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To make a semi-intrinsic function from this expression. Define the following in the New Parameter, Object, Function window: 

In which Fwhich F_fn is fn is the name of the intrinsic function, using fn as top goal and require speed, g and length as require speed, g and length as input.

When you use this function for another expression you can now write:

with V the ship speed in [m/s], g the grav. acc. in [m/s^2] and GroundClearance the and GroundClearance the distance in [m] between ship bottom and bottom of the water it is sailing in.

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