cruz I've had a Magnum 52 XLS and a saito 72 on mine... the saito is still on the nose both have more than enough power but I like the 4 stroke over the 2. the magnum 70FS is under 22oz and it's on sale right now, unless I wanted outright speed(BAD with the twist)I'd go with 70/91FS over a .61 2 stroke any day. I like 6v on my 3D type planes but that 4.8 1100mah will work fine.

John