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Old 03-09-2015, 03:42   #31
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Re: New deck hatches, how large?

BS EN ISO 9094-2
Small craft Fire protection

4.3 Exits

Any exit from an accommodation space or from any other space shall have the following minimum clear openings:

- circular shape: diameter 450 mm;

- any other shape: minimum dimension of 380 mm and minimum area 0,18 m2. The exit shall be large enough to allow for a 380 mm diameter circle to be inscribed.
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Old 03-09-2015, 03:53   #32
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Re: New deck hatches, how large?

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Cool, I love mad ideas.

My current mad idea is to have a two position hinge for the aft edge that will allow the hatch to be opened as a sort of mushroom vent, giving airflow while in the pen, without rainwater getting in. Making that work is gonna use up some welding wire.


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Maybe a slotted hinge, so it can be lifted slightly, and also snugged down on its rubber gasket.

Another thought, with three hatches, consider where there going to lock down from. Ideally they can be opened from inside and out, but it's awkward to make watertight dogs like this. Easier to have some of the hatches open from inside, and some from outside, so if you get locked outside at sea you can get back inside...

My folks main skylights don't even have hinges, they can be propped open from any angle. Or removed entirely. Handy when tied up on hit days with a light beam wind.

Another consideration is where the hatch will stow when open.

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Old 03-09-2015, 04:47   #33
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Re: New deck hatches, how large?

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Originally Posted by GordMay View Post
BS EN ISO 9094-2
Small craft Fire protection

4.3 Exits

Any exit from an accommodation space or from any other space shall have the following minimum clear openings:

- circular shape: diameter 450 mm;

- any other shape: minimum dimension of 380 mm and minimum area 0,18 m2. The exit shall be large enough to allow for a 380 mm diameter circle to be inscribed.

Thank you GordMay. Sadly I fear I may have exceeded some of those dimensions. Time to get back on the bicycle.


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Old 03-09-2015, 11:55   #34
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Re: New deck hatches, how large?

450 MM ? Only skinny supermodels can exit a sinking ship? Who's idea was this? The guys that come to rescue everyone?

Women and children first. Real men go down with the ship!!! Universal Titanic rules. Been in place since 1912. I should have known!
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Old 03-09-2015, 18:08   #35
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Re: New deck hatches, how large?

Couple more thoughts. Big hatch =heavy. Maybe gas struts to help open it? Also issues with the perspex expansion. Maybe better to split the perspex up into 4 smaller pieces with beams between them to reinforce the hatch. Probably lighter and cheaper this way, but more work sealing and building the hatch.

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Old 03-09-2015, 18:23   #36
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Re: New deck hatches, how large?

These fit over the various types of hatches on KAREN. Scoops are aluminum and fit over the wood bases scribed to the cabin top and have aluminum right angles that the cowling (?)slides onto and seals. Scoops can be lifted off and rotate 90 or 180 degrees. Aluminum frame sandwiches insect seen that can be easily replaced. Airflow is huge as is the potential for seawater if facing in wrong direction. The on the fwd. Hatch came out six in. too high and will get cut down one day.
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Old 03-09-2015, 18:25   #37
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Re: New deck hatches, how large?

Friggin' photos didn't go through. I'll try again.
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Old 03-09-2015, 18:25   #38
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Re: New deck hatches, how large?

I don't see much advantage in make them bigger. possibly disadvantage if you are using plastic see thru material on top. I think o f it this way:
a) is it an opening I need to get my body thru? or anything big?
b) How do I feel about the size/water entrance if it fails?
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Old 03-09-2015, 18:29   #39
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Re: New deck hatches, how large?

I give up
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Old 03-09-2015, 18:38   #40
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Re: New deck hatches, how large?

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Couple more thoughts. Big hatch =heavy. Maybe gas struts to help open it? Also issues with the perspex expansion. Maybe better to split the perspex up into 4 smaller pieces with beams between them to reinforce the hatch. Probably lighter and cheaper this way, but more work sealing and building the hatch.

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My Hatch is not so heavy for adults, but my young daughter needed some assistance so I rigged up bungee cords to help her. Works good. When she grows up, I will probably remove the cords because when the hatch is closed and NOT dogged, a pitching bow will cause the hatch to become airborne followed by a pronounced clunk when it falls back down. Gas struts would be better than this solution for many reasons except cost and repairability.

Steve

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Old 03-09-2015, 23:08   #41
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Re: New deck hatches, how large?

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Old 06-09-2015, 14:12   #42
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Re: New deck hatches, how large?

If you go to my profile, you'll see pictures of KAREN'S aluminum cowlings.
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Old 06-09-2015, 16:21   #43
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Re: New deck hatches, how large?

I found the ship's cat. He's superb. But no sign of the cowlings. Which picture?


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Old 06-09-2015, 18:35   #44
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Re: New deck hatches, how large?

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And... er.. we are talking about the little wall that surrounds the hatch when it is closed? Or something else?

Matt
Yes, Matt.

We've been underway this morning, just now got to the computer, while Jim is getting out the hookah.

In our case, the dam is the height of the hatch, and has 4 drainholes per each, about 5 cm from the corners.

We rarely dog the hatches, except at sea, the one over the V berth.

Saw the pic of the dorade on the S-42. It will let more air in if the cowl is aimed towards the direction from which the wind is blowing.

Ann

PS I'll be back later, stuff to do now.

A.
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Old 06-09-2015, 18:53   #45
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Re: New deck hatches, how large?

Gilow,the next to last one. If you expand it,you can see two or three of them. They're like polar bears, you can't make them out against the snow.
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