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Jon and V Boat Conversions & Modifications
1981, 18' Springbok (Alcan Jumbo) restoration
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<blockquote data-quote="speo" data-source="post: 410980" data-attributes="member: 20658"><p>Here is the foam that I can't trust, so I will replace all of it. </p><p></p><p>Based on my measurements, the rear bench (3rd counting from the bow towards the aft) can hold about 5 cubic foot of foam. </p><p></p><p>The first and second benches are not as wide as the 3rd, but they are deeper, so probably those can also hold about 5 cubic ft each.</p><p></p><p>The rear port and starboard benches can hold about 2 cubic ft each, as well.</p><p></p><p>That makes a total of about 19 cubic foot of foam or about 4 boards of 4' x 8' x 2".</p><p></p><p>If each cubic ft of foam can hold about 60 lb of weight, that means, if I fill up all my benches, I will have 19 x 60 = 1140lb boat and cargo weight (in the air) that will not sink in case it gets swamped.</p><p></p><p>If the boat gets swamped, part of the cargo, motor, passengers will became partially submerged, and will be pushed up by the water with a force equal with the weight of the amount of water displaced, so the actual weight of the swamped boat and cargo can be higher than 1140 and still not sink.</p><p></p><p>I hope my math is correct <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="speo, post: 410980, member: 20658"] Here is the foam that I can't trust, so I will replace all of it. Based on my measurements, the rear bench (3rd counting from the bow towards the aft) can hold about 5 cubic foot of foam. The first and second benches are not as wide as the 3rd, but they are deeper, so probably those can also hold about 5 cubic ft each. The rear port and starboard benches can hold about 2 cubic ft each, as well. That makes a total of about 19 cubic foot of foam or about 4 boards of 4' x 8' x 2". If each cubic ft of foam can hold about 60 lb of weight, that means, if I fill up all my benches, I will have 19 x 60 = 1140lb boat and cargo weight (in the air) that will not sink in case it gets swamped. If the boat gets swamped, part of the cargo, motor, passengers will became partially submerged, and will be pushed up by the water with a force equal with the weight of the amount of water displaced, so the actual weight of the swamped boat and cargo can be higher than 1140 and still not sink. I hope my math is correct :) [/QUOTE]
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Jon and V Boat Conversions & Modifications
1981, 18' Springbok (Alcan Jumbo) restoration
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