In order to take off from the ground the Wright Flyer had to utilize Bernoulli’s Principle. Bernoulli’s Principle states that whenever a liquid gets faster (in this case air), it has a drop in air pressure. With the propellers moving the plane forward air hits the wings of the plane. Air goes both above and below the wing, having to travel faster above the wing due to it's longer curved shape than the bottom. Decreasing the amount of air pressure on top of the wing with more on the bottom. Since the air pressure on bottom side of the plane is greater, it exerts a enough air pressure to start lifting the airplane off the ground, making the plane fly.