Anonymous wrote:
I'm asking about rate of change, not absolute numbers so the assumption
of not changing the surface area and hull form is valid.

It may be valid, but is it physically possible?


.... It's an element
of calculus if you have studied mathematics.

Even if you haven't studied calculus, it's still calculus


To give a realistic
example, change the hull from smooth to one of those lapstrake types.
Leave out drag and reread the first three words of the title: "Rule of
Thumb".

Leave out drag? Wasn't the question about drag in the first place? So,
what is the new question?

If you want to know what the rate of change will look like, it will
increase geometrically with the initial velocity. Does that answer any
of your questions?

signed- Injun Ear (formerly known as Eagle Eye)