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#1
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Shanty Hull Bulkhead Advice
Dear group,
I was recently cruising around the web looking at some shanty boat plans, and noticed that none of the 5 or 6 plans i saw had any bulkheads in the framing that would prevent the entire one piece hull from filling with water should the hull be punctured. David Beede from the Simplicity Boats website has a great concept design of a hull with nice framing and plenty of beef to it. In the size of hull he drew, it has a 4000 lb displacement with about a 4" draft. It would be a great hull design. I was wondering if anyone had any advice for proper placement of bulkheads in a shanty one piece hull. This would be much easier to build than individual pontoons with bulkheads. Any thoughts? Thanks.. M Russon |
#2
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For each watertight compartment, figure the flooded waterline and make sure
the bulkheads are significantly higher (remember the Titanic). Roger http://home.earthlink.net/~derbyrm "MRusson" wrote in message ... Dear group, I was recently cruising around the web looking at some shanty boat plans, and noticed that none of the 5 or 6 plans i saw had any bulkheads in the framing that would prevent the entire one piece hull from filling with water should the hull be punctured. David Beede from the Simplicity Boats website has a great concept design of a hull with nice framing and plenty of beef to it. In the size of hull he drew, it has a 4000 lb displacement with about a 4" draft. It would be a great hull design. I was wondering if anyone had any advice for proper placement of bulkheads in a shanty one piece hull. This would be much easier to build than individual pontoons with bulkheads. Any thoughts? Thanks.. |
#3
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Another option would be to fill between the bulkheads (between the bottom
and the floor) with expanding foam floatation. I'm not sure this would have helped on the Titanic... Ed -- When replying via email, replace spam with speak in the address. "Roger Derby" wrote in message ink.net... For each watertight compartment, figure the flooded waterline and make sure the bulkheads are significantly higher (remember the Titanic). Roger http://home.earthlink.net/~derbyrm "MRusson" wrote in message ... Dear group, I was recently cruising around the web looking at some shanty boat plans, and noticed that none of the 5 or 6 plans i saw had any bulkheads in the framing that would prevent the entire one piece hull from filling with water should the hull be punctured. David Beede from the Simplicity Boats website has a great concept design of a hull with nice framing and plenty of beef to it. In the size of hull he drew, it has a 4000 lb displacement with about a 4" draft. It would be a great hull design. I was wondering if anyone had any advice for proper placement of bulkheads in a shanty one piece hull. This would be much easier to build than individual pontoons with bulkheads. Any thoughts? Thanks.. |
#4
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I always figured that kind of flotation would make the boat very stable in
the inverted position. I'm putting my flotation as high under the side decks as it will go. Not much would have helped the Titanic. According to the latest theories, they got their rivets from the lowest bidder. The shock of the collision just unzipped the hull. Before people went down and explored the wreck, the thought was that after one or two compartments flooded, the water spilled over the top of the bulkheads which were not full height. A typical English shipyard job according to Patrick O'Brian. The Royal Navy's best ships were the many they captured from the French. Roger http://home.earthlink.net/~derbyrm "Ed Edelenbos" wrote in message ... Another option would be to fill between the bulkheads (between the bottom and the floor) with expanding foam floatation. I'm not sure this would have helped on the Titanic... -- "Roger Derby" wrote in message ink.net... For each watertight compartment, figure the flooded waterline and make sure the bulkheads are significantly higher (remember the Titanic). "MRusson" wrote in message ... Dear group, I was recently cruising around the web looking at some shanty boat plans, and noticed that none of the 5 or 6 plans i saw had any bulkheads in the framing that would prevent the entire one piece hull from filling with water should the hull be punctured. David Beede from the Simplicity Boats website has a great concept design of a hull with nice framing and plenty of beef to it. In the size of hull he drew, it has a 4000 lb displacement with about a 4" draft. It would be a great hull design. I was wondering if anyone had any advice for proper placement of bulkheads in a shanty one piece hull. This would be much easier to build than individual pontoons with bulkheads. Any thoughts? Thanks.. |
#5
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Roger,
Thanks for the advice. I figure that i will make the bulkheads so they completely separate the sections in the hull, and are set top to bottom and side to side. This way, if the hull gets "holed" i can have separate compartments isolated from each other. The hull is basically 8 feet wide by 17 feet long. I will most likely divide the hull into 6 sections. Thanks for the info. M Russon On Fri, 09 Sep 2005 16:41:52 GMT, "Roger Derby" wrote: For each watertight compartment, figure the flooded waterline and make sure the bulkheads are significantly higher (remember the Titanic). |
#6
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"Roger Derby" wrote in message
ink.net... I always figured that kind of flotation would make the boat very stable in the inverted position. I'm putting my flotation as high under the side decks as it will go. I'd figure in a case like a shanty, it would fill the space with enough closed cell material that the water would have no place to get in. I see your point though. The pourable stuff is pretty good at adhering to a wooden hull. The thing about a shanty hull (as long as I'm on the same page definition-wise, essentially a barge with a box on top), is that it is (for the most part) only good for sitting. And, even at that, they better be at a pretty protected place. Unless the water is pretty darned still, they displace too much water (and airspace for that matter) to move efficiently. At least a pontoon boat (as long as the pontoons are pretty parallel) displaces much less water and wind is the real force to fight when underway. Ed Not much would have helped the Titanic. According to the latest theories, they got their rivets from the lowest bidder. The shock of the collision just unzipped the hull. Before people went down and explored the wreck, the thought was that after one or two compartments flooded, the water spilled over the top of the bulkheads which were not full height. A typical English shipyard job according to Patrick O'Brian. The Royal Navy's best ships were the many they captured from the French. Roger http://home.earthlink.net/~derbyrm "Ed Edelenbos" wrote in message ... Another option would be to fill between the bulkheads (between the bottom and the floor) with expanding foam floatation. I'm not sure this would have helped on the Titanic... -- "Roger Derby" wrote in message ink.net... For each watertight compartment, figure the flooded waterline and make sure the bulkheads are significantly higher (remember the Titanic). "MRusson" wrote in message ... Dear group, I was recently cruising around the web looking at some shanty boat plans, and noticed that none of the 5 or 6 plans i saw had any bulkheads in the framing that would prevent the entire one piece hull from filling with water should the hull be punctured. David Beede from the Simplicity Boats website has a great concept design of a hull with nice framing and plenty of beef to it. In the size of hull he drew, it has a 4000 lb displacement with about a 4" draft. It would be a great hull design. I was wondering if anyone had any advice for proper placement of bulkheads in a shanty one piece hull. This would be much easier to build than individual pontoons with bulkheads. Any thoughts? Thanks.. |
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