RE: Help Me Pick the Engine
The YS 110 and Saito 1.50 will fly 9lb 3D planes adequately. I had the YS in my 8.75lb 69" Yak and it was more than enough power. I don't see the need for something so big, heavy, and expensive in the 7.3lb U-Can-Do .60. These engines are also in a much higher price category than the Magnum and TT .90. Of course it is all personal preference.