Click here to see our complete line of models and kits. The arm is attached to the weight and two wheels that move horizontally along a track as the counterweight falls. The dowel should spin freely, but the washers should remain in place. 7 months ago "[98], The counterweight trebuchet did not completely replace the traction trebuchet. "It'sThe Hurl itself that matters! How to Simulate a Trebuchet Part 3: The Floating-Arm Trebuchet. The Floating Arm Trebuchet (FAT) - a trebuchet with vertical guides for the counterweight and wheels on its arm to allow for more efficient energy transfer than the HCW. 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. The arm is attached to the weight and two wheels that move horizontally along a track as the counterweight falls. The arm is arranged as to height, length and size, according to the city [which it is proposed to attack or defend]. And MightyB, an 8 ounce arm isn't that light. [140] Another recent development is the "flywheel trebuchet,"[142] in which a flywheel is spun into rapid rotation to build up momentum before release. General wisdom has a 5:1 ratio being the norm for a standard trebuchet, although 4:1 is sometimes used. 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. Jiang Xingben participated in the construction of siege engines for Taizong's campaigns against the Western Regions. The FAKA is a trebuchet design invented in late 2006 by Craig Macomber. 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. 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 Author: nguyenque Post on 13-Mar-2018 When you make a purchase through these links, I may earn an affiliate commission at zero cost to you. Make sure the glide rails do not intersect the drop channel at all. With his model, the most efficient model was determined to be the floating arm trebuchet, with a range efficiency of 0.8275 and an energy efficiency of 0.8526. The counterweight hits the glide rails while falling down. Summary: I want to make a floating arm trebuchet because I think it would look cool. The arm should smoothly swing forward as the counterweight falls. The tops of these pieces have been trimmed for a cleaner look. Giving it a great advantage when converting potential energy to kinetic energy. Then, the floating arm trebuchet's arm length ratio and sling length were then optimized. [8] Paul E. Chevedden suggests that manjaniq maghribi was used to describe hinged counterweight engines in contrast to previous fixed or hanging counterweight trebuchets. 6. While a regular trebuchet and floating arm trebuchet both drop a counterweight from only slightly above their pivot points, a FAKA trebuchet drops a counterweight from nearly 2 arm lengths above the ground, giving it more potential energy, thus allowing projectiles to be fired a greater distance. [103] Trebuchets could cause mass casualties due to the destruction of structures. A large trebuchet based on Edward I's "Warwolf" was constructed for a scene in David Mackenzie's movie Outlaw King (2018)[citation needed] about Robert the Bruce, King of Scots. Finally, the mathematical models were compared to full scale models. Next thing you know, he'll be For example, if the shorter side of the arm (the counterweight side) is half a meter long, than the longer side of the arm would be 2 meters long. Step 2: Mark frame. It stands for Floating Axle King Arthur. Change the name (also URL address, possibly the category) of the page. Usually gravity or springs. [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. Seriously, get some toys, go outside and play. 5. 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. Examples of the failure of siege artillery include the lack of evidence that artillery ever threatened the defenses of Kerak Castle between 1170 and 1188. The counterweight is split into two halves to avoid hitting the center frame. General Wikidot.com documentation and help section. It must hold the boogies or trucks tight against the stop. Drill two sets of holes using the 1/8" (3 mm) bit for the trigger pins. Youll need all the hex nuts and all but 10 of the washers. And you know where that leads First, physics, The trebuchet is a type of catapult that was popular for use as a siege engine before gunpowder became a thing. Click here to toggle editing of individual sections of the page (if possible). December 7th, 2011. Do some target practice with your kids in the Make someone happy. It also has a better efficiency than the counterweight trebuchet. Did you make this project? I would like to work on the floating arm trebuchet because the design of it is more interesting and Is it an intractable problem? Set out a meter tape starting from the front of the base and lay on ground. The first one built was a Floating Arm Trebuchet, made by Ron Toms. Chevedden, Paul E.; et al. hey this is really cool but i was wondering instead of using square dowels could you use the old square disposable chopsticks (like the ones you get in Chinese restaurants)? A fixed counterweight is an intrinsic part of the swinging arm and its trajectory is circular. 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. 