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==Trebuchets versus torsion==
==Trebuchets versus torsion==


The trebuchet is often confused with the earlier [[torsion siege engine]]s. The main difference is that a torsion siege engine (examples of which include the [[Onager (siege weapon)|onager]] and [[ballista]]) uses a twisted rope or twine to provide power, whereas a trebuchet uses a counterweight, usually much closer to the fulcrum than the payload for [[mechanical advantage]], though this is not necessary. A trebuchet also has a [[sling (weapon)|sling]] holding the projectile (although the Roman [[Onager (siege weapon)|onager]] often had a sling as well), and a means for releasing it at the right moment for maximum range. Jordan Plavsity doesn't know anything about trebuchets, and will fail at the project.
The trebuchet is often confused with the earlier [[torsion siege engine]]s. The main difference is that a torsion siege engine (examples of which include the [[Onager (siege weapon)|onager]] and [[ballista]]) uses a twisted rope or twine to provide power, whereas a trebuchet uses a counterweight, usually much closer to the fulcrum than the payload for [[mechanical advantage]], though this is not necessary. A trebuchet also has a [[sling (weapon)|sling]] holding the projectile (although the Roman [[Onager (siege weapon)|onager]] often had a sling as well), and a means for releasing it at the right moment for maximum range. Currently, the best trebuchet ever to be built at MPHS will be built by Joseph and Derek. It will totally smash mitchell, bryan, and jp's.


==History==
==History==

Revision as of 19:20, 15 November 2011

For the typeface, see Trebuchet MS. For the chess term for the side to move loses, see Zugzwang.
Trebuchets at Château de Castelnaud
Counterweight trebuchet constructed on the design of the "Warwolf"
File:Trebuchet simulator strobe picture.jpg
A strobe picture of a simulated trebuchet in action
Medieval traction trebuchet next to a staff slinger

A trebuchet[nb 1] (French trébuchet) is a siege engine that was employed in the Middle Ages. It is sometimes called a "counterweight trebuchet" or "counterpoise trebuchet" in order to distinguish it from an earlier weapon that has come to be called the "traction trebuchet", the original version with pulling men instead of a counterweight. The counterweight trebuchet appeared in both Christian and Muslim lands around the Mediterranean in the twelfth century. It could fling projectiles of up to three hundred and fifty pounds (140 kg) at high speeds into enemy fortifications.

The trebuchet did not become obsolete until the 15th century, well after the introduction of gunpowder, which appeared in Europe in second half of 13th century.

Basic design

A trebuchet is a type of catapult that works by using the energy of a raised counterweight to throw the projectile. Initially, the sling, which has a pouch containing the projectile, is placed in a trough below the axle, which supports the beam. Upon releasing the trigger, the sling and the beam swing around toward the vertical position, where one end of the sling releases, opening the pouch and propelling the projectile towards the target. The efficiency of the transfer of the stored energy of the counterweight to the projectile can be quite high, even without, for example, restraining the path of the counterweight.[3]

Modern-day enthusiasts have varied the original design, especially to control the path of the counterweight.[4]

The three chief distinguishing characteristics of a trebuchet are:

~ A ) The machine is powered exclusively by gravity; most often directly by means of a counterweight, though sometimes indirectly (such as in a traction trebuchet).

~ B ) Such force rotates a throwing arm - usually four to six times the length of the counterweight arm - to multiply the speed of the arm and, eventually, the projectile.

~ C ) The machine utilizes a sling affixed to the end of the throwing arm, acting as a secondary fulcrum, to further multiply the speed of the projectile.


Trebuchets versus torsion

The trebuchet is often confused with the earlier torsion siege engines. The main difference is that a torsion siege engine (examples of which include the onager and ballista) uses a twisted rope or twine to provide power, whereas a trebuchet uses a counterweight, usually much closer to the fulcrum than the payload for mechanical advantage, though this is not necessary. A trebuchet also has a sling holding the projectile (although the Roman onager often had a sling as well), and a means for releasing it at the right moment for maximum range. Currently, the best trebuchet ever to be built at MPHS will be built by Joseph and Derek. It will totally smash mitchell, bryan, and jp's.

History

Traction trebuchet

11th century chronicle depicting a Byzantine siege.

The trebuchet derives from the ancient sling. A variation of the sling, called staff sling (Latin: fustibalus), contained a short piece of wood to extend the arm and provide greater leverage. This evolved into the traction trebuchet in which a number of people pull on ropes attached to the short arm of a lever that has a sling on the long arm. This type of trebuchet is smaller and has a shorter range, but is a more portable machine and has a faster rate of fire than larger, counterweight-powered types. The smallest traction trebuchets could be powered by the weight and pulling strength of one person using a single rope, but most were designed and sized for between 15 and 45 men, generally two per rope. These teams would sometimes be local citizens helping in the siege or in the defense of their town. Traction trebuchets had a range of 100 to 200 feet (30 to 61 m) when casting weights up to 250 pounds (110 kg). It is believed that the first traction trebuchets were used by the Mohists in China as early as in the 5th century BC descriptions of which can be found in the Mojing (compiled in the 4th century BC). The Chinese named the later counterweight trebuchet Huihui Pao (Muslim Weapons, "huihui" means Muslim) or Xiangyang Pao (襄陽砲), where Pao means bombard.

