Trebuchet! Yea those are fun.
I decided to make a trebuchet just for the fun of it. I wanted something that I could use in the back yard so I said it can be no taller then 2'. It took me about forty five minutes to put together, and it works great. It will launch a 6oz socket about 50 feet. I will have to work on accuracy and distances as I get to play with it. I would like to make a chart with distances with different settings and weights of projectiles. If you want to come over for a party some time I might just break it out for you.
