Thanks. One of the things I tend to talk about is the potential
advantage of using rudders when twisting (swivel) as it tends to help
when you work into how you need to set your rudders to "walk".

otn

JimB wrote:

I like Jere's approach. It correctly describes both phenomena you
get using rudder with power; first, a rotation, secondly, a
lateral movement.

When teaching, I've found it useful to separate the two
phenomena.

First, how to point the boat. If you're static, that's using one
engine ahead and one astern to swivel around a point with rudder
neutral. If you're moving forward significantly (or aft) that's
using rudder or differential engine to steer.

Second, how to shift the boat (or part of it) bodily sideways.
That's using wind, and/or prop walk, and/or power with rudder
(the other engine being used to control the degree of fore/aft
movement), and/or bow thruster. The last three I certainly
understand as 'thrust vectoring' (I'm familiar with the term as
an ex VTOL pilot, and most numerate people would be OK with
'vectoring').

When teaching, though, I'd test my pupil's understanding of the
phrase before using it. After all, the student may be numerate -
as an accountant - rather than a physics major. And 'kicking ass'
does have a nice ring to it . . .

JimB, Yacht Rapaz, sadly, for sale to buy that nice new Greek
house:
http://www.homepage.ntlworld.com/jim...cification.htm