The traction trebuchet next appeared in Byzantium. The Strategikon of Emperor Maurice, composed in the late 6th century, calls for "ballistae revolving in both directions," (Βαλλίστρας έκατηρωθεν στρεφόμενας), probably traction trebuchets (Dennis 1998, p. 99). The Miracles of St. Demetrius, composed by John I, archbishop of Thessalonike, clearly describe traction trebuchets in the Avaro-Slav artillery: "Hanging from the back sides of these pieces of timber were slings and from the front strong ropes, by which, pulling down and releasing the sling, they propel the stones up high and with a loud noise." (John I 597 1:154, ed. Lemerle 1979)

They were also used with great effect by the Islamic armies during the Muslim conquests. A surviving Arab technical treatise on these machines is Kitab Aniq fi al-Manajaniq ( كتاب أنيق في المنجنيق, An Elegant Book on Trebuchets), written in 1462 by Yusuf ibn Urunbugha al-Zaradkash. It provides detailed construction and operating information.

There is some doubt as to the exact period in which traction trebuchets, or knowledge of them, reached Scandinavia. The Vikings may have known of them at a very early stage, as the monk Abbo de St. Germain reports on the siege of Paris in his epic De bello Parisiaco dated about 890 that engines of war were used. Another source mentions that Nordic people or "the Norsemen" used engines of war at the siege of Angers as early as 873.[citation needed]

Hand-trebuchet

The hand-trebuchet (Greek: cheiromangana) was a staff sling mounted on a pole using a lever mechanism to propel projectiles. Basically a portable trebuchet which could be operated by a single man, it was used by emperor Nikephoros II Phokas around 965 to disrupt enemy formations in the open field. It was also mentioned in the Taktika of general Nikephoros Ouranos (ca. 1000), and listed in the Anonymus De obsidione toleranda as a form of artillery.[5]

Counterweight trebuchet

Counterweight trebuchet at Château des Baux, France
Counterweight trebuchet by the German engineer Konrad Kyeser (ca. 1405)
19th century French three-quarter drawing of a medieval counterweight trebuchet
Side view of counterweight trebuchet

The earliest written record of the counterweight trebuchet, much more powerful than the traction version, appears in the work of the 12th century Byzantine historian Niketas Choniates. Niketas describes a trebuchet used by Andronikos I Komnenos, future Byzantine emperor, at the siege of Zevgminon in 1165 which was equipped with a windlass, an apparatus which was required neither for traction nor hybrid trebuchets to launch missiles.[6] Chevedden dates the invention of the new artillery type back to the Siege of Nicaea in 1097 when the Byzantine emperor Alexios I Komnenos, an ally of the besieging crusaders, was reported to have invented new pieces of heavy artillery which deviated from the conventional design and made a deep impression on everyone.[7]

The dramatic increase in military performance is for the first time reflected in historical records on the occasion of the second siege of Tyre in 1124, when the crusaders reportedly made use of "great trebuchets".[8] By the 1120–30s, the counterweight trebuchet had diffused not only to the crusaders states, but probably also westwards to the Normans of Sicily and eastwards to the Great Seljuqs. The military use of the new gravity-powered artillery culminated in the 12th century during the Siege of Acre (1189–91) which saw the kings Richard I of England and Philip II of France wrestle for control of the city with Saladin's forces.[9]

The only pictorial evidence of a counterweight trebuchet in the 12th century comes from an Islamic scholar, Mardi bin Ali al-Tarsusi, who wrote a military manual for Saladin circa 1187.[9][10] He describes a hybrid trebuchet that he said had the same hurling power as a traction machine pulled by fifty men due to "the constant force [of gravity], whereas men differ in their pulling force." (Showing his mechanical proficiency, Tarsusi designed his trebuchet so that as it was fired it cocked a supplementary crossbow, probably to protect the engineers from attack.)[11] He allegedly wrote "Trebuchets are machines invented by unbelieving devils." (Al-Tarsusi, Bodleian MS 264). This suggests that by the time of Saladin, Muslims were acquainted with counterweight engines, but did not believe that they had invented these machines.

During the Crusades, Philip II of France named two of the trebuchets he used in the Siege of Acre in 1191 "God's Stone-Thrower" and "Bad Neighbor."[12] During a siege of Stirling Castle in 1304, Edward Longshanks ordered his engineers to make a giant trebuchet for the English army, named "Warwolf". Range and size of the weapons varied. In 1421 the future Charles VII of France commissioned a trebuchet (coyllar) that could shoot a stone of 800 kg, while in 1188 at Ashyun, rocks up to 1,500 kg were used. Average weight of the projectiles was probably around 50–100 kg, with a range of ca. 300 meters. Rate of fire could be noteworthy: at the siege of Lisbon (1147), two engines were capable of launching a stone every 15 seconds. Also human corpses could be used in special occasion: in 1422 Prince Korybut, for example, in the siege of Karlštejn Castle shot men and manure within the enemy walls, apparently managing to spread infection among the defenders. The largest trebuchets needed exceptional quantities of timber: at the Siege of Damietta, in 1249, Louis IX of France was able to build a stockade for the whole Crusade camp with the wood from 24 captured Egyptian trebuchets.

