I have a Ambroid Whipsaw ( Small one ). The wood is heavy, this thing is built rugged. There's a internal piece of ply in the root area of the wing unlike anything I have seen before. The leading edges and trailing edges are very heavy for such a small plane. My dad built this plane somewhere around 68-69. I flew the plane with a MAX .10 on it and DESTROYED it. The problem was the short nose and the wing root which doesn't allow for a tank. Not knowing any better I placed the tank directly on the wing, set it off singing away and pulled it inverted after a few laps. It just shut off and went in upside down. I was flying in a parking lot. Needless to say my dad wasn't impressed and made me fix it. I never flew it after that and it's been hanging for years. Now that I'm more knowledgeable on how to deal with this, I want to give it a go once again. I still have the Ambroid Eagle decal in the box, it appears like it would actually work still.