This is a medieval era siege weapon, known as trebuchet, capable of hurling different objects with great distances. It is a well-documented wooden, hanging counterweight trebuchet that will be bolted together from several self-designed and self-constructed components that reach a length of about 6 feet. This strategy will allow easily fixing of broken sections of the device as well as providing some degree of siege mobility. This large scale floating arm trebuchet is shown in the below image.
A SketchUp program is used to design the long end of the base where each long end of the rectangular base is identical and will be built two times. To help align the main vertical support when it is put in place, a slot in the middle of the base is created. The vertical support will be made containing more bracing the 5.5” of pine. The base design using the SketchUp is shown below with each section in red, blue, and purple.
The construction of the base may use some scrap wood and be more resourceful. Before marking the wood, the ends are squared and the pieces are put together using 10d nail fasteners. The blue section in the middle will be done twice. The part labeling will not be required and the assembly will be simpler if any of the red/purple base pieces could go with either of the blue pieces. More of the photos of the base construction are shown below.
The vertical piece that goes in the center of the base which holds the axle of trebuchet is the main support. There are 3 components that comprise each of the two supports. The main support will be 15’6” tall when the pieces are bolted together as shown in the SketchUp design below. The same techniques that were employed in the base construction were used in the main support. The initial assembly involve putting the pieces together as shown in the next image.
Some method of attachment is needed by the two 18’ long pieces to one another. The two nearly identical components that are bolted together will comprise each base. Both components will be attached by some sort of rod as the long ends of the base slip into the channels. The vertical pieces present are for diagonal braces of the main support piece where one end of the diagonal attaches at the base section’s end and another attaches up at the top of the main support. The most complicated part of the build is the assembly of these pieces and due to the length of nails, the nailing has to be done in a specific order. A SketchUp drawing is shown below along with the finished construction.