Hi Rick, Could you give a little detail on how and where this transition is going to be used? Is this piece hollow or are you leaving the solid foam mold in...
... I'm building a full scale model of a piece of WWII rocket-propelled ordinance. Picture a 2.25 inch rocket motor threaded into the fuze socket of a 188mm...
Mick, I have been lurking the site for quite a while and have been walking thru your photo set on creating my own fiberglass tube. In that set you use Liquid...
http://www.avtcomposites.com/general.php3 Half-way down the page you'll find *PTFE Liquid Release*. I got great customer service from these guys on two...
Hi "petoskeyscott", Charlie's info on the Liquid Teflon was right on. This is where I get my Liquid Teflon. I have not found a replacement for this product and...
Hi Mick, I've always used some non-sticky barrier between my layup and my mandrel, like waxed paper or mylar. The liquid Teflon sounds like a great idea. ...
Hi Tom, I use full-length tube couplers as my airframe mandrels. I get my couplers from Public Missiles web site. They are phenolic couplers and come in 36"...
I have just completed my mandrel for 11.5" airframes. I made it 72" long so that all of the fabric may be used width wise from a roll. As for liquid Teflon,...
Hi Keeb, With that large of mandrel, just to be safe you might want to put 15 coats of wax on instead of just the ten. Also do you plan to wrap the mandrel...
Mick, Gives me an idea--preheat the mandrel a bit to expand it ever so slightly, then when stuff cures and cools, may slip off with less bother. Need for...
I have a Q motor casing that I would like to build an airframe around. I've been told in the past that using the actual motor casing as a mandrel is a big...
Depends on how clean, smooth and consistent the external shape of the motor case is. I've done it by wrapping 4 or 4 wraps of mylar release around the case...
Warren, When compared to the metal tubing I've bought, most casings are on average much better, with the exception of the Loki hardware I got from wildman--run...
Warren, No wonder I'm getting such good sims! (Seriously, I meant as a mandrel for the g80 fincan). KISS principle, keep em skinny... J ... Actually John, that...
I'm sure that would be fine John... I'd use the longer case - what is that one? the 29/360? In any event, it's the case for the I200. Dr. Rocket doesn't show...
My only concerns would be the possibility of speeding the cure of the epoxy and possibly curing it unevenly due to the mandrel's cooling during layup. Just my...
That was my thought, as well. With a motor that large, heat soak is going to be a concern. How do you plan to handle that? There are lots of options, but I...
Personally, if this Q project is to be a minimum diameter bird as it appears, I would use a piece of phenolic as a leave-in mandrel. I'd also use Cotronics...
... Hi Brad! Good point and one I had not considered. There may be options but that's definitely a show-stopper isn't it? <grin> It's great to be able to run...
... Mick, Gives me an idea--preheat the mandrel a bit to expand it ever so slightly, then when stuff cures and cools, may slip off with less bother. Need for...
Chuck, The motor case IS your airframe! Build your carbon fiber airframe above the motor casing to hold the recovery device(s). Might even want to bring the...
Thanks for the extra info there Mick. I have thought many times over on how the best way to proceed with the airframes might be. One of my biggest fears is...
This has been done before with several issues. First was getting the tubing to shrink. You must be able to get it cold enough to do so. This requires some very...
In a message dated 6/3/06 7:37:05 P.M. Eastern Daylight Time, tra5336@... writes: This has been done before with several issues. First was getting the...
Damn Dave, Not so loud man. OK! Keeb _____ From: CompositeRockets@yahoogroups.com [mailto:CompositeRockets@yahoogroups.com] On Behalf Of Ez2cDave@... Sent:...
In a message dated 6/3/06 8:06:45 P.M. Eastern Daylight Time, tra5336@... writes: Damn Dave, Not so loud man. OK! Keeb ************ Sorry, Keeb ! LOL...
Hi Keeb, One more thought on the mandrel. If you can try to leave a couple of inches on either end of the mandrel free from the lay-up. Don't run the cloth...
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