Underwater Programming Laboratories

My First Trebuchet

Height: 112 mm
Length: 155 mm
Depth: 52 mm, (175mm including supports)
Arm Length: 115 mm / 55 mm
Arm Ratio: 2.1:1
Sling Length: 110 mm
Counter Weight: 120 g (lead shot)
Counter Weight Drop: 94 mm
Projectile: 1/4 inch nut / jelly beans, 2 g
Weight Ratio: 60:1
Range: 9 feet

Counter Weight Projectile Weight Weight Drop Theoretical Max Throw Actual Max Throw Efficiency
120 g 2 g 94 mm 222 inches 108 inches 49%

This is my first attemp at a trebuchet. I got the plans for this little guy at My desktop trebuchet experiment. I followed the plans for the most part but messed up with the counter weight. It was supposed to be hinged but I attached it as a fixed by accident.
Here you can see it in the cocked position with a 1/4 inch hex nut as amunition. No sling is used for the nut. The line is fastened to the nut and slips over the pin.
The left image show a better view of the payload chute. On the right a view of the trebuchet in the released position.
I made this sling out of fishing line with the help from Ripcord's site. Works great for throwing jelly beans.

WARNING! Trebuchets contain fast moving parts that can whack you silly if you get too close when firing. Care should be taken when using and device to hurl objects to make sure that the safety of persons and property are considered before constructing or using such devices. These pages are provided for the display of my accomplishments and not as instruction on how to safely build or operate a hurling device.
Always use under adult supervision.

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