Torsion Onager 175+ Yards

Introduction: Torsion Onager 175+ Yards

     I am a 8th grader and I built this onager for my science fair project.  All the metal was laser cut at my dad's work.  It took about two weeks to build, just because of all the trips we made.  This compact machine launches a golf ball over 175 yards.  I am working on a better trigger system now and looking for a crank so we can go over 40 pounds of force. I am hoping to get a video up soon.

Make-to-Learn Youth Contest

Participated in the
Make-to-Learn Youth Contest

Be the First to Share

    Recommendations

    • Make it Glow Contest

      Make it Glow Contest
    • First Time Author Contest

      First Time Author Contest
    • Anything Goes Contest

      Anything Goes Contest

    7 Discussions

    0
    andreyeurope
    andreyeurope

    7 years ago on Introduction

    How actually did you do it ? Or isn't your creation, is it ?

    0
    Alex and Joey Productions
    Alex and Joey Productions

    Reply 7 years ago on Introduction

    I drew up a gear system on a CAD system and cut them out of metal at my dad's work. then I built the wood parts around it

    0
    Alex and Joey Productions
    Alex and Joey Productions

    Reply 7 years ago on Introduction

    I drew up a gear system on a CAD system and cut them out of metal at my dad's work. then I built the wood parts around it

    rjnerd- The sling i used is 2 feet long. the rope is 3/8 in. diameter. the rope was tightened by turning a nut with a ratchet on the small gear.

    0
    rjnerd
    rjnerd

    7 years ago on Introduction

    Looks great! What range of sling lengths have you tried? What diameter and material are you using in the bundle? Did you pre-tension the bundle when you laid it up?