no, jim, what you see was quick typing on my part. "prop walk" is always to
port (on my boat, a rh prop) because I only worry about it when backing up.
Going forward I use the rudder to counter, something I can not do when backing
up until the boat is moving. I typed the tranny in forward and just typed prop
walk port. In forward, the prop walk is starboard.

quick typing, that's all. asym thrust is asym thrust. someone even quoted
Chapmans on the issue.

you are right, gould. prop walk in forward would be starboard
because the prop
is turning cw as viewed from behind.

btw, Chapman's is correct as far as asym thrust is concerned,
but end-plate
effect would add to the total lateral force.

In your language - a flip flop?

I seem to remember about a week ago that I challenged your
explanation of prop walk (the aeronautical simile) with a bit of
trig to point out that the asymmetric thrust effect is
insignificant compared to hull interference (you call it end
plate effect?).

What I missed, in fact, is that it is even in the opposite sense!

JimB