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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: 227688" data-attributes="member: 6937"><p>For all visual purposes, the area you have shown in red indicates the location and shape of the air pocket that is forming as the boat moves across the water. This is most likely the source of the majority of your cavitation.</p><p></p><p>The area that I was initially referring to, is on the BACK end of that hump, where your pump bolts into the hull. From previous photos, it looked like there was a step in the transition between hull and pump, like the pump may be inset from flush with the hull by about 1/2" or so. If that's so, then, that step could also cause some issues with cavitation.</p><p></p><p>But after seeing the drawing you did, I would also tend to agree with your assessment about that step on the front side of the hump causing the problem. That is a pretty large step, and if it does not transition in some type of smooth taper, it will definitely create an air pocket, a large one in fact, likely enough to cause it to cavitate. It's not cavitating on flat water because the hull is flat out, and has displaced the air from underneath, and will continue to run as such until you hit some chop, which allows air to get between the hull and the water. With a flat bottom or a spoon, this isn't an issue, as the air is displaced or dissipated by the time it reaches the pump. But if you have something on the hull that breaks up the smooth transition of the water, the air is going to collect at this point, and 'bleed off" toward the pump intake, causing it to suck up the air and cavitate.</p></blockquote><p></p>
[QUOTE="PSG-1, post: 227688, member: 6937"] For all visual purposes, the area you have shown in red indicates the location and shape of the air pocket that is forming as the boat moves across the water. This is most likely the source of the majority of your cavitation. The area that I was initially referring to, is on the BACK end of that hump, where your pump bolts into the hull. From previous photos, it looked like there was a step in the transition between hull and pump, like the pump may be inset from flush with the hull by about 1/2" or so. If that's so, then, that step could also cause some issues with cavitation. But after seeing the drawing you did, I would also tend to agree with your assessment about that step on the front side of the hump causing the problem. That is a pretty large step, and if it does not transition in some type of smooth taper, it will definitely create an air pocket, a large one in fact, likely enough to cause it to cavitate. It's not cavitating on flat water because the hull is flat out, and has displaced the air from underneath, and will continue to run as such until you hit some chop, which allows air to get between the hull and the water. With a flat bottom or a spoon, this isn't an issue, as the air is displaced or dissipated by the time it reaches the pump. But if you have something on the hull that breaks up the smooth transition of the water, the air is going to collect at this point, and 'bleed off" toward the pump intake, causing it to suck up the air and cavitate. [/QUOTE]
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Jet Jon Build Pics ...VIDEOS LINKED!!!!!!
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