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Originally Posted by nKoan
well, the VTOL jets turn off, and the main jets take over  |
As far as I am aware the current "in use" VTOLs, Harrier, and V-22 both use their main engines for both vertical and horizontal flight by means of rotating the engines themselves(V-22), or the ducting(Harrier) behind the engine to redirect thrust.
I think one of the JSF designs had/has an additional lift fan, but the main engines do most of the heavy lifting.