I also mention belt drives in this site reference These type of drives eliminate the 90 degree geared shafts so larger HP diesel power can be transmitted, and the rotation centers might well allow for retractability. I don't show any retractable sketches on the website, but I've drawn a few. I was talking fiber-belt drives that are seeing a lot of industrial application now. Somewhat recently PYI has pursued a similar idea (although not retractable at this moment) utilizing a 'Morris' steel chain belt. The most popular utilization of these 'belts' were in the connection of the engine and the transmission in the Oldsmobile Tornado. I think they also saw some application on old industrial pumps used on fire trucks? Brian Eiland beiland@usa.net www.RunningTideYachts.com distinctive expedition yachts