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Helical engine

edwest

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But invention is like that. Uncharted frontiers and all.
 

DWG

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Sounds hugely inefficient at the very least.
Inefficiency covers a multitude of sins, this has a high energy input for the delivered thrust, but a low mass expenditure for the delivered thrust. Its mass efficiency varies with how fast you want to go. Probably very poor at lower speeds given all the infrastructure of power-plant and 200m drive you're hauling around, but improving rapidly as the ultimate speed grows, especially as you increase towards significant fractions of C. This isn't an engine for Earth orbit, it may not even be an engine for Earth to Mars, but for interstellar missions it's a potential competitor with Bussard ramjets etc. (If it works).
 
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