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GrandRC . CanoMod . Futaba-RC

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Compass Knight 50 > Quick uk raptor clutch in a knight
 
 
steve the flip
Heliman
Location: epsom surrey uk

I have always had a problem with the knight clutches I'm on my 5th one now. I was told the quick UK heavy duty raptor clutches are the same so i decided to get one. The problem is that it won't go into the fan hub because the step down on the clutch is a bigger diameter than the knight ones.
Has anyone use this clutch and did they have the same problem if so how did you get round it?

Fly it like you stole it!
11-11-2008 06:05 PM
 
 
heliandy3
Heliman
Location: England

i just used some emmery paper wrapped round my finger,just keep trying it till it fits .worked for me anyway.
andy
11-11-2008 09:43 PM
 
 
waveydavey
Heliman
Location: Milton Keynes UK

Steve, Andy

Did you have the same problem as I currently have. The clutch doesn't take up straight away. The governor kicks in because the engine has reached 25% of target and as the blades haven't started turning the pick up is then really quite violent swinging the heli sometimes 90 degrees. I have replaced it with a new one but It's only marginally better. I've been thinking of the same mod what do you reckon?

Oh my god the ground came out of nowhere!!
11-11-2008 09:56 PM
 
 
heliandy3
Heliman
Location: England

the problem i had was clutches breaking after a few flights (15-6-8).after fitting the quick uk one i have not had any problems,(96 flights so far).sounds like the clearance is to much waveydavey,have you fitted a new liner recently .the clearance needs to be 12 thou ,thats 6 thou all the way round.
andy
11-11-2008 10:16 PM
 
 
waveydavey
Heliman
Location: Milton Keynes UK

Hi Andy, fitted new liner first then a complete bell still the sameish problem. I've just got used to it but I don't think it's right. If the gap between the liner and the clutch is too big how do I go about making it smaller?

Dave

Oh my god the ground came out of nowhere!!
11-11-2008 10:35 PM
 
 
rspblake
Senior Heliman
Location: London uk. coulsdon

Dave

Think you will find its possibly not the clutch thats is always faulty, the air gap on the bell can cause the clutch to fail.. Being too large!

Think from memory the clutch is 38mm and there needs to be a 12 thous extra leaving a 6 thou air gap all the way around measuring the inside of the bell should be around .304mm larger, so 38.3mm but you get the idea!

If its to large replace liner!

Remove the old liner from the old bell,(Use a Knife Be careful) then put two layers of insulation tape around the new clutch ,(cut the tape just before the started point)

JB weld is what I used in the past, 24hr one, add a layer to the bell wall and the new liner, place into the bell and press the clutch in with the tape on it.

Might find its pushes the excess out wipe away with a rag!

Over night to dry, remove clutch (bit of a pain to pull out sometimes) then remove tape clean with a bit a spirit.

Measurement should be around right! give or take the thickness of the tape used. 6 thou air gap seems to work! you can take some measurement before gluing.

Check that to start.

Rob

Other things was rubbers in the engine mount shot! and also where the canopy post bolt in to the plastic centre, the thread turns in the support, its all loose so the frames flex and it allows the bell to run off line remove the plastic insert and replace with a ALU post instead!


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(gunnell_s) still owes me money!
11-12-2008 01:16 AM
HOMEPAGE  
 
 
steve the flip
Heliman
Location: epsom surrey uk

Hi thanks for the help. The problem was the clutches would expand but not retract to the same size so the clutches was always grabbing even on idle i tried everything even changing the liner even though it didn't look bad.
I've gone through 3 clutches in two months and that's with the new liner.

Fly it like you stole it!
11-12-2008 06:03 AM
 
 
rspblake
Senior Heliman
Location: London uk. coulsdon

You need to know the air gap, if you fitted a new liner there is nothing to say that the air gap was correct, even if using a compass liner.

It sound to me like it could be a too large air gap as the clutch will expand to a certain size beyond this then will not return so it grabs.

Earlyier one where harder and would just break.

We did have a fault with one clutch and was replaced with a quick one and still went, that was down to the air gap.

Now the bells are not machines as in the liner is just fitted the early one was machined but was oversized. So the air gap could be 12 thou or bigger.

It's a pain but there seems to be only the air gap fault and the lining that seems to smear instead of turning to a powder as it wears that I have come across.

Cleaning the liner on the one that smears seems to work between bearing changes on the engine anyway.

We are looking in to balancing the clutches as well just incase it makes any difference

Will let you know of I find a reason other that what I sergest

Rob


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(gunnell_s) still owes me money!
11-12-2008 02:17 PM
HOMEPAGE  
 
 
waveydavey
Heliman
Location: Milton Keynes UK

Rob

I don't like pointing out the obvious but wouldn't it help if the clutch bell, liner and new clutch were of the correct size. I have replaced all components with the same result.

Are you saying that the clutch liner sticks to the insulating tape? Then the tape is stuck to the inside of the bell. Is this secure enough?

I've found that a hot air gun gently played over the bell allows you to remove the liner material without a knife.

Oh my god the ground came out of nowhere!!
11-12-2008 06:07 PM
 
 
waveydavey
Heliman
Location: Milton Keynes UK

I've got it Rob, as they say read twice reply once. The epoxy makes up the gap if it's too big Dahhhh

Cheers

Oh my god the ground came out of nowhere!!
11-12-2008 07:32 PM
 
 
rspblake
Senior Heliman
Location: London uk. coulsdon

Quote 
epoxy makes up the gap

Yes the space between the liner and the bell is filled if needed!, new parts its just glued no space as liner is slightly thicker now, from memory

Quote 
clutch bell, liner and new clutch were of the correct size.

Clutches have never changed in size, Well that I am aware of.

Most are that's not to say all are correct!

Which is why measuring is the only way, if you have a fault.

Throwing a new clutch at it will not cure if its over-sided.

The factory are more aware of the situation now and have been for many months, but some kits and parts could of be around for more than that!, OK evorc seem to roll though the parts/kits quicker but thats just due to sales.

Not saying who is right or wrong, but I do like a reason and a cure before I blame one item!, Yes we had a batch that was faulty month and months ago but not all of them can be if they keep breaking, I am the 1st to admit that most of this is trial and error, but to the most part, kits that had faults are sorted before they reach the market place.

I like many want to find a reason then to find an answer is easy

Rob

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(gunnell_s) still owes me money!
11-13-2008 01:33 AM
HOMEPAGE  
 
 
waveydavey
Heliman
Location: Milton Keynes UK

Cheers Rob. Have fitted a new bell and will see how I go.

Oh my god the ground came out of nowhere!!
11-13-2008 07:16 PM
 
 
rspblake
Senior Heliman
Location: London uk. coulsdon

dave, what was the air gap with the new bell, did you check?

(gunnell_s) still owes me money!
11-14-2008 08:37 AM
HOMEPAGE  
 
 
waveydavey
Heliman
Location: Milton Keynes UK

Hi Rob

Less than 0.1mm. It doesn't seem too bad.

Oh my god the ground came out of nowhere!!
11-15-2008 07:39 PM
 
 
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Compass Knight 50 > Quick uk raptor clutch in a knight
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