I had a 70 Surpass on mine and it was plenty of power. I lost mine this weekend due to a structual failure of the rudder while doing a knife edge. The plane was built as per plans with the rudder servo being installed in the fusealage rear end. The rudder failed at the control horn. The balsa in both directions cracked and left the control horn hooked only to the push rod. The loss of rudder forced the plane into a complete nose down attitude and I was not quick enought to catch it. It hit square on the nose cone. The plane was a total loss. I have learned that a push pull linkage might have helped but definantly use harder wood on the rudder or run strips of carbon fiber on the support's. Great flying plane, Good Luck, Dave