Wetted area
Encyclopedia
In sailboating, the wetted area is the area of the hull which is immersed in water.

In aircraft
Aircraft
An aircraft is a vehicle that is able to fly by gaining support from the air, or, in general, the atmosphere of a planet. An aircraft counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines.Although...

, the wetted area is the area which is in contact with the external airflow. This has a direct relationship on the overall drag of the aircraft.
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