Our machine threw an official ft. The closest competition threw ft. We dominated! My office does a good job of having fun activities for us during the year. Here are the rules. No ready-made kits 2.
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Basic design[ edit ] A traditional trebuchet, which is simple to engineer, consists of an arm resting off-centre on an axle with a hinged counterweight at the short end of the arm. In contrast, a floating arm trebuchet features an axle on the arm freely moving along a horizontal glide track. The arm is on a moving axle and the torque acts on the entire structure, preventing stalling.
This linear drop of the counterweight is more efficient in transferring potential energy to kinetic energy than the pendulum counterweight motion of a traditional trebuchet. Upon releasing the trigger, the counterweight is allowed to drop through the channel. While this is happening, the wheel is moved backwards by the torque acting on the arm from the counterweight. To reset the device, the counterweight must be raised back to the original height and locked in with the trigger mechanism.
While the floating arm design can have a lighter frame than a traditional trebuchet because the overall forces produces are less,  the impact of the arm on the glide track will cause eventual damage and may need maintenance.
Reducing the drop distance of the wheel axle to the glide track would reduce damage, but also reduce the range of the trebuchet. Trigger mechanism[ edit ] The most common of several trigger mechanisms is two eye bolts and a peg through both bolts.
In larger designs, the trigger system is applied at the top of the drop channel. Large scale designs require special trigger mechanisms that can hold the weight of the throwing arm. The release mechanism is a hook with a specific bend in its tip to determine when centripetal force will release one end of the sling, freeing the projectile to continue on its path.
Friction when the counterweight is dropping down to the glide strike can be reduced by using silicone grease or a thin film of plastic on the drop channel. To reduce friction of the sling on the launch track, the track should have a smooth surface.
A regular trebuchet is a better realistic war machine. However, a floating arm trebuchet is more efficient when built to a size of between one meter and five meters,  making it suitable for hobbyists and model builders.
Floating Arm Trebuchet (F2K)
This is it. The part of the war machine that means business. The Arm. You need: 6 segments of 2 ft. Before we start, there were a few problems. I did not have a drill bit long enough to go through all of the 2 x 4s of the short arm, so I had to drill individual holes in each individual 2 X 4 and hoped that they lined up.
Modified Floating Arm Trebuchet
Ensure that the shafts you choose have a diameter that mates well with your inside wheel diameter, as well as your inserts. Our shafts were steel bar. The weight bar was 1. At the tip of the arm, we welded a steel box around it to hold the pin for the sling release and a loop to tie the other end of the sling rope to. This could be done other ways, but our method looks really cool. The pin is made of all thread, 1 ft long, with the threads on the end ground off. This allows us to swap out pins, or adjust forward and backward.
Floating arm trebuchet
Floating Arm Trebuchet