Hatches which are real wathertight - Wharram Builders and Friends2024-03-28T19:02:38Zhttps://wharrambuilders.ning.com/forum/topics/hatches-which-are-real-wathertight?x=1&id=2195841%3ATopic%3A95315&feed=yes&xn_auth=noThe wood and string hinges on…tag:wharrambuilders.ning.com,2013-04-20:2195841:Comment:990362013-04-20T01:27:49.122ZGlenn Tiemanhttps://wharrambuilders.ning.com/profile/GlennTieman
<p>The wood and string hinges on the tama moana hinge off the deck<br></br> <br></br> <cite>Ricardo Aráoz said:</cite></p>
<blockquote cite="http://wharrambuilders.ning.com/forum/topics/hatches-which-are-real-wathertight?commentId=2195841%3AComment%3A98970&xg_source=msg_com_forum#2195841Comment98971"><div><div class="xg_user_generated"><p>Hi Glenn, looks good.</p>
<p>In the Griffith's hatches you hinge the hatch side to the outer combing, this has some advantages. How do you hinge the hatch cover…</p>
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<p>The wood and string hinges on the tama moana hinge off the deck<br/> <br/> <cite>Ricardo Aráoz said:</cite></p>
<blockquote cite="http://wharrambuilders.ning.com/forum/topics/hatches-which-are-real-wathertight?commentId=2195841%3AComment%3A98970&xg_source=msg_com_forum#2195841Comment98971"><div><div class="xg_user_generated"><p>Hi Glenn, looks good.</p>
<p>In the Griffith's hatches you hinge the hatch side to the outer combing, this has some advantages. How do you hinge the hatch cover in your design?<br/> <br/> <cite>Glenn Tieman said:</cite></p>
<blockquote cite="http://wharrambuilders.ning.com/forum/topics/hatches-which-are-real-wathertight?x=1&id=2195841%3ATopic%3A95315&page=3#2195841Comment99008"><div class="xg_user_generated"><p>Thank you Patrick. sorry it was inadequate. Here's more detail. Note that that this design has an airspace between inner and outer restrictions like double combings and the wharram type but directs water flow away from the seal as commercial hatches do, unlike the wharram type, making the seal in fact optional as Isabel noted when I was on board wakataitea. This might be roughly similar to the traditional double combings in dryness or maybe better but simpler, cheaper, and lighter and no trash trap. Hanneke also liked it because it presents a broader more comfortable surface to sit on.</p>
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</blockquote> Hi Glenn, looks good.
In the…tag:wharrambuilders.ning.com,2013-04-18:2195841:Comment:989712013-04-18T14:36:47.472ZRicardo Aráozhttps://wharrambuilders.ning.com/profile/RicardoAraoz
<p>Hi Glenn, looks good.</p>
<p>In the Griffith's hatches you hinge the hatch side to the outer combing, this has some advantages. How do you hinge the hatch cover in your design?<br></br> <br></br> <cite>Glenn Tieman said:</cite></p>
<blockquote cite="http://wharrambuilders.ning.com/forum/topics/hatches-which-are-real-wathertight?x=1&id=2195841%3ATopic%3A95315&page=3#2195841Comment99008"><div class="xg_user_generated"><p>Thank you Patrick. sorry it was inadequate. Here's more detail. Note that…</p>
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<p>Hi Glenn, looks good.</p>
<p>In the Griffith's hatches you hinge the hatch side to the outer combing, this has some advantages. How do you hinge the hatch cover in your design?<br/> <br/> <cite>Glenn Tieman said:</cite></p>
<blockquote cite="http://wharrambuilders.ning.com/forum/topics/hatches-which-are-real-wathertight?x=1&id=2195841%3ATopic%3A95315&page=3#2195841Comment99008"><div class="xg_user_generated"><p>Thank you Patrick. sorry it was inadequate. Here's more detail. Note that that this design has an airspace between inner and outer restrictions like double combings and the wharram type but directs water flow away from the seal as commercial hatches do, unlike the wharram type, making the seal in fact optional as Isabel noted when I was on board wakataitea. This might be roughly similar to the traditional double combings in dryness or maybe better but simpler, cheaper, and lighter and no trash trap. Hanneke also liked it because it presents a broader more comfortable surface to sit on.</p>
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</blockquote> Glenn Tieman said:
Thank yo…tag:wharrambuilders.ning.com,2013-04-18:2195841:Comment:989702013-04-18T10:14:56.658Zboatsmithhttps://wharrambuilders.ning.com/profile/qe0j3ojqb10
<p><br></br> <br></br> <cite>Glenn Tieman said:</cite></p>
