I am builting my own scratch built aircraft. It has a 20 inch wing span and a near fully symetrical airfoil. I would like to get an glow engine for it that isn't to heavy. What size should i get? I have seen .061 and .07 engines for sale at towerhobbies.com but are they to big/heavy for my wing/airfoil?
P.S.- If you want pictures i can get them for you.