It'll be 6 oz overweight in the nose. You want a 3-d plane to be a little tail heavy. It should work, but it may land pretty hot, and dead stick landings could be real tricky... If one of those 4-strokes are only marginally more expensive, then I would suggest one of those, the sudden torque is alot of fun. I have an O.S. 91 4-stroke on a U-Can-Do 60. With 25% cool power and a 15 x 4 prop, it hovers at less than 1/2 throttle. That little plane should be plenty fun with an FS-70...