I have come across an airplane not knowing what size engine to put in it. It is called a "Soft Touch" 90 inch wing, 1425 in wing area, high wing. It is a very strong stuture. The plane weights 12.5 lbs empty. I have seen these engines for sale, used, relatively inexpensive. Am I even close to the right size engine?
MDS 2.18
magnum 1.8
Supertiger 2350
Any input is better than what I know about the big birds.