RE: Excelleron 90
I have an Excelleron 90 with a YS 110 4 stroke in it. It's a dream to fly. Made a couple of mods on it with the help of Troy N and Tony F: used push rods instead of cable, and changed hinges. Had to reinforce the landing gear. Have had no trouble with the engine mount at all.
It's a beauty of a pattern plane.
Terry