Fine.
However, we now know that flight implies the need for an energy source. A gliding aeroplane eventually runs out of kinetic energy (airspeed) and potential energy (altitude) at about the same time. A really efficient glider (sailplane) can capture an updraft as an energy source, but that too runs out.
And so late 19th century experimenters worked on propulsive devices to provide the energy for sustained flight, and some impressive engines were developed. But it was the Wrights who added the missing link: an efficient PROPELLER. With it, they didn't need a large engine. Four cylinders, 12 horsepower, simple (even crude) construction. With their propeller design, it was enough to do the job .
Last edited by barit1; 15th Jul 2015 at 15:28.