Hi,
The groovy 50 3D is a good flying airplane but the sides of the fuse is built cheap and the wings can loosen up easly where the spool pins go into the side of the fuse. I did have a Saito 65 in the plane that was a perfect match for it but I wanted more power so I put a Saito 100 in and the thing is now unbelivable. The plane will climb straight up verticle at a little under half throttle. But one thing I had to do to this thing was strengthen up both sides of the fuse, the landing gear mount that I used 1/4 in thick plywood and low bounce wheels to take out any shock. With what I did to the plane as far as adding weight had no affect on the huge 100 motor. The only problem I am now having trouble with is prop clearance. i need a larger prop with less pitch so i can get it to hover the way I want it to. But I think that this is a well performing 3 D plane.