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Jon and V Boat Conversions & Modifications
Seadoo and 14ft Jon marriage- jetjon
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<blockquote data-quote="PSG-1" data-source="post: 320978" data-attributes="member: 6937"><p>Can't believe I missed this thread when it first came up. Sorry for the extremely late reply.</p><p></p><p>Anyhow, welcome to the board, and welcome to the hobby of jet john building. I've seen a lot of jet johns built the way you're describing, and indeed, they run just the same as the ones with bolt-in ducts. The question is, the expansion rate of aluminum vs. fiberglass as you described. I can't definitively say how well this type of setup will hold up over time.</p><p></p><p>Typically, you'll want to cut the opening in the boat, and then cut the hull out of the jet ski with the pump and motor mounting areas as one solid piece, and cut the fiberglass hull larger than the opening of your boat. Then the fiberglass hull is placed from the inside of the boat, bolted, and sealed.</p><p></p><p>As for how to secure it, this is not really my area of expertise, and it's why I didn't use this method to build my boat, as fiberglass isn't my thing, welding and machining is what I know. I would think you could do some glasswork to the cut edges, and beef them up, so you can drill mounting holes to secure it to the boat.</p><p></p><p>For sealant, 5200 is good stuff, but RTV ultra black is what's generally used to secure jet pumps to hulls, and it has a very strong bond, but not ridiculously strong like 5200.</p><p></p><p>Again, my expertise isn't in working with the fiberglass. But when you get into the engine, mechanical, electrical, etc, let me know, I'll be glad to give advice.</p><p></p><p>If you have any questions, e-mail me at PSG1Shooter@ REMOVETHIS gmail.com</p><p></p><p></p><p>Keep us posted on the progress, and be sure to post pics as it moves along!</p></blockquote><p></p>
[QUOTE="PSG-1, post: 320978, member: 6937"] Can't believe I missed this thread when it first came up. Sorry for the extremely late reply. Anyhow, welcome to the board, and welcome to the hobby of jet john building. I've seen a lot of jet johns built the way you're describing, and indeed, they run just the same as the ones with bolt-in ducts. The question is, the expansion rate of aluminum vs. fiberglass as you described. I can't definitively say how well this type of setup will hold up over time. Typically, you'll want to cut the opening in the boat, and then cut the hull out of the jet ski with the pump and motor mounting areas as one solid piece, and cut the fiberglass hull larger than the opening of your boat. Then the fiberglass hull is placed from the inside of the boat, bolted, and sealed. As for how to secure it, this is not really my area of expertise, and it's why I didn't use this method to build my boat, as fiberglass isn't my thing, welding and machining is what I know. I would think you could do some glasswork to the cut edges, and beef them up, so you can drill mounting holes to secure it to the boat. For sealant, 5200 is good stuff, but RTV ultra black is what's generally used to secure jet pumps to hulls, and it has a very strong bond, but not ridiculously strong like 5200. Again, my expertise isn't in working with the fiberglass. But when you get into the engine, mechanical, electrical, etc, let me know, I'll be glad to give advice. If you have any questions, e-mail me at PSG1Shooter@ REMOVETHIS gmail.com Keep us posted on the progress, and be sure to post pics as it moves along! [/QUOTE]
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Seadoo and 14ft Jon marriage- jetjon
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