g.w. invader mini jet boat
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g.w. invader mini jet boat

  1. #1
    Senior Member ub3r l33t dud3's Avatar
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    Default g.w. invader mini jet boat

    ok so im starting a thread for my mini jet boat.

    here are some quick specs:
    g.w. invader 10' hull (not sure what year)
    800cc Suzuki rated at 60hp
    matching pump with aftermarket nozzle and bowl

    i bought the boat about a month and a half ago with some carb problems. it came with the trailer and it was cheep so no complaints there. the wiring is a mess and it needs alot of fiberglass work. the guy i bought it from took it for a trade and he said the guy before him was trying to sell it for a while. im not sure who built it but it wasn't ether of those two lol.
    when i got it running and into the water it was porpoising uncontrollably. we put a temporary foil under the jet and that has stopped it but i need to make permanent ones. just about everything on the boat needs some finishing touches.
    it looks like the person who built this boat never finished it (probably because of the porpoising), the structural modifications to fit the new motor and pump are great so im pleased with the boat.

    here are a few pictures of the boat

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  3. #2
    Senior Member LIL WAKE's Avatar
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    When you get back from riding post more pics for us!! I would like to see the motor, pump and how everything is rigged up! Very cool boat! What is the suzuki motor out of, and did you do the conversion or did the past owner?

    1988 Addictor 333 powered by Seadoo 787cc Rotax (110hp)

  4. #3
    JWT
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    40 years ago when those were "new" I thought they were so cool. Usually guys would put a 40 or 50 hp outboard on them and what a blast to drive. I can't imagine with a 60hp jet. Post some more pics!

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  6. #4
    Senior Member ub3r l33t dud3's Avatar
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    it is a blast to drive!
    and no i did not do the conversion. im not sure who did but it wasn't the guy i bought it from or the owner before him. it is done pretty well aside from the jet is angled up just slightly. i can show you how he did it though. the motor is out of an old funjet im pretty sure. same engine as a wetbike, jetstar, or funjet. the motor sits on top of the jet instead of in front which makes it alot shorter, but the weight is spreed out less (a steep price to pay on a 10' boat). i made a foil to get the boat to stop porpoising from the extra weight.

    on the bottom of the boat there is a seam where two panels meet that is causing cavitation so it will not suck up water at high speeds so it will only do a very slow 25mph, once i smooth that out it should go pretty quick. and i need different trim tabs.

    here are some picks of the foil i made as well as the seam on the underside of the boat i was talking about

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    here are some driven around pictures

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    i took pictures today but im having trouble putting them on my computer, il put them on here tomaro

  7. #5
    Senior Member LIL WAKE's Avatar
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    So cool, but I blaming your issue 100% on that obtrusion on the bottom. The pad in front of the pump needs to be perfect/smooth/seamless and with that seam being SO close in front of the pump that could be detrimental to performance. Cant wait to see what all you do to it! Very cool boat!!

    1988 Addictor 333 powered by Seadoo 787cc Rotax (110hp)

  8. #6
    Senior Member ub3r l33t dud3's Avatar
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    yea that is an odd design lol. there has to be a joint there but there is no reason it needs to be that big!! that hopefully shouldn't be to hard to smooth out. i have some water getting in between the floor and the hull that i have to remove. the floor isnt sealed so that's one repair i have to make.

    your design is different for your pump mounting so you wont have as much of a problem with the waterline in the back as me. the whole space around the pump isn't offering any buoyancy so it sits pretty low in the back. il take some pictures tomorrow of how my pump is mounted.

  9. #7
    Senior Member ub3r l33t dud3's Avatar
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    ok i went out and took some pictures this morning. here is what i got


    this is how the pump and motor are attached to the hull... sorry, there is no easy way to explain this lol... the motor sits ontop of the hull and the pump sits below the hull which basically sandwiches the hull in-between the two. since the whole pump sits below the hull it has to be raised and that is why there is a tunnel . the plate on the bottom of the pump is to fill the space where there is no hull around the pump (just to make it hydro dynamic) the crank shaft is vertical like on an outboard and goes down into a built in gear box on the front of the pump.

    pictures of the "tunnel" that the pump sits in

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    here is a picture of under the bow of the boat, just a gas-tank. the floor panel that has all the water around it is going to be cut out and replaced

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    and here are just some closer pictures of the inside and engine

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  10. #8
    Senior Member bartel's Avatar
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    I like it. You def need to do something to the bottom of that guy. it is easy to see why you are only getting 25 mph. just take some body filler and mold a new transition fromhull to pump intake. at least you will know if that will work or not.

    if it cleans up how the boat runs at speed then you could look for a more permanite fix
    2006 22ft Placecraft 496 Mag

  11. #9
    Senior Member ub3r l33t dud3's Avatar
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    i agree. i ment to do that yesterday but i completely forgot. next time i take it out i will do that for sure.

    i just cut that panel out of the floor and here is what i found,

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    i already have the water out and the inch of sand too lol

    p.s. i just realized that the gap in-between the hull and the plate on the bottom of the pump is causing a low pressure area and since the pump cavity is filled with air it can pull air through the gap and under the boat right in from of the intake. long story short it is sucking air from through that gap.
    Last edited by ub3r l33t dud3; 09-26-2012 at 01:01 PM.

  12. #10
    Senior Member bartel's Avatar
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    you will probably pick up 10mph just by emptying the water out of that thing. Try to seal everything and make the bottom as smooth as possible. no big seams or air pockets.

    We are going to be planning a mini boat meet next season so you have the whole winter for testing and tuning.

    now get to work. lol
    2006 22ft Placecraft 496 Mag

  13. #11
    Senior Member LIL WAKE's Avatar
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    Quote Originally Posted by bartel View Post
    you will probably pick up 10mph just by emptying the water out of that thing. Try to seal everything and make the bottom as smooth as possible. no big seams or air pockets.

    We are going to be planning a mini boat meet next season so you have the whole winter for testing and tuning.

    now get to work. lol

    1988 Addictor 333 powered by Seadoo 787cc Rotax (110hp)

  14. #12
    Senior Member ub3r l33t dud3's Avatar
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    lol ok. and i guessed at about 1.5 gallons of water under the floor. but compared to the water i cant pump out that's nothing. because that tunnel is there the water on one side cant get to the bilge pump on the other side so i have to get another pump. no worries though il have it all fixed this spring.

    i just got done working on our 16ft tow boat. me and my friend picked up the boat and a motor for free so that has been taking up some of my time.

  15. #13
    Senior Member ub3r l33t dud3's Avatar
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    ok quick to do list before i pass out.

    wiring:
    turn on fuel pump by key
    dedicated power wires for bilge pump
    install wires for tach gauge
    maybe install master battery switch

    fiberglass:
    patch floor
    remove fiberglass "seat" bottom
    patch crack in top hull
    repair holes on bottom of hull
    fill in gap between hull and intake plate

    misc:
    make trimtabs
    make seat bottom and sides
    make foot throttle
    reposition switches and gauges
    maybe a paint job





    anything i forgot?
    any ideas on a paint job?

  16. #14
    Senior Member ub3r l33t dud3's Avatar
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    LIL WAKE these pics are for you,

    here are pictures of how my throttle works.

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    the steering is cable also and it is set up the same way
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    Last edited by ub3r l33t dud3; 09-28-2012 at 09:36 AM. Reason: resize pics

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