Hull Resistance

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Hull Resistance

Hull resistance is the amount of force required to tow a vessel through calm water at a given speed and condition of load.


Calculating Hull Resistance

Bare hull resistance

Bare hull resistance is the resistance of a hull, without appendages or penetrations, under tow. This resistance comes from a number of components, such as energy expended forming waves and friction between the hull and water. The amount of power required to overcome this resistance can be determined by;


where P = power (kilowatts), R = resistance (kN), and V is velocity (m/s). Thus, it is useful to determine the value of RT for the range of velocities the vessel will operate within.

  • Wave making resistance
  • Appendages
  • Frictional resistance
  • Turbulent eddy generation
  • Coefficients

Reducing Hull Resistance

See also

  • Air resistance
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