Windage
Windage is a force created on an object by friction when there is relative movement between air and the object. There are two possible causes of windage: the object is moving and being slowed by resistance from the air a wind is blowing producing a force on the object The term can refer to : either, the effect of the force, for example the deflection of a missile or an aircraft by a cross wind or, the area and shape of the object that make it susceptible to friction, for example those parts of a boat that are exposed to the wind. Aerodynamic streamlining can be used to reduce windage. There is a similar hydrodynamic effect to windage.
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