From a few experiments flying control liners with nitro motors, I know that 2 motors on the same plane give you much more performance than one motor with the total displacement of the 2.
I have 4 matched 3536 1000KV brushless motors. Each can put out a little over 450 watts.
I want to build a couple of twins, or a B-17.
How heavy could a plane be in each case, with good flight performance?
I found a program for a Quadcopter, but not a multi plane.