I have a Magnum .61 two-stroke in my VQ Zero with an APC 12x7 prop. Goes like a guided missile! Has to be going over 100 mph. I strengthened the stab by epoxying two strips of thin plywood to the bottom. And I also fiberglassed the center of the wing. I have flown it 25 or 30 times and the only problem is that the plastic parts are starting to crack. But I think that would happen with time no matter what engine you used.

I would be flying it now except I dorked it on a take-off roll, of all things! Didn't watch my rudder and it rolled into the grass and flipped. Not too bad, just knocked the stab loose and crunched one wingtip. Just haven't gotten around to fixing it yet.

As for manueverability, I don't think the engine choice (2 or 4 stroke) would have much effect on it. It's a great flying plane!