Well, here's a couple of pics of my Great Planes Fokker with an Echo 23.6cc engine. It flies great, with plenty of power, and I didn't have to add any ballast anywhere to get the c.g. to come out right.

If I remember right Tower sells it for $249.00, and they usually have discounts for 15 to 25 bucks off a purchase that large.

On the sporty side, here's also two pics of my 72" wingspan Katana 140. It flies SUPER on it's hopped up Echo 23.6cc engine, and also did not need any added ballast to balance. Nitro Planes sells it for around $160.00

Then here's a pic of a "bashed" design of mine. Big Stik tail feathers and wing, and a custom fuselage. Homelite 25cc engine. I designed it with the nose too short and it was tail heavy. So later re-engined it with a Homelite with the magneto for extra nose weight. I flew it a lot, then sold it to a friend that flies the hell out of it!

Basically anything that weighs from 10 to 14 lbs. and has 1000 square inches of wing area or more will fly fine with the 25cc class converted engines.

AV8TOR