On Tue, 09 Oct 2007 00:59:59 GMT, Short Wave Sportfishing
wrote:

So if I read that correctly, and I might not be, using a single rudder
would be similar to applying vectored thrust as you do with an
outboard, but not so with twin rudders?

There are some similarities but also some differences. With an
outboard or I/O the vectored thrust works in both forward and reverse.

With inboards vectored thrust is possible only in forward because the
prop wash has to react against a rudder to be effective. That can be
useful in certain situations such as the "back and fill" maneuver with
a single engined boat, or "walking the boat sideways" with twin
engines.