I will now try to take you through the design of the trebuchet which has been shown in Part I of this post. This description that follows is actually aimed at showing you how in Blender all design is based on very simple starting points. The trebuchet frame is based on a single circle, the hole in which the main axis will eventually be placed, with a diameter of one Blender unit. Around this circle I based an octagon with the same center, but with a diameter of three.

The octagon is an arbitrary decision. I could have taken a septagon or a nonagon, but decided to go with eight vertices. It looks like this when appended to the circle above: Continue reading Trebuchet, or counterweight catapult, part II →