The 60 size Goldberg Bipe flys best on a 1.20 size 4 stroke. A 90 2 stroke flys it well also. Flying this plane on a 60 2 stroke really limits the ability of both the pilot and the aircraft.

Do some checking around on this and I think you will find that most people have stepped up the engine size for the Goldberg and other similar size Ultimates.

silversurfer