[Public-list] aft deck vent location

Fri Aug 5 04:22:51 PDT 2005

Roger  -
   Do you not have the original fittings and through-decks for engine space
ventilation? Someone else can tell me if these were actually original.
   In any case they were optimally placed, I think, minimizing interference
with the mainsheet, the lazarette storage, aft docking lines, etc.
   If you don't have them I would copy another boat that has them.

   I would second the opinion that flexible vents would serve better here.

   Regarding scooping water  - look at
http://www.alberg30.org/pictures/CanAm/photo1.html, Winter's Beat well over
with her aft vent cowlings high and dry.

Mike
-----Original Message-----
From: public-list-bounces at alberg30.org
[mailto:public-list-bounces at alberg30.org]On Behalf Of Roger L Kingsland
Sent: Thursday, August 04, 2005 2:30 PM
To: Alberg30
Subject: [Public-list] aft deck vent location

A30 Somethings,

I have 2-3" SS cowl vents I plan to install on the aft deck of #148 to
ventilate everything aft of the cabin. They look to be about the size of
those on Encore (only about half again taller) visible on the cover of the
2005 A30 Directory.  Looking at other pictures of A30s, it seems the stern
pulpit (is that a pushpit) makes a good seat at anchor and the aft deck
works well as cockpit overflow space so I would like to put the vents where
they won't be in the way.  

I wonder if just aft of the main traveler might catch the main sheet on
tacks/jibes, particularly since my vents are rigid (unlike Encore's which
look to be flexible plastic).  The ideal place relative to my ventilation
plan would be outboard and aft under the side railings of the pulpit.  That
location would also keep deck space open and the pulpit might fend off loose
lines that could catch on the vents.

Only problem with this location is, when the boat is well healed (from a
tipping perspective, not medical or financial),the vent facing forward might
scoop water instead of air?  Thus the question, does anyone know, when the
deck amidships is underwater (IE, caught in a squall w/ sails still up), if
the aft, outboard corner of the deck is also under water?  I suppose, in the
conditions I describe, most crew members have more pressing concerns than
observing the relationship between the water and poop deck but, any feedback
/ opinions would be greatly appreciated.

I have also considered just aft of the lazarette hatch flanking either side
of the back stay.  This would look real shippy but I might hinder proper
operation a pulpit mounted "barbie" and would probably preclude installation
of a stern boarding ladder.  Any thoughts on this alternative?

Thanks so much,

Roger

Roger Kingsland
Managing Partner
KSBA Architects
N40°- 27.83'  W79°- 57.99'

(412) 252-1500 x101 office
(412) 779-5101 cell
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