On and off for the past three weeks, me and my family have been to our summer house in the High Coast in Sweden (It's about a 40-50min drive from where we live) and I've begun building my third trebuchet.
(A trebuchet is a kind of catapult which uses a counterweight)
This is the current state:
I got permission from my grandfather to cut trees to build with. So far I've only been using wood I've felled myself. Most of it will be Picea abies (Norwegian spruce or Gran in Swedish, http://en.wikipedia.org/wiki/Picea_abies)
It's about two meters across, 3 - 4 meters long and when the beam is still it will be about 4.5 meters tall. Currently the frame is about 2.5 meters high.
Some pictures from the past weeks:
You can see the second trebuchet I built in this picture.
The bucket for the counterweight stones is going to be about 90*90*90cm, but I'm still not sure as to how I will design it, since it would need to take quite alot of stress.
Also, the bucket on this trebuchet will not be directly connected to the beam, but it will have a smaller axle (Is this the right word?) between it and the beam. This is to allow the bucket to fall straighter.
This is how the beam will look: (The one closest to the camera)
I will be continuing this build on wednesday. I don't think I will be able to finish all of it this summer. Since this is the only free week I have left. After this one I'm going to the World Scout Jamboree for two weeks, then I'll work for one week and then school starts.