Discussion in 'Composites' started by berridos, Mar 10, 2011.
They fill nitrogen into the tube
Cannot find the original thread
Here's a rather long one. It drifts a bit but gets back on topic and several methods are described including rocket body tubes. The google search button often works better than the built in search function
A lathe-cut foam core:
YouTube - rough turning foam
Seems like another interesting solution. Styrofoam can be eaten away after the lay-up has cured and this makes tapered tubes possible too.
Pre-made graphite and fiberglass tubes. Listed diameters aren't very large, but they may do custom orders.
I didn't look at all the links, so this might have been covered. In a book about composites I have, the author talks about how the spar for, I think, the Gossamer Albatross was made. They took an aluminum tube and layed up uni pre-preg on that, then wrapped it in heatshrink plastic. Then hot oil was pumped through the tube, both curing the prepreg and shrinking the wrap, which acted like vacuum bagging. After it was done, the aluminum tube was dissolved out with acid. Sounds like a pretty impressively innovative solution.
Dissolved with acid? That sounds scary.
What acid dissolves aluminium and preserves your lungs?
With eating up a lower and upper channel of the alu tube the rest could be pulled out easily.
I like the idea if it wouldnt be as dangerous as it sounds.
As I recall MaCready used chlorine from a swimming pool supply store
Read the other thread. All of this stuff was already talked about, and in detail.
Dr. McCready used swimming pool acid. Yes it had to be nasty compared to the stuff I found to be inadequate...
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