I have a 20-20 on a 23 oz Copperhead Extra and a 20 oz Airfoilz Yak. It easily overpowers each. With the right prop the 20-20 will get about 30 ozs of thrust drawing about 25 amps (not for more than 10 or so seconds before getting hot). Get a scale, weigh your plane, if it is less than say 26 ozs the 20-20 should be OK. Use a 10x5 to 11x6 prop.
You will get more interest in your post on the "Electric 3D" forum.