| 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 Isotope235
old hand
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old hand
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 | | | 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
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old hand
Joined: Jun 2001
Posts: 778 Houston | 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
Carpal Tunnel
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Carpal Tunnel
Joined: Jun 2001
Posts: 12,310 South Carolina | 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.htmlTape 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
Carpal Tunnel
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Carpal Tunnel
Joined: Jun 2001
Posts: 12,310 South Carolina | 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 OP
Carpal Tunnel
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OP
Carpal Tunnel
Joined: Jun 2001
Posts: 3,906 Clermont, FL, USA | 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
Carpal Tunnel
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Carpal Tunnel
Joined: Dec 2001
Posts: 5,590 Naples, FL | 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
Carpal Tunnel
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Carpal Tunnel
Joined: Sep 2002
Posts: 3,224 Roanoke Island ,N.C. | 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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