Hi BigBear,
The link that Traddles gave you is the best place to start, as it contains other documents that you might find useful.
In addition, more information on Voith-Schneider propellers can be found here:
http://80.95.161.114/shipsim/forum/index.php/topic,2550.0.html (http://80.95.161.114/shipsim/forum/index.php/topic,2550.0.html)
Regards,
Marty