A webra 50, os 50 or irvine 53 vs a saito 72 or ys 63 should be your dilema. Every flier has different opinions on which is better, they both have advantages and disadvantages. If the plane is not much more than 5 lbs I would go with a saito 72. I think the throttle response of a 4 stroke is smoother and larger slower spinning props are great for hovering and harriers, but a quick spinup from a 2 stroke with a wood prop snaps a plane over in a waterfall much quicker. Buy both. Try both.
