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Jon and V Boat Conversions & Modifications
Jet Jon Build Pics ...VIDEOS LINKED!!!!!!
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<blockquote data-quote="PSG-1" data-source="post: 227760" data-attributes="member: 6937"><p>On my boat, I didn't build any type of spoon.</p><p></p><p>[ATTACH=full]29859[/ATTACH]</p><p></p><p>You can see the center strake of the boat in this photo, before the jet unit was installed. I ran it with this center strake for a year or so, and in conjunction with the top loader grate, there wasn't much of an issue with cavitation.</p><p></p><p>But when I went back to a conventional grate and modified it to be a pivoting weedless grate, the cavitation showed up again. So, what I did was to take my sawzall, lay the blade sideways, and cut about 3 feet of that strake off the boat, taking it down flush to the hull in that area forward of the pump. Then, to cap it off, I used a piece of 1/4" plate, cut to the necessary width and length to cover up the void, then welded it to the hull, leak tested, and sealed with paint. (I don't have a pic of it right now, I'll try to remember to take one today)</p><p></p><p>My boat runs pretty good without the spoon, perhaps it would have better hook-up in choppy water if I HAD built a spoon in the hull, I'm not sure.</p><p></p><p>One option we discussed doing on the next build is a 'dropped hull' Basically, cutting out the hull and modifying it to be dropped lower than the rest of the hull by about 2 inches, setting the engine and pump as low as possible. From the transom end, the drop hull would appear to be a 'V' with the point flattened out...about as wide as the pump/engine area, then tapering down to nothing toward the forward end.</p><p></p><p>We figure setting the pump lower than the rest of the hull ought to allow for running in the snottiest conditions possible, with no cavitation.</p></blockquote><p></p>
[QUOTE="PSG-1, post: 227760, member: 6937"] On my boat, I didn't build any type of spoon. [ATTACH type="full" alt="Jet Pump Cut-Out Reinforcement.jpg"]29859._xfImport[/ATTACH] You can see the center strake of the boat in this photo, before the jet unit was installed. I ran it with this center strake for a year or so, and in conjunction with the top loader grate, there wasn't much of an issue with cavitation. But when I went back to a conventional grate and modified it to be a pivoting weedless grate, the cavitation showed up again. So, what I did was to take my sawzall, lay the blade sideways, and cut about 3 feet of that strake off the boat, taking it down flush to the hull in that area forward of the pump. Then, to cap it off, I used a piece of 1/4" plate, cut to the necessary width and length to cover up the void, then welded it to the hull, leak tested, and sealed with paint. (I don't have a pic of it right now, I'll try to remember to take one today) My boat runs pretty good without the spoon, perhaps it would have better hook-up in choppy water if I HAD built a spoon in the hull, I'm not sure. One option we discussed doing on the next build is a 'dropped hull' Basically, cutting out the hull and modifying it to be dropped lower than the rest of the hull by about 2 inches, setting the engine and pump as low as possible. From the transom end, the drop hull would appear to be a 'V' with the point flattened out...about as wide as the pump/engine area, then tapering down to nothing toward the forward end. We figure setting the pump lower than the rest of the hull ought to allow for running in the snottiest conditions possible, with no cavitation. [/QUOTE]
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Jet Jon Build Pics ...VIDEOS LINKED!!!!!!
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