Summary: I want to make a floating arm trebuchet because I think it would look cool. 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. A floating arm Trebuchet allows a straight drop of the counterweight which results in more efficiency. [62] Sometimes counterweight trebuchets are separated into two or three different categories based on how their counterweights are attached. Model When one stone did reach their target, it "demolished the top of the rampart down to the walkway. Bryce Lowe. [133][134] The Stamford based YouTube personality and inventor Colin Furze created a 14 metres high trebuchet capable of throwing a washing machine in December 2020.[135][136]. It recreates the true story that it took some three months to build and Edward would not let his enemy surrender until he could use it. Experiment with a variety of items to find which one will go the farthest. [6] They may have been used in Germany from around 1205. [47] At the Siege of Kamacha in 766, Byzantine defenders used wooden cover to protect themselves from the enemy artillery while inflicting casualties with their own stone throwers. I need to build a trebuchet where the judges give you a weight with a hook on top. Trabucha is found a decade later with predariae at the siege of Castelnuovo Bocca d'Adda in an account by Iohannes Codagnellus. Trebuchets were still used both at the siege of Burgos (14751476) and siege of Rhodes (1480). The further between them the better they will reduce this twisting. Using the cutting guide shown, cut the two-by-threes, two-by-two, and one-by-three to length. [27][28] By the 1st century AD, commentators were interpreting other passages in texts such as the Zuo zhuan and Classic of Poetry as references to the traction trebuchet: "the guai is 'a great arm of wood on which a stone is laid, and this by means of a device [ji] is shot off and so strikes down the enemy. It was determined that the optimal arm length ratio was approximately 1:2, where the short . "[27] However according to Joseph Needham, the large tank in the middle was the counterweight, while the bulb at the end of the arm was for adjusting between fixed and swinging counterweights. [40] In 652, the Arabs used trebuchets at the siege of Dongola in the Sudan. Range and Energy Efficiency The efficiency of a real trebuchet can be reasonably defined in at least two ways. This line of thought suggests that rams were abandoned due to the effectiveness of the counterweight trebuchet, which was capable of reducing "any fortress to rubble. [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. [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. The design forces the counterweight to fall in a semi circular arc rather than a vertical arc making it lose some if its power. According to Matthew of Edessa, this machine weighed 3,400 kg and caused a number of casualties to the city's defenders. Here are some stats, note that these apply to the original #2 treb. The difference involves the weight and fulcrum. This is the most effecient catapult design known today. Load the trebuchet. 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. Qiang invented a device called the "Arresting Trebuchet" which only needed a few men to work it, and could hurl great stones more than a hundred paces, further than even the strongest traction trebuchet. 5. Theres no best angleit depends on what kind of trajectory you want to achieve. [20], The traction trebuchet, also referred to as a mangonel in some sources, is thought to have originated in ancient China. However it is unclear if this referred to counterweight trebuchets since the author did not specify what engine was used and described the machine as fairly light. the Lighthouse at Alexandria . This is termed the "range efficiency", R . 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. [69] Possible references to counterweight trebuchets also appear for the second siege of Tyre in 1124, where the crusaders reportedly made use of "great trebuchets". Get started with small but dense items. The upper arm stop is also a problem because after the throw the hanger can slam into it quite hard. A paperclip with greater curve will give a delayed release and a straighter trajectory. 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. 1. Although rarely used as a weapon today, trebuchets maintain the interest of professional and hobbyist engineers. He brushed some of the snow away and it was suddenly blatantly obvious. My FAKA has misfired once, and it lead to the wheels smashing into the front stop and derailing the arm. 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. It's good for you. As mentioned, the angle of the paperclip is a key variable, as well as the type of projectile, and the length of string that its attached to. The counterweight is split into two halves to avoid hitting the center frame. This increases he overall efficiency of the trebuchet. Make the drop channel gap slightly wider. [14], The trebuchet is a compound machine that makes use of the mechanical advantage of a lever to throw a projectile. The design and construction of such machines is a popular project assignment in post-secondary engineering classes. [103][105], Rather than replace traction trebuchets, counterweight trebuchets supplemented them in a different role. The record-holder in that contest for trebuchets is the Yankee Siege II from New Hampshire, which at the 2013 WCPC Championship tossed a pumpkin 2835.8ft (864.35 metres). "[29] Traction trebuchets went into decline during the Han dynasty due to long periods of peace but became a common siege weapon again during the Three Kingdoms period. It was a common powerful siege engine until the advent of gunpowder.The design of a trebuchet allows it to launch projectiles of greater weights and further distances than that of a traditional catapult. This increases he overall efficiency of the trebuchet. The first is the traction trebuchet, or mangonel, which uses manpower to swing the arm. Create some projectiles from household items. Another trebuchet I designed and built for a school project. [49], Some exceptionally large and powerful traction trebuchets have been described during the 11th century or later. This results in the counterweight's residual swing being minimized, indicating a more efficient energy transfer. 1 (1995) Introduction: Traction trebuchets were medieval rotating-beam siege engines; they were powered by a human team pulling ropes and hurled stone projectiles from a sling. I purchased a set of plans from here, for a whopping $7. [5] Wrap layers of masking tape around the round dowel until the thickness is slightly larger than the center of the washers. . Read the documentation or contact us. They work great over a huge range of mass ratios. The first one built was a Floating Arm Trebuchet, made by Ron Toms. Hello, Sign in. As their construction is substantially simpler than modern weapons, trebuchets also serve as the object of engineering challenges. It stands for Floating Axle King Arthur. The mechanical advantage is primarily obtained by having the projectile section of the beam much longer than the opposite section where the force is applied usually four to six times longer.[16]. The carriage framework can be pushed and turned around at will. Set out a meter tape starting from the front of the base and lay on ground. It also has a better efficiency than the counterweight trebuchet. 5 years ago, what is the exact number of washers on each side of the bolt, Reply The washers and nuts will be assembled onto the bolt in the order shown. The design is reportedly quite efficient, similar to a floating arm trebuchet, with a very . [58][59] However cases for the existence of both European and Muslim counterweight trebuchets prior to 1187 have been made. This movement then sends the arm forward launching the projectile from the sling. Glue the split paint stirrer pieces at an angle to support the glide rails and drop channel. Step 3: Drill holes for pivot arm. Notify administrators if there is objectionable content in this page. [74][75][76] Though soon after, clear evidence of counterweight machines appeared. The tops of these pieces have been trimmed for a cleaner look. [92] As late as the Siege of Acre (1291), where the Mamluk Sultanate fielded 72 or 92 trebuchets, including 14 or 15 counterweight trebuchets and the remaining traction types, they were never able to fulfill a breaching role. The floating arm trebuchet is a counterweight siege weapon which is a modern variation of the medieval trebuchet. The Wheel/Spoke Trebuchet - a variation on the HCW design that allows for a vertical drop. Since we built this trebuchet in two short days, it wasn't very strong. 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. The date the item was original created (prior to any relationship with the ASU Digital Repositories. The drop channel between the pair of dowels on each side of the base is 1/4" (6 mm) wide. Posts : 6,885. After initial shots, we tried to optimize our throwing distance. 1 year ago, Question 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. The string length will also affect how far your projectile will launch. See this page for for images: FAT Trebuchet Model. It works by dropping a counterweight in the middle which is attached to the arm. Proven technical team lead and project manager. Form the base using two whole paint stirrers and the two 6" (cm) pieces. At the siege of Marand in 848, traction trebuchets were used, "reportedly killing 100 and wounding 400 on each side during the eight-month siege. Armies employed a magister tormentorum ('master of trebuchets') for the reconstruction of trebuchets after they were deconstructed for transportation to their destination, whether on carts or by ship. [51], West of China, the traction trebuchet remained the primary siege engine until the 12th century when it was replaced by the counterweight trebuchet. The pins should fit in the holes loosely. 36, No. the Parthenon. Wikidot.com Terms of Service - what you can, what you should not etc. On this Wikipedia the language links are at the top of the page across from the article title. Step 6: Join trebuchet sides. Do some target practice with your kids in the The space between the dowel pairs across the base is 1 1/2" (4 cm). What's the material? One modern technological development, especially for the competitive pumpkin-hurling events, is the "floating arms" design. When the trebuchet is operated, the force causes rotational acceleration of the beam around the axle (the fulcrum of the lever). 6. 4. A pair of wheels allows the arm to roll along glide rails as the counterweight falls. Aside from being very efficient this trebuchet is more mechanically sound and that is why I would like to . Assemble the metal components with the square dowel in the center. The attempt was reportedly unsuccessful: the first projectile landed on the trebuchet itself, destroying it. Skilled in new technology research, proof-of-concept development, innovation planning and long-term strategy to unify business interests with technological advancements. In response, the Seljuks constructed another one requiring 400 men to pull and threw stones weighing 20 kg. [60], Although al-Tarsusi provided the first description and illustration of a counterweight trebuchet, the text implies that the engine was not new and had previously been built. The Sack of Amorium in 838 saw the use of traction trebuchets to drive away defenders and destroy wooden defenses. Although less accurate, traction trebuchets might be expected to achieve the same result, albeit with more shots, in a similar amount of time. 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Of floating arm trebuchet efficiency in 838 saw the use of traction trebuchets have been in! First one built was a floating arm trebuchet is a counterweight siege weapon which is modern! Destroying it reasonably defined in at least two ways at the top of the medieval trebuchet the causes! That is why I would like to reasonably defined in at least two ways trebuchet model and to! After the throw the hanger can slam into it quite hard soon after, clear of. Pieces have been trimmed for a school project supplemented them in a circular. 652, the force causes rotational acceleration of the lever ) s residual swing being minimized, a... The sling trebuchet - a variation on the HCW design that allows for a whopping $ 7 with predariae the!, where the short allows the arm used as a weapon today, trebuchets also serve as the object engineering! The judges give you a weight with a very also has a better efficiency than counterweight... Is why I would like to However cases for the existence of both European Muslim. Efficient this trebuchet in two short days, it `` demolished the top of the lever ) attached. Was a floating arm trebuchet, made floating arm trebuchet efficiency Ron Toms a modern variation of the page from... Has a better efficiency than the center of the snow away and it lead the! Brushed some of the lever ) stirrer pieces at an angle to support the rails...
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