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ABS carbon barrel heat dissipation......

 
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  #8  
Old 07-15-2006, 10:56 AM
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Re: ABS carbon barrel heat dissipation......

Buffalo Bob is correct. There are many different forms of carbon fiber and adhesives. Christensen uses an altogether different formula than ABS. ABS's is engineered to transfer heat and do it quicker than anyone else's and I have seen it to be a real deal. It is however slightly heavier than Magnum Research and Christensen's wraps.
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  #9  
Old 07-15-2006, 12:06 PM
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Re: ABS carbon barrel heat dissipation......

7mmRHB

If my discussion lead you to believe that I said it wouldn't or couldn't work I am sorry about that.

My discussion was about carbon fibers, gels and heat transfer in general. It is possible to build a light barrel that retains heat or a light barrel that sheds heat. One would a have to know a lot of detailed coeffecients and thickness of materials such as Roy's post says before one could calculate what will happen. There is also the alignment of the fibers, which affect heat transfer.

Some people are may not be very interested in the science behind a carbon wrapped barrel and some people may. Some people will just want to know if it works and could care less why it works.

My preference in looking at sceince is not the commercial vendor but independent research that supports the claimed application. The article I posted a link to was from Penn State and was discussing areonautical applications and comparing carbon to other heat transfer materials. Research scientist are people just like anybody else and their results are often influenced by who funded the research and follow up promises of additional funding. About a month ago when I looked into this, I actually collected the thermal conductivity coeffiecients of barrel stainless steel and about 10-15 diffeerent types of fibers. This information alone was enough to convince me that the heat transfer was theoretically feasible.


Sometimes I just draw up little cartoons of sharks and stuff and sometimes I don't. There was and is no intent to debate or argue with anyone. It was just background information.
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  #10  
Old 07-17-2006, 04:55 PM
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Re: ABS carbon barrel heat dissipation......

Guys:

The testing i did on the Carbon ABS bbl on the 338 Snipe-Tac was like this. During the bbl break in, i used the Mike Rock method, i kept checking the bbl temp and could feel the temp of the carbon rising fast, after 5 shots it was rather warm on the outside. The steel shank was almost cool to the touch. The carbon fiber was pulling the heat away from the steel bbl. I didn't have a thermometer to do any actual tests. The bbl dia on this rifle was 1.400 at the breech, 1" at the muzzel 33" long. I did a very scientific test between the two rifles, after 5 shots i would let the cleaning rod sit in the bbl for a min, the carbon bbl the cleaning rod was just warm. The non-carbon bbl the cleaning rod came out hot.

My personal 338 snipe-tac has a std stainless bbl, same length. after 5 shots the bbl is so hot you cant touch it. It takes quite a while for it to cool down. The carbon bbls really do the job! At least ABS bbls do.`

I read articles on other carbon bbl makers, ones the problems occured with, they seem to insulate the bbl liners.

Mike is a great guy to deal with!!!

Go Huskers!
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  #11  
Old 07-17-2006, 05:11 PM
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Re: ABS carbon barrel heat dissipation......

Desert Fox:

I will be getting some new action blanks in soon. I have a re-designed Rem 700 type action made special for the 408 case. These are in stainless steel, wire EDM cut. My Ti actions are only in the full bolt style, they need a special hardened insert for the high pressure case.

I am thinking of using an ABS carbon bbl on my 10,3mm project. It will have a 1.650 breech tappered to 1.250 at the muzzel. Mike says that if and when the bbl is shot out he can rebore it to 50cal. You get double life out of the bbls. Same with the 338 snipe-tac, he says you can have it bored to 408 or 375 cal.

Dave
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  #12  
Old 07-18-2006, 02:32 AM
 
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Re: ABS carbon barrel heat dissipation......

[ QUOTE ]
Research scientist are people just like anybody else and their results are often influenced by who funded the research and follow up promises of additional funding.

[/ QUOTE ]

You might want to reconsider that outrageously condemning myth. A researcher is only as good as her work and credibility. Having participated in funded research for the last two decades I can tell you I've never read a paper or met an investigator who skewed results for short term funding. I suppose when the VP is calling the best research junk (then admitting he was wrong a few years latter) it's easy for the public to believe that myth.

Other than the disparaging comment, your post was stellar.

[ QUOTE ]
Desert Fox: ...The rapid cooling I believed can be attributed to the barrel being thin and therefore has less mass...

[/ QUOTE ]
For a homogeneous/isotropic material (gun barrel steel, carbon fiber is not isotropic) you have the correlation exactly opposite. For a given conductive material, heat transfer is increased with mass and surface area. A thinner barrel cooling faster must be MUCH more conductive.

Roy in ID.
Temp can be calculated on a pipe via solving the product form of the wave equation. See any elementary book on numerical solution of partial differential equations.

I plan on using 5 of omega's Thermocouples connected to my A/D (going to my laptop). At the same time I'll have an RSI strain gauge recording pressure. I was hoping to correlate the timestamps, pressure, temp change and get good reading for the barrel surface. I think buffalobob is right, what counts is the temp inside the barrel. To solve the heat equation for every position on the pipe you need the boundary conditions (ie, the temp in the throat)
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  #13  
Old 08-01-2006, 10:43 PM
 
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Re: ABS carbon barrel heat dissipation......

Click this for GG's IR report

Here's the images.

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http://img.photobucket.com/albums/v3...r/thermal3.jpg
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  #14  
Old 08-02-2006, 10:27 PM
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Re: ABS carbon barrel heat dissipation......

Thanks for your kind words and for the link B1g B0re. I really appreciate it.
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