<blockquote cite="http://wharrambuilders.ning.com/forum/topics/hatches-which-are-real-wathertight?commentId=2195841%3AComment%3A98968&xg_source=activity#2195841Comment99008"><div><div class="xg_user_generated"><p>Thank you Patrick. sorry it was inadequate. Here's more detail. Note that that this design has an airspace between inner and outer restrictions like double combings and the wharram type but directs water flow away from the seal as…</p>
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<p><br/> <br/> <cite>Glenn Tieman said:</cite></p>
<blockquote cite="http://wharrambuilders.ning.com/forum/topics/hatches-which-are-real-wathertight?commentId=2195841%3AComment%3A98968&xg_source=activity#2195841Comment99008"><div><div class="xg_user_generated"><p>Thank you Patrick. sorry it was inadequate. Here's more detail. Note that that this design has an airspace between inner and outer restrictions like double combings and the wharram type but directs water flow away from the seal as commercial hatches do, unlike the wharram type, making the seal in fact optional as Isabel noted when I was on board wakataitea. This might be roughly similar to the traditional double combings in dryness or maybe better but simpler, cheaper, and lighter and no trash trap. Hanneke also liked it because it presents a broader more comfortable surface to sit on.</p>
<p>Thanks for the drawings. Looks good<a href="http://storage.ning.com/topology/rest/1.0/file/get/1930090588?profile=original" target="_self"><img width="721" class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/1930090588?profile=RESIZE_1024x1024"/></a></p>
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</blockquote> I know exactly what you and t…tag:wharrambuilders.ning.com,2013-04-18:2195841:Comment:989682013-04-18T04:17:28.260ZGlenn Tiemanhttps://wharrambuilders.ning.com/profile/GlennTieman
<p>I know exactly what you and the others mean about water coming in through those deck hatches. I used to have to heave to and bail out the forward compartments on the Pahi 26. One of the few changes I asked for on the Tama Moana was no fore and aft deck hatches which is how it is.</p>
<p>I think the question of whether water pressure could lift the cover, without deflectors, would apply equally to double combings. A solid wave will always only hit the hatch from one direction at a time. A…</p>
<p>I know exactly what you and the others mean about water coming in through those deck hatches. I used to have to heave to and bail out the forward compartments on the Pahi 26. One of the few changes I asked for on the Tama Moana was no fore and aft deck hatches which is how it is.</p>
<p>I think the question of whether water pressure could lift the cover, without deflectors, would apply equally to double combings. A solid wave will always only hit the hatch from one direction at a time. A wave from astern leaves an air gap drain out the front. A seal, or deflectors, at the bottom might still be dryer although I don't think people ever put a seal in the outer gap of double combings.</p> That's more like it,except th…tag:wharrambuilders.ning.com,2013-04-18:2195841:Comment:987772013-04-18T03:50:24.882ZPatrick John McGrathhttps://wharrambuilders.ning.com/profile/PatrickJohnMcGrath
<p>That's more like it,except there has to be a seal at the lower edge of the lid frame, <span style="font-size: 13px;">otherwise solid water pressure could force the lid upwards, allowing water in. Of course a drain from that space at the rear would relieve any pressure, but that assumes the water pressure was always coming from the front. (bows).</span></p>
<p><span style="font-size: 13px;">On my Nugget I had a small piece of angle moulding on the deck in front of the hatch cover to deflect…</span></p>
<p>That's more like it,except there has to be a seal at the lower edge of the lid frame, <span style="font-size: 13px;">otherwise solid water pressure could force the lid upwards, allowing water in. Of course a drain from that space at the rear would relieve any pressure, but that assumes the water pressure was always coming from the front. (bows).</span></p>
<p><span style="font-size: 13px;">On my Nugget I had a small piece of angle moulding on the deck in front of the hatch cover to deflect solid water over the top of the hatch. It worked.</span></p>
<p><span style="font-size: 13px;">I must admit I never experienced waves coming from behind, but then --as James postulates- a good multihull should run ahead of following waves.</span></p>
