RE: Hammer 40
I believe the company that use to kit them was Davey Systems. I still have one that I built from plans about ten years ago. I can't really say how well it flies since I only flew it about half a dozen times. I did lighten up the tail on mine, but that canceled out when I made a foam core wing for it. I also built it as a tail dragger , just because I prefer the look. I think maybe this year I'll repower it with an up to date engine and have some fun with it.
Maurice