts, including one that caught me by suprise and had smoke coming out from the bell...

There is a new blue liner from align. Perhaps that might help?

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04-06-2011 05:54 AM  6 years agoPost 4
McKrackin

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Lucasville,Ohio

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I had to replace the liner from a hot start.
The stock replacement wouldn't even go over the clutch.
I had to turn it down to near paper thin to get it on and it still is a bit grabby at an idle.

I can't imagine how thin your liner would have to be to get a large gap.

I literally never use the word literally right.

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04-06-2011 06:06 AM  6 years agoPost 5
robv

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SoCal

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I had to turn it down to near paper thin to get it on and it still is a bit grabby at an idle.
Wow, that doesn't sound right.

Team JR | Gens Ace | YS Engines | Scorpion Motors | Pure Tech

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04-06-2011 06:18 AM  6 years agoPost 6
McKrackin

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Lucasville,Ohio

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It's true.
My clutch liner is about 1.3 mm thick and will just barely go on over the clutch.

The blades are trying to turn at even a slow idle.

I literally never use the word literally right.

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04-06-2011 07:06 AM  6 years agoPost 7
robv

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SoCal

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Which liner are you using? Align liners are 1mm thick.

Team JR | Gens Ace | YS Engines | Scorpion Motors | Pure Tech

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04-06-2011 09:03 AM  6 years agoPost 8
Paul Woodcock

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Dubai - United Arab Emirates

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Hi guys

I have 2 nitro 700's and 'fixed' the clutch as i was building them. The gap was just too much for my liking. I would rather just fix it and have no issues than have issues and then fix it..... A big clutch gap will never work properly.

The first one, i did the 'Coke can mod' and removed the liner and glued in a strip of a Coke can and a new liner.

The second one, i tried the Lynx gasser liner. It is about 1,3mm thick.

Both methods ended up giving the same result. The motor can idle with no dragging on the clutch and when i open the throttle just a little over idle, the clutch starts engaging. I am happy with both, but would go with the Lynx gasser liner when i need to replace liners. It is just simpler, and i have one...... It also gave a little tighter gap. I was worried it would be too tight and cause dragging at idle, but it didn't.

If i didn't have a Lynx Gasser liner, or couldn't find one, the Coke can mod works well. The Coke can was about 0,1mm thick after i sanded the 'paint' off. I would look for a thicker material. 0,12mm would be better.

Regards
Paul

PS: To remove the 'old' liner put the clutch bell in a bowl of acetone that is just enough to avoid wetting the bearing. Wait about an hour or two and the epoxy will be soft enough to get the liner out. Drop it in the acetone again for an hour or two and the epoxy will be gone.

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04-06-2011 12:10 PM  6 years agoPost 9
baby_zyklon

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Singapore

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mckrackin, did you apply a layer or two of vinyl tape around the clutch and insert the whole clutch assembly into the bell while glueing the liner in?

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04-06-2011 03:12 PM  6 years agoPost 10
jschenck

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La Vista, NE.

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Has anyone found a way to resolve this problem? TT blue liner? QUK clutch? How about shimming the stock liner with some paper to close up the gap a lil?
I've done all three of those and all three of them work. I'm cheap so I either shim the stock liner or use the TT blue liner, depending on what I have lying around. The stock clutch has never failed me when set with a .008"-.012" gap (about .2mm). I ususally use the TT Raptor-90 blue liner. Be aware that it's a little shorter than the 700 clutch liner so I had to use 2 pieces. The Lynx liner may work well too. I think Align is now selling a blue clutch liner that (presumably) would be thicker. Part # HN7040A

Bottom line - do NOT run the clutch with a gap larger than .012" or you'll break the clutch.
The stock replacement wouldn't even go over the clutch.
I had to turn it down to near paper thin to get it on and it still is a bit grabby at an idle.

I can't imagine how thin your liner would have to be to get a large gap.
sounds like your clutch may be sprung from the hot start. It doesn't have to be sprung out much to screw up the gap. I had a hot start also last year and I ended up replacing the starter shaft, clutch and relining the bell. In just a couple seconds it got so hot the starter shaft got a little blue'd- from then on after replacing the liner the starter shaft was slipping inside the clutch one-way, magnets in the bell came out. REAL big mess. Replaced it all from parts that someone sold me after converting theirs to electric and it's been smooth so far.

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04-06-2011 09:27 PM  6 years agoPost 11
robv

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SoCal

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Thank you all for your replies.

I will try the Lynx liner and let you all know how it goes. I might go with the Lynx clutch as well.

Team JR | Gens Ace | YS Engines | Scorpion Motors | Pure Tech

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04-06-2011 10:19 PM  6 years agoPost 12
bhoff

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houston texas

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any tips on replacing the magnets? i bought this 700 and one magnet is missing which he told me about and the clutch liner is out, i hope i dont have to replace everything..he told me i can glue the magnet back in with a weld type glue...

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04-06-2011 10:36 PM  6 years agoPost 13
robv

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SoCal

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bhoff,

the important thing is to make sure the polarity is correct on the magnets. so, the polarity on one magnet should be opposite of the other magnet. as far as glueing them, you can use epoxy. i use green locktite by MA. CA works well too.

if you fly hard, consider changing the liner to the lynx liner. and since you have it apart, consider an aftermarket clutch. just note you can avoid future issues with your clutch.

Team JR | Gens Ace | YS Engines | Scorpion Motors | Pure Tech

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04-06-2011 10:50 PM  6 years agoPost 14
jschenck

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La Vista, NE.

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drill a small hole in the magnet pocket on the clutch bell. It'll let the air out when you glue the magnet in, making it much easier.

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04-06-2011 11:40 PM  6 years agoPost 15
bhoff

rrVeteran

houston texas

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awesome guys thank you so much!! okay so to make sure on the polarity, will one magnet want to stick like a magnet or not be able to touch cuz the polarity is different..if so which one do i do?one magnet is in which is good

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04-06-2011 11:46 PM  6 years agoPost 16
bhoff

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houston texas

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also i did order the lynx liner which i guess i bought the right one..and i do fly 3d getting better and better..

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04-07-2011 12:57 AM  6 years agoPost 17
robv

rrApprentice

SoCal

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drill a small hole in the magnet pocket on the clutch bell. It'll let the air out when you glue the magnet in, making it much easier.
+1

it'll also enable you to remove the magnet easier if needed.

Team JR | Gens Ace | YS Engines | Scorpion Motors | Pure Tech

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04-11-2011 01:45 AM  6 years agoPost 18
tamro

rrApprentice

Fort Mill South Carolina USA

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Clutch issues.

Very disappointed. After checking everything out and making sure all is well. I took my Heli to the field and started. some of the plastic from the fan housing melted a bit and feel into the clutch area and ripped-out the clutch lining. i think i need to replace the fan as well. not sure why this is. All the washers are in the fan was clear from rubbing and all. In any case, i will get new parts and replace them.

https://rc.runryder.com/helicopter/...70/&i=1&a=1&s=0

HeliPoPTer

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04-11-2011 04:26 AM  6 years agoPost 19
bhoff

rrVeteran

houston texas

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one question before i start tearing my heli apart..how do you know the clutch liner is out?? only reason i know is because i bought it from a guy who said it was out..im guessing maybe it doesnt start??

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04-11-2011 12:42 PM  6 years agoPost 20
tamro

rrApprentice

Fort Mill South Carolina USA

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clutch Liner

The motor will start just fine and it should. The head will not engage and starts spinning. The motor will rev-up but that is it.

HeliPoPTer

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HelicopterAlignT-REX 700N › Clutch issues?
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