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Originally Posted by weby
The rocket engines are actually called thrusters in 2300AD and produce super science results.
The thrusters allow you to go down and up a 1g planet by using approximately 14.3% if the mass as fuel. (Rule is add 1/6th of the mass as fuel for that, but do not count that fuel as part of the mass. See naval architects manual page 9)
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That's less than I remembered.
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The fuel appears to be hydrogen-oxygen as it can be made in the fuel station by splitting water. The specfic impulse varies a bit depending things like the altitude but is normally below 400 at sea level on earth and below 500 in vacuum.
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That's not what the rules say.
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Originally Posted by NAM
Thrusters may only be added to ships which have MHD tur-
bine power plants. The addition actually consists of adding a large
reinforced re-ignition chamber to the power plant and thrust nozzles
at the rear of the hull. The MHD turbine is thus modified to func-
tion as a thruster. When in thrust mode, large volumes of addi-
tional fuel are added to the re-ignition chamber, burned, and ejected
as reaction mass.
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That looks like the fuel is being both burned and heated and it's some awful hybrid of an MHD turbine and rocket. That's super-science right there.