I had an early version one with a ST 51 in it as well. Very nice flying small plane. The early ones had a contorted split rod for the elevator that had a lot of flex but the new ones are differant. I sold my first one and I missed it so I have since purchased another one. The new one is made nicer than my earlier version one ie. laser cut. I have purchased a YS FZ.63S for my new one, it should have power to spare. You may want to consider mounting one or two servos on the rear of the fuse if you are nose heavy with the Super Tiger, my old one was a little nose heavy with the servos in the stock position. I will probably have to mount them at the rear of the fuse on my new one and I think my YS is about the same weight as the Super Tiger. I think you will enjoy flying this plane.