I think the goldberg ultimate is a very formidable acrobat.

I had mine modified with bigger elevators and rudder. This is one plane you can do knife edges from horizon to horizon. also flat spins are a blast!!! and it recovers and an instant. Blenders are crazy and yeah i almost gave a couple of heart attacks to the guys watching me do it. I did'nt even had tail wires LOL!!! Bwahahaha

I also managed to waterfall it . That was before my engine dogged down and ever since could'nt get the power back.

I'm considering on installing a 21cc Echo grass cutter engine on it. Its extremely lightened with a custome muffler.