Why did the Wright brothers construct their own wind tunnel?

When they ran their tests, the Wrights only allowed one person in the room, and that person always had to stand in exactly the same place. Why do you think they took this precaution?

How does the angle of attack affect the amount of lift?

As angle of attack increases further, the upper surface flow becomes more and more fully separated and the airfoil/wing produces less coefficient of lift. Above this critical angle of attack, the aircraft is said to be in a stall

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Why did the Wright brothers construct their own wind tunnel? When they ran their tests, the Wrights only allowed one person in the room, and that person always had to stand in exactly the same place. Why do you think they took this precaution? How does the angle of attack affect the amount of lift?

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