I've only got an old, low powered Fox.45 up the front of my F1. Had to put a bag of ballast up the back because of this. The Fox is a heavy lump of iron!!

I think something like an OSLA.46 would be better as far as balance goes.

But the old Fox is very reliable and just the model flies nicely on 1/2 throttle. Power wise it is a perfect match for this model.