wessman,

I think the Rossi 53 is a definatly not the correct choice for this sort of model. I used to own one and whilst its a cracking motor with a lot of power for its size, its designed to be used with small high reving props around 10 inch size. If you try and put a prop on that'll be good for 3d you'll find that it doesn't develop the power of throttling you want. If you've already got the engine tho I'd say fit a mini pipe and see how you get on. Best of luck...

Andy