Helicopter
The helicopter uses lift to fly just like an airplane. An airplane uses its wings to gain lift, however a helicopter uses rotor blades do the same as wings. The blades are basically spinning wings which are shaped the same as the airplane's wings. When the blades spin fast enough, they will eventually create lift in which enables it to fly. The shape of the wings and blades are commonly known as airfoil. In an airplane wing, the top of the wing is somewhat curved, while the bottom of the wing is totally flat. While in the sky, air travels across both the top and the bottom concurrently. Because both the top part and the bottom part of the plane are designed differently, this allows for the air on the bottom to move slower, which creates more pressure on the bottom, and allows for the air on the top to move faster, which creates less pressure. This is what creates lift, which allows the object to fly.