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Re: I broke my Battlestick [Re: David Ingram] #246963
04/13/12 08:23 AM
04/13/12 08:23 AM
Joined: Nov 2005
Posts: 807
Hillsborough, NC USA
I
Isotope235 Offline
old hand
Isotope235  Offline
old hand
I

Joined: Nov 2005
Posts: 807
Hillsborough, NC USA
If you want a nice finish with less sanding, and are willing to spend a few more bucks, Soller Composites also sells treated shrink-tube you can use instead of tape or peel-ply. You wet down the cloth (or sleeve), slip the shrink-tube over the joint, and shrink it down from the middle out to each end. That squeezes out the excess resin. Once cured, you cut and peel it off, leaving a nice, smooth surface.

Be prepared for sticker shock though. The treated shrink-tube costs more per-foot than the carbon fiber sleeving.

If you want to make a plug out of carbon fiber, the sleeving would work pretty well for that too.

Regards,
Eric

-- Have You Seen This? --
Re: I broke my Battlestick [Re: Jake] #246964
04/13/12 08:28 AM
04/13/12 08:28 AM
Joined: Jun 2001
Posts: 778
Houston
carlbohannon Offline
old hand
carlbohannon  Offline
old hand

Joined: Jun 2001
Posts: 778
Houston
Originally Posted by Jake
My method makes the sleeve external around the fracture.

Do not ask me to explain, I have documented proof that my Structural Design skills should not be trusted so I can just parrot words "unless your external repair is stiffer than the original tube, you get some bending at the repair, once that happens you are concentrating loads at the original break on a repair that is weaker than the original tube. After that, you get cracking and finally the repair fails. That is one reason you want to use a piece of the original tube as an inner sleeve, properly done, this bends like the original tube so you are not concentrating the stress...... If you use a repair that is much stiffer that the original, the tube will bend at the edges of the repair causing cracking and failure"

Don't take this as any gospel, the standard methods are probably way overkill.

My method is to try a tapered joint with a external sleeve. If it breaks at same point again, redo it with an internal sleeve. The exception to this are masts. With masts I use everything I know and try not to dream up stuff that will make things worse.

Re: I broke my Battlestick [Re: samc99us] #246967
04/13/12 08:31 AM
04/13/12 08:31 AM
Joined: Jun 2001
Posts: 12,310
South Carolina
Jake Offline
Carpal Tunnel
Jake  Offline
Carpal Tunnel

Joined: Jun 2001
Posts: 12,310
South Carolina
Originally Posted by samc99us
Where are ya'll ordering your supplies from? Fiber Glast is one of the most expensive sources for fiberglass or carbon cloth. CST may be the only supplier to top them.

Solar Composites generally has the best pricing on carbon cloth stateside. ACP has good pricing on sleeves: http://www.acpsales.com/Tapes-and-Sleeves-c-4957.html

Tape can be made from sheets of 5.7oz carbon, I do it all the time. Sleeves are much better for tube type repairs, simply because they are easier to work with. I've repaired 3 hockey sticks and a myriad of broken carbon tubes in the past few weeks and most all were a 30 minute job with the sleeve, and all came out stronger than the original tube.

On this, I will suggest you use super glue (thin CA) to bond the stick back into shape. Epoxy would do OK but CA dries instantly so if you can get a second person to apply the glue while you hold the joint in place it will work perfectly (CA is near as strong as epoxy but more brittle in this application). Then scuff the surface with 150 grit paper and apply the sleeve or tape wrap with epoxy. Use Jake's and/or Bille's suggestions above for wrapping with peel ply to get a good finish. Clear tape can be substituted for peel ply in a pinch but is likely to stick to the mess when you are done.


www.USComposites.com in Florida or www.fiberglasssupply.com.


Jake Kohl
Re: I broke my Battlestick [Re: carlbohannon] #246969
04/13/12 08:32 AM
04/13/12 08:32 AM
Joined: Jun 2001
Posts: 12,310
South Carolina
Jake Offline
Carpal Tunnel
Jake  Offline
Carpal Tunnel

Joined: Jun 2001
Posts: 12,310
South Carolina
Originally Posted by carlbohannon
Originally Posted by Jake
My method makes the sleeve external around the fracture.

Do not ask me to explain, I have documented proof that my Structural Design skills should not be trusted so I can just parrot words "unless your external repair is stiffer than the original tube, you get some bending at the repair, once that happens you are concentrating loads at the original break on a repair that is weaker than the original tube. After that, you get cracking and finally the repair fails. That is one reason you want to use a piece of the original tube as an inner sleeve, properly done, this bends like the original tube so you are not concentrating the stress...... If you use a repair that is much stiffer that the original, the tube will bend at the edges of the repair causing cracking and failure"

Don't take this as any gospel, the standard methods are probably way overkill.

My method is to try a tapered joint with a external sleeve. If it breaks at same point again, redo it with an internal sleeve. The exception to this are masts. With masts I use everything I know and try not to dream up stuff that will make things worse.



Hey, Hey...I'm usually the guy for overkill...but....Errrrr...it's a tiller. Making the finish on the external sleeve pretty is a bonus. I've repaired several on my a-cat and haven't had a problem (I keep dropping the tiller in the water when rounding A-mark and it gets caught under my rudder arm and breaks). The only stresses a tiller sees that might cause the kind of cracking you are talking about would simply see it break somewhere else when the repair is bulletproof.

A mast? now that would be a different story.


Jake Kohl
Re: I broke my Battlestick [Re: Team_Cat_Fever] #246971
04/13/12 08:46 AM
04/13/12 08:46 AM
Joined: Jun 2001
Posts: 3,906
Clermont, FL, USA
David Ingram Offline OP
Carpal Tunnel
David Ingram  Offline OP
Carpal Tunnel

Joined: Jun 2001
Posts: 3,906
Clermont, FL, USA
Originally Posted by Team_Cat_Fever

Saved by the Carbon wonder boy?


bingo


David Ingram
F18 USA 242
http://www.solarwind.solar

"Do or do not. There is no try." - Yoda
"Excuses are the tools of the weak and incompetent" - Two sista's I overheard in the hall
"You don't have to be a brain surgeon to be a complete idiot, but it helps"
Re: I broke my Battlestick [Re: David Ingram] #246975
04/13/12 10:48 AM
04/13/12 10:48 AM
Joined: Dec 2001
Posts: 5,590
Naples, FL
waterbug_wpb Offline
Carpal Tunnel
waterbug_wpb  Offline
Carpal Tunnel

Joined: Dec 2001
Posts: 5,590
Naples, FL
Originally Posted by David Ingram
it will be good to learn how to work with the black nasty.


Does he know you're calling him that?


Jay

Re: I broke my Battlestick [Re: waterbug_wpb] #246991
04/13/12 03:20 PM
04/13/12 03:20 PM
Joined: Sep 2002
Posts: 3,224
Roanoke Island ,N.C.
Team_Cat_Fever Offline
Carpal Tunnel
Team_Cat_Fever  Offline
Carpal Tunnel

Joined: Sep 2002
Posts: 3,224
Roanoke Island ,N.C.
Originally Posted by waterbug_wpb
Originally Posted by David Ingram
it will be good to learn how to work with the black nasty.


Does he know you're calling him that?


He does now.


"I said, now, I said ,pay attention boy!"

The cure for anything is salt water - sweat, tears, or the sea
Isak Dinesen
If a man is to be obsessed by something.... I suppose a boat is as good as anything... perhaps a bit better than most.
E. B. White
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