I've got a set of plans for this plane. According to the plans: the wing chord is 16 5/8" (including the aileron) and the wing span is 81". The plans show the wing chord without the aileron as being 15". The recommended flying weight is 11 to 14 lbs. and the recommended engines include the Saito 270/300, Quadra 35 to 40 cc, OS 240 twin. The balance range is from 4 7/8'' to 5 1/4" back from the leading edge. You mentioned that the plane you have has a wing chord of 18.5. Perhaps the builder added some width to the aileron???

Hope this helps.

I flew the Super Hots years ago with an OS .60 and it was a wonderful flyer. I picked up these plans with a nostalgic twinkle in my eyes! Haven't built it yet but if I did I would throw a DA50 on it with a 3 blade prop. It might come in a bit heavier than recommended but with that big wing it would still fly great! Built light I think it would fly great on the DLE30 as well.