SoCal Jet Boats
Tech Talk => Jet Pumps => Topic started by: 78 PROPDUSTER on August 16, 2008, 07:21:43 AM
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I had some jet guys are telling me that the water out of the pump is twisting under a fast pass, say they have never seen this before. Any ideas on whats going on? 12JG, droop, MPD worked.
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My only guess is that Jack probably took the divider that was in the droop out . Those are supposed to straighten the water out for whatever sreason . One of the first things he'll tell you is to get rid of it so ......... Well that my guess anyways 8)
-beerjet-
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We see that all of the time on the fabricated snoots, kinda cool, the vanes inside a "G" bowl are about two inches shorter than that of a "C", (also called the stator) when the water leaves a fabbed snoot there's nothing to stop the rotation, doesn't hurt the top end I don't believe, but does seem to make the boat a little more "loose" sort of like driving in sand.
You can really see this if you run in really shallow water and pull a little mud off the bottom, looks like a swirled ice cream cone ;)
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You can really see this if you run in really shallow water and pull a little mud off the bottom, looks like a swirled ice cream cone ;)
ewww :o ;D
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ewww :o ;D
Oh come on now, you don't like to "pull a little mud off the bottom once in while"... >:D
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Oh come on now, you don't like to "pull a little mud off the bottom once in while"... >:D
(https://www.socaljetboats.com/cpg/albums/userpics/10034/dude.gif) (https://www.socaljetboats.com/cpg/albums/userpics/10034/dude.gif) (https://www.socaljetboats.com/cpg/albums/userpics/10034/dude.gif) (https://www.socaljetboats.com/cpg/albums/userpics/10034/dude.gif) (https://www.socaljetboats.com/cpg/albums/userpics/10034/dude.gif) (https://www.socaljetboats.com/cpg/albums/userpics/10034/dude.gif)
-beerjet-
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(https://www.socaljetboats.com/cpg/albums/userpics/10034/dude.gif) (https://www.socaljetboats.com/cpg/albums/userpics/10034/dude.gif) (https://www.socaljetboats.com/cpg/albums/userpics/10034/dude.gif) (https://www.socaljetboats.com/cpg/albums/userpics/10034/dude.gif) (https://www.socaljetboats.com/cpg/albums/userpics/10034/dude.gif) (https://www.socaljetboats.com/cpg/albums/userpics/10034/dude.gif)
-beerjet-
lolz! yeah i guess ive done it once or twice >:D
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Good info! Thanks
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Old school engineering for you. We saw the same thing back in the day. We thought that water swirling was not going in the direction we wanted it to go. We ended up sharpening and cupping the stator vanes with a dye grinder and lake tested it, back and forth until the water was straight. Took a hell of a lot of work, little if any gain since we did not have GPS or accelerometer then to test, but we accomplished what we set out to do.
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Oh come on now, you don't like to "pull a little mud off the bottom once in while"... >:D
Don't put your helmet back there then. Unless you don't mind a little mud on the helmet.
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Don't put your helmet back there then. Unless you don't mind a little mud on the helmet.
It'll clean up... :-*
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Those are supposed to straighten the water out for whatever sreason .
-beerjet-
As it was explained to me by Dave at Aggressor, the purpose of the divider is to straighten the water flow out to prevent it from going into a boil.