I have a ST 91 with mousse can on mine, and 14x4W APC. Boy does it pull vertical! It was still a bit nose heavy even with the servos in the rear though and needed some tail weight. Fun plane. They don't seem to like to knive edge very well and they tend to pitch up with rudder input. Just the design but they are still a great sport plane and still popular after how many? years???

Ernie