jaka

Hi!
Webra .40 GT is the strongest running standard .40 engine available using a standard silencer and 80/20 fuel (which it trives on).
It turns a 10x6 Graupner cam prop (or old gray model ) or RAM at 14000 rpm or more , this can no other .40 engine do except Jett or Nelson.
Do not use a big heavy .50 or .55 engine.
Balance is no problem. Move servos and reciever /battery as far rearward as possible ...if requiered.
Balance should be where Great Planes suggest. Think it is 3" from leading edge.
Why not compete?? It's the most fun you can do in R/C...