Okay, I think i am getting it know
I understand the numbers probabley didn't exist but i was comparing something like a 70 4-stroke to a 90 2-stroke. 70's produce around 1 horsepower if i am not mistaken and a .90 is above 2. Arn't most 90's designed around 14 inch props. I don't have a 90 and could be wrong but am concidering one for my next plane.

Again, thanks for clearing this up for me. I almost feel embaressed asking because i have been running these little engines for some time now.