![]() ![]() The aerodynamic forces on the entire object can be measured, or on individual components of it. Different measurements can be taken from these tests. The object can be an aerodynamic test object such as a cylinder or an airfoil, an individual component of an aircraft, a small model of the vehicle, or, in the largest tunnels, even a full-sized vehicle. Usually, large fans move air through the wind tunnel, while the object being tested is held stationary. Different wind tunnels range in size from less than a foot across, to over 100 feet (30 m), and can have air that moves at speeds from a light breeze to hypersonic velocities. They are used to test the aerodynamic effects of aircraft, rockets, cars, and buildings. Wind tunnels are machines where an object is held stationary inside a tube, and air is blown around it to study the interaction between the object and the moving air. A model Cessna with helium-filled bubbles showing pathlines of the wingtip vortices ![]()
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