I just received my Balsa USA stingray 120 and it looks like the Ryobi engine will fit this kit real nicely. The firewall will have to be moved back about 3" from the plans, but that should not be a problem. The Ryobi has the carb at the rear of the engine that makes it a little longer than the others out there. By moving the firewall back 3" this will put the extra weight of the engine closer to CG. I plan on putting the servo's for the elevator and rudder to the rear of the fuselage, this will also help out with the CG. The gas tank will have to be installed under or close to where the wing mounts to the fuselage. By doing all of this I hope the CG will not be a problem. The plane weighs just under 9 lbs built and the Ryobi weighs 4 lbs making the bird about 13 lbs. She has a wing area of 1276 sg in and an 83" wing span. I believe this will make a good flying combination.

Thanks

Jim