I have a Norvel .074 mounted in a 60" span Sig Ninja...Does a heck of a job, too.Think it's enough for that cub? OS fans to the contrary, the Norvel .074 will smoke those .10s. I have 6 myself, 2 .061s and 4 .049s. The .074 is the most versatile and well-behaved small engine I've ever come across.