RE: Goldberg Chipmunk what engine?
I have flown it with a bunch of 2s engines from a beat up ST .45 to a ST91. Of the engines you listed I would say to go with the Satio 80. The 1.20 is pretty haevy and will kill any kind of glide it would have with a small engine. The O.S. 70 is a litttle under powered for the Chipy.
Dru.