FLOATING ARM TREBUCHET PDF

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.

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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, [5] 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, [6] making it suitable for hobbyists and model builders.

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Physics Trebuchet

Safety Adult supervision is required when building and operating a trebuchet. Use the information in the summary tab as a starting place. If you would like to discuss your ideas or need help troubleshooting, use the Ask An Expert forum. Abstract Before cannons widely replaced them, siege engines were often used by armies to throw large stones and other projectiles to break down castle walls. One of the most advanced siege engines used in the Middle Ages was the trebuchet, which used a large counterweight to store energy to launch a payload, or projectile. Figure 1, below, shows a modern reconstruction of a trebuchet. The range of a trebuchet has always been important.

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The Floating Arm Trebuchet

See also: Chinese siege weapons The traction trebuchet, also referred to as a mangonel in some sources, is thought to have originated in ancient China. They were probably used by the Mohists as early as 4th century BC, descriptions of which can be found in the Mojing compiled in the 4th century BC. They were used as ship mounted weapons by for attacking enemy fortifications. From this there rise up two posts having between them a horizontal bar which carries a single arm so that the top of the machine is like a swape. The arm is arranged as to height, length and size, according to the city [which it is proposed to attack or defend]. At the end of the arm there is a sling which holds the stone or stones, of weight and number depending on the stoutness of the arm.

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