From Narciki

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

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*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;

- P
_{E}= R_{T}V

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

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

- Air resistance