[PCW] Nose-diving

[Noelle Harrott]

I can't believe that there has been no resopnse to my inquiry about the 
wave-piercer at the AC finals. This boat's spray-free seakindlyness was 
startling. As all the other boats around were pounding and spraying, only 
she maintained her composure.
Maybe Mr. Tennant could make a call in Auckland to someone who followed the 
NZ team and is informed about such things.
                                  Regards, Bert Harrott
----- 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 1:14 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
> _______________________________________________
> Power-Catamaran Mailing List
>
>
> -- 
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.476 / Virus Database: 269.10.4/896 - Release Date: 7/11/2007 
> 4:09 PM