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Large scale designs require special trigger mechanisms that can hold the weight of the throwing arm. Retrieved November 13, The arm is on a moving axle and the torque acts on the entire structure, preventing stalling.
Floating arm trebuchet
A floating arm trebuchet has three points of contact where friction can interfere with efficiency. To reduce friction of the sling on the launch track, the track should have a smooth surface. Their defining feature is free movement of an axle on the throwing arm,  and a linear drop channel for the counterweight.
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. This page was last edited on 5 Aprilat Technology on Your Time. Reducing the drop distance of the wheel axle to the glide track would reduce damage, but also reduce the range of the trebuchet. Kids Learn by Making Stuff.
A traditional trebuchet, which is simple to engineer, consists of an arm resting ar on an axle with a hinged counterweight at the short end of the arm. 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.
Views Read Edit View history. The most common of several trigger mechanisms is two eye bolts and a peg through both bolts. In contrast, a floating arm trebuchet features an axle on the arm freely moving along a horizontal glide track.
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.
In larger designs, the trigger system is applied at the top of the drop channel. Retrieved from ” https: The floating arm trebuchet loses the range advantage over regular trebuchet at very large scales, because the difficulty in construction of the drop channel and axle increases with size.
Floating arm trebuchet by Freddy Moreno on Prezi
The sling or pouch, which contributes to acceleration of the projectile and then releases it at the desired launch angle, is often made using polyester rope or other durable thin material. To reset the device, the counterweight must be raised back to the original height and locked in with the trigger mechanism.
Retrieved November 15, The Floating Arm Trebuchet is a counterweight siege weapon which is a modern variation  of the medieval trebuchet. While this is happening, the wheel is moved backwards by the torque acting on the arm from the counterweight.
Floating arm trebuchet – Wikipedia
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. The dropping of the counterweight forces the arm to swing wrm one side of the glide track and quickly jerk in the opposite direction to launch a projectile. Upon releasing the trigger, the counterweight is allowed to drop through the channel.
The design and construction of such machines is a popular project assignment in post-secondary engineering classes. Five Machines That Changed the World. From Wikipedia, the free encyclopedia.