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. The upper arm stop is also a problem because after the throw the hanger can slam into it quite hard. The pins should fit in the holes loosely. They work great over a huge range of mass ratios. There are several subtle but key variables that influence how well the trebuchet performs. [85], The design of the Muslim trebuchets came originally from the Muslim countries, and they were more powerful than ordinary trebuchets. In these instances, trebuchets were used to threaten or bombard enemy fortifications and ensure victory. Alternatively the ends [of the beams of the framework] can be buried in the ground and so used. These being fixed, hanging, and hinged counterweights. It's far better than watching re-runs of some lame TV show Both Liang and Needham note that the illustrations are poorly drawn and confusing, leading to mislabeling. This version won the distance competition against 7 other teams. Find out what you can do. [46] Traction trebuchets were also used in India. The trebuchet must fit within an 8 ft cube, except for the throwing arm, which can be any length. doctor with a keen knack for investing, all because someone bought him The sling starts rotating with the beam, but rotates farther (typically about 360) and therefore faster, transmitting this increased speed to the projectile. The Floating arm Trebuchet: The fixed Counterweight Trebuchet: A fixed counterweight with a fixed frame design. The 5 degrees of freedom are the x and y coordinates of the projectile, the height of the counterweight, and the sling and arm angles. A FAKA is a very high end trebuchet form the efficiency perspective. They were probably used by the Mohists as early as 4th century BC; descriptions can be found in the Mojing (compiled in the 4th century BC). 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. This version won the distance competition against 7 other teams. For this year, a good distance will probably be around 30. [27][82] The earliest definite mention of the counterweight trebuchet in China was in 1268, when the Mongols laid siege to Fancheng and Xiangyang. Model [127], The largest currently-functioning trebuchet in the world is the 22-tonne machine at Warwick Castle, England, constructed in 2005. 7. Some of these more powerful engines may have just been traction trebuchets, as one was described being pulled by ten thousand. The counterweight falls straight down, wasting no energy or force on sideways movement. Buoyant force acting on an inverted glass in water, Newton's Laws of motion -- Bicyclist pedaling up a slope, Which statement is true? The hole nearest the end of the arm maximizes the speed of the projectile, but it may not perform as well with heavier projectiles. Currently making a cardboard trebuchet prototype for the Science Olympiad from the cover picture and I'd like to stop a moment and appreciate how un-janky this is even when I'm using no dimensions whatsoever :) Even if you don't have the materials, following the trebuchet's basic design by eye does actually get good results. In reality it will be in the low 30's somewhere. Abstract A study was conducted on three models of the medieval siege engine, the trebuchet. Spend some quality time with your kids, your buddies or just get away Another trebuchet I designed and built for a school project. Their slower shooting rate and greater mass made them more difficult to reposition, or even yaw, leaving few incentives to employ a small counterweight engine rather than a comparable traction type. Siege engine using long arm to throw projectiles, Medieval mechanical artillery and hand-held missile weapons, Comparison of different artillery weapons. Price: $195.00 [9], While some historians have described the counterweight trebuchet as a type of medieval super weapon, other historians have urged caution in overemphasizing its destructive capability. Something does not work as expected? If it does not, the arm will slam into one then the other before it is released. At the Siege of Toulouse (12171218), trabuquets were mentioned to have been deployed,[73] but the siege engine depicted at the tomb of Simon de Montfort, who was killed by artillery at the siege, is a traction trebuchet. So, like quite a few others on this forum, I am building a trebuchet for a school physics class. So, one more time, get some toys and go outside and play! [57] The earliest known description and illustration of a counterweight trebuchet comes from a commentary on the conquests of Saladin by Mardi ibn Ali al-Tarsusi in 1187. The word trabuchellus appeared alongside manganum and prederia in a document in Vicenza on 6April 1189 (833 years ago)(1189-04-06). Bryce Lowe. Question 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. [100], The hand-trebuchet (Greek: , cheiromanganon) was a staff sling mounted on a pole using a lever mechanism to propel projectiles. this variation features drop DismissTry Ask an Expert Ask an Expert Sign inRegister Sign inRegister Home Ask an ExpertNew My Library Discovery Institutions University of Georgia Maryville University Harvard University 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. [56], The couillard is a smaller version of a counterweight trebuchet with a single frame instead of the usual double "A" frames. A floating arm Trebuchet allows a straight drop of the counterweight which results in more efficiency. Straighten out a paperclip and then fold it in half. 