Hull 
Knowing the hull shape and geometry is one of the most important factors for predicting a boat's performance. Hull shape describes not only length of waterline while sailing, but also displacement, wetted surface, and the volume distribution along the hull from which hydrodynamic forces of lift and drag can be calculated. It is the only way to address properly these calculations through the Lines Processing Program (LPP) that calculates all relevant hydrostatics data used by the Velocity Prediction Program (VPP). A hull measurement is performed to create an offset (OFF) file describing the body plan of the hull together with appendages, by using an ORCapproved hull measurement machine or any available measurement instrument capable to produce a list of the points in the coordinate system defined as follows:




Hull is measured by taking half width (Y) and height (Z) of station points with equal distance from stem (X) from the deepest point to the sheerline as follows:



