I have one I built in the '80s with an OS FS 90 4 stroke mounted inverted. This is the second FS 90 I've had on it. The engine is no real powerhouse but flies the plane very well and at a rather constant speed with a nice mellow sound. The model was built with cutouts in the wing/stab/fuse, home made maple/ply engine mount and single fixed main gear with tip draggers on the wings. Dry weight is 6 pounds 13 ounces. The plane is a real pleasure to fly.

Terry in LP