The powerplant for the Wright Flyer was a juggling match between pulley diameters, prop sizes, weight, belt drag on the engine, lack of cooling for the engine..but in the end I got what I think was enough thrust to make a well executed model fly....I just haven't "executed" that end of the project well enough yet.
I built a depron based airframe and a balsa stick and cellophane covering airframe..neither flew.

The best flight of the plane was a gradual glide to the ground 30 feet away with no response from the ailerons [that I shamelessly installed].
After this outcome..other projects seemed to beg for more attention.....