wetted surface
The amount of area of the hull, keel, rudder, and other objects that is under water.
wharf ...
wetted surface - The hull's area (including rudder) in the water, affecting speed.
wharf - A structure for docking vessels, which is parallel to the shore.
wheel - The steering wheel; the helm; the propeller.
wetted surface
The surface area of a boat's underbody and appendages.
wharf ...
Racing yachts try to reduce the wetted surface area, which creates drag, by keeping the hull light whilst having a deep and heavy bulb keel, allowing them to support a tall mast with a great sail area.
The turn of the bilge is on the soft side aft but there is still a lot of wetted surface aft. With all that beam aft it would be very easy to start pulling a single rudder out of the water as the boat heels.
The fin proper gives lateral resistance in an almost perfect form, for there is no deadwood either forward or aft and the least possible amount of wetted surface.
The velocity of rubbing is assumed equal to the speed of the ship, any slight variation due to stream-line action being neglected. The wetted surface S, when not directly calculated, can be estimated with sufficient accuracy by the formula S 1.
Unless the boat is planing you need to try and keep the boat as level as possible fore and aft. As soon as the boat gets up on the plane you can move your body weight right back quickly so there is less wetted surface.
 See also: Boat, Hull, Sailing, Sail, Rig
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