My dads Magnum 91 runs good, I was very impressed with it but it will barely hover his 8.5lb plane I built for him. I'll look at the Saito 100. I probably will have to cover the plane and get a good feel of the all up weight before buying the engine. Right now framed up minus the gear it weighs 3.5 lbs. I'd like to be at 7.5lbs without fuel but that may be wishful thinking.