Not an X-45 but a friend flew one with a Wren 44 Gold turbine.
Not a wonderful result, the Falcon 120 is a big, draggy aircraft & it had to fly at high throttle
settings to make headway & was a slow upwind, fast downwind model. While it was light
it would waft around & not fly jet like at all. At least take off & landing speeds were low.
He only flew it twice & bent the crappy standard wire undercarriage legs on the second landing.
At this point he lost interest in it, removed the gear & engine & gave it away.