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Jet Boats
General Jet Boat Discussions
Need Input from the jet Jon gurus
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<blockquote data-quote="CedarRiverScooter" data-source="post: 460995" data-attributes="member: 15465"><p>I am not a guru but visit Tinboats almost every day, so here goes . . .</p><p></p><p>I have rebuilt my jet jon twice now, & have been thinking of yet another tweak to make it better.</p><p></p><p>I have the plastic tunnel-motor mount glued & screwed in; it is set to be the low point of the hull.</p><p></p><p>In front of that,I have a tapered panel that extends about 4 foot fwd (It is actually the drop out from the big hole I cut for the tunnel).</p><p></p><p>I still get some cavitation when in a chop over about 2 or 3 inches It can depend on whether you are going into vs. with wind.</p><p></p><p>I am now contemplating adding a keel pad to extend farther fwd; the intention is to push the air farther to the sides. I also have a porposing issue above 30 mph, which I think is partly caused by the tapered panel being right at the planing break.</p><p></p><p>I am thinking of using UMHW plastic for this new keel pad, but most likely will prototype it with a fiberglassed panel 1st (as I could be way off-base).</p><p></p><p>I wish there was someone with software that could run simulations for these 1 off designs.</p><p></p><p>Edit - getting back to your question on spoons, I tried making one but it wasn't very effective. If I could have bought something like that already formed, it might have worked better for me. YMMV</p><p></p><p>Good luck on your build - post some photos!</p></blockquote><p></p>
[QUOTE="CedarRiverScooter, post: 460995, member: 15465"] I am not a guru but visit Tinboats almost every day, so here goes . . . I have rebuilt my jet jon twice now, & have been thinking of yet another tweak to make it better. I have the plastic tunnel-motor mount glued & screwed in; it is set to be the low point of the hull. In front of that,I have a tapered panel that extends about 4 foot fwd (It is actually the drop out from the big hole I cut for the tunnel). I still get some cavitation when in a chop over about 2 or 3 inches It can depend on whether you are going into vs. with wind. I am now contemplating adding a keel pad to extend farther fwd; the intention is to push the air farther to the sides. I also have a porposing issue above 30 mph, which I think is partly caused by the tapered panel being right at the planing break. I am thinking of using UMHW plastic for this new keel pad, but most likely will prototype it with a fiberglassed panel 1st (as I could be way off-base). I wish there was someone with software that could run simulations for these 1 off designs. Edit - getting back to your question on spoons, I tried making one but it wasn't very effective. If I could have bought something like that already formed, it might have worked better for me. YMMV Good luck on your build - post some photos! [/QUOTE]
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Need Input from the jet Jon gurus
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