Guys, i'm wondering if we are talking about the same Christen Eagle. The Upper wing is 50" and the lower, 47". This thing has to take something alot larger than a ST 50. My trainer has a single wing and its span is about 55" and that takes a .46. This Christen eagle is pretty big (wide body). The input is well appreciated, thanks. Its sitting on my work bench (dining table) right now just waiting for an engine. Without a manual i can't figure out where exactly to put the engine mount.....Help.......