Hull Speed

If I may continue on the "off-topic" line just shortly, I must confess that the use of "dynamic" in connection with a static phenomenon bothered me when I first dealt with the stability issues, just like Daiquiri and DCockey express. But there is in fact a rationale in the term.

When a hull is in a heeled position due to a heeling torque acting upon it, the stored energy (=work) has the dimension kg*m^2/s^2*rad, and we see that the dimensions mass*velocity^2, that are the basis for all dynamic processes, are represented. In this context, "dynamic stability" has a meaning, even in a "slow" process.

That said, we still need a relevant term to describe the impact of longitudinal motion on stability; not only in the case of a dynamically supported hull (ie when a considerable part of lift forces are resulting from velocity), but also the changes in a displacement hull with a varying wave system. For lack of a better term, I have been using "velocity induced stability", (or lack thereof), but I'm open for better/shorter ideas. Anyway, until we decide what to use, there will be misunderstandings between engineering disciplines.