Re: [PCW] Fw: wet or dry
From: "Bert/Noelle Harrott" harrott@cox.net
Subject: [PCW] Fw: wet or dry
We would like to invite informed comment on the hydro-dynamic differences of
apparently similar boats. We have been very interested in the Lagoon Powercat
43. With the release of the new 44 our interest has been heightend. A point of
concern has been the apparent "wetness" of this boat when underway. Every
observation points to excessive spray streaming from the bows, outboard and
between the hulls. By comparison, the Cumberland 44 is virtually "dry". Can
anyone shed light on this issue and/or speak from experience
Noelle& Bert
Brian ask?
Did you get any of these impressions from previous discussions on this forum?
Did you look back thru the fairly young archives of this list to find any
discussions? For instance;
Date: Wed, 16 Mar 2005 08:28:05 AM EST
From: yumyum1@earthlink.net
To: "Power Catamaran List" power-catamaran@lists.samurai.com
Subject: [PCW] Sneezing? RE: Back on boat... Our experience with Lagoon 43
Let me try.
When a catamaran is in motion and when a wave of any type enters between the
sponsons the wave typically becomes trapped, broken up into smaller water
particles and the new air/water particle mixture becomes compressed as it
travels toward and egresses the aft end. The mixture accounts for the very
comfortable ride a catamaran displays in rougher seas since the mixture and
hulls act together like a giant shock absorber. However, depending upon hull
design, sea state and speed of the vessel, this air/water particle mixture can
develope a counter pressure high enough so part of the mixture may not egress
aft. A part of the air/water mixture can be pushed forward and escapes by
coming over the bow. Hence the so called "sneezing" phenomenon.
The size of a sneeze can be anything from a light mist to a heavy raindrop
downpour and often is a combination of both.
The Lagoon 43 sneezed a lot on that particular trial day. In the 18 months we
have been aboard our Aventure 460 and having cruised over 7800 miles, we have
"sneezed" only one single time! One single sneeze! The sneeze had the audacity
to came up to our flybridge. Our hardtop flybridge is enclosed on three sides
with 7 and 9 mm CE certified safety glass and no one got wet. This was in a
head sea with about 5' waves
Brian Eiland
beiland@usa.net
www.RunningTideYachts.com
distinctive expedition yachts