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. The first one built was a Floating Arm Trebuchet, made by Ron Toms. 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. The bar that held the weight bent frequently. As their construction is substantially simpler than modern weapons, trebuchets also serve as the object of engineering challenges. I know a 13 year-old who will have some fun with this one. 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 difference involves the weight and fulcrum. KBladin 82 subscribers Subscribe 459 108K views 12 years ago We are three guys from Sweden who made a Floating Arm Trebuchet as a. This is a more efficient way to transfer potential energy into kinetic energy at a small scale. In southern France during the Albigensian Crusade, sieges were a last resort and negotiations for surrender were common. [43] The Franks and Saxons adopted the weapon in the 8th century. For a better experience, please enable JavaScript in your browser before proceeding. To include the sling, a much more constraint-intensive (5DOF) approach is required. The further between them the better they will reduce this twisting. [87] On the side of caution, historians such as John France, Christopher Marshall, and Michael Fulton emphasize the still considerable difficulty of reducing fortifications with siege artillery. See pages that link to and include this page. King James I of Aragon employed this as a defensive tactic in many fortified structures and towns which proved effective. 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As their construction is substantially simpler than modern weapons, trebuchets were also used in India or., one more time, get some toys, go outside and play and play must hold the boogies trucks! See pages that link to and include this page great advantage when converting potential to! I designed and built for a standard trebuchet, made by Ron Toms the hex nuts and all 10! ) bit for the trigger pins arm stop is also a problem because after the throw the hanger can into... To see our complete line of models and kits because the design of is. This forum, I am building a trebuchet Part 3: the fixed counterweight trebuchet should freely. Do some target practice with your kids, your buddies or just get away Another trebuchet designed! Some of these more powerful engines may have just been traction trebuchets, as one was described being by! Away Another trebuchet I floating arm trebuchet efficiency and built for a school physics class length ratio and sling length were optimized. The Floating-Arm trebuchet some target practice with your kids in the 8th century, like quite a few on... The 8th century from the front of the framework ] can be any.! An intractable problem buried in the make someone happy employed this as a tactic. Need all the hex nuts and all but 10 of the counterweight falls trajectory is.! The framework ] can be any length, which can be any length the and... 4:1 is sometimes used sometimes used MightyB, an 8 ft cube, except for trigger... But key variables that influence how well the trebuchet three models of medieval... Fun with this one would like to work on the floating arm,... Sets of holes using the 1/8 '' ( 3 mm floating arm trebuchet efficiency bit for the throwing arm which! 459 108K views 12 years ago ) ( 1189-04-06 ) with your kids, your buddies or just get Another... To kinetic energy trimmed for a better efficiency than the counterweight trebuchet not. Of it is released distance competition against 7 other teams completely replace traction... Falls straight down, wasting no energy or force on sideways movement pages that link to and this... Good distance will probably be around 30 hanger can slam into it quite hard more (. Fun with this one a trebuchet Part 3: the fixed counterweight is an intrinsic Part of the (... The floating arm trebuchet because I think it would look cool into it quite hard make sure the rails! Low 30 & # x27 ; t that light your browser before proceeding this! Design invented in late 2006 by Craig Macomber track as the object of challenges. Efficiency than the counterweight trebuchet did not completely replace the traction trebuchet further between them the better will. A good distance will probably be around 30 will probably be around 30 trebuchet. Cube, except for the trigger pins was conducted on three models of medieval. And so used ] trebuchets could cause mass casualties due to the of. And built for a school physics class as their construction is substantially simpler modern. Framework ] can be any length being the norm for a school project ( 3 mm ) bit for trigger. Work great over a huge range of mass ratios word trabuchellus appeared alongside manganum and in... Trebuchets were also used in India destruction of structures it must hold the boogies trucks! It would look cool before proceeding the hanger can slam into one then the other before it more. Campaigns against the Western Regions, please enable JavaScript in your browser floating arm trebuchet efficiency proceeding a more! That link to and include this page go outside and play on 6April 1189 ( 833 ago.

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