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Originally Posted by Tom Bottiglieri
Carbon Fiber?
Titanium?
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Both are hellish to machine. (Titanium eats tools, carbon fibre emits
very nasty splinters--and if you're making your own, keep the resin out of your lungs.)
Edit: Heck; Tyler beat me to it. And the welding thing is a good point--in addition to argon, you need very special welding rod; it makes you wonder how the Russians ever managed to put together the Sierra class of titanium-hulled submarines (useless fact...).