RE: Goldberg super Chipmunk build
I built one of these 2 years ago and it is one of my favorite planes. I have a Magnum .91 on mine. Plenty of power. The only problem is that the inverted Magnum loads up very easy. It took me a while to get it tuned. Rolls and snaps are quick with this plane. I was surprised just how aerobatic it turned out to be.