[Public-list] Centre Hatch on 1965 A30

[J Bergquist]

This is exactly how it works on my boat. The hinge on the main cabin
hatch is forward. When I am at anchor, open forward hatch and main
cabin hatch, air scoops into the forward hatch and is sucked out the
aft hatch. It does improve ventilation in the middle of the cabin
markedly. I can also use it while sailing, without getting spray down
below. It serves as a good exhaust ventilator then, too. I also use it
in the wintertime when I am using the woodstove as a means to exhaust
warm, moist cabin air and keep things dry down below.

If I had a dodger, I suspect it would not be as big a benefit, since
the dodger effectively acts as a very large cowl, but I don't have
that (yet).

I have a dorade ventilator in the head as well. It faces aft.

All of these ventilators came installed on my boat. I have no idea
whether or not they're original.

Kind regards,

JB

On 3/12/07, Gordon Laco <mainstay at csolve.net> wrote:
> Hi Roger -
>
> The amount of ventilation you get through dorades is quite minimal.  However
> a skylight hatch will blast a draft of wind down below, some people feel the
> best set up is to have the skylight hinged forward so the when open the unit
> tends to suck air out.  Combine that with the fore hatch open and scooping
> air in and you have dramatically improved circulation.
>
> The companionway tends to draw air in due to its being partly in the break
> of the cabin...
>
> Gord #426
>
>
>
>
>
>
>
> > I am trying to understand the need for an additional hatch in the main
> > cabin.  With those four "picture windows", certainly there is plenty of
> > natural light.  As for ventilation, the main hatch has to be at least 20% of
> > the area of the overhead.  I suppose a second hatch would add to cross
> > ventilation but so would a cowl vent with a dorade which could be used in
> > all but the worst weather while under weigh.  Would it be feasible to
> > install a dorade box (or two) at the aft end of the lower cabin top that
> > ventilates the main cabin?
> >
> > Roger 148
> >
>
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