Jere Lull wrote:
Jim Woodward wrote:


Your dinghy may not do it, but it is possible to fool the water -- the
Kiwis tried it in the last America's Cup

As I recall, that attempt didn't work particularly well....

But our little boat with a wide flattish transom considers hull speed
(1.34 x sqrt(LWL)) a suggestion rather than the law. It seems the AC
boats and other newer sleds are more advanced that way.


Two points he

1. Hull speed only relates to displacement hulls. Planing hulls such as
the aforementioned sleds are another story.

2. The jury is still out on the hula skirt as used on Black Magic in the
most recent America's Cup finals. Remember it was other problems such
as taking on excessive water, having the jib pull out of its track and
losing a mast because of standing rigging failure that lost the races.
When the boat was able to sail it was plenty fast. The hula was always
a tradeoff of LWL versus increased drag caused by the rule-mandated gap
between the skirt and the hull proper. I'm sure that it will be
outlawed in the next go around.

Joe Wood

On Wed, 15 Oct 2003 23:17:29 -0400, Joe Wood
wrote:



Jere Lull wrote:
Jim Woodward wrote:


Your dinghy may not do it, but it is possible to fool the water -- the
Kiwis tried it in the last America's Cup

As I recall, that attempt didn't work particularly well....

But our little boat with a wide flattish transom considers hull speed
(1.34 x sqrt(LWL)) a suggestion rather than the law. It seems the AC
boats and other newer sleds are more advanced that way.


Two points he

1. Hull speed only relates to displacement hulls. Planing hulls such as
the aforementioned sleds are another story.

It also only applies to displacement hulls with a L/W of less than
around 3 or 4. When you get to the 8-10 range, you can easily exceed
hull speed, as catamarans (also displacement hulls) do.

Steve

The URL below points to an article about Annapolis resident Clay Oliver,
inventer of the hula skirt and designer of the mega-yacht, Mari Cha
IV, which just set an Atlantic crossing record breaking the previous
mark by 2 days. It also set the 24 hour record which was set in the
Volvo race.

http://www.hometownannapolis.com/cgi...3/10_16-18/SAL

Unfortunately the picture that was in the ODT edition is not on the web
page and I couldn't find one of MC IV on the net.

Joe Wood

Steven Shelikoff wrote:

On Wed, 15 Oct 2003 23:17:29 -0400, Joe Wood
wrote:



Jere Lull wrote:

Jim Woodward wrote:



Your dinghy may not do it, but it is possible to fool the water -- the
Kiwis tried it in the last America's Cup


As I recall, that attempt didn't work particularly well....

But our little boat with a wide flattish transom considers hull speed
(1.34 x sqrt(LWL)) a suggestion rather than the law. It seems the AC
boats and other newer sleds are more advanced that way.


Two points he

1. Hull speed only relates to displacement hulls. Planing hulls such as
the aforementioned sleds are another story.


It also only applies to displacement hulls with a L/W of less than
around 3 or 4. When you get to the 8-10 range, you can easily exceed
hull speed, as catamarans (also displacement hulls) do.

Steve

http://www.mari-cha4.com/

She averaged 19.5 knots over the 6+ days of her TranAtlantic crossing but
her theoretical hull speed is about 16. Her top 24 hour pace for 525 miles
was 21.9 knots.

I bet they were smiling.

Matt/Meribeth Pedersen wrote:

http://www.mari-cha4.com/

She averaged 19.5 knots over the 6+ days of her TranAtlantic crossing but
her theoretical hull speed is about 16. Her top 24 hour pace for 525 miles
was 21.9 knots.

I bet they were smiling.




With a hull that long and skinny, I doubt she's limited to 1.34*sqrt(LWL)

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/