I flew my 60 Sunday, nice and easy with OS 91 Surpass 4 stroke. I love this plane. It flies a lot differently than my 40 size. The 40 has a 46 AX and it is fast, control throws maxed, it can be a handful. I don't have the throws maxed on the 60, but it is nice and relaxing. I like them both, but if I could only have one, I'd take the 60.