It was determined that the optimal arm length ratio was approximately 1:2, where the short arm is 1.7 feet and the long arm is 3.3 feet. A loop at the end of the string allows the projectile to attach to the paperclip. How wide were your paint stirrers? The trebuchet is 2 meters (6,5 ft) high.Blueprints:http://postimg.org/image/qzydc1109/http://postimg.org/image/8mxs1gqjd/http://postimg.org/image/htg2oqvrt/(Sorry for bad quality) This design appeared in the late twentieth century. It was a straight shot past Seggrit's usual setup area to the place their fourth trebuchet was set up. The first, and arguably the more useful of the two, is the ratio of the range actually attained by an actualized treb, to the range of the theoretical ideal trebuchet given above. If it does not, the arm will slam into one then the other before it is released. This is why more than one wheel is used. concentration. One modern technological development, especially for the competitive pumpkin-hurling events, is the "floating arms" design. they're learning it. Step 2: Mark frame. Then, the floating arm trebuchet's arm length ratio and sling length were then optimized. Trebuchets were still used both at the siege of Burgos (14751476) and siege of Rhodes (1480). Jiang Xingben participated in the construction of siege engines for Taizong's campaigns against the Western Regions. They were used as defensive weapons stationed on walls and sometimes hurled hollowed out logs filled with burning charcoal to destroy enemy siege works. Something does not work as expected? In response, the Seljuks constructed another one requiring 400 men to pull and threw stones weighing 20 kg. Insert a 2" (5cm) piece of round dowel into one of the remaining holes. "The Trebuchet". With. Procedures for testing the trebuchet. 1 year ago, Question A fixed counterweight is an intrinsic part of the swinging arm and its trajectory is circular. . The rotation speed of the throwing beam increases smoothly, starting slow but building up quickly. This is unlike the violent sudden stop inherent in the action of other catapult designs such as the onager, which must absorb most of the launching energy into their own frame, and must be heavily built and reinforced as a result. The hinged trebuchet achieved efficiencies of 0.8065 for both range and energy efficiency and the "see-saw" with efficiencies of only 0.567 and 0.570, respectively. Trebuchets compete in one of the classifications of machines used to hurl pumpkins at the annual pumpkin chucking contest held in Sussex County, Delaware, U.S. At the siege of Kaysum, Abdallah ibn Tahir al-Khurasani used artillery to damage houses in the town. Did you make this project? [18] Further increasing their complexity is that either winches or treadwheels, aided by block and tackle, are typically required to raise the more massive counterweights. We are three guys from Sweden who made a Floating Arm Trebuchet as a school project. Floating Arm Trebuchet - Competition Version The new, stronger F.A.T. Buoyant force acting on an inverted glass in water, Newton's Laws of motion -- Bicyclist pedaling up a slope, Which statement is true? The Floating arm Trebuchet: The fixed Counterweight Trebuchet: A fixed counterweight with a fixed frame design. is a siege machine with a modern twist. "-TheHurl, Creative Commons Attribution-ShareAlike 3.0 License. Assemble the metal components with the square dowel in the center. Wikidot.com Terms of Service - what you can, what you should not etc. [97] The Song dynasty described countermeasures against counterweight trebuchets that prevented them from damaging towers and houses: "an extraordinary method was invented of neutralising the effects of the enemy's trebuchets. View/set parent page (used for creating breadcrumbs and structured layout). After initial shots, we tried to optimize our throwing distance. [17] The trebuchet had further modifications to allow an increase to its range, by creating a slot for the sling and projectile to sit underneath the trebuchet, enabling the sling to be lengthened and thus extending the range, an alteration in the trajectory, or the release point to be changed. The tops of these pieces have been trimmed for a cleaner look. Check out how this page has evolved in the past. [5] Mainly, how do I tell the displacement of the end of the arm (I know how to find Kinetic energy). My FAKA has misfired once, and it lead to the wheels smashing into the front stop and derailing the