[MHml] Shaft driven instead of saildrives?

[Bill Gibbs]

         Reply to:   RE: [MHml] Shaft driven instead of saildrives?
Sonrisa has shaft drives on her twin diesels.  This allows the diesels to be mounted more amidships, reducing pitching.  They live in a box whose top acts as a step from the cabin into the hulls.  Sonrisa is 40' long.  I'd guess the engines to be about 12' forward of the transoms, with the props about 7' forward of the transoms, in front of the spade rudders.  The props are protected by the hull profile, as are the rudders to a large extent.  These are well documented advantages of a shaft drive, but I don't understand how you'd do this with the engine aft.

Bill Gibbs

On 3/14/01, Wiets Wilken wrote:
Thanks for all the advise regarding saildrive protection.

A saildrive is easy to install but prone to be damaged in a grounding. Acting on sound advise from Mr.
Kurt Hughes, I am also considering a shaft driven system instead of saildrives. Does anybody have ( and
willing to share ) typical drawings or sketches of a shaft driven installation ans setup? I intend using
40 - 50 HP Yanmar's and the current design requires that they be located close to the transoms.

Issues which is not clear to my is whether the engines are mounted at an angle, or;
Is the engine install level and the shaft is angled by means of some type of universal joint?

As always, all advise is much appreciated.

Regards

Wiets



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