Retractable 360 propulsion unit for sailing yacht

[winchgorilla]

Thanky you Brian on your info,
I was allready on Brunvoll site but at that time they didn't have anything what would really fit to my problem, but with this new info about Van der Velden there is maybe something in.
Thank's a lot on your help!!

[brian eiland]

Originally Posted by winchgorilla

... but with this new info about Van der Velden there is maybe something in....

Actually it appears as though AIR Fertigung reference http://boatdesign.net/forums/showpos...9&postcount=11 may be further along the development path?

[red baron]

Originally Posted by winchgorilla

Hello to everybody,

I have only one last step before I officially become a Naval Architect, and that is to make a diploma project.
For a project I have take a 24m High Performance Racer/Cruiser, but because I like challanges and not to have the easy task, I have choosen an CBTF design with canting/lifting keel and lifting forward foil and ruder. Also in my design I would like to install 2 retractable rotating propulsion units, one in front and one behind because when the ship is in shallow water,rudder and foil should be a little bit retracted.
I'am searching for a solution like on Neriida, ex Wallygator (from Wally yachts), but the problem is that I can not find anywhere on the Net any name or firm which is producing such a unit, and the yachts which have this solution, they don't name it or mention it.

Everybody has a bow or stern thruster or there are some solutions with strong outboard engine with shortened Z-leg or something.
I have predicted that I need totally a 187kW of propulsion power, so I would this cut in two parts with one engine(Cummins,Yanmar) of 110-120kW and onother one with 70-80kW.

So please if anybody knows how to solve my problem, with retractable rotating bow and stern thruster/propulsion, tell me please. In my project, money is irelevant.

Also another question: Has anybody ever seen a system of retractable rudder, forward foil system? Also didn't find it on the Net (the hole system), just read about it, for some expensive sailing yachts. Any special advice.

Hi,
I belief I can help. What you need is a so called Voith-Schneider propellor system. This sytem was developed for commercial vessels. A German company Hübner-Braun offers scaled down units for sailboats. Try this link:
www.irisoft-yacht.com/hubner-braun-en/home.htm
Good luck !

[FanaticalWind]

Hi,
this link to the site of SPW GmbH in Bremerhaven, Germany is current and offers the Hübner-Braun propulsion unit as a custom-build (apparently not enough orders yet to go to series production.)

http://www.spw-gmbh.de/eng/hb/index.html

As they say in Germany, Mast- und Schotbruch!