The airship/blimp guys say the conservative estimate is 60 lbs of lifer per 1,000 cubic feet. Our own Todd Bradshaw said earlier 70 pounds per 1,000...
That tax is a little hard on the US economy, though. Lots of better, more effective uses, like education, that would actually show a positive return...
A possible issue with buying a used vacuum pump is that you don't know what they were using it for and what it might be contaminated with (something...
Yes. People use all sorts of stuff as a vacuum reservoir: the Joe Woodworker plans (https://www.veneersupplies.com/docs/instructions-Project-V4.pdf)...
There's some truth there. Once upon a time, there were inter-city bus networks, inter-urban light right and commuter trains, passenger trains, . . ....
With any vacuum setup, you have a vacuum source -- be that a vacuum pump or a venturi vacuum generator. That sits behind a vacuum reservoir -- think...