In aeronautics, a spoiler (sometimes called a lift spoiler) is a device which intentionally reduces the lift component of an airfoil in a controlled way. Most often, spoilers are plates on the top surface of a wing that can be extended upward into the airflow to spoil the
When helicopters land in desert zones, sand grains strike the fast-spinning metal blades, creating a ring of white-hot sparks around the rotor. Called the Kopp-Etchells effect, it's often seen during night operations. πΈ: Camden Thrasher