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post #21 of 32 Old 05-02-2008
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The ORC states
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3.08.1 No hatch forward of the maximum beam station shall open in such a way that the
lid or cover moves into the open position towards the interior of the hull
(excepting ports having an area of less than 0.071m2 (110 sq in)).
3.08.2 A hatch shall be:
a) so arranged as to be above the water when the hull is heeled 90 degrees
b) permanently attached
c) capable of being firmly shut immediately
But I seem to recall that Australian and New Zealand certification requires that hatch hinges be forward so that taking on green water would tend to shut the hatch and thereby take on less water.


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post #22 of 32 Old 05-02-2008
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For optimum at-anchor ventilation, I'd leave it as it is shown in your picture.

Ron

1984 Fast/Nicholson 345 "FastForward"

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post #23 of 32 Old 05-02-2008
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Quote:
Originally Posted by witzgall View Post
The question was, with the hinges forward, hatch open 90 degrees and the companionway open (under a dodger) would the airflow at ANCHOR (again, not sailing, for you speed readers) be better, then having the opening of the hatch facing forward.
My answer would be No, absolutly not. With the hinge forward as mine are when the hatch is vertical it is Blocking the wind at anchor. With the hinge aft and the hatch open the hatch itself is acting as a Wind Scoop. Both situations are assuming the normal anchoring with the wind on your bow.

Stan
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post #24 of 32 Old 05-02-2008
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Quote:
Originally Posted by Faster View Post
We have two hatches forward of the mast, the lower foredeck hatch has hinges fwd, the one in the cabin top has hinges aft and acts as a ventilation scoop.
I have the same set-up: The forepeak hatch (the forepeak is isolated forward of a collision bulkhead) has the hinge forward, but has a small opening flush port set into its steel plate so you can close it but still get ventilation.

The cabin top hatches are about 18 feet back from the bow, are 19 x 19" A&Hs on four inch teak surrounds and open towards the bow with the hinge at the aft for the same reasons.

I would think the logic of one over the other would be dictated by the "offshore factor" of the boat's intended use, and the design of the foredeck regarding camber of the deck, height of the cabin house, and height of the cabin hatches, wave breakers, etc. above the cabin top.

I know that close-hauled in ten foot seas, my foredeck barely got damp, whereas we caught a fair bit of spray blown aft on to the higher, more exposed aft deck. I also noticed not a lot of spray on the pilothouse forward windows. Off the wind, we got spray only. Running, it was pretty dry. Your results might vary.

On a C&C design, by contrast, the "spoon bow" with the flush forward V-berth hatch stayed dry, but we got green water sweeps aft close-hauled in 35 knots. The seas would board at the low point in the sheer and just fly back into the cockpit on the low side. But the foredeck was merely wet, not inundated.
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post #25 of 32 Old 05-02-2008
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Quote:
Originally Posted by witzgall View Post
The question was, with the hinges forward, hatch open 90 degrees and the companionway open (under a dodger) would the airflow at ANCHOR (again, not sailing, for you speed readers) be better, then having the opening of the hatch facing forward.



Chris
The answer is no.

The type of hatch is irrelevant. Boats point into the wind when anchored, unless there is an opposing current stronger than the wind. You will get more ventilation with the hinges as shown, in the rear, hatch facing forward when open.

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post #26 of 32 Old 05-02-2008 Thread Starter
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Thanks all for your input. I wwil install the new hatches in the same orientation.

I wonder if the specific design, and or length (50-85ft) of Dashew's boats made a difference.

Chris

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post #27 of 32 Old 05-02-2008
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Witzgall - the forward hatch in the picture is going to break or develop a severe leak quickly. One day it will be partially open to catch the wind, then a gust will flip it back open. It will land (with extreme force) on the other hatch with it's left corner and bend/crack. Perhaps not the first time, but it will happen.


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post #28 of 32 Old 05-02-2008 Thread Starter
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Never thought of that. Otehr than moving the hatch for the head, any ideas on how to keep this from happening?

The hatch does has a leak now, not bad mind you, and the boat/hatches are over 20 years old.

Maybe this is a good reason to put the hatch in reverse? But then, there will be nothing to support it in your scenario, and it could put extreme stress on the hinges.


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Originally Posted by Zanshin View Post
Witzgall - the forward hatch in the picture is going to break or develop a severe leak quickly. One day it will be partially open to catch the wind, then a gust will flip it back open. It will land (with extreme force) on the other hatch with it's left corner and bend/crack. Perhaps not the first time, but it will happen.

Alchemy
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post #29 of 32 Old 05-02-2008
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I have a deep dent in my fiberglass from my forward hatch flying open (even though it has a big steel spring preventer), which is why I noticed it in the picture. I have a similar ventilator to the one in the picture, and that is what is hitting first. I think I will put some sort of a rubberized door stopper on the cabin top, in your case it would have to be mounted pretty high so that the hatch would clear the other hatch. As you noted, putting the hatch the other way may do even more potential damage, although the chances of a gust coming from that side are lower, at least while at anchor.


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post #30 of 32 Old 05-02-2008 Thread Starter
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Now that I think about it some more, I think that you are looking at an optical illusion - I don't think the forward hatch will hit the smaller one. THe lens I used to shoot this is VERY wide, and can introduce distortion and perspective issues easily. At least that is what I am hoping.

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