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Elo comments on Crazy Ideas Thread - Less Wrong
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If one were to build a cannon (say a large, thick pipe buried deep underground) and use a nuclear bomb as propellant, could they achieve anything interesting? For example, boost a first stage payload to orbit, or perhaps Earth escape velocity? The only prior art I know of for this is the Pascal-B nuclear test shot.
A variation - an acceleration chamber like a synchrotron (or other circular acceleration system), with a flick to release a payload towards space. not sure if it would be viable on something heavier than a particle, and what would happen. to the payload being stretched in various G-forces, or how high you would get. (not being up on my physics enough to say if it would be catastrophic or viable)
I think all you need to do to release the payload is to stop flicking it, so that part should be easy.
I guess,
so: