fly4fun- I am running the Rimfire, and 3 cell 640MA or 800MA Lipo in a Shock-Flyer with great results.... From what I understand though the Yak, as mentioned by exeter acres, is supposedly VERY impressive!

Also sounds like flipz has tried a few projects with good results--- If you wanna get in on the 3D foamie craze (and I recommend that you should- ) get anything that will be under 10 oz. 8oz is preferred- The Yak-Shocky looks cool, I would stay away from the Flatouts though they are built well but the cost and weight, put it at a disadvantage- In my opinion, anyways...

ENjoy!