I fitted a 12 oz Du Bro tank in its place, but the Dubro tank must be mounted sideways. Needless to say it was definately running a whole lot better.

It's not necessary if you're in a hurry, but I can recommend it before you get to grips with too much!!

Flapperons will also help this model make a much tighter turn, although be careful with bigger IMAC/3D ships, it may cause them to stall violenty.