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Originally Posted by PTTG
I'd say it takes about an hour, maybe more if it's large or crude, less if it's small or advanced.
It's not a physical object -- it's a charged plasma field.
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A huge superconducting loop mounted in front of the spacecraft that interacts with charged particles from a star’s solar wind to generate thrust.
Spaceships, page 25
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That's the physical structure of it. Whether it can be retracted or "deactivated" I don't know. I'll go with the 1 PPh energy estimate though; it makes sense. (A small "Energy Bank: Battery" should be enough and could be recharged by 2 small Fission Reactors in 1.5 hours.)
Dalton “now only if my other questions are answered” Spence