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  • AG6's Avatar
    06-27-2017, 11:25 PM
    AG6 replied to a thread Porpusing in Vintage Jet Boats only
    I would talk with cp again, explain your symptoms and vids are always helpful. Like a before and after way to document the progress. They should be able to set you with a long enough ride plate. Tabs would work. But way overkill and 3X the cost and headache to install. An adjustable ride plate will make all the difference in the world. How much of a droop did you go? 4"??? Dean
    1 replies | 6 view(s)
  • AG6's Avatar
    06-27-2017, 07:59 PM
    AG6 replied to a thread Porpusing in Vintage Jet Boats only
    Hi Dave, Porpoising is a very simple thing to understand. It is caused when the hull of the boat is at the Apex, and trying to 'climb out of the hole' or over the crest of the wave of water its on, if you will. Another words, the boat is at a teetering point(like a see-saw) and the balanced is being upset. Not enough drag to hold down the nose, when you lift the bow(bring the nozzle up) so it starts to teeter up and down. One excellent way to correct this, is the use of a "Ride Plate" under the bowl of your pump. This in effect tricks the hull in to thinking its longer than it is, and creates enough surface drag (or parasitic drag) to actually compensate for this bouncing. Most of the Jet boat guys use these for this reason, and you'll notice that you may also pick up a few MPH and better handling as well. CP, PJB and many of the aftermarket boat part house carry these, but I'd recommend you take the boat with you and some current video of how its reacting. This will give these folks the info they are going to ask for, to help you select a ride plate. Almost all boats have this issue. I/O's (like my Biesemeyer) has it too, I just use trim tabs to correct it. Good luck, Hope this all helped. Dean.
    1 replies | 21 view(s)
  • AG6's Avatar
    06-25-2017, 09:32 AM
    Ok, I guess I forgot to upload the others too... https://youtu.be/WzTKcHKCR1Y
    1 replies | 127 view(s)
  • "THE ADVOCATE"'s Avatar
    06-23-2017, 02:58 PM
    That's how I feel and I have to jump into cold water before I walk on the beach sometimes just because.
    1 replies | 96 view(s)
  • T8er S.'s Avatar
    06-22-2017, 02:34 PM
    T8er S. started a thread How you should act in VJB Videos
    This is one of the best videos I've seen for proper jet boat enthusiasm. https://youtu.be/gFp-4mlHs9E :drv:
    1 replies | 96 view(s)
  • T8er S.'s Avatar
    06-21-2017, 01:41 PM
    T8er S. replied to a thread WTB No dipstick? in Boat Parts for Sale
    You'll have to buy one. Just figure out which side it's on. https://www.summitracing.com/search/part-type/engine-oil-dipsticks/make/chevrolet/model/v3500/engine-size/7-4l-454/oil-dipstick-location/passenger-side :zdrool:
    9 replies | 152 view(s)
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8 Visitor Messages

  1. View Conversation
    hey david guess we can take the stolen boat off here cant get any word from sheriffs dept on it
    lazy deputy's i guess!
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    David< I have a video on here some where and I am trying to put it on my page. Any suggestions? Thanks Dave
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    It took me 45 min just to post my pic once I got the rythme!
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    This new site is kicking my ***!! WTF? I was having a hard time with the old one, then was on my boat all summer log, then you screw it up even worse!!Im soo sucking at this! I'm great w/comps , but somehow you just made it so you need to be a hacker to navagate this site!! what happenneed?
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    Yes sir, no problems at all. Mike <SJ-16>
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    Thanks, and glad to see the new forum coming together. Mike <SJ-16>
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    Gracious Amigo!!!!! Some of those old pics make me wonder why I couldnt spell my own boats name right! LOL!
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    hello david we spoke yesterday on the phone. i have just noticed i cannot find my thread on the cove. it was the one that said newbie with a '75 challenger etc.
    i did a search and found it but it's not listed on the cove anymore for reason. unless i am completely blind which is possible.
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About David

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I am the owner of vintagejetboats.com, vjbforum.com, & vjb4um.com, Come and check us out and share your Vintage Jet Boat experiences with other enthusiasts!
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