RE: Rimfire / Multiplex Cularis
If 250W is enough, and you don't need bigger than a 10" prop... sure it will.... but I suspect that such a large plane might be better off with a bigger folder (12"-13"?)... and thus a bigger motor.
I see some reviews etc that indicate ~60oz weight and the stock powerplant is a HC3522-700 400W motor with a 12x6 folder.... I fear your Rimfire won't cut it.