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I wonder if this could be solved for with detachable take-off booster. Gets you up in the air, then returns to the airport.

Couldn't you just start with a cable that detaches and is pulled back to the landing strip?

Just make sure it detaches properly, you don't wanta a dozen wire to yank you in mid ascend

A "third rail" along the runway and a dodgem/Scalextric type conductor springs to mind.