RE: 26 Size engine Zenoah or Evolution??
I use a G20 on a GP Big Stick 60 and it's just awsome and loads of fun for a weekend (no 3D) sport flyer like me. Several persons are currently using the G20 to successfully power their ULS, but when using the heavier G26 one trick to help maintain the correct CG is to shorten the nose by about one inch or so.
Karol