Orville Wright — American Inventor born on August 19, 1871,

The Wright brothers, Orville and Wilbur, were two American brothers, inventors, and aviation pioneers who are credited with inventing and building the world's first successful airplane and making the first controlled, powered and sustained heavier-than-air human flight, on December 17, 1903. From 1905 to 1907, the brothers developed their flying machine into the first practical fixed-wing aircraft. Although not the first to build and fly experimental aircraft, the Wright brothers were the first to invent aircraft controls that made fixed-wing powered flight possible... (wikipedia)

If we all worked on the assumption that what is accepted as true is really true, there would be little hope of advance.
The airplane stays up because it doesn't have the time to fall.
With twelve horse power at our command, we considered that we could permit the weight of the machine with operator to rise to 750 or 800 pounds, and still have as much surplus power as we had originally allowed for in the first estimate of 550 pounds.
No data on air propellers was available, but we had always understood that it was not a difficult matter to secure an efficiency of 50% with marine propellers.
In our gliding experiments we had had a number of experiences in which we had landed upon one wing, but the crushing of the wing had absorbed the shock, so that we were not uneasy about the motor in case of a landing of that kind.