I have a Goldberg Tiger 120. It is just about as heavy as anything you could get (as an ARF out of the box). My engine of choice is the OS 1.20 AX. I've been flying this aircraft with this engnie ever since I bought it and it flys just great. Has plenty of power, lots of vertical, and starts up immediately, even when cold and setting for weeks. You cannot go wrong with this engine. I have three of them, and love them.

CGr