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Cardboard Boat Project

Discussion in 'Off-Topic Discussion' started by tacomathunder, Feb 3, 2010.

  1. Feb 3, 2010 at 2:36 PM
    #1
    tacomathunder

    tacomathunder [OP] Well-Known Member

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    Hey guys, for my physics class I have to make a cardboard boat that is able to support 2 people. The rules are i can only use cardboard from boxes, and regular clear packing tape. I and my teammate must navigate the boat from one end of the pool back to the start.... Any tips or suggestions, or heck, even designs to help me out?:eek::confused:
     
  2. Feb 3, 2010 at 2:37 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Thor

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    Use alot of tape.
     
  3. Feb 3, 2010 at 2:39 PM
    #3
    headhunter247

    headhunter247 Well-Known Member

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    are you allowed to paint it? if so, get some outdoor type paint, that could help..
     
  4. Feb 3, 2010 at 2:39 PM
    #4
    Timicha

    Timicha Timicha

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    use the shiny cardboard that have the pictures and stuff on it so that it repels the water a little more than the normal brown cardboard thats just gonna soak it up like a sponge, and lots of tape like chris said
     
  5. Feb 3, 2010 at 2:39 PM
    #5
    08pretaco

    08pretaco Almost there

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    ya tape up the whole bottom of the hull, inside and out. then layer another "sheet" of it on top and use more tape

    also for the bottom try to use a pretty generous surface area

    oh and lose weight :D haha jk
     
  6. Feb 3, 2010 at 2:41 PM
    #6
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Thor

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    Make alot of "Stringers" on the inside "Hull" of the Boat. Reinforce the structure to handle the weight. Personally, try to build a large Pontoon design.
     
  7. Feb 3, 2010 at 2:46 PM
    #7
    Toyota Truck

    Toyota Truck Well-Known Member

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    This...and go to your local grocery store and head to the produce dept. ask them if they have any cardboard boxes with wax on them like the apple boxes. pineapple, etc.
     
  8. Feb 3, 2010 at 2:46 PM
    #8
    mjp2

    mjp2 Living vicariously though myself Thor

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    As a start, figure out how much water you and your teammate (plus oars, etc.) will displace. That'll give you the absolutely minimum volume needed for the hull. Add a bit extra to avoid having water come over the top and start figuring out dimensions from there.
     
  9. Feb 3, 2010 at 2:50 PM
    #9
    wareagle5693

    wareagle5693 Well-Known Member

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    :laugh: x2!
     
  10. Feb 3, 2010 at 2:57 PM
    #10
    bigburrito

    bigburrito Local Man

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    id say look into designs of birch bark canoes. use rolled cardboard for thwarts and to reinforce the keel. the stronger your boat is torsionally the faster you will be able to paddle it, and you should be able to make it down and back before it starts getting too waterlogged (and sinks)

    i would also recommend adding some kind of skeg/rudder to aid in stability. something like what you would see on a surfboard
     
  11. Feb 3, 2010 at 2:57 PM
    #11
    topgun155

    topgun155 Well-Known Member

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    X2
    I think they are hard to find, but piano boxes are super think and float when wet.
     
  12. Feb 3, 2010 at 3:00 PM
    #12
    bigburrito

    bigburrito Local Man

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    or you could go the tom sawyer/ huck finn route and roll up a shit ton of cardboard and make yourselves a raft.

    is this event being timed as part of the competition?
     
  13. Feb 3, 2010 at 3:06 PM
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    topgun155

    topgun155 Well-Known Member

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  14. Feb 3, 2010 at 3:09 PM
    #14
    ryanjboutin

    ryanjboutin Mob dirt parking lots.

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    Spacers. Spacers everywhere.
    I'd recommend running an iron over the tape, with a towel in between, so that you reduce air bubbles and promote adhesion to the cardboard surface, kinda like hot laminating.
     
  15. Feb 3, 2010 at 3:23 PM
    #15
    Jason'sLawnCare

    Jason'sLawnCare Prepared for Bambi

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    Pickup a used yamaha 90hp 2 stroke for power. Make the hull so thick that if you sink you'll hit the bottom before you really sink.

    In all seriousness though I think the tape in alternating directions is a good idea.
     
  16. Feb 3, 2010 at 3:32 PM
    #16
    kilo

    kilo Solo Member

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  17. Feb 3, 2010 at 3:36 PM
    #17
    08pretaco

    08pretaco Almost there

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    treat it like a composite with using fibers as cardboard and resin the tape
     
  18. Feb 3, 2010 at 3:42 PM
    #18
    usmcgoose

    usmcgoose One shot is all I need

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    This is actually a popular project. Many have been done before...one was even made to carry a trolling motor. you can find a lot of information on line.

    I would build it row boat like. Make the bottom into a series of tubes (square is fine) and cover with tape. Link them together and build the sides. This way, you're relying more on the air pockets than the cardboard itself. The key is a good seal with tape. Recommend at least 2 layers.
     
  19. Feb 3, 2010 at 4:01 PM
    #19
    Phlip4x4Sport

    Phlip4x4Sport Well-Known Member

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    I recommend you use an refridgerator shipping box, 5 ply and plenty of strength for the outer shell. Fold the corners in like origami instead of cutting out the excess material.

    Then create solid formers or bulkheads to give it shape. Flat bottom for stability, like a "jon boat". You don't need speed, pointy front or rounded sides for waves.

    For the bulkheads, do what they say and make plywood by using multiple sheets with varying directions to the "grain" of the cardboard.
     
  20. Feb 3, 2010 at 4:12 PM
    #20
    paulm09tacoma

    paulm09tacoma Well-Known Member

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    bigger the better. objects float due to water displacement. so go big. and lots of tape.
     
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