Page 1 of 2 12 LastLast
Results 1 to 35 of 36

Thread: Hatch that Doesn't Need to be Opened Often

  1. #1
    Join Date
    Oct 2009
    Location
    Lexington, SC
    Posts
    4,898

    Default Hatch that Doesn't Need to be Opened Often

    I'd really like an access hatch on my cockpit floor. The area under the cockpit is pretty inaccessible unless the engine is first pulled up. I have put my house battery there and would also like to be able to look under there occasionally. So, it doesn't need to be accessed a lot. Would be nice if it were big enough to remove the battery when needed.

    I've seen an actual hatch that I could put teak on top to match the teak on the cockpit floor. That's nice. Looks like it has a water channel that would need a drain.




    http://www.nauticexpo.com/prod/newth...03-398711.html



    I was thinking I could just make a removable section of the cockpit floor and dog it down with bronze bolts that have nuts imbedded below. I am thinking, however, it would be impossible to prevent leakage around the edges and dirt accumulation.
    Chuck Thompson

  2. #2
    Join Date
    Apr 2010
    Location
    South Australia and Tasmania
    Posts
    9,588

    Default Re: Hatch that Doesn't Need to be Opened Often

    I think you are right.

  3. #3
    Join Date
    Apr 1999
    Location
    Hyannis, MA, USA
    Posts
    40,677

    Default Re: Hatch that Doesn't Need to be Opened Often

    If you're going to make it yourself it's a lot easier to make it bigger to allow for a working gutter all the way around. I like a gutter 1-1/2" or more wide so that it can be easily cleaned. This means an extra 3" length and width to make the same size working access. Then proper drains and dogs so you have a hatch that's total lift-away.

  4. #4
    Join Date
    Jan 2010
    Location
    Sweden,Scilly Isles, Siberia
    Posts
    7,127

    Default Re: Hatch that Doesn't Need to be Opened Often

    That hatch in the picture looks awfull in my eyes. I had a whole cockpit floor hatch, maybe 2in all around before the hatch lip moulding, about 3 in high, with the hatch top sitting on that, with rubber gaskets on both surfaces. Do not recall any leaks worth mentioning, did have big cockpit drains though. Used as storage for 5 20l water containers, used a grating above the hatch to force it down on its gaskets.
    Awkward access like that is a real pain, and do not forget proper ventilation if the battery has charge going into it.

  5. #5
    Join Date
    Mar 2007
    Location
    East Quogue,NY
    Posts
    11,976

    Default Hatch that Doesn't Need to be Opened Often

    You could make a removable cockpit section- what FRP boatbuilders call a, "soft patch,"--by landing the hatch on a perimeter " shelf" on to which a gasket is applied and through which the screws run. Then, the caulking of your choice over top. It's pretty common for fuel tanks in glass powerboats to have this kind of access. The technique is well- proven.

    Kevin


    Sent from my iPhone using Tapatalk Pro
    There are two kinds of boaters: those who have run aground, and those who lie about it.

  6. #6
    Join Date
    Oct 2009
    Location
    Lexington, SC
    Posts
    4,898

    Default Re: Hatch that Doesn't Need to be Opened Often

    Quote Originally Posted by Breakaway View Post
    You could make a removable cockpit section- what FRP boatbuilders call a, "soft patch,"--by landing the hatch on a perimeter " shelf" on to which a gasket is applied and through which the screws run. Then, the caulking of your choice over top. It's pretty common for fuel tanks in glass powerboats to have this kind of access. The technique is well- proven.

    Kevin


    Sent from my iPhone using Tapatalk Pro
    I'll think on this. Might be the best idea. Just recaulk any time I have to remove it--which might be just once a year, or even less frequent.

    I would not do the teak the same as in the pic above if I used such a hatch--too busy. You can arrange the teak any way you like.
    Chuck Thompson

  7. #7
    Join Date
    Apr 2005
    Location
    Hills of Vermont, USA
    Posts
    18,341

    Default Re: Hatch that Doesn't Need to be Opened Often

    Quote Originally Posted by chuckt View Post
    I'll think on this. Might be the best idea. Just recaulk any time I have to remove it--which might be just once a year, or even less frequent.

    I would not do the teak the same as in the pic above if I used such a hatch--too busy. You can arrange the teak any way you like.
    Seems to me that if you use a good gasket there should be no need for caulk. I added ~6x10" inspection ports to my aluminum fuel tanks & they've never leaked.

    Use Dzus fasteners close enough together & it should be fine:

    "If it ain't broke, you're not trying." - Red Green

  8. #8
    Join Date
    May 2004
    Location
    Cuyahoga Falls, Ohio
    Posts
    2,937

    Default Re: Hatch that Doesn't Need to be Opened Often

    Dzus fasteners are really handy, quick to un-do if need be, and are spring loaded. Finestkind.

