Re: the Kelvin Wake again

[Leigh Palmer <palmer@SFU.CA>]

I said:

> Kelvin wakes pertain only to displacement boats.
> Boats that are hydroplaning (such as some of the
> speedboats you see) don't leave Kelvin wakes.

On second thought, planing boats probably do leave
Kelvin wakes, but they are likely of very small
amplitude and they may be swamped by the turbulent
wake of such a boat. The stern wake of a ferry is
not a Kelvin wake either. Look at the bow wakes of
the displacement craft, from ducks through tugs
pulling barges. You'll see lots of Kelvin wakes,
all opening at 39 degrees.

Leigh