This is for a sci-fi story I'm writing, so the answer doesn't have to be perfect, just close as possible.
Can the lift fans on a F-35 be driven by a turboshaft instead of the jet engine If yes, which one? The jet engine that drives the lift fans in a F-35 is called Pratt & Whitney F135 engine. The engine dumps 20,000 shaft horsepower onto shaft that spins the fans. But i need a way to do this with a turbine, not jet engine with thrust coming from the rear.
I'm assuming that it takes a certain amount of shp (shaft horsepower) to spin the lift fans at the correct rpm. The fictional vtol is to have 4 lift fans driven by four turbine with little heat signature to avoid infrared.