Author Topic: A cost effective hybrid vactrain/rocket launch system  (Read 1020 times)

Offline 852derek852

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Imagine a vactrain tube of the length required to magnetically accelerate a rocket to it's exhaust velocity. When this speed is reached, the rocket fires it's engines. A door opens at the end of the tube, the rocket flies out, and the momentum of the exhaust carries most of it out the end of the tube as well. The door is shut before any air can flow back in, and any residual gas is pumped out of the tube, readying it for another launch.

Rocket engines are most efficient at exhaust velocity, while linear motors are highly efficient at any speed, so it seems to me that the fuel savings would be massive. Is this idea plausible?

Offline QuantumG

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Jeff Bezos has billions to spend on rockets and can go at whatever pace he likes! Wow! What pace is he going at? Well... have you heard of Zeno's paradox?