1. "the Wrights calculated they needed an engine that produced at least 8 horsepower and weighed no more than 200 pounds (91 kilograms)."
No such engine was available in the market, so they designed/and made one
They choose aluminum... They painted black - so people did not know the metal (avoid copy)
2. Propeller: Navy's propeller designs were "cut and try".
They used the wind tunnel.
"propeller was a wing traveling in a spiral course".
"90 pounds of thrust to sustain the Flyer in flight at 24 mph" - "combined thrust of between 120 and 130 pounds at 330 rpm"
3. wind tunnel
4. "a highly unstable but controllable machine" (Like Bicycle, flights too...)
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