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  1. #1
    Norwegian Wiking Trond's Avatar
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    Trond The Wiking's RXP/V-Hull boat project

    This will be a project for me next winter 2009/2010, but I'll start the preparation very soon.

    I'm gonna build a 11ft v-hull boat with mostly rxp parts, engine, pump etc.
    Me and my father are gonna mold the hull... My father worked as a boatbuilder in his early years, running his own buisness

    This is a pic of a similar boat...



    These boats does 65mph with a 70hp outbord engine. The hull has a nice shape and handles speed and rough sea very well. These boats has been raced with...
    We'll make it 1ft lower, cutting it right abowe the line going along the hull, and that will also make it 1 ft shorter (from 12-11ft). We'll make a deck and a windscreen... It will be a super lightweight boat! The total weight will hopefully be around 450-500pounds...

    The engine and pump will come from my rxp... Turbocharged and 300-320hp. The goal for this setup is a fun small lightweight boat with brutal acceleration and topend around 85-90mph.

    Pwc's are still illegal in all Norway, and that's partly one of the reasons I'm parting out my RXP and using it for this build.

    So...

    Some questions...

    What does a complete rxp engine weigh?
    I was thinking of removing the rideplate and move the engine as far back as possible, mounting the pump to the rear of the hull. This will position the intake grate at the very end of the hull and it'll give me a nice weight balance. How will this work? Should I rather keep the rideplate? How is it done on the fastest jet-boats?

    Any thoughs are welcome

    Thanks
    Last edited by Trond; 02-25-2010 at 04:13 AM.


  2. #2
    Moderator beerdart's Avatar
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    You go boy!!! The RXP motor is around 225lbs..

  3. #3
    You can do it!!!
    Excellent project!

  4. #4
    Norwegian Wiking Trond's Avatar
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    225lb... That should make it possible to get the total weight around 450lbs. I have actually build one of these in the past, but with an 40hp outboard at that time... The weight was 170lbs + engine.

    Has anybody got any ideas about the rideplate issue?


    This is a picture of what it could look like, exept for this is a winrace 12..
    Last edited by Trond; 09-21-2011 at 04:57 AM.

  5. #5
    fabrication guru rapidacceleration's Avatar
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    rideplate??? do you mean cooling the motor??
    go openloop cooling. the kits in the store

    are you still going to have a jetpump right?

  6. #6
    Quote Originally Posted by Trond View Post
    225lb... That should make it possible to get the total weight around 450lbs. I have actually build one of these in the past, but with an 40hp outboard at that time... The weight was 170lbs + engine.

    Has anybody got any ideas about the rideplate issue?


    This is a picture of what it could look like, exept for this is an winrace 12..
    Man, I love that boat...I would like to have one

  7. #7
    Norwegian Wiking Trond's Avatar
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    Quote Originally Posted by rapidacceleration View Post
    rideplate??? do you mean cooling the motor??
    go openloop cooling. the kits in the store

    are you still going to have a jetpump right?
    No I dont mean cooling the engine...I'll find a way to cool it...

    But if i keep the rideplate, and bolt the pump to the very rear of the hull, then the rideplate will be sticking out behind the hull. I was thinkin of completly removing the rideplate... Then the intakegrate will be at the very end of the hull. Now there will be a longer distance between the piont where the water leaves the hull and the exit nozzle. Will this cause any problems?

  8. #8
    jtskir15f's Avatar
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    u mean having the pump stick completely out the back? it would look similar to this or an arneson drive
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  9. #9
    Norwegian Wiking Trond's Avatar
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    Let it stick completely out yes!! Any problems of doing this? Where can I find pics of jetboats like the ones going up rivers in an insane speed ??

  10. #10
    Norwegian Wiking Trond's Avatar
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    In this pic you can se a rideplate... Is it a must? Gains?

    Or can I just skip that part....



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