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Catapult Design Help

Discussion in 'Sports, Hobbies & Interests' started by topgun155, Oct 11, 2009.

  1. Oct 11, 2009 at 8:12 PM
    #1
    topgun155

    topgun155 [OP] Well-Known Member

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    I need some help with the design of a catapult for a school project if any one has any experience or advice on one. There are only a couple of rules: can be 50cm x 50cm x 100cm max, must be gravity powered, and must have a remote trigger. I think it needs to throw about 30yds accuratly. I also need it to be pretty simple to build because I don't have a lot of time.
    Thanks
     
  2. Oct 11, 2009 at 8:17 PM
    #2
    WATRD

    WATRD Keyser Soze

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    Check out my site, it's mostly up to date and there's too much to list here.
    The "gravity powered" aspect of this is the "gotcha". I have built a bunch, usually a LOT bigger than that. ;) Because of that gotcha, you are going to need to go with one of the counter-weighted designs. Fortunately for you, there's plenty of plans online. The remote trigger is usually just a length of rope to release it. Think of a teeter-totter type design...

    Have fun. This is a great project.
     
  3. Oct 11, 2009 at 8:21 PM
    #3
    WATRD

    WATRD Keyser Soze

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    Check out my site, it's mostly up to date and there's too much to list here.
  4. Oct 11, 2009 at 8:22 PM
    #4
    topgun155

    topgun155 [OP] Well-Known Member

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    I think I know what I am going to build, But I am kinda looking for some tips. One thing I would really like to know is where to place the hole in the arm for the pivot. what ratio five you the best distance.
     
  5. Oct 11, 2009 at 8:22 PM
    #5
    WhatThePho?

    WhatThePho? Greg Graffin 2016

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    Where is Chris 4x4 when you need him...
     
  6. Oct 11, 2009 at 8:24 PM
    #6
    WATRD

    WATRD Keyser Soze

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  7. Oct 11, 2009 at 8:25 PM
    #7
    fletch aka

    fletch aka www.BeLikeBrit.org

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    I thought that too, than I thought he might use it to take out California. :eek:
     
  8. Oct 11, 2009 at 8:29 PM
    #8
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    LOL!

    Actually, WATRD covered it...
     
  9. Oct 11, 2009 at 9:00 PM
    #9
    WATRD

    WATRD Keyser Soze

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    Check out my site, it's mostly up to date and there's too much to list here.
    I figured you couldn't really be on here 24x7 like they say... so I could pinch-hit until you arrived ;)

    It's all yours from here...
     
  10. Oct 11, 2009 at 9:16 PM
    #10
    topgun155

    topgun155 [OP] Well-Known Member

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  11. Oct 11, 2009 at 9:18 PM
    #11
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    You hit it with the trebuchet. Though, given the size limits, Im not sure it will throw an object the required distance. :confused:
     
  12. Oct 11, 2009 at 9:22 PM
    #12
    lookylookitzadam

    lookylookitzadam Retrofit Club!

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    Definitely build a trebuchet. Takes some calibration and adjusting to get it to release at the right time, but when you do, its dead on accurate and gets good distance.
     
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