Converting to electric
 

I have a Sig Hummer that I want to convert to electric power. It is a 34" span, 212.5 square inch wing, 20-26 ounce (wet power) sport flyer, aerobatic sort of plane, for .049-.051 glow power. I was thinking that a direct drive astro 05 cobalt on seven or eight cells would do the trick, but thats pretty much a guess. So what do you think?
Thanks ,
Kurt