  9. #9
    Join Date
    Nov 2016
    Location
    Everett, WA, USA
    Posts
    315

    Default Re: Hatch that Doesn't Need to be Opened Often

    Is it too late in your construction for a removable sole - like this?



    Gutters all around into a drain trough that has the scuppers.





    Travis.

  10. #10
    Join Date
    Jan 2003
    Location
    New Zealand's Far North
    Posts
    7,052

    Default Re: Hatch that Doesn't Need to be Opened Often

    When I had my tri it had a flush foredeck hatch that didnt leak. Like Ian said in post #3, it had a wide gutter all around and a decent overboard drain.
    There is nothing quite as permanent as a good temporary repair.

  11. #11
    Join Date
    Oct 2009
    Location
    Lexington, SC
    Posts
    4,898

    Default Re: Hatch that Doesn't Need to be Opened Often

    Nice work there Zuri.

    I'm not sure I want such a big gutter/crud-accumulater.

    I've seen one Concordia with a really big bronze access port. Maybe 14-16" I haven't seen any bronze ones for sale like that. Hamilton sells an 8' port which would be big enough for viewing purposes but obviously not big enough to get stuff in and out.
    Chuck Thompson

  12. #12
    Join Date
    Mar 2007
    Location
    East Quogue,NY
    Posts
    11,976

    Default Re: Hatch that Doesn't Need to be Opened Often

    I've seen one Concordia with a really big bronze access port. Maybe 14-16" I haven't seen any bronze ones for sale like tha
    Chuck, most of the ones I have seen are actually made from aluminum or galvanized steel, though there may well be bronze ones. Like these.

    http://www.fisheriessupply.com/freem...iftout-hatches


    Kevin
    There are two kinds of boaters: those who have run aground, and those who lie about it.

  13. #13
    Join Date
    Oct 2009
    Location
    Lexington, SC
    Posts
    4,898

    Default Re: Hatch that Doesn't Need to be Opened Often

    Yeah Kevin--I've seen those. Haven't found one in bronze though.
    Chuck Thompson

  14. #14
    Join Date
    Apr 1999
    Location
    Hyannis, MA, USA
    Posts
    40,677

    Default Re: Hatch that Doesn't Need to be Opened Often

    Bronze gets way way hot under the noonday sun. Go with aluminum if anything.

  15. #15
    Join Date
    Jul 2011
    Location
    Lindstrom, MN
    Posts
    1,501

    Default Re: Hatch that Doesn't Need to be Opened Often

    Quote Originally Posted by chuckt View Post
    I'll think on this. Might be the best idea. Just recaulk any time I have to remove it--which might be just once a year, or even less frequent..
    DAP makes a strippable caulk. Peel 'N Seal in the US and Draft Attack in Canada. It might work well in say a 1/4" wide and deep groove around the hatch, but not as a gasket between flat surfaces. I used it on a rusted sunroof (more of a rain roof) many years ago. It held up for about a year near Boston on a 70 mile/ 70 mph round trip commute. It peeled easily when I removed it. Some reviews say it works, others had problems. The Home Depot reviews indicate that it does not peel if you use it in a deep narrow crack between two surfaces. http://www.dap.com/dap-products-ph/s...strip-sealant/
    Management is the art of counting beans. Leadership is the art of making every being count. --Joe Finch

  16. #16
    Join Date
    Feb 2015
    Location
    Cheltenham, Gloucestershire, UK
    Posts
    89

    Default Re: Hatch that Doesn't Need to be Opened Often

    Do batteries really need ventilation? I have exactly the same issue as Chuckt and was going to use Breakaway's solution. But if I need to ventilate the batteries I'll need to incorporate that somewhere else in the cockpit sole.

  17. #17
    Join Date
    Apr 2005
    Location
    Hills of Vermont, USA
    Posts
    18,341

    Default Re: Hatch that Doesn't Need to be Opened Often

    Quote Originally Posted by kakistoc View Post
    Do batteries really need ventilation? I have exactly the same issue as Chuckt and was going to use Breakaway's solution. But if I need to ventilate the batteries I'll need to incorporate that somewhere else in the cockpit sole.
    If conventional lead-acid batteries then a loud YES!!!!. They give off Hydrogen & Hydrogen Sulfide & both are extremely flammable. In an enclosed space they can easily be explosive.
    "If it ain't broke, you're not trying." - Red Green

  18. #18
    Join Date
    Feb 2015
    Location
    Cheltenham, Gloucestershire, UK
    Posts
    89

    Default Re: Hatch that Doesn't Need to be Opened Often

    Thanks
    Reading on it, it looks like AGM batteries will be ok with just a small amount of ventilation?

