lASER 3D, ENGINE
 

We had one at our fly-in that was Saito .72 powered. It had huge amounts of throw with digital servos everywhere. He could hover it at half throttle. It did the tightest loops you have ever seen. It looked like the fuse was spinning around the C.G.
That would be my pick. I don't know what prop was on it but he did run 30% heli fuel.
later daveo