arm. Download files and build them with your 3D printer, laser cutter, or CNC. Basically, it gets a lot of energy for it's size and weight, and uses it very well, but there are many challenges. [47] Ibn al-Adim describes a traction trebuchet capable of throwing a man in 1089. It rang hollow. This awesome. Traction trebuchets use human power; on command, men pull ropes attached to the shorter end of the trebuchet beam. It's hard to build, and unstable to operate. Click here to edit contents of this page. Track Gap in many designs; Hard to build . Use the 5" (12.5 cm) pieces of paint stirrer and the four 6" (15 cm) square dowel pieces to form the glide rails. doctor with a keen knack for investing, all because someone bought him When attempting to breach enemy walls, it is important to use materials that will not shatter on impact; projectiles were sometimes brought from distant quarries to get the desired properties. Of this, the Hongwu Emperor stated in 1388: "The old type of trebuchet was really more convenient. In recent years several trebuchets has been created capable of throwing cars. Al-Tarsusi referred to the counterweight trebuchet as the "Persian" trebuchet whereas the "Frankish" trebuchet was a light traction engine. then math, engineering and economics. In 1090, Khalaf ibn Mula'ib threw out a man from the citadel in Salamiya with a machine and in the early 12th century, Muslim siege engines were able to breach crusader fortifications. Giving it a great advantage when converting potential energy to kinetic energy. It has derailed several other times, but so far no major damage has occurred. [31] In 617 Li Mi (Sui dynasty) constructed 300 trebuchets for his assault on Luoyang, in 621 Li Shimin did the same at Luoyang, and onward into the Song dynasty when in 1161, trebuchets operated by Song dynasty soldiers fired bombs of lime and sulphur against the ships of the Jin dynasty navy during the Battle of Caishi. 4. The arm is arranged as to height, length and size, according to the city [which it is proposed to attack or defend]. The trebuchet must fit within an 8 ft cube, except for the throwing arm, which can be any length. If you want to discuss contents of this page - this is the easiest way to do it. . The illustration above gives a diagram of a "floating-arm" trebuchet. Question The design is reportedly quite efficient, similar to a floating arm trebuchet, with a very . When the trebuchet is operated, the force causes rotational acceleration of the beam around the axle (the fulcrum of the lever). Would you know the efficiency of the machine? The drop channel between the pair of dowels on each side of the base is 1/4" (6 mm) wide. The counterweight is split into two halves to avoid hitting the center frame. Hello, Sign in. According to the Song of the Albigensian Crusade, the defenders "ran to the ropes and wound the trebuchets", and to shoot the machine, they "then released their ropes. Create some projectiles from household items. We're doing our part, now you need to do yours. [71] Chevedden argues that given the references to new and better trebuchets that by the 112030s, the counterweight trebuchet was being used in a variety of places by different peoples such as the crusader states, the Normans of Sicily and the Seljuks. The origin of the word "trebuchet" is uncertain. Find out what you can do. The difference involves the weight and fulcrum. It's good for you. This project requires precise measurements to work consistently. Then when you reach your destination, you encircle the city, set them up, and start shooting! However no illustrations or descriptions of the device exist from the time when they were supposed to have been used. motion. ), Barrett, The Honors College Thesis/Creative Project Collection, Mechanical and Aerospace Engineering Program, Sharing Materials: ASU Digital Repository Guide, Trebuchet Mechanics: Modeling and Optimization of the Trebuchet. The floating arm trebuchet is a modern take on an ancient war machine. The rapid displacement of torsion siege engines was probably due to a combination of reasons. Trim the axle until it is flush with the wheels. 2023 Physics Forums, All Rights Reserved, Trying to Figure out Tension force angle on Arm, Evaluating minimum and maximum values with calculations, Statics: Hydraulic jack lifting a telescopic extension arm ("Cherry Picker"), Density versus Pressure -- Balancing the bouyancy of a floating capsule, Hollow and solid spheres floating in liquid, Resultant pedal force (FRESULTANT) Force tangential to the crank arm, Cylinder in a slotted arm moved by a forked rod (particle dynamics, kinetics). 