I can't tell what happened here. Take a look and see if you can tell. The bell is only about 3 gallons old as is the clutch. I was getting a loud slipping sound when descending the last few flights when I noticed my muffler was loose. When I tightened my muffler it nearly went away and only happened once in a long while in very steep level descents. It looks like the very edge top of the clutch is rubbing the top of the bell, could that have caused the failure?

I also have a problem with the one way clutch bearing slipping when I go to start the engine sometimes. What causes that? I never used to have that problem. I replaced the start shaft but that didn't do the trick. I know for a fact the slipping is coming from the bearings.


Here's another view of the clutch.

if v1 ? its common but for v2 i dont know

V1 with heavy duty clutch

Stick a Quick UK clutch on it, and it should be good from then on in...

There is just no way a V1 clutch would fail!!!!!!!!!!!!!!! Seriously though, this is very comon for the V1. I don't think anyone actually solved the problem reliably. I agree get a clutch from Quick UK and go on. I preffer the ones with elongated holes machined into them as opposed to the round holes the come with from the factory. Also make sure you use a shim to keep it off the top of the fan. Good luck!

I have a Raptor v1 and have seen using the Quick UK clutch as a a replacement a couple times on the posts. I'm thinking of buying one before my clutch goes, since it seems too common. I have just over a gallon through it only, but would hate to miss a good weekend of flying.

Couple of questions: Do I have to replace the liner and/or bell when I put in a new clutch (assuming it still looks thick enough)?

How do you remove the old liner? Looks like it would be a pain.

Also, what are the results of clutch failure? Can it cause a crash, or does it usually just "lock" up so the blades can't freewheel (which means at least I can land it under power)?

My rappy v1 made a strange clunk or heavy click sound the other day in a hover and I immediately set it down. All 'looks' good but I'm going to pull out the engine and check the clutch assembly to check it. The blades spin freely, but I haven't restarted it to troubleshoot.

I also have a V1. just recently I put in the 3rd clutch at flight 230. I usually carry a spare clutch in my flight box. I think its just a V1
problem. But at $18.00 a clutch I can live with that.

Fred..

The clutch problem and the flutter problems of the V1 converted most of our club from the Raptor to other helis like the Hawk or Caliber.

The heli side of my RC club is completely made out of raptors. We've only had one visiting Caliber.

to answer your questions:

normally you do not need to changer the liner when you change the clutch (unless the liner is all worn out...)

a clutch failure will most likely not cause you to crash, often you won't even notice for a while...

never head a clutch failure nor any flutter on any of my (C)raptors... but other things broke...