I have a os 50 sx on it and it works great. The problem with putting a wing on when you don't use the removeable wing kit is that you have a split fuselage. The wing and motor mount have to be glued to both the top and bottom of the fuselage at the same time. It gets interesting trying to keep the motor mount centered and the wing squared while you try to figure out how to apply pressure along the fuselage to keep the pieces together while the glue sets. you can worry about the fuselage tube after the wing dries to the fuse. With the removeable kit you can assemble the mounts to the fuselage while you still are on the building where it is easier to work