|Project by bch||posted 02-13-2011 08:38 PM||9908 views||5 times favorited||4 comments|
Building castles from toy blocks is only half the fun. Every child needs some siege weapons to then breach the enemy compound. Hence my first siege weapon. It throws a foam wine cork cut in half about 15-20 feet and knocks down blocks nicely. My son has a great deal of fun playing with it (when he can get it away from me—I’ve played with it a bit, too).
This is not my plan. I got this from a book at the library (http://www.amazon.com/Art-Catapult-Ballistae-Trebuchets-Artillery/dp/1556525265/ref=sr_1_1?s=books&ie=UTF8&qid=1297618166&sr=1-1). While it is intended for the junior-high or high-school age, it is a great read even for adults. I really enjoyed the history behind these designs. This is a roman design they called Wild Donkey which was credited with defeating an impenetrable enemy stronghold.
Not owning a lathe I was unable to turn a proper basket to hold the projectile. But after seeing Mafe, if I recall, turn on his drill press… I’ll have to get some turning tools and return to finish this properly.
P1: The Catapult
P2: This is the release mechanism I devised. It is a paperclip bent to be a hook, on a picture-frame eye-screw, with a string tied to it such that a pull on the string 90 degrees to the right releases the hook. You can almost see how I did the wheels. I cut discs from a dowel, drilled holes for the 1/4” dowels, and pinned them with toothpicks. It’s not top-notch woodworking, but I thought the design suited this project well.
P3: Here you can see the action. This is twisted rope, or torsion.