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Post by apophys on Dec 31, 2018 3:34:25 GMT
Couldn't you build a double hulled tank for storing H2, with something like a mercury vacuum pump or some other extremely low pressure pump process recollecting the leaking H2 from the outer hull? Yeah, that's necessary when you want to store the H 2 for months/years without noticeable losses. Not great for tank mass ratios though (which already suck for H 2 due to its density), & increases complexity, adding a mechanical point of failure. I tried building an MPD-equipped ship as light as practically possible - got this, seems pretty nice: Pro tips: Maximally-lengthened polyethylene crew modules are lightest. Boron nitride or amorphous carbon make the best reactor radiators. Surface with tungsten for realism (lowest vapor pressure). Use diamond or VCS tanks, maximally lengthened. If they become hard to fit, use bundles of small tanks (like 5x 100t) instead of 1 big one. These changes shave 20 tons of dry mass from the craft, giving +10 km/s dV.
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Post by airc777 on Dec 31, 2018 4:56:54 GMT
Couldn't you build a double hulled tank for storing H2, with something like a mercury vacuum pump or some other extremely low pressure pump process recollecting the leaking H2 from the outer hull? Yeah, that's necessary when you want to store the H 2 for months/years without noticeable losses. Not great for tank mass ratios though (which already suck for H 2 due to its density), & increases complexity, adding a mechanical point of failure. I'm guessing diamond anvil manufactured meta stable metallic hydrogen is too speculative for your liking?
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Post by apophys on Dec 31, 2018 5:10:03 GMT
I'm guessing diamond anvil manufactured meta stable metallic hydrogen is too speculative for your liking? Too explosive also.
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