Ride plate/setback ????'s
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Ride plate/setback ????'s

  1. #1
    The Good mrjoshua's Avatar
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    Default Ride plate/setback ????'s

    Any benefit to a ride plate w/o setting back the pump? I have a 18' Tahiti W/ a SplitBolwl and diverter. I have not tried the various straight or droop combinations first. It will have a new BBC W/ an"A" impeller. It previously had only a "C" bowl with limited runs W/ diverter so I do not have a "baseline" for comparison. How is the setback determined? Any opinions?

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    LIQUID QUARTER MILE Pro Mod's Avatar
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    rideplate and shoe is always good wouldnt worry about setback on that hull
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    About 500' AGL MudPumper's Avatar
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    Quote Originally Posted by mrjoshua View Post
    Any benefit to a ride plate w/o setting back the pump? I have a 18' Tahiti W/ a SplitBolwl and diverter. I have not tried the various straight or droop combinations first. It will have a new BBC W/ an"A" impeller. It previously had only a "C" bowl with limited runs W/ diverter so I do not have a "baseline" for comparison. How is the setback determined? Any opinions?
    If you are pulling the intake to be machined for a shoe/rideplate, that would be the time to do the setback if you decide to set it back.

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    Senior Member DuaneHTP's Avatar
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    rideplate and shoe is always good wouldnt worry about setback on that hull
    x 2

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    The Good mrjoshua's Avatar
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    How is set back determined?

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    Senior Member Brendellajet's Avatar
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    Quote Originally Posted by mrjoshua View Post
    How is set back determined?
    Trial and error. X3 per the above. Save your money for another hull if you want to go faster.
    "He is a lover, not a fighter. But he's also a fighter, so dont get any ideas."

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    Quote Originally Posted by mrjoshua View Post
    How is set back determined?
    Set back provides opportunity to minimize hull wetted surface and consequential drag. It moves the lever arm about the CG establishing hull attitude while making best use of available thrust. A ride plate is a must with the set back but very effective without set back. To set the pump back you need to understand the boat's CG and ride angle. With this information and a factor for wetted surface drag you can set the pump to the best thrust angle. Without the information above you will be doing a huge amount of work that may not net the results you desire. Remember also that when the pump is further back the intake is also further back further allowing less wetted surface.
    Last edited by ttmott; 10-25-2010 at 07:32 PM.

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    Senior Member ol guy's Avatar
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    Quote Originally Posted by mrjoshua View Post
    any benefit to a ride plate w/o setting back the pump? I have a 18' tahiti w/ a splitbolwl and diverter. I have not tried the various straight or droop combinations first. It will have a new bbc w/ an"a" impeller. It previously had only a "c" bowl with limited runs w/ diverter so i do not have a "baseline" for comparison. How is the setback determined? Any opinions?
    what year tahiti??

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    The Good mrjoshua's Avatar
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    76' super tiger

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    B1 Racing cs19's Avatar
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    For sure do the shoe and rideplate, setback depending on how long you are keeping the boat and what your goals are.

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    The Good mrjoshua's Avatar
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    It's going to be a ski/cruiser first. Building a BBC 461 or 468 (depending on how much i have to bore it.) Comp roller cam 256/302 .566 and roller rockers. single plane intake and 850 dp mech secondaries. 9.5:1 compression. W/ "A" impeller. I'm not sure how much HP or Rev I'll see at our altitudes but should be faster than my old 455 and 50-55 mph. i used to get. Will the ride plate help with planing out faster and also "air the boat out" a little more? I know this is not a "speed" hull. This will be a lake boat sometimes on 1-1.5 ft waves. will stability be affected?

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    Senior Member jetboatperformance's Avatar
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    Mj, heres an example setback Berkeley on a similar Tahiti completed last season , worked out well call Josh or myself if we can help Tom


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    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    Mj, heres an example setback Berkeley on a similar Tahiti completed last season , worked out well call Josh or myself if we can help Tom

    Tom, not to jump topic here but do you have any better pics of those two Suction Housing pressure-tap locations?
    Thanks, Ray
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    Mj, heres an example setback Berkeley on a similar Tahiti completed last season , worked out well call Josh or myself if we can help Tom

    Wait a second there...I think I recognize that transom.lol Hammer..I believe you want the taps about 1 inch in front of the wear ring...pretty much as high..and low as you can get them. Ever since this was posted ....I wondered how a tahiti would act with a set back....I wondered if it would make them shut down better...worse...or about the same. My old one spooked me a couple of times...and that was only doing 70 ish.
    Another Hot Boat refugee

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