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HomeAircraftHelicopterSynergy R/CSynergy N7 › Broken clutch lobes
09-18-2018 11:48 AM  27 days agoPost 1
Robert Sinsky

rrNovice

Aberdeen Maryland

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Hey guys I'm scratching my head here. I have the N7 with the 105 OS and boost pipe. I run Byron's 30% with the larger shim on the head. When I first finished it it had the smaller clutch and it flew fine. After a few gallons I ran the head speed to high and broke the small clutch. I know that's my fault. I talked to a couple of field reps and they advised me to make my head speed no more than 1800 , which I did. I installed the new XL clutch and after a couple gallons again a lobe breaks off. Keep in mind I'm not turning a high head speed at all. I talked to a field rep who's a friend and he told me the nature of the beast and all depends on how you treat it. I've own a few Align 700 Nitros and never had this issue no matter what I did. This is a first for me. Any ideas ? Opened minded and want to learn because this will become expensive and who knows what could happen if it breaks at the wrong time . Thanks for listening.

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09-18-2018 12:57 PM  26 days agoPost 2
JuanRodriguez

rrProfessor

The Villages, Florida

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My guess would be

1. A crappy clutch design along with crappy materials used to manufacture it .

2. Too much gap between the clutch and liner which results in the shoes flexing to the point of fatigue followed by breaking. (I would guess this is probably the cause)

I think your “field reps” are feeding you a line of BS a mile long

PS- Back in the day when I was very active, we used to remove the stock liners and installed our own so that they could then be machined down to proper clearance. This was done at the time of the build ....

Been there, done that and old enough to know better.....

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09-18-2018 01:04 PM  26 days agoPost 3
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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I honestly don't see what the headspeed has to do with the clutch. Once the shoes expand to engage the clutch there's nowhere to go.
I also suspect the gap between shoe and liner is too large, allowing the shoe to over expand.

spending time, paying attention

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09-18-2018 02:59 PM  26 days agoPost 4
Dr.Ben

rrMaster

Richmond, VA, USA

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Not a headspeed issue.
Not a clutch design issue.
Not a materials quality issue.

Too much clutch gap causes this.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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09-18-2018 05:26 PM  26 days agoPost 5
banshee rider

rrApprentice

Phoenix AZ.

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+1
What Dr Ben says

ageing is manditory maturity is optional

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09-18-2018 11:51 PM  26 days agoPost 6
Jerry K

rrKey Veteran

Houston Area

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At 16-17,000 the alum bell stretches also so the gap needs to be kept as close as possible between the shoes and bell to prevent straining the shoes, breaking them.

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09-19-2018 12:06 AM  26 days agoPost 7
wjvail

rrKey Veteran

Meridian, Mississippi

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Jerry K
At 16-17,000 the alum bell stretches also so the gap needs to be kept as close as possible between the shoes and bell to prevent straining the shoes, breaking them.
Actually there is an optimal gap. I personally find that .008" is just about right for most helicopters. Anything less and there is too much drag at idle and any more is just inviting slipping or breakage. 8 thou might actually be a little tight but after a bit of running it's perfect.

"Well, Nothing bad can happen now."

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09-19-2018 12:40 AM  26 days agoPost 8
Jerry K

rrKey Veteran

Houston Area

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wjvail
Actually there is an optimal gap. I personally find that .008" is just about right for most helicopters. Anything less and there is too much drag at idle and any more is just inviting slipping or breakage.
Thanks for supplying the number, but I figured we all knew about running it too tight. The point was that the bells expand also allowing the shoes to expand bigger that the actual clearance.

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09-19-2018 01:04 AM  26 days agoPost 9
wjvail

rrKey Veteran

Meridian, Mississippi

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Jerry K
The point was that the bells expand also allowing the shoes to expand bigger that the actual clearance.
I suppose it logically follows that the force the clutch shoes exert on the bell deform it - but, I have no way to measure this. If the bell expends from the pressure exerted by the shoes, it is possible the clutch deforms more than is at first apparent...

Aligns new 700XN clutch bell includes a one piece steel liner. As such there is likely zero deformation. While I haven't experienced it myself, I'm told traditional Align clutches can fail just like the subject of this thread. It wouldn't surprise me as my 700XN came with a massive amount of clearance. As supplied my 700XN came with a steel on steel clutch and .016" clearance per side. Align might have been trying to address clutch failures with a liner that virtually guaranteed zero deformation.

"Well, Nothing bad can happen now."

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09-19-2018 02:45 AM  26 days agoPost 10
REDNOSERAPTOR

rrVeteran

NEW YORK

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I agree with Dr. Ben and Banshee this is a clutch gap issue, Maybe from a previous hot start or even aggressive stick management on collective causing slippage and over time increasing the gap between clutch and bell.

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09-19-2018 02:55 AM  26 days agoPost 11
JuanRodriguez

rrProfessor

The Villages, Florida

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Yup , pretty much what I stated on post # 2

Been there, done that and old enough to know better.....

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09-19-2018 09:42 PM  25 days agoPost 12
John Benario

rrVeteran

Las Vegas

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I always turn my liners to .012 difference, or .006 gap. Yes it drags a bit when new, but barring multiple hot starts one liner will last the life of the model. Send me your clutch bell and a liner and I’ll turn it to whatever clearance you want.

John Benario

Team highest quality
Futaba radios
Cool Power fuel
John's Ultimate building school

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09-20-2018 01:31 AM  25 days agoPost 13
JuanRodriguez

rrProfessor

The Villages, Florida

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I used to turn the liners down for “the boys” to .008
I had an unlimited supply of Garlok 3000 back then so I used to to the entire job for free ....

Been there, done that and old enough to know better.....

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