# Counterweight

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Slew ring (turntable) – The gears which a crane uses to rotate. This is a fixed location usually directly under the operators cab. Counterweights – A set of large weights positioned in line with the boom but located on the opposite side of the slew ring. Figure 1: Anatomy of a Tower Crane (Wick, 2010) 2. How Cranes Work A cranes purpose is to pick up and move objects in a horizontal and/or vertical direction before placing them down again. The size of the load a crane can lift is based on its weight rating. This varies greatly between cranes and often two cranes with the same or similar ratings will be required on a large building site to ensure all lifts can be made. 2.1 Load Charts & Lifting Capacities The capacities listed in a cranes load chart are not the actual loads that can be lifted on the…

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Jess King Mr. Neill Physics 9 November 2016 The History of a Trebuchet Have you ever been curious to learn more about how such an immense machine, like the trebuchet, came to be? The creation of the trebuchet is believed to have been around the 12th century. However, the exact time period of the creation remains unknown. The trebuchet was said to have been created by soldiers, starting from scratch, so it may not have been so intimidating. However, it has continually progressed to improve…

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more times, and the average calculated. The experiment was then repeated for all the other knots on the sling (6, 9, 12, 15). The maximum theoretical flight distance was then calculated for the Trebuchet. This was done by using the formula, 2xMass of the Trebuchet counterweightMass of the projectilex Drop distance of the counterweight. The Trebuchet efficiency was calculated for each of the distances…

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version of the stave sling that used a large counter weight to propel a 900-kilogram projectile up to 300 yards. There were three designs for the trebuchet that we know was finalized. At first there was the traction trebuchet which was operated by a team of men pulling on a rope. Then there was a hybrid trebuchet, which was a mixture of using counterweights and a team of men to pull the ropes. Engineers in the east and Mediterranean invented this design and it was used to great effect. Then the…

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Once this is done, the counterweight (i.e. potential energy) is increased by weight (in this experiment those take the form of ~0.5 kg weights) being added. The sling and projectile are put into position below the hinge under the beam, and upon triggering the projectile is accelerated as the gravitational potential energy of the counterweight begins to turn into kinetic energy (energy of movement). The sling portion of the trebuchet serves to magnify this by first moving the projectile…

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stones it was capable of collapsing walls and even whole fortresses or buildings. Additionally, by using the trebuchet medieval warriors were able to destroy a city in a shorter amount of time(Devries and Smith). Although the trebuchet had multiple uses and it was considered invaluable there were some disadvantages to using it. For example, the trebuchets required skillful engineers to operate it, and these engineers often became sick, were killed, or left because they were unpaid. Also, these…

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time, by way of a raised counterweight. A trebuchet works by using the energy of a falling counterweight to launch a projectile, while using mechanical advantage to achieve a high launch speed. For maximum launch speed, the counterweight must be much heavier than the payload, since this means that it will "fall" quickly. In some designs, a guide chute is used to guide the sling along and support the payload until the speed is great enough to hold it in the pouch alone. The counterweight pivots…

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the energy of a falling (and sometimes hinged) counterweight to launch a projectile (such as a rock or a pot of flaming oil), using mechanical advantage to achieve a high launch speed. For maximum launch speed the counterweight must be much heavier than the payload, since this means that it will "fall" faster. the word 'Trebuchet' derived from the Old French word 'Trebucher' meaning to throw over and was also known (along with many other english siege weapons) as the Ingenium from the Latin…

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What causes the projectile to launch at very far distances? There are multiple aspects which make the object launch at a far distance and at a great speed. In fact, trebuchets are very similar to seesaws. For the arm to swing forward, there is a weight attached at the shorter end of the arm called a “counterweight”. This counterweight acts as the force to propel the weight attached at the long end of the trebuchet. Hence, when the counterweight is being pulled up, the arm stores gravitational…

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One side of the lever goes up as the other one goes down. To explain for the launch to commence the counterweight must be much heavier than the object or projectile. This has to be simply because the opposite side of the trebuchet has to be lifted up with extreme force to get it moving. For example if there was a little kid on a see-saw and he wanted to reach the top a tree without climbing it. An elephant would have to jump onto the other side to get the little kid to his destination up in…

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