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Hopefully this image will serve as a visual reference:[ATTACH=full]74601[/ATTACH]Part #46 and #47...that's the baffle system for a Yamaha VX110, and this is basically what I copied from for my design.The exhaust is contained within the space formed by the tunnel (basically a large box made from 1/4 aluminum plate) that the jet pump bolts up into. There's about 2 inches of clearance between the exhaust flange and the stator assembly of the pump. At no point does it actually go through the jet pump. The rubber skirting is notched to fit around the pump, and it's basically about where the exit nozzle bolts to the back end of the stator vane assembly.So, basically what happens is that the exhaust passes through the flange on the top side of the box, and then the sound gets trapped inside of that, with the flexible rubber skirting allowing the sound to pass through along the edges of the pump, and along the bottom edge where the ride plate is. While it's not directly being injected into the aerated water from the exit nozzle, the sound is exiting close enough to this that the sound is diminished a good deal by the water exiting the pump, as opposed to having the exhaust routed like a typical PWC, where it's just a hole right out the back of the boat, that allows all the sound to escape with no baffling.
Hopefully this image will serve as a visual reference:
[ATTACH=full]74601[/ATTACH]
Part #46 and #47...that's the baffle system for a Yamaha VX110, and this is basically what I copied from for my design.
The exhaust is contained within the space formed by the tunnel (basically a large box made from 1/4 aluminum plate) that the jet pump bolts up into. There's about 2 inches of clearance between the exhaust flange and the stator assembly of the pump. At no point does it actually go through the jet pump. The rubber skirting is notched to fit around the pump, and it's basically about where the exit nozzle bolts to the back end of the stator vane assembly.
So, basically what happens is that the exhaust passes through the flange on the top side of the box, and then the sound gets trapped inside of that, with the flexible rubber skirting allowing the sound to pass through along the edges of the pump, and along the bottom edge where the ride plate is. While it's not directly being injected into the aerated water from the exit nozzle, the sound is exiting close enough to this that the sound is diminished a good deal by the water exiting the pump, as opposed to having the exhaust routed like a typical PWC, where it's just a hole right out the back of the boat, that allows all the sound to escape with no baffling.
