I would go for a big, honkin', fixed, six-bladed prop in a tunnel,
designed as a system and driven by hydraulics. A streamlined
door on each end of the drive could be closed when under sail
to minimize drag.

For maximum thrust in reverse without a tendency to side slip
one needs tunnel drive. It works for most of the big tugs on
the Western Rivers it should do the job on a relatively lightweight
yacht.

CN


"Bart Senior" wrote in message ...
2 points

After hitting the lottery for big bucks, you have nearly completed
your 150' new sailing mega yacht. Included on your new toy are both a
bow and stern thrusters--for side-to-side control..

What sort of prop would you want if you were concerned about precise
speed control, and being able to back down nearly instantaneously?

Money is, of course not a concern.