VSV LDL design

Discussion in 'Boat Design' started by Forecaddie, Apr 12, 2023.

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  1. Forecaddie
    Joined: Apr 2023
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    Location: Brisbane Australia

    Forecaddie Junior Member

    Looking at building a Very Slender Vessel with Low Displacement Length of about 24-30 foot boat using a maximum 4HP outboard or motor for commuting 4nM. Live in Australia where you don’t need to register a boat under 4HP. Looking at maximum speed and 4-6 foot wide. Made with stitch and glue 5mm thick marine ply. Any thoughts?
     
    Forecaddie, Apr 12, 2023
    #1
  2. BMcF
    Joined: Mar 2007
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    Location: Maryland

    BMcF Senior Member

    A look at the designs from N. G. Herreshof would be a good place to start. Lots of them have been made available on line.
     
    BMcF, Apr 12, 2023
    #2
  3. HJS
    Joined: Nov 2008
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    Location: 59 45 51 N 019 02 15 E

    HJS Member

    A very interesting project. A first calculation gives 7.3/6.7 x 1.5/1.2 maximum total weight 500 kg, 4 hp, 10.0 knots. That is, it is a semi-planing boat and must be designed as such.
    Personally, I would start with the experience I have gathered with my boats with a trapezoidal bottom.
    JS
    MarySmart.jpg
     
    HJS, Apr 12, 2023
    #3
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  4. Forecaddie
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    Forecaddie Junior Member

    Thank you
     
    Forecaddie, Apr 12, 2023
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  5. Forecaddie
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    Forecaddie Junior Member

    Thank you
     
    Forecaddie, Apr 12, 2023
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  6. HJS
    Joined: Nov 2008
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    Location: 59 45 51 N 019 02 15 E

    HJS Member


    JS
     
    HJS, Apr 12, 2023
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  7. fallguy
    Joined: Dec 2016
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    fallguy Senior Member

    Main thing is what JS says, that won't be a planing hull.

    And the trickier bit is making sure the CoM and CoB line up or the boat will have a trim issue which you can defeat with weight in a light craft, but at the expense of speed and payload. Speaking from experience; not expertise.
     
    fallguy, Apr 12, 2023
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  8. bajansailor
    Joined: Oct 2007
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    Location: Barbados

    bajansailor Marine Surveyor

    The SASS Design Keyhaven Skiff does look like it would fit your needs admirably.
    http://sassdesign.net/Keyhaven Skiff, a semiplaning lightweight skiff.pdf

    I don't think you necessarily need to have a boat in the 24' - 30' range for commuting (in sheltered water?), if a smaller / lighter / cheaper boat will do the job.
    Will the boat be used on the Brisbane River, and kept in the water when not in use?
     
    bajansailor, Apr 12, 2023
    #8
  9. Forecaddie
    Joined: Apr 2023
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    Forecaddie Junior Member

    Nice video
     
    Forecaddie, Apr 12, 2023
    #9
  10. HJS
    Joined: Nov 2008
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    Location: 59 45 51 N 019 02 15 E

    HJS Member

    Keyhaven Skiff is the smallest I recommend. A larger boat is currently being built based on the same concept.
    JS
    Hp Speed jpg.jpg

    ​
     

    Attached Files:

    Last edited: Apr 12, 2023
    HJS, Apr 12, 2023
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  11. bajansailor
    Joined: Oct 2007
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    Location: Barbados

    bajansailor Marine Surveyor

    "Commute from Southern Morten Bay Islands to Redland Bay. Also, to bring groceries and jerrycans of petrol back. And sometimes 4 people."

    What would be the maximum typical weight of groceries and petrol jerrycans you would have to carry on each trip?
    Re the cargo capacity, would it be for 4 people plus the groceries and petrol?

    Looks like reasonably sheltered waters - here is a Google map of the area. Might be a wee bit choppy if the wind is in the northeast, or not really?
    Google Maps https://www.google.com/maps/@-27.6368298,153.3559598,12.5z

    And the same area on Marinetraffic :
    MarineTraffic: Global Ship Tracking Intelligence | AIS Marine Traffic https://www.marinetraffic.com/en/ais/home/centerx:153.310/centery:-27.628/zoom:13
     
    bajansailor, Apr 12, 2023
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  12. Forecaddie
    Joined: Apr 2023
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    Forecaddie Junior Member


    That’s exactly the type of boat! Are you building it?!


    ​
     
    Forecaddie, Apr 12, 2023
    #12
  13. Forecaddie
    Joined: Apr 2023
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    Forecaddie Junior Member

    Mainly 2 people with cargo. The occasional time to pickup friends from mainland. Yeah, need to weigh the cans.
     
    Forecaddie, Apr 12, 2023
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  14. HJS
    Joined: Nov 2008
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    Location: 59 45 51 N 019 02 15 E

    HJS Member

    upload_2023-4-13_10-15-59.jpeg
     
    HJS, Apr 13, 2023
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  16. Forecaddie
    Joined: Apr 2023
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    Location: Brisbane Australia

    Forecaddie Junior Member

    Also looking at a
    i think i found the type of boat Design I am looking for with modifications for a pilot house type look
     

    Attached Files:

    Forecaddie, Apr 13, 2023
    #15
    BlueBell and Paul Scott like this.
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