Build a scale model trebuchet catapault

Throws a 25g rock about 100 metres. Counterweight is 13Kg of lead. For small scale models a high density material like lead is needed. As the model scales up, less dense materials like earth, rock and water can be used (double the scale = 2x2x2=8 times the weight in the same scale volume).

Useful links:

http://www.algobeautytreb.com/     - Simulation program. Much easier than building something and finding it doesn't work.

http://www.trebuchet.com/   - great designs, lots of pictures

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