There's a chap in Barnsley building something similar, he's got sponsorship from Tate&Lyle because he's using sugar as a fuel. It's smaller, and rather more complicated, but the unmanned test flight hit 89 miles altitude. [he was hoping for a 100, but there was a glitch.]
A staged rocket, would cut the gee force down to a manageable 4g, spreading the acceleration over a longer boost phase. But that significantly increases the complexity again.
The other solution would be to use a hybrid motor, solid fuel and nitrous oxide gas, this would mean you could pack more fuel into the rocket and have a more controllable burn, allowing you to have smoother acceleration. It would also allow you the option of turning the motor off in event of something going wrong. It's more complicated as motor, but it reduces the complexity of the rocket, because you can build it with enough fuel, and basically do something like space X do with their rockets and slow down.
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A staged rocket, would cut the gee force down to a manageable 4g, spreading the acceleration over a longer boost phase. But that significantly increases the complexity again.
The other solution would be to use a hybrid motor, solid fuel and nitrous oxide gas, this would mean you could pack more fuel into the rocket and have a more controllable burn, allowing you to have smoother acceleration. It would also allow you the option of turning the motor off in event of something going wrong. It's more complicated as motor, but it reduces the complexity of the rocket, because you can build it with enough fuel, and basically do something like space X do with their rockets and slow down.