Froude number

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Froude Number

The Froude Number is a dimensionless number used to describe the resistance of objects while moving through water. This provides a method for comparing multiple objects that are of differing sizes and have different underwater forms.


Developed by William Froude in 19th century as a method for reliably predicting the resistance of water on floating objects.


For a ship the Froude Number is as follows:


  • V = Velocity of ship
  • g = acceleration due to gravity
  • L = Length of ship on the waterline
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