I bought my Wingo and the gear reduction and the 8x6 prop. I bought the recommended batteries. The DD with the stock prop WILL ABSOLUTLEY out perform the reduction kit with the bigger prop. HOWEVER, I didnt have the 9.6v battery. Im playing around with the idea of going to a 9.6 or so, to see if I can infact get some more performance out of mine. This is the first I've heard of going to a 9.6v. Im interested to find out more from anyone else.