Thanks all.The engine I tried using is a SuperTigre 75.The plane is the old Sterling kit that was heavy and time consuming.The plane came out heavy 10 1/2 pounds because I needed to make it stronger.The wing span is 65 inches and the plans called for a 56 size engine but I knew a 56 or 61 would not fly it.I was also using a 12-6 prop.I have a Super tigre 90 which I will install now.All I want is it to fly Scale.Thanks again ALL
MJ