Javelin Tech TV

Part 1 Javelin Tech TV Trebuchet Challenge

If you’ve been watching Javelin Tech TV then you know that Scott Lidgey and I are planning to design and build a trebuchet and we encourage you to get involved too.  Watch today’s episode of Javelin Tech TV to see Scott’s initial design and how he uses the weldments feature of SolidWorks to create the frame.

If you want to take part in the Trebuchet Challenge and build your own trebuchet here are the parameters we are using.  Let us know how you’re doing either by commenting on our blog or send us a note to javelintv@javelin-tech.com and include some video of your chucking things.

The Rules

Here are the parameters we used to design our trebuchet.  I encourage you to build and fire your own trebuchet using these same parameters and send us the results (video would be great).  Beat us if you can (evil laugh).

  1. Built with 3D Printer (except sling and release pin). If you don’t have access to a 3D printer we feel sorry for you because they are really cool and there is no better way to make accurate engineering models. But you can still play along as long as you follow rule #2.
  2. Build envelope is the net build area of the Stratasys Objet30 Pro. Your total build volume must not exceed this envelope 294mm x 192.7mm x 148.6 mm (11.58in x 7.58in x 5.85in). View more detailed information on the capabilities of the Stratasys Objet30 Pro.
  3. Total mass of counter weight = 250g (basket + ballast)
  4. Trebuchet must be on the ground when firing. No you can’t put your trebuchet on a cliff and claim that your shot went 1,200 feet (laugh if you like but I know somebody was thinking of doing that).
  5. Target range must be approximately level. (see #4)
  6. Projectile is one standard/regulation golf ball.
  7. Total distance will be the distance from the most forward point of the trebuchet to where the projectile lands, not including any bounce or roll.
  8. Safety first. Please be careful not to injure yourself or anybody else and do not damage anybody’s property but your own.

If you’re looking for more motivation or inspiration here are some links that will give you some background on trebuchets and some resources to help you get started.

Nova Builds a Trebuchet Part 1 of 6

Several years ago I saw this program and first learned about the trebuchet.  Ever since I’ve wanted to make one because

  • They are an incredible application of engineering principles
  • You get to throw things really far
  • Trebuchet is a cool word

eHow How Does a Trebuchet Work?

A video with a simple explanation of how and trebuchet works.

Wikipedia – Trebuchet

Review of the history of the trebuchet.

Rich English Guy and his Trebuchet (flaming pianos and cars)

The title says it all.  If you’ve got a big trebuchet you might as well use it to throw flaming pianos, right?

Thingiverse – Trebuchet

On Thingiverse you can download all kinds of CAD designs including many trebuchet models. This is a great place to get you started on your trebuchet design.

Good luck and let us know how your trebuchet project is coming along.

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