Different KMT from the &STATUS and CFORM


Q: Why, do I get a different value for KMT from the &STATUS report as compared to CFORM results for conditions that have trim?
REV 5.03

A: If you have zero trim, the program will provide the same result from both methods. This difference also occurs if the vessel origin is placed at midships. The reason for this is the axis transformation that takes place from the global to the vessel coordinate system. The GMT value we report in &STATUS is the derivative of the roll restoring moment (with respect to roll angle) divided by the displacement in vessel coordinates. The value we report for KMT with the CFORM command is the traditional naval architecture type value, in global coordinates.