"spoon"??
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"spoon"??

  1. #1
    Senior Member $uperJoe's Avatar
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    Default "spoon"??

    talking with a fiberglass guy over the weekend about jet intake placement and how to set it and a new to me term came up. it was a small gradual extrusion in front of the intake. it stuck below the boat maybe less than half inch and appeared to be about the width of the intake wide and maybe 10 inches front to back. he called it a "spoon". i suppose because it looks like the underside of a spoon on the bottom of the boat. i didnt have time to ask what it was for as he was a busy guy. can anyone help me with the idea behind this please?

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    Senior Member Sharkbit's Avatar
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    Drop keel.

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    Senior Member $uperJoe's Avatar
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    i suppose that could also be what it is called. i dont know though. what does a drop keel do?

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    Senior Member Oldsquirt's Avatar
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    Go to the kitchen and grab a spoon. Turn on the faucet and hold the spoon with the handle up and the bottom of spoon in the water stream. Look at what the water does as it comes off the end of the spoon. Think about what that does to water passing under a "spoon" on the keel just in front of the intake.

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    Senior Member $uperJoe's Avatar
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    that seems as it would be very beneficial to loading a jet. is this to eliminate a loader or aid in its operation?

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    Senior Member Oldsquirt's Avatar
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    It would be "in addition to" any other underwater hardware.

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    Senior Member $uperJoe's Avatar
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    Quote Originally Posted by Oldsquirt View Post
    It would be "in addition to" any other underwater hardware.
    ok then. learning lots here now that i finally have terms to ask about.

    he said the intake was reset to 4* instead of the 4.5* it was at because of the lower hp.
    is this based on the mount surface, lower in the rear and a base line of flat with the keel?
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    Senior Member TrollerDave's Avatar
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    What hull and power are you running?

    I was wondering if it would benefit any boat, or just the faster boats that are barely sitting in the water at speed.
    I would think you'd have to be going pretty fast to run a pump out of water.

  11. #9
    Senior Member $uperJoe's Avatar
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    it was just one he was working on. a tunnel with what he estimated at 700 hp. it was just as we walked by i noticed it and asked. i will never run out of water as my lowly 350hp stock bbf will let me ride my 17ft V, wet from in front of my feet in the drivers seat. just looking to correctly understand terms and theories so i can keep up with conversations.

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    LP-25.com Infomaniac's Avatar
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    That is old technology. AKA a bubble. You want the water to flow into the intake all on it's own. Not forced in by a reaction. The spoon effect will change with speed. Hold a spoon under the faucet and change the water speed. No abrupt shapes anywhere should be the objective..
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  13. #11
    Senior Member $uperJoe's Avatar
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    well thats twice ive ran to the sink to look for a spoon. since there is variations at different speeds, and how its permanently set; that would make it hard to tune for specific HP and pump loading correct? this is why its "old tech"?

    is the other part about the intake angle correct? i do not see a flat surface where an angle could be taken off the bottom side

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    This post finally answered my first question. "what is that bubble thing in front of my intake?"

    My Boat is a 21' Centurion daycruiser. I think it is a splash of an Eliminator hull. Boat runs down the lake flat and handles wakeboard chop like a dream. Rides "wet", last 8 to 9 foot of the boat is in the water but I don't think that is a bad thing for my boat.

    I was looking to do a setback of the intake a few inches, like 7 or so to get the hand hole outside the boat, and free up 7" more inches of interior room by moving the motor back. After some reading I don't think that would be a great idea. The transom is 1.5" thick and I worry about weakening the rear of the boat. I need to get a few pictures up so I can get some more opinions.

    Boat runs down the lake 57MPH @ 5100 RPM on the GPS with the top up, 25 gallons of fuel and 3 people. I am doing a little bit of work to the pump this winter, new impeller and wear ring, HTP straight snoot, place diverter and a basic loader. One step at a time to make sure I don't screw something up.


    Hell of a first post.

  15. #13
    AKA OhOneWS6 Last Mohican's Avatar
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    It is called the Coanada effect.


  16. #14
    Senior Member ol guy's Avatar
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    The terminology for jet boat bottoms has changed so much it would be hard for anybody to keep up! Rocker, spoon, bubble are all the same thing! I don't even want to go into "hook" O.G.

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