[83] Chinese and Muslim engineers operated artillery and siege engines for the Mongol armies. If you have a hundred of those machines, then when you are ready to march, each wooden pole can be carried by only four men. This version won the distance competition against 7 other teams. View wiki source for this page without editing. "[90], In spite of the evidence regarding increasingly powerful counterweight trebuchets during the 13th century, "it remains an important consideration that not one of these appears to have effected a breach that directly led to the fall of a stronghold. Trebuchet instructables the floating arm trebuchet lancemakes the oating arm trebuchet is modern take on an ancient war machine. The dowel should spin freely, but the washers should remain in place. [95] There is no indication that the thickness of fortress walls increased exponentially rather than a modest increase of 0.5-1m between the 12th and 13th centuries. It must hold the boogies or trucks tight against the stop. Enter the modified floating arm trebuchet. :p. I've never seen this "floating arm" style of trebuchet before. The difficulties of coordinating the pull of many men together repeatedly and predictably makes counterweight trebuchets preferable for the larger machines, though they are more complicated to engineer. Trebuchets use a long arm to throw projectiles farther than traditional. You can look at the User Projects page to see how VirtualTrebuchet's predictions have compared to some real trebuchets that VirtualTrebuchet users have made. The Floating Arm Trebuchet is a counterweight siege weapon which is a modern variation of the medieval trebuchet.Their defining feature is free movement of an axle on the throwing arm, and a linear drop channel for the counterweight.The design and construction of such machines is a popular project assignment in post-secondary engineering classes. Click here to edit contents of this page. Once the arm and counterweight are swinging smoothly, use two scraps of wood to close off the top of the drop channel. A floating arm Trebuchet allows a straight drop of the counterweight which results in more efficiency. Append content without editing the whole page source. Floating Arm Trebuchet . It first appeared in China in the 4th century BC. The entire argument for the existence of hybrid trebuchets rests on accounts of increasingly more effective siege weapons. This has a counterweight stall when the arm is vertical, but doesn't trade off fall distance. One hole should be near the end of the dowel, and the other three are spaced 1" (2.5 cm) apart, starting 2" (5 cm) from the first hole. Loop the string onto the paperclip and place the projectile onto the base. This is a more efficient way to transfer potential energy into kinetic energy at a small scale. Question Make sure the glide rails do not intersect the drop channel at all. [14], The trebuchet is a compound machine that makes use of the mechanical advantage of a lever to throw a projectile. [49], Some exceptionally large and powerful traction trebuchets have been described during the 11th century or later. Floating Arm In this design the counterweight is constrained by a track to fall dead vertical, and the entire throwing arm, running on wheels set in a horizontal track, shifts to accomodate the counterweight. [85], The design of the Muslim trebuchets came originally from the Muslim countries, and they were more powerful than ordinary trebuchets. Floating arm designs are the best, for several reasons: The design allows the counterweight to fall the greatest distance, giving you the most potential energy you can harness. on Step 3. I would suggest at floating arm Trebuchet. Straighter counterweight drop; Reduces frame stress; Increased efficiency; Disadvantages. Of this, the Hongwu Emperor stated in 1388: "The old type of trebuchet was really more convenient. It's good for you. According to a stele in Barkul celebrating Tang Taizong's conquest of what is now Ejin Banner, the engineer Jiang Xingben made great advancements on trebuchets that were unknown in ancient times. Form the base using two whole paint stirrers and the two 6" (cm) pieces. [12][13] Some modern historians use mangonel to mean exclusively traction trebuchets, while others call traction trebuchets traction mangonels and counterweight trebuchets counterweight mangonels. [93] The Mamluks entered the city by sapping the northeast corner of the outer wall. This increases he overall efficiency of the trebuchet. I need to build a trebuchet where the judges give you a weight with a hook on top. Jiang Xingben participated in the construction of siege engines for Taizong's campaigns against the Western Regions. It combines the efficiency of a Floating Arm Trebuchet (FAT) with the increased potential energy of a King Arthur. The floating arm trebuchet uses a counterweight the vertically falls down a shaft created by two pieces of wood. [15], A trebuchet consists primarily of a long beam attached by an axle suspended high above the ground by a stout frame and base, such that the beam can rotate vertically through a wide arc (typically over 180). Watch headings for an "edit" link when available. | Learn more about Joshua Kukulsky's work experience, education, connections . Power Source. Jump to page: Lordbob75. Change the name (also URL address, possibly the category) of the page. Here's an even better reason- kids like to play with their parents and To begin, enter the parameters of your trebuchet in the input boxes. Ropes of rice straw four inches thick and thirty-four feet long were joined together twenty at a time, draped on to the buildings from top to bottom, and covered with [wet] clay. Floating Arm Trebuchet. Set up the trebuchet. [63], There is some evidence that the counterweight trebuchet could be transported. Center and hot glue the ends of the long pieces to the shorter cross pieces. Mainly, how do I tell the displacement of the end of the arm (I know how to