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Thread: What's the advantage of a butterfly hatch...

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  1. #1
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    Default What's the advantage of a butterfly hatch...

    With butterfly hinges or otherwise...



    over a simple flat hatch hinged on one edge only?...

    Last edited by Gib Etheridge; 03-07-2018 at 09:18 PM.

  2. #2
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    Default Re: What's the advantage of a butterfly hatch...

    It opens from two sides doubling the odds that the wind will be blown down into the boat. Looks great. If it's square, you can rotate it so the hatch opens to windward. Provides some shelter from the rain if it's falling straight down. Did I mention it looks great?
    They do have a habit of leaking if not built and maintained well though. They're tricky to build and they don't necessarily fit well on all types of boat. A 32 foot Bayliner would look odd with one on deck.
    If one advances confidently in the direction of his dreams, and endeavors to live the life which he has imagined, he will meet with a success unexpected in common hours.
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  3. #3
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    Default Re: What's the advantage of a butterfly hatch...

    They can look really salty, but so can the other.

    I'd never considered rotating a deck hatch to take advantage of the prevailing wind, but the flat hatch could do the same with this type of hinge (paumelle, bullet)...



    I suppose that folks would be less likely to step on a butterfly hatch.

  4. #4

    Default Re: What's the advantage of a butterfly hatch...

    this hinge is weak
    Boat Designer. Boatbuilder

  5. #5

    Default Re: What's the advantage of a butterfly hatch...

    Quote Originally Posted by Gib Etheridge View Post
    They can look really salty, but so can the other.

    I'd never considered rotating a deck hatch to take advantage of the prevailing wind, but the flat hatch could do the same with this type of hinge (paumelle, bullet)...



    I suppose that folks would be less likely to step on a butterfly hatch.
    this hinge is weak
    Boat Designer. Boatbuilder

  6. #6
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    Default Re: What's the advantage of a butterfly hatch...

    Nice work Gib.
    The one you are showing is a very versatile hatch in terms of ventilation and escape. The hatch as shown is also stronger and less likely to have someone stand on it.

  7. #7
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    Default Re: What's the advantage of a butterfly hatch...

    Quote Originally Posted by navydog View Post
    Nice work Gib.
    The one you are showing is a very versatile hatch in terms of ventilation and escape. The hatch as shown is also stronger and less likely to have someone stand on it.
    Not my work, C&P., and it's 2 separate hatches, but that's a great idea to have it open as butterfly and/or hinged on one edge. I've never seen that before. Even a flat hatch could be hinged to do that if it were constructed accordingly. You may have invented something.

  8. #8
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    Default Re: What's the advantage of a butterfly hatch...

    Butterfly hatch gives a couple more inches of what might be much needed head room.
    -Jim

    Sucker for a pretty face.
    1934 27' Blanchard Cuiser ~ Amazon, Ex. Emalu
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    Getting into trouble one board at a time.

  9. #9
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    Default Re: What's the advantage of a butterfly hatch...

    Three times the chance of leaking.
    They look great.... on boats with clipper bows and bolted on bowsprits.

  10. #10
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    Default Re: What's the advantage of a butterfly hatch...

    Quote Originally Posted by wizbang 13 View Post
    Three times the chance of leaking.
    They look great.... on boats with clipper bows and bolted on bowsprits.
    Hahaha,I was going to say good place for a shower.
    No ,you can beat them... mine was a standard butterfly but I modified it to hinge at the front as well so it did both jobs, butterfly and flat hatch as the pics. Then you have a bead around the base and a good cover that cinches up around that.

  11. #11
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    Default Re: What's the advantage of a butterfly hatch...

    They look kind of opposite of work boat... a sense of big dollar lavishness. Some people like that. Definitely grab ones attention.

  12. #12
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    Default Re: What's the advantage of a butterfly hatch...

    I had one on my Bristol Channel Cutter, right over the dining table. It let in a nice amount of light, most welcome as the cabin trunk had only bronze scuttles rather than windows. Great ventilation. It was hinged as a one-piece, a faux butterfly. Never leaked, ever.

    I didn't consider it a fancy affectation; it went well with the timeless pilot cutter design.
    --​Anson, M/V Kingfisher

    Be kind whenever possible. It is always possible. ~The Dalai Lama

  13. #13
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    Default Re: What's the advantage of a butterfly hatch...

    I wouldn't want to take green water over most of them, speaking of leaking three ways.

  14. #14
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    Default Re: What's the advantage of a butterfly hatch...

    We used a boom vang to to tear one off.
    I don't recommend that during rough weather on Georgian Bay.
    R
    Sleep with one eye open.

  15. #15
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    Default Re: What's the advantage of a butterfly hatch...

    Quote Originally Posted by Ron Williamson View Post
    We used a boom vang to to tear one off.
    I don't recommend that during rough weather on Georgian Bay.
    R
    Were you able to rip it off in one go or did you have to work at it for a while?

  16. #16
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    Default Re: What's the advantage of a butterfly hatch...

    Quote Originally Posted by Gib Etheridge View Post
    Were you able to rip it off in one go or did you have to work at it for a while?
    One shot.
    "Ready about. ...Helm down. Vang snagged on something."
    "F*ck. It's around the sky light.Head up!"
    BANG.
    "Uhhh... No rush....
    R
    Sleep with one eye open.

  17. #17
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    Default Re: What's the advantage of a butterfly hatch...

    They are the weakest link on the deck, and that says something. Mine is beautiful and teak, but it leaks considerably. I also don't trust it in big water strength-wise. I'll be replacing it with the lower profile solid hatch you show before I head offshore.

  18. #18
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    Default Re: What's the advantage of a butterfly hatch...

    Have two on the cabin house. Mainly they look nice. If you have to ask...... Might add that when the boat was new, they were equipped with bolt-on covers for offshore work.

  19. #19
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    Default Re: What's the advantage of a butterfly hatch...

    A dinghy stored up side down over a "winged skylight hatch" insures a bit more protection from the elements when the hatch is cracked open.
    Herreshoff did not approve of dovetailed corners, even though they look nice, as they were sources of leakage, in his opinion. He preferred a half lapped joint instead. When done right this form of hatch affords light below and ventilation that can be easily controlled. All in all I personally like the look of the winged hatch if it can be tastefully in corporated into the deck house design.
    Jay

  20. #20
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    Default Re: What's the advantage of a butterfly hatch...

    Quote Originally Posted by Jay Greer View Post
    A dinghy stored up side down over a "winged skylight hatch" insures a bit more protection from the elements when the hatch is cracked open....
    Now that you mention it, our hard dink was lashed down over the hatch when offshore. But the PO never had concerns going to New Zealand and back. It was really strong.
    --​Anson, M/V Kingfisher

    Be kind whenever possible. It is always possible. ~The Dalai Lama

  21. #21
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    Default Re: What's the advantage of a butterfly hatch...

    We mostly had a sabot over ours too.
    What is the boat ,Sabre... love to hear about it.

  22. #22
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    Default Re: What's the advantage of a butterfly hatch...

    Quote Originally Posted by John B View Post
    We mostly had a sabot over ours too.
    What is the boat ,Sabre... love to hear about it.
    She was a Bristol Channel Cutter, the sweetest little thing ever. There's one a few slips away from me currently and I often admire her lines and sigh...I sure miss that boat.
    --​Anson, M/V Kingfisher

    Be kind whenever possible. It is always possible. ~The Dalai Lama

  23. #23
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    Default Re: What's the advantage of a butterfly hatch...

    I sailed from Antigua to Nova Scotia on Papa a few years ago . This was John Steele’s personal boat , 65 foot schooner. This is the guy , virtually WAS Covey boats. He had one of these devil hatches. He built the whole boat!
    Before leaving Antigua , he put half a roll of duct tape on the stinking devil butterfly hatch, THEN frapped a sunbrella cover over it .
    Thank galvanized freakin Jesus it was a nice sail cuz my bunk was under it .
    Did this Hereschoff fellow ever actually pound salt at sea ? Or just yacht race around yankee bouys?

  24. #24
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    Default Re: What's the advantage of a butterfly hatch...

    Quote Originally Posted by wizbang 13 View Post
    I sailed from Antigua to Nova Scotia on Papa a few years ago . This was John Steele’s personal boat , 65 foot schooner. This is the guy , virtually WAS Covey boats. He had one of these devil hatches. He built the whole boat!
    Before leaving Antigua , he put half a roll of duct tape on the stinking devil butterfly hatch, THEN frapped a sunbrella cover over it .
    Thank galvanized freakin Jesus it was a nice sail cuz my bunk was under it .
    Did this Hereschoff fellow ever actually pound salt at sea ? Or just yacht race around yankee bouys?
    Actually your last question Sir, is a blatant insult and a red flag as to your immense amount of ignorance concerning yachts their design and general nautical knowledge! I am convinced that you owe us all an apology as to your insulting reference to NG Herreshoff. I will openly state that a winged skylight needs to be properly designed and that I have yet to see very many modern ones that fit into that category.
    Jay
    Last edited by Jay Greer; 03-11-2018 at 02:52 PM.

  25. #25
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    Default Re: What's the advantage of a butterfly hatch...

    I just don't understand the objections. How else can one entice the butterflies down below?
    -Dave

  26. #26
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    Default Re: What's the advantage of a butterfly hatch...

    Quote Originally Posted by Woxbox View Post
    I just don't understand the objections. How else can one entice the butterflies down below?
    Promises of sunsets and fine wine?

    Or Milkweed?

  27. #27
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    Default Re: What's the advantage of a butterfly hatch...

    ^ Could be all right, but one could use 3 or even 4 if it was that important. I was just speculating, I do a lot of that. Personally I like the idea of a flat, leak-free, transparent hatch hinged fore and aft or port and starboard. That should be enough.

  28. #28
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    Default Re: What's the advantage of a butterfly hatch...

    Quote Originally Posted by Gib Etheridge View Post
    ^ Could be all right, but one could use 3 or even 4 if it was that important. I was just speculating, I do a lot of that. Personally I like the idea of a flat, leak-free, transparent hatch hinged fore and aft or port and starboard. That should be enough.
    A flat leak free transparent hinge? Might as well get varnish that stays on forever, sealant that never fails, and anti fouling that repels sea life. I think you are onto something here.

  29. #29
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    Default Re: What's the advantage of a butterfly hatch...

    Transparent hatch Phil, that can open either to the port or starboard, or, fore and aft.

  30. #30
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    Default Re: What's the advantage of a butterfly hatch...

    Oh, hatch. Funny I often misread thread titles on here, frequently good for a laugh.

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