4 posts • joined Tuesday 8th February 2011 18:28 GMT
A tank full of water - will produce a pipe full of water vapour
Can't help thinking that all the 'pipe full of water' solutions will merely produce a long hose with quite a high pressure of water vapour in - maybe not a large fraction of a bar but probably higher than the 10 mbar target. Putting a large cold trap in full of liquid nitrogen would take out all the water vapour and most of the gases but again probably wouldn't get down to 10 mbar. Pumping is the only true way!!
For 20mbar or so you need a rotary vane vacuum pump. If you look on Ebay you can pick up these for a couple of hundred quid. Once you've done with it you can sell it on and probably not lose too much money. Be aware that these pumps produce a fair amount of oil mist in their exhaust (especially when starting to pump down a volume) and that you don't want to breathe that in.
I assume that this pump isn't meant to continue to function once the rocket starts firing - you would need a much, much bigger pump to cope with that.
If you talk nicely to Edwards High Vacuum they might be willing to lend you a pump for a few days in exchange for a mention in the article
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