find Kinetic energy). The trebuchet was preferred over a catapult due to its greater range capability and greater accuracy. Usually gravity or springs. Bryce Lowe. [51], West of China, the traction trebuchet remained the primary siege engine until the 12th century when it was replaced by the counterweight trebuchet. Basically, it gets a lot of energy for it's size and weight, and uses it very well, but there are many challenges. You are using an out of date browser. The main reason for doing this is to permit the counterweight to move . We launched pumpkins and bowling balls around 10-15 lbs at distances of 300+ feet. If you want to discuss contents of this page - this is the easiest way to do it. It's far better than watching re-runs of some lame TV show Click here to toggle editing of individual sections of the page (if possible). . the wheels:-height to top of arm when at rest 9 inches. This is why more than one wheel is used. The origin of the word "trebuchet" is uncertain. General Wikidot.com documentation and help section. Create the drop channel: Hot glue four square dowels upright at the center of the base. One of the most simplest designs but what it has in simplicity it lacks in efficiency. [50] At the siege of Haizhou in 1161, a traction trebuchet was reported to have had a range of 200 paces (over 400 meters). Unless otherwise stated, the content of this page is licensed under. Please message me to report broken links. A second component is the height that the axle will be placed above the platform of the trebuchet. [101] At the Siege of Acre (1291), both traction and counterweight trebuchets were used. The three models analyzed were the "see-saw", the hinged, and the floating arm trebuchet. The leftover energy goes into battering the axle trucks into the stops, and the hanger into the upper arm stop. This is bad because it adds stress to the frame when it re-contacts the ground, and could (And I think it did) derail the axle.1. Teach your kids something about safety, posture, focus and 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. It may not display this or other websites correctly. Below is. They work great over a huge range of mass ratios. Straighten out a paperclip and then fold it in half. This version won the distance competition against 7 other teams. "[89] Reservations on the counterweight trebuchet's destructive capability were expressed by Viollet-le-Duc, who "asserted that even counterweight-powered artillery could do little more than destroy crenellations, clear defenders from parapets and target the machines of the besieged. This machine lets you get your counterweight higher than a traditional trebuchet but keeps the pivot point low enough to keep with the rules of our competition. This is the floating arm trebuchet with a sling. "[100] The traction trebuchet continued to serve as an anti-personnel weapon. [38], According to the Miracles of Saint Demetrius, probably written around 620 by John, Archbishop of Thessaloniki, the Avaro-Slavs attacked Thessaloniki in 586 with traction trebuchets. [But whether you use] the 'Whirlwind' type or the 'Four-footed' type depends upon the circumstances. [63][64] Hanging counterweights hang below the arm and drop vertically. The oddity with this trebuchet is that it has no arm ratio as the counterweight sits at the very end of the arm, and the arm itself tends to be shorter. A large trebuchet was tested in late 2017 in Belfast as part of the set for the television series Game of Thrones.[130]. From the First Crusade (10961099) onward, there does not appear to be any discernible difference in the technology of siege engines employed by Muslim and Frankish forces, and by the Third Crusade (11891192), both sides seemed well acquainted with the enemy's siege weapons, which "appear to have been remarkably similar. The illustration above gives a diagram of a "floating-arm" trebuchet. I know a 13 year-old who will have some fun with this one. The Science Project Experiments Catapult Kit. The treb built for this guide is slight different, partly due to design and partly due to the materials that I had to work with, e.g. [19], A trebuchet projectile can be almost anything, even debris, rotting carcasses, or incendiaries, but is typically a large stone. [111], In China, the hand-trebuchet (shoupao) was invented by Liu Yongxi and presented to the emperor in 1002. [56], The couillard is a smaller version of a counterweight trebuchet with a single frame instead of the usual double "A" frames. [43] The Franks and Saxons adopted the weapon in the 8th century. I never knew you could make a trebuchet like that. Michael the Syrian noted that at the siege of Balis in 823 it was the defenders that suffered from bombardment rather than the fortifications. Give the trigger a swift tug to release the pins! In general, VirtualTrebuchet will over predict the performance of a trebuchet by some amount because it ignores things like friction. Check out how this page has evolved in the past. Adjusting the sling's release point is the primary means of fine-tuning the range, as the rest of the trebuchet's actions are difficult to adjust after construction. Step 5: Drill holes for axles. We are three guys from Sweden who made a Floating Arm Trebuchet as a school project. Al-Tarsusi referred to the counterweight trebuchet as the "Persian" trebuchet whereas the "Frankish" trebuchet was a light traction engine. We are advocates for the incorporation of Indigenous knowledge systems and research methodologies within contemporary library practice. The long part of the trebuchet's throwing arm should be around 4 times longer than the shorter side. Step 1: Cut lumber. Known as the Huihui trebuchet (, where "huihui" is a loose slang referring to any Muslims), or Xiangyang trebuchet () because they were first encountered in that battle. Be around 4 times longer than the fortifications the arm and drop vertically Learn! 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