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Aluminum Hulls
On Wed, 9 Dec 2009 13:08:20 -0800 (PST), Bob La Londe
wrote: On Nov 29, 6:28*pm, "Bob La Londe" wrote: I find it interesting that a lot of the small boat aluminum designs seem to say the main hull should be 3/16 and yet .100 is used in a heck of a lot of commercially available small boats. *.125 is considered heavy duty. *Is it just CYA? Anyway, getting back to my original point. A lot of commercially available boats seem to be made out of a lot light sheet than the designers are reccomending in the boat plans they are selling. http://www.seaarkboats.com/boat.php?...&boat=Big+Easy For example: The link above is to a medium V design 24 footer. The specs says .125 thick sheet. I can't buy a plan to build a boat that size designed for .125 sheet. Most of the ones I have seen want to spec .1875 which basically means .190. Now why is that? Is it just the typical over building to cover your dearie aere, or are all those commercial boat builders building inadequate boats and damn the liability? I wonder whether you are comparing designs that could be in one case simply a covering attached to a structural frame where the skin only keeps the water out while the structure provides the strength versus a design where the skin provides some of the total structure strength? Think of the original kayak design versus a stitch and glue dinghy with no internal frames for exaggerations of this concept. I remember reading that some of the British Steel 70-footers found dented plating around the bow after leaving the Southern Ocean. the answer was to add frames to the bow section for the next year's race, not increase the thickness of the plating. In other words the thickness of the plating was not considered a factor in the strength of the bow portions. The frames provided the strength while the plating kept the water out. Cheers, Bruce (bruceinbangkokatgmaildotcom) |
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