Condottiere said:
Vapour chambered hulls?
Sigtrygg said:I know this is a low tech thread but - you just got me thinking. Perhaps the liquid hydrogen tanks on TL9+ships are not cryogenic but are a result of gravitics being used to liquefy the hydrogen? Another application of gravitics along with artificial gravity, acceleration compensation and waste heat management.
On low TL ships TL8- you are going to have to have cryogenically cooled liquid hydrogen, but it can be stored in a dewar vessel (vacuum flask) easily enough. Perhaps the fuel tankage on low TL ships need to have a dt surcharge - pumps etc for hydrocarbon fuels, dewar storage for liquid hydrogen and liquid oxygen.
As far as I understand H₂ cannot be liquified above 33.2 K.Sigtrygg said:I know this is a low tech thread but - you just got me thinking. Perhaps the liquid hydrogen tanks on TL9+ships are not cryogenic but are a result of gravitics being used to liquefy the hydrogen?
Condottiere said:Is the hydrogen in the fuel bladders under pressure?
Because capacity is comparable to actual tank capacity.
Hydrogen fuel is canonically stored as liquid hydrogen. Liquid hydrogen does not need to be put under pressure, just kept refrigerated.Linwood said:I’ve been assuming it must be.
Don't even need much pressure, just cool it below 14 K. It changes to a different structure at very high pressure.baithammer said:At low temp and high pressure it appears to become a solid rather than a gas state.
I don't understand. An hour or two of reaction fuel should get you anywhere in Earth orbit, including the Moon.DivineWrath said:I've been working on small craft lately. I've been giving them 4 units of thrust. I picked that number so that delta v is 1 unit. I also give them enough chemicals for power to last little over a day.
MegaTraveller Imperial Encyclopedia has tables with suggested travel times to orbit.DivineWrath said:I'm wondering if there are any resources for figuring this stuff out?
AnotherDilbert said:I don't understand. An hour or two of reaction fuel should get you anywhere in Earth orbit, including the Moon.