[Public-list] aft deck vent location

[Roger L Kingsland]

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
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