[PCW] Fin stabilizers on cats

[Mark]

It's not so much a stabilizer as a passive hydrofoil.  Do a search on "Hysucat", HYdrofoil SUpported CATamaran, or Hysuwac, invented by a professor in S.A.   A variant is used on several of the ferries that run to the islands here off the Southern California coast.  Various people have used it to build pleasure boats from 5m Ribs to 50' cruisers.   All the versions I've see were used with planning/semi-planning hulls.  Just as there are high and low speed wings on aircraft, I'm not sure if there is a barrier to using it at lower speeds.    Since you need more lift at low speeds that will have to come with more drag, so if you are willing to limit top speed to say 15, maybe you can find a foil that gives you lift starting at say 10knots - maybe the energy tradeoff doesn't work out at lower speeds - I'm sure it's a complex calculation. 



________________________________
From: Robert Deering <deering at ak.net>
To: PCW List <power-catamaran at lists.samurai.com>
Cc: Tim Chrisp <tchrisp at cedenco.co.nz>
Sent: Sun, November 15, 2009 8:37:05 PM
Subject: Re: [PCW] Fin stabilizers on cats

On 11/15/09 4:46 PM, "Georgs Kolesnikovs" <gxk at earthlink.net> wrote:

> I am not sure if your forum is still operating bit I am keen to hear if
> anyone has experience with passive fins set between the hulls of a
> displacement catamaran for slow or modest speed stabilisation.