I had one with an OS .50SX on the business end. This engine is a perfect match and plenty of power. I ran a Zinger 12X4 prop on it but its not much for 3D. If you use high rates on the Ailerons it will spin so fast it's hard to keep track of just how many spins it does, just how I like it Take offs are within 15' and lands like a trainer. It built tail heavy with not much room to move things around in the fuse. I had the battery pack standing up next to the firewall and it was still tail heavy. Had to add a weight to the nose but with the OS .50SX up front you never know the difference. Great little plane. I have mine for sale, moved to Profile planes.