Correct me if I've calculated incorrectly, but if Cheech's Edge at 13lbs 14oz is running the Moki 1.8 which lists at 41 ounces, It would seem that a YS 140 that lists at 33 ounces could put this plane at 13lbs 6oz pretty easily? Not sure if the weights listed on the websites include mufflers or not.... Interesting to note that DPM lists the Edge prototype with a Moki 1.8 at 13.73 lbs and that includes a 3 oz pilot! He says with a YS 140, and no pilot it weighed 12.58 lbs. Must have been a batch of light balsa....