ORIGINAL: HUNTERANDJEFF
RC guys 48 cc twin gasser for this plane? It is featured in the December issue of FLY RC 2007. They claim it is smoother operation and less vibration than a single cylinder. It will spin a 22 X 8 prop at 6790 rpms.
I have a couple LS Pro 50 Twins, they are very similar to your motor. They are very smooth, one is in a 17 pound plane, it hovers it with a 22x8, but just. I love the motor, I'm putting the other one in a 80 inch Edge that I just picked up.