For the next two years, Will and Orville used their bike shop as an invention center. Using a bike as their first testing device, they performed
airfoil experiments. Pedaling their contraption as fast as they could was exhausting, so the brothers invented a wind tunnel into which they placed two homemade devices - one to test lift and the other to test drag. The blower fan, which was driven by an overhead belt, created winds up to 35 miles per hour.
Writing down all their observations on strips of wallpaper, they ultimately compiled their findings into a notebook. Among other important conclusions, the brothers determined the commonly accepted coefficient of lift was too high and a wing produced more lift if it had the shape of a parabola.
Using the data from all their experiments, the brothers built a reworked glider in 1902. It was the
first aircraft that solved the fundamental problems of flight:
lift and
three-axis control.
Once the brothers were able to achieve sustained and controlled flight, based on their calculations and field tests, they constructed a larger version of their 1902 glider. They called it The Flyer. Most folks today know it as Flyer 1 or the Kitty Hawk.
But Flyer 1 would be an airplane, not a glider. Will and Orville needed to figure out how to use a propeller in the air. Although they looked at shipbuilding literature, it didn't help them. There was no theory of propulsion. At the time, no one truly understood a propeller is nothing more than a wing rotating on its axis which lifts the plane forward.
Once the Wright brothers reasoned through this fundamental tenet of self-propelled flight, they were ready to build
their power source. It was a 4-cylinder, 12 horsepower gas engine they built with the help of their mechanic, Charlie Taylor.
The Wright brothers had been in a race to see who could develop the first heavier-than-air powered flying machine. Samuel Langley, the distinguished secretary of the Smithsonian Institute, had developed an Aerodrome. When it crashed on launch, though, Langley left future experiments to the Wright brothers.
Langley wasn't the only competition the brothers faced, however. They had to press forward. It was time for another trip to Kitty Hawk and Kill Devil Hill.