[PCW] Nose-diving

[gramario]

Thank you very much for this information. I did not actually want to imply 
that power cats and sailing behaved the same. Rather I was interested to 
learn how well power cats behave in rough seas and if any testing has been 
carried out, or whether people have had experiences re. these areas. It is 
pretty logical I suppose as you only have one life, and it is best to learn 
the risks before venturing into dangerous situations. Having said that, it 
is of course wise not to venture into rough seas unless absolutely 
necessary, but if you do find yourself in them, ....

Regards,
Rup.

----- Original Message ----- 
From: "Malcolm Tennant" <malcolm at tennantdesign.co.nz>
To: "Power Catamaran List" <power-catamaran at lists.samurai.com>
Sent: Wednesday, July 11, 2007 4:14 PM
Subject: Re: [PCW] Nose-diving


> The major difference between a sailing catamaran and a power catamaran is 
> the
> presence of a rig on the sailing vessel. The centre of effort of the rig 
> will
> be quite a long way above the deck and the centre of lateral plane will be
> below the surface of the water. This difference in position produces a 
> large
> turning moment. In some conditions this is trying to capsize the boat. In
> others it is trying to drive the leeward bow down. So remove the rig and
> essentially both of those conditions disappear. Without the rig the forces
> trying to capsize the power cat or drive its bows under are considerably 
> less
> than those operating on a sailing cat. However it continually surprises me
> that so many people expect the sailing cat and the power cat to behave the
> same. How many times have I heard the "catamarans capsize" comment applied 
> to
> power catamarans in the last 30 years!
>
> Regards,
>
> Malcolm Tennant.  ARINA  MA
>
>
> MALCOLM TENNANT MULTIHULL DESIGN LTD
> PO Box 60513, Titirangi.
> Waitakere 0642
> NEW ZEALAND
> Ph: +64 9 817 1988
> e-mail: malcolm at tennantdesign.co.nz
> www.tennantdesign.co.nz
> www.catdesigners.com
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