Carbon fiber

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TRFfan

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Does anyone here make custom carbon fiber parts?
 

Dwatkins

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X3! Charlie's tubes were the only ones to survive the Loki 54mm M in a Min. Dia rocket at balls this year! I have had his tubes out to Mach 3.6 in my Wildman Falcon Extreme with no damage.

Dennis
 

mad4hws

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ok, thanks. :)
Our tarc team has made their own carbon fiber tubes for the past couple of years. the commercial tubes aren't the right size and are too beefy. They use a coupler tube from Balsa Machining Services as a mandrel. The mandrel is first fitted with a layer of mylar, which acts as a release layer. It is sprayed with frecote before the lay-up begins. Once it is layed up, a layer of peel ply is added (very important step). We use 1k fabric from SollerComposites and do 3 wraps. It's not strong enough for HPR, but it's definitely strong enough for TARC and super light weight. Here's a pic of this year's first rocket, BT60 and a 29mm motor mount. This is a lot of work though.

2016-12-06 21.30.25.jpg


2016-12-06 21.30.46.jpg
 

dhbarr

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Our tarc team has made their own carbon fiber tubes for the past couple of years. the commercial tubes aren't the right size and are too beefy. They use a coupler tube from Balsa Machining Services as a mandrel. The mandrel is first fitted with a layer of mylar, which acts as a release layer. It is sprayed with frecote before the lay-up begins. Once it is layed up, a layer of peel ply is added (very important step). We use 1k fabric from SollerComposites and do 3 wraps. It's not strong enough for HPR, but it's definitely strong enough for TARC and super light weight. Here's a pic of this year's first rocket, BT60 and a 29mm motor mount. This is a lot of work though.
What fabric weight are you using ( oz/yd2 ; GSM )?
 

mad4hws

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What fabric weight are you using ( oz/yd2 ; GSM )?

It's 1K fabric from soller composites, 125gsm. This stuff is much easier to work with than the 3K 2x2 twill weave. It doesn't move around as much.
 

dhbarr

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Cool, so biax-uni-biax sleeve should make a pretty decent ( albeit rather heavier ) tube. Been noodling on that for a while, and your post jogged my noodler :)
 

mad4hws

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Cool, so biax-uni-biax sleeve should make a pretty decent ( albeit rather heavier ) tube. Been noodling on that for a while, and your post jogged my noodler :)
We tried the sleeve too, but with limited success. It's great because it doesn't have any seams. However, the fibers are thicker, so it results in a heavier component. Soller composites sells a heat shrink tube that should squeeze all of the excess epoxy out, but I couldn't get it to work well. Perhaps if you vacuum sealed it would create better pressure, but then there would be seams around where the bag compresses. After trying this a few times, we just went back to basics using the smaller weave and using the peel ply. The seam is noticable though. We could squeeze out a little more by using a vaccum press - maybe we'll try that next. Also, when working with resin, we are very careful to wear respirators. Here's the team doing their best Darth Vader impression

2016-11-08 19.41.11.jpg
 
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