<p><span style="font-size: 13px;">I had a Buccaneer 28 trimaran which had convex decks on the floats. The hatch cover was plywood with rubber seal around all the edges, hinged on one side, with snap shackle type locks on the other. Worked fine in normal circumstances, but on one filthy black night, in the Summerville race on Lake Ontario, it was very rough, and we took about 100 litres of water in each float. That can spoil ones whole day (or night). :(</span></p> Thank you Patrick. sorry it w…tag:wharrambuilders.ning.com,2013-04-18:2195841:Comment:990082013-04-18T03:14:56.724ZGlenn Tiemanhttps://wharrambuilders.ning.com/profile/GlennTieman
<p>Thank you Patrick. sorry it was inadequate. Here's more detail. Note that that this design has an airspace between inner and outer restrictions like double combings and the wharram type but directs water flow away from the seal as commercial hatches do, unlike the wharram type, making the seal in fact optional as Isabel noted when I was on board wakataitea. This might be roughly similar to the traditional double combings in dryness or maybe better but simpler, cheaper, and lighter and no…</p>
<p>Thank you Patrick. sorry it was inadequate. Here's more detail. Note that that this design has an airspace between inner and outer restrictions like double combings and the wharram type but directs water flow away from the seal as commercial hatches do, unlike the wharram type, making the seal in fact optional as Isabel noted when I was on board wakataitea. This might be roughly similar to the traditional double combings in dryness or maybe better but simpler, cheaper, and lighter and no trash trap. Hanneke also liked it because it presents a broader more comfortable surface to sit on.</p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/1930090588?profile=original" target="_self"><img width="721" class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/1930090588?profile=RESIZE_1024x1024"/></a></p> Sorry about my Saturday post.…tag:wharrambuilders.ning.com,2013-04-18:2195841:Comment:990062013-04-18T03:07:31.511ZPatrick John McGrathhttps://wharrambuilders.ning.com/profile/PatrickJohnMcGrath
<p>Sorry about my Saturday post. I was completely off topic there. :(</p>
<p>Sorry about my Saturday post. I was completely off topic there. :(</p> Glen, maybe I am a bit thick,…tag:wharrambuilders.ning.com,2013-04-18:2195841:Comment:990052013-04-18T02:30:50.090ZPatrick John McGrathhttps://wharrambuilders.ning.com/profile/PatrickJohnMcGrath
<p>Glen, maybe I am a bit thick, but I don't understand your drawing.</p>
<p>Can you please explain how it works ?.</p>
<p>Glen, maybe I am a bit thick, but I don't understand your drawing.</p>
<p>Can you please explain how it works ?.</p> I don't get it. Maybe nobody…tag:wharrambuilders.ning.com,2013-04-18:2195841:Comment:989672013-04-18T02:22:34.706ZGlenn Tiemanhttps://wharrambuilders.ning.com/profile/GlennTieman
<p>I don't get it. Maybe nobody followed the link. Here is the way to make hatch combings that are dry for the same reason chandlery bought ones are. Doesn't anyone have anything to say? What are some criticisms? I heard of it during construction but didn't use it and now intend to chisel apart my combings at great cost to do it right.…</p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/1930092050?profile=original" target="_self"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/1930092050?profile=original" width="614"></img></a></p>
<p>I don't get it. Maybe nobody followed the link. Here is the way to make hatch combings that are dry for the same reason chandlery bought ones are. Doesn't anyone have anything to say? What are some criticisms? I heard of it during construction but didn't use it and now intend to chisel apart my combings at great cost to do it right.</p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/1930092050?profile=original" target="_self"><img width="614" class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/1930092050?profile=original"/></a></p> Yes. I used that hatch cover…tag:wharrambuilders.ning.com,2013-04-17:2195841:Comment:988552013-04-17T22:42:29.584ZPatrick John McGrathhttps://wharrambuilders.ning.com/profile/PatrickJohnMcGrath
<p>Yes. I used that hatch cover design on my Piver Nugget in 1964.</p>
<p>It worked very well, but was not completely waterproof.</p>
<p>When completely swamped water could still be squirted in thru the drainholes. </p>
<p>Yes. I used that hatch cover design on my Piver Nugget in 1964.</p>
<p>It worked very well, but was not completely waterproof.</p>
<p>When completely swamped water could still be squirted in thru the drainholes. </p>