Quote:
Originally Posted by Ulzgoroth
The OP's proposal literally keeps the rocket equation in! The only thing it changes is not having a high-energy exhaust stream.
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That's an important part of the rocket equation, and especially the rocket equation's tyranny. The tyranny comes from the fact that both momentum and energy are conserved, but energy increases with the square of velocity, while momentum increases linearly.
the coolant drops the energy part of the equation. Its odd, but I can see settings where it is the right option.