Author Topic: Totally crazy idea: Space launch site on Mt Kilimanjaro?  (Read 37740 times)

Offline sghill

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Re: Totally crazy idea: Space launch site on Mt Kilimanjaro?
« Reply #100 on: 06/15/2018 07:27 pm »
Let it burst through several bladders of reinforced cellophane or something similar.

Without doing the maths, my gut reaction is that the strength of the plastic, in order to hold the pressure difference (the weight of the air it is supporting), must be higher than the pressure difference itself. So hitting the "bladder" will always be worse than hitting the air itself.

Well, simple Seran wrap is 12.5 μm thick with a tensile strength of 1,000 to 12,000 per square inch! So if you are starting at 8 or 9 ambient PSI and dropping down to 1 or 2 PSI for the exit pressure, your tensile strength will determine how large a diameter you can make your plastic sheet before it bursts on the center. Assuming you make the tube a diameter small enough for only 1 PSI difference between each side of the sheet, only 9 sheets of Seran wrap between the top and bottom of the tube are needed to make the bottom pressure equal to the top pressure. Remember also that the air above each sheet is supported by the air below it. The sheet at the bottom doesn't support the whole air column.
« Last Edit: 06/15/2018 07:57 pm by sghill »
Bring the thunder!