Cardboard Boat Regatta

Discussion in 'Boat Design' started by william phillips, Mar 21, 2019.

  1. william phillips
    Joined: Mar 2019
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    Location: united states

    william phillips New Member

    My school is hosting a regatta in which we need to make boats out of cardboard. Pur group wants to find a good design for a simple, stable, and efficient boat. Most of the pictures we find online of cardboard boats just look like boxes. Any ideas on what designs could help us win?
     
  2. JamesG123
    Joined: Mar 2015
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    Location: Columbus, GA

    JamesG123 Senior Member

    Which would be one or more boxes taped together.

    If you want it to look more "boat like", you will need to first turn your material (courgated cardboard boxes) into something more like what "real" boats are traditionally made of (wood planks and plywood). Since compound curves add complication, you should flatten out your boxes and then laminated them together with a water-proof glue, 3 or 4 layers thick, staggering the joints and where ever a bend crease was between pieces of cardboard. What you are doing is creating your own plywood. Then you can follow just about any plywood dory plans, keeping in mind that your sheets are going to be about twice as thick as the plywood the plan calls for.
     
  3. Mr Efficiency
    Joined: Oct 2010
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    Mr Efficiency Senior Member

    Catamaran ! use some cardboard cylinders, like what fabric is rolled onto, to connect the two hulls.
     
  4. Angélique
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    Angélique aka Angel (only by name)

    kerosene likes this.
  5. Angélique
    Joined: Feb 2009
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    Location: Belgium ⇄ The Netherlands

    Angélique aka Angel (only by name)

    Usually the more and the better the info is which you give about your needs in your questions, the better the answers will be.

    • How many crew do you want to have in the boat ?
    • What is their average weight ?
    • What kind of propulsion are you thinking of ?
    • For flat water or rough water ?
    • What kind of course need to be sailed, and over what distance ?
    • Indoor or outdoor, can there wind be expected ?
     
  6. BlueBell
    Joined: May 2017
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    Location: Victoria BC Canada

    BlueBell Ahhhhh...

    Having won a few of these events I can tell you monohulls are hugely successful and kayak style paddling is the way to go.

    The most important thing is the rules. What are they?
     
  7. william phillips
    Joined: Mar 2019
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    william phillips New Member

    • 4 people per boat
    • between 90-110 pounds
    • We will be using oars for propulsion
    • Flat water
    • We need to get across a pool quickly and efficiently
    • indoor, no wind
     
  8. Angélique
    Joined: Feb 2009
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    Location: Belgium ⇄ The Netherlands

    Angélique aka Angel (only by name)

    Trimaran, one central tube Ø 24" (0.61 m) × L 24' (7.32 m)*, two outriggers Ø 24" (0.61 m) × L ± 20' (6.10 m), five Ø 24" (0.61 m) cross beam tubes on top lashed with rope and/or duct tape to the longitudinal tubes, all tube ends closed with heavy solid cardboard cones and duct tape, paddlers sitting over the central tube between the cross beams, legs clamping around the central tube and and feet in the water, kayak style paddling.

    * or the max allowed length if 24' (7.32 m) is to long, and about 20' (6.10 m) beam, or whatever max beam is allowed.

    Tube end cones, cut out the dashed line in the first pic and pull the remaining part together (the text in the below pic is Dutch).
    [​IMG] [​IMG]

    Heavy-duty cardboard Concrete Form Tubes, they're normally used as forms to make concrete pillars.

    Minimum Order Quantity: 25 Pieces (work a day or two with your buddies for a contractor that uses them, and get some for free)
    Maximum Inside Diameter: 24"
    Common Inside Diameters: 6", 8", 10", 12", 14", 16", 18", 20", 24"
    Common Lengths: 4 Foot, 8 Foot, 12 Foot, 24 Foot
    Maximum Length: Any

    [​IMG]
     
    Last edited: Mar 21, 2019
  9. Angélique
    Joined: Feb 2009
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    Location: Belgium ⇄ The Netherlands

    Angélique aka Angel (only by name)

    Meant single blade kayak paddles there, not the double ones.

    [​IMG]

    [​IMG]



    Don't have to switch sides, with a crew of four there are two paddlers for the left side, and two for the right side.

    paddlers
    L
    R​
    L
    R​
     
  10. JamesG123
    Joined: Mar 2015
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    Location: Columbus, GA

    JamesG123 Senior Member

    Boat has a minimum empty weight of 90 lbs.?

    I'd pick something like a rowing skeg or short "dragon boat". Long, narrow, with minimum freeboard.
     

  11. Angélique
    Joined: Feb 2009
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    Location: Belgium ⇄ The Netherlands

    Angélique aka Angel (only by name)

    The post #5 question was:
    ‘‘ • How many crew do you want to have in the boat ? ’’
    ‘‘ • What is their average weight ? ’’

    The post #7 answer (with a quote of the question) was:
    ‘‘ • 4 people per boat ’’
    ‘‘ • between 90-110 pounds ’’
    so that's the average weight per crew member.
     
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