The Modified Ogre Catapult

My name is Mark, and my friend Thomas and I needed to build a catapult that weighed less than 2 kg and would throw an egg more than 8 meters for our science class.  Last year we built a version of your huge Wyvern torsion catapult and it was a smashing success.
 Unfortunately that catapult was much much much too heavy to work again this year, so we had to start from a new design, and that design was your Backyard Ogre.  To add more power however, we made a couple alterations, and to share these is the reason I'm emailing you today.  For ours, we made all of the components from 1" square bars of varying lengths instead of your 2 by 3's.  Pressure treated lumber was strong and light enough to hold together at this smaller size.

 We also added support struts out of wood instead of inset wood, for simplicitys sake.  For the power, we took your original ideas and expanded 4 fold.  We used 4 18" bungees attached to two different eye holes on both sides of the swing arm.  Other adaptations include a different hinge mechanism, which will be pictured, a simpler bungee securing system, a PVC friction reducer, and a 39" swing arm.  With these changes, our catapult threw the egg a record breaking 26 meters!  

When I took it home and was throwing full water balloons, I was able to eke out 60 feet maximum throws.  I will attach multiple scaled pictures that you could post to help others replicate our results.  If anything remains unclear, please email me back, and I would be happy to explain anything. Thanks for all your help!

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Table of Contents for this tutorial

BACK TO THE CATAPULT MAIN PAGE

1. Make the Table Top Troll Catapult Home and materials requred
2. Begin assembly of the sides and base
3. Assemble the catapult firing arm
4. Complete the assemblly and finish by painting
5. Video of this catapult firing
6. Books/Medieval store
7. DVD's Documentaries about siege engines
8. Free Catapult Plan

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