6 years ago. A straighter paperclip will result in a quicker release and a higher trajectory. Aside from being very efficient this trebuchet is more mechanically sound and that is why I would like to . Make sure the throwing arm rests between the glide rails before launch as shown in the image above. I've scoured the Internet for a mathematical model (or at least an attempt at one) for the behavior of a floating-arm trebuchet and have had zero luck. plus of a linear mass drop is that you should be able to make the mechanism pretty low friction and pull off some good efficiency numbers. The angle of the bend in the paperclip will determine the timing of the projectiles release. 5. [8][61] Later during the 13th century, Muslims used manjaniq maghribi (Western trebuchet) and manjaniq ifranji (Frankish trebuchet) to refer to counterweight trebuchets. In reality it will be in the low 30's somewhere. KBladin 82 subscribers Subscribe 459 108K views 12 years ago We are three guys from Sweden who made a Floating Arm Trebuchet as a. A trebuchet is a battle machine used in the middle ages to throw heavy payloads at enemies. Is it possible to make it so you can just attach a weight to the end? (14 pages!) Operation Trebuchet: Efficiency of the Floating Arm Tyler Thibodeau, Drew Prosser, Kevin Chan, and Jack Stevenson 31 May 2011 Governor's School for Science and Technology. [63], There is some evidence that the counterweight trebuchet could be transported. The sling starts rotating with the beam, but rotates farther (typically about 360) and therefore faster, transmitting this increased speed to the projectile. "[35][36][24][37] At the same time, the late Roman Empire seems to have fielded "considerably less artillery than its forebears, organised now in separate units, so the weaponry that came into the hands of successor states might have been limited in quantity. [104] They could also be equipped with their own wheels, as shown in two 17th- and 18th-century Chinese illustrations, which are also the only Chinese depictions of counterweight trebuchets on land. The trebuchet is a type of catapult that was popular for use as a siege engine before gunpowder became a thing. Also, the Golf Ball Beast lifts the back of the frame just before the arm is released. The boogies, or trucks, which ride the tracks, need to prevent the axle from twisting relative to the frame, If one side gets ahead of the other, it will likely jam, but the counterweight or the arm might also strike the frame. The payload could be thrown a far distance and do considerable damage, either by smashing down walls or striking the enemy while inside their stronghold. Form the base using two whole paint stirrers and the two 6" (cm) pieces. A trebuchet[nb 1] (French: trbuchet) is a type of catapult[5] that uses a long arm to throw a projectile. This is the floating arm trebuchet with a sling. Weapons stationed on walls and sometimes hurled hollowed out logs filled with charcoal. Ft cube, except for the competitive pumpkin-hurling events, is the `` ''... Use as a siege engine before gunpowder became a thing files and build them with 3D... 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Human power ; on command, men pull ropes attached to the counterweight is intrinsic! Heavy payloads at enemies a sling it possible to make it so you can, what can! Hurled hollowed out logs filled with burning charcoal to destroy enemy siege works popular use. The lever ) pull and threw stones weighing 20 kg take on an ancient war machine Competition Version new... Weight to the paperclip will result in a quicker release and a higher trajectory technological development, especially for competitive... You want to discuss contents of this page has evolved in the past of the lever ) the Golf Beast. Straight shot past Seggrit & # x27 ; s arm length ratio and sling length were then optimized major has... Shorter end of the base using two whole paint stirrers and the two 6 '' ( 5cm piece..., or CNC `` trebuchet '' is uncertain and a higher trajectory its trajectory is circular 108K views 12 ago! Wikidot.Com Terms of Service - what you can just attach a weight to wheels... Service - what you can just attach a weight to the shorter end of the word trebuchet... Stirrers and the two 6 '' ( cm ) pieces - what you can, what should.