  19. #19
    Join Date
    Apr 2005
    Location
    Hills of Vermont, USA
    Posts
    18,341

    Default Re: Hatch that Doesn't Need to be Opened Often

    Quote Originally Posted by kakistoc View Post
    Thanks
    Reading on it, it looks like AGM batteries will be ok with just a small amount of ventilation?
    Smaller than conventional wet batteries, yes. However - how lucky are you feeling?
    "If it ain't broke, you're not trying." - Red Green

  20. #20
    Join Date
    Feb 2015
    Location
    Cheltenham, Gloucestershire, UK
    Posts
    89

    Default Re: Hatch that Doesn't Need to be Opened Often

    it is a balance between enough ventilation for the batteries and a big hole in the cockpit floor to let stray waves in. I'm thinking maybe a couple of 1 1/2" pipes sticking up from the cockpit by a foot or so, and sheltered under the decking.

  21. #21
    Join Date
    Oct 2009
    Location
    Lexington, SC
    Posts
    4,898

    Default Re: Hatch that Doesn't Need to be Opened Often

    I don't know if Gels do either, however, in my case, the area is well-ventilated. In fact, Ray Hunt seemed to make sure that there is no spot in the Concordia that doesn't get some airflow
    Chuck Thompson

  22. #22
    Join Date
    Mar 2017
    Location
    Deltaville, VA
    Posts
    55

    Default Re: Hatch that Doesn't Need to be Opened Often

    Quote Originally Posted by Garret View Post
    If conventional lead-acid batteries then a loud YES!!!!. They give off Hydrogen & Hydrogen Sulfide & both are extremely flammable. In an enclosed space they can easily be explosive.
    Garret, any idea whether this gas rises or falls? Hopefully it doesn't fall like leaky propane.

  23. #23
    Join Date
    Apr 2005
    Location
    Hills of Vermont, USA
    Posts
    18,341

    Default Re: Hatch that Doesn't Need to be Opened Often

    Quote Originally Posted by Train View Post
    Garret, any idea whether this gas rises or falls? Hopefully it doesn't fall like leaky propane.
    Hydrogen will definitely rise - as it's the lightest element. Hydrogen Sulfide IS heavier than air (I must admit that google was my friend on this one).
    "If it ain't broke, you're not trying." - Red Green

  24. #24
    Join Date
    Feb 2006
    Location
    NZ
    Posts
    1,981

    Default Re: Hatch that Doesn't Need to be Opened Often

    Chuck, avoid cockpit hatches if at all possible. None of them are great solutions as all hatches bring their own set of problems that may be bigger than the one you want to solve. I would look at moving the batteries before building a hatch and if you decide a hatch is the way to go then I would consider a flush one that is screwed down with machine screws and has a flush gasket around the perimeter to stop crud getting in. I would glass all mating surfaces as well to avoid rot.
    whatever rocks your boat

  25. #25
    Join Date
    Oct 2000
    Location
    Padanaram, MA USA
    Posts
    9,106

    Default Re: Hatch that Doesn't Need to be Opened Often

    I am not an authority, but I think that lead-acid batteries only give off hydrogen if severely overcharged.
    I have never smelled HS near my batteries. Ask a surveyor.

    I have used the peelable sealant and it works as you'd want .

  26. #26
    Join Date
    Apr 2005
    Location
    Hills of Vermont, USA
    Posts
    18,341

    Default Re: Hatch that Doesn't Need to be Opened Often

    Quote Originally Posted by JimConlin View Post
    I am not an authority, but I think that lead-acid batteries only give off hydrogen if severely overcharged.
    I have never smelled HS near my batteries. Ask a surveyor.

    I have used the peelable sealant and it works as you'd want .
    Hydrogen when charging normally, Hydrogen Sulfide if overcharging.

    I have seen a battery explode when a mechanic leaned over it with a cig. in his mouth while it was charging normally.
    "If it ain't broke, you're not trying." - Red Green

  27. #27
    Join Date
    Feb 2015
    Location
    Cheltenham, Gloucestershire, UK
    Posts
    89

    Default Re: Hatch that Doesn't Need to be Opened Often

    Paul G,
    How do you see the flush gasket working? Is this beneath a flange on the top of the hatch? Or how?

  28. #28
    Join Date
    Jul 2011
    Location
    Lindstrom, MN
    Posts
    1,501

    Default Re: Hatch that Doesn't Need to be Opened Often

    Management is the art of counting beans. Leadership is the art of making every being count. --Joe Finch

  29. #29
    Join Date
    Sep 2002
    Location
    Penngrove, CA
    Posts
    1,142

    Default Re: Hatch that Doesn't Need to be Opened Often

    Whatever your solution, keep in mind the weight of the water when the cockpit (I cubic meter is 2200lbs.. most cockpits will hold that volume) is filled before the drains can empty it (assuming you have cockpit drains). Any flange you build to support a home-made hatch will have to hold the volume of water the cockpit defines without splintering and caving in should you take just the right wave over the stern.

  30. #30
    Join Date
    Feb 2004
    Location
    Texas
    Posts
    8,165

    Default

    Quote Originally Posted by BrianM View Post
    Whatever your solution, keep in mind the weight of the water when the cockpit (I cubic meter is 2200lbs.. most cockpits will hold that volume) is filled before the drains can empty it (assuming you have cockpit drains). Any flange you build to support a home-made hatch will have to hold the volume of water the cockpit defines without splintering and caving in should you take just the right wave over the stern.


    Not quite accurate. Unless the hatch is a square meter in area and the cockpit is a meter deep.

  31. #31
    Join Date
    Sep 2002
    Location
    Penngrove, CA
    Posts
    1,142

    Default Re: Hatch that Doesn't Need to be Opened Often

    Quote Originally Posted by peb View Post
    Not quite accurate. Unless the hatch is a square meter in area and the cockpit is a meter deep.
    Hi, I'm referring to sailboats and cockpits with legroom to accommodate 4 people or more which is not uncommon. The enclosed volume will hold a very heavy mass of water. A crashing wave will amplify the weight borne by any flange attached to the underside of a cockpit sole to hold up a hatch. The point was to be cautious and build STOUTLY.

  32. #32
    Join Date
    Feb 2006
    Location
    NZ
    Posts
    1,981

    Default Re: Hatch that Doesn't Need to be Opened Often

    Quote Originally Posted by kakistoc View Post
    Paul G,
    How do you see the flush gasket working? Is this beneath a flange on the top of the hatch? Or how?
    You can have a tapered hatch edge with a soft rubber seal on the perimeter, I just dont like cockpit floor hatches. Ideally the solution is to have gutters that can drain whatever comes through the hatch joints but when your heeling and there is a buckets of water or even waves coming in, they inevitably become overwhelmed and leak. The other problem is that the hinges, handles, raised portions etc become tripping points in smaller cockpits as usually you cannot avoid them, and some designs raise the height of the sole which may seem a small deal but even minor changes in dimensions can alter the comfort and safety of a cockpit.
    whatever rocks your boat

  33. #33
    Join Date
    Feb 2006
    Location
    NZ
    Posts
    1,981

    Default Re: Hatch that Doesn't Need to be Opened Often

    Quote Originally Posted by Zuri View Post
    Is it too late in your construction for a removable sole - like this?



    Gutters all around into a drain trough that has the scuppers.





    Travis.
    This cockpit unfortunately needs a hatch, but from what i can see it isn't dogged down and if that is the case then it is vulnerable to flooding. From the size of boat its probably never going offshore so no problem but the guttering will be a crud trap. You will be surprised at what gets in there and it will be a regular cleaning job.
    whatever rocks your boat

  34. #34
    Join Date
    Jul 2011
    Location
    Lindstrom, MN
    Posts
    1,501

    Default Re: Hatch that Doesn't Need to be Opened Often

    Quote Originally Posted by Paul G. View Post
    This cockpit unfortunately needs a hatch, but from what i can see it isn't dogged down and if that is the case then it is vulnerable to flooding. From the size of boat its probably never going offshore so no problem but the guttering will be a crud trap. You will be surprised at what gets in there and it will be a regular cleaning job.
    There is another thread on hatch latches more or less. A flush latch might be the solution.
    Zuri's first picture shows a scupper near the seal. (Posts #9 and 33) That takes care of the crud and water, obviating any need for the peelable caulk that some jerk suggested in Post #15.
    Quote Originally Posted by MN Dave View Post
    Management is the art of counting beans. Leadership is the art of making every being count. --Joe Finch

  35. #35
    Join Date
    Feb 2004
    Location
    Texas
    Posts
    8,165

    Default

    Quote Originally Posted by Paul G. View Post
    This cockpit unfortunately needs a hatch, but from what i can see it isn't dogged down and if that is the case then it is vulnerable to flooding. From the size of boat its probably never going offshore so no problem but the guttering will be a crud trap. You will be surprised at what gets in there and it will be a regular cleaning job.


    Boat's still in the shop, I would assume latches are planned.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •