resistance

…discussion, the effects of air resistance (to say nothing of wind and other more complicated phenomena) have been neglected. These effects are seldom actually negligible. They are most nearly so for bodies that are heavy and slow-moving. All of this discussion, therefore, is of great value for understanding the underlying…

…hull to steady forward motion—a resistance that determines the choice of propulsive power—usually demand the greatest attention from the naval architect.

The resistance to forward motion of a ship is of three principal kinds: friction; wave making; and separation or eddy making. Friction or viscous resistance is caused by the acceleration of liquid particles in a forward direction as the bow continually runs into a region of…