Counterweight trebuchets do not appear with certainty in Chinese historical records until about 1268, when the Mongols laid siege to Fancheng and Xiangyang. At the Siege of Fancheng and Xiangyang, the Mongol army, unable to capture the cities despite besieging the Song defenders for years, brought in two Persian engineers who built hinged counterweight trebuchets and soon reduced the cities to rubble, forcing the surrender of the garrison. These engines were called by the Chinese historians the Huihui Pao (回回砲)("huihui" means Muslim) or Xiangyang Pao (襄陽砲), because they were first encountered in that battle. Recent research by Paul E. Chevedden indicates that the hui-hui pao was actually a European design, a double-counterweight engine that had been introduced to the Levant by Holy Roman Emperor Frederick II (1210–1250) only shortly before.[13] The Muslim historian Rashid-al-Din Hamadani (1247?–1318) refers in his universal history to the Mongol trebuchets used at the Song cities as "Frankish" or "European trebuchets" ("manjaniq ifranji" or "manjaniq firanji"):

Before that there had not been any large Frankish catapult in Cathay [i.e. China], but Talib, a catapult-maker from this land, had gone to Baalbek and Damascus, and his sons Abubakr, Ibrahim, and Muhammad, and his employees made seven large catapults and set out to conquer the city [Sayan Fu or Hsiang-yang fu = modern Xiangfan].[14]

With the introduction of gunpowder, the trebuchet lost its place as the siege engine of choice to the cannon. Trebuchets were used both at the siege of Burgos (1475–1476) and siege of Rhodes (1480). One of the last recorded military uses was by Hernán Cortés, at the 1521 siege of the Aztec capital Tenochtitlán. Accounts of the attack note that its use was motivated by the limited supply of gunpowder. The attempt was reportedly unsuccessful: the first projectile landed on the trebuchet itself, destroying it.[15]

In 1779, British forces defending Gibraltar, finding that their cannons were unable to fire far enough for some purposes, constructed a trebuchet. It is unknown how successful this was: the Spanish attackers were eventually defeated, but this was largely due to a sortie.[citation needed]

Modern recreational use

Trebuchets are popular in modern times in a number of contexts. In particular, traditional models are constructed by historical re-enactment and living history enthusiasts, and others use the trebuchet as an engineering challenge, [16][17] or for recreational purposes.

Trebuchets are used to throw pumpkins at the annual pumpkin chunking contest held in Sussex County, Delaware. The record-holder in that contest for trebuchets is the Yankee Siege, which at the 2009 Championship tossed a pumpkin 2,034 feet (620 m). The 51-foot-tall (16 m), 55,000-pound (25,000 kg) trebuchet fires 8–10-pound (3.6–4.5 kg) pumpkins.[18]

The largest currently-functioning trebuchet in the world is the 22-tonne machine at Warwick Castle, England. It stands 18 metres tall (59 ft) and throws missiles typically 80lbs up to 300 metres.

Modern engineering thought and materials have come up with several non-traditional designs, in particular, several with "floating arms" to increase efficiency.

Principle Trebuchet Designs

Fixed-Counterweight (FCW) Trebuchets

The earliest trebuchets most often utilized counterweights affixed directly to the shorter arm. This eliminated the radically unpredictable variable of the traction trebuchet, enabling far more consistent aiming - as well as reducing the manpower required by an individual machine. A trebuchet became a far greater threat to fortifications because it could now fire repeatedly at a specific point with a relatively high degree of accuracy.

The chief liability of this design is that the formidable mass of the counterweight swings through a wide arc and its inertia can readily topple the trebuchet - posing almost as much threat to the attackers as the defenders.

Hinged-Counterweight (HCW) Trebuchets

By suspending the counterweight, rather than being mounted directly, trebuchets gained a primitive form of recoil suppression. Though still travelling through an arc, the fall of the counterweight became closer to vertical and imparts lesser lateral forces against the frame of the siege engine. In addition to greater stability, this also allowed attackers to fire heavier projectiles for greater damage or from further distances to protect the crews.

This style of machine quickly became the de-facto standard for trebuchets, utilized by the overwhelming majority of known machines since its introduction.

Arm-Over-Wheel (AROW) and Arm-Over-Cam (AROC) Trebuchets

Rather than the fixed axles of traditional trebuchets, the center of rotation for these machines move towards the counterweight as it fires - enabling the counterweight to fall almost directly downwards. As with its Hinged-Counterweight forebearers, this design better utilized the energy of its falling counterweight to impart far greater force into the projectile.

Unfortunately, this development came extremely late in the historical use of trebuchets. Much like how steam- and electric-powered cars vanished with the advent of the gasoline-powered internal combustion engine, the widespread use of gunpowder coupled with social upheavals all but eliminated sieges before this technology saw much use.

Floating-Arm (FAT) Trebuchets

Trebuchet in Denmark

A floating-arm trebuchet is an efficient modern variant. Rather than having an axