The frictional resistance is a force that is generated when the underwater parts of the boat and the water around are in relative movement (the boat moves through the water, or, in other words, the water passes down the boat). Therefore, it is a hydrodynamic force, and as a resistance, it works in the opposite direction to the movement, trying to slow the boat down.
The frictional resistance is due to the energy lost by the boat in overcoming the forces that tie together the molecules of water surrounding the hull and its appendages and in creating the eddies that are left behind. This phenomenon happens in the boundary layer.
Fill in each input with the appropriate value:
- Introducing the hull.
- Hull appendages, planforms, and wing sections: what are they?
- What is the Froude number?
- What the hydrodynamic resistance is and why it matters.
- Calculate the frictional resistance of the hull.
- Calculate the frictional resistance of the keel.
- Calculate the frictional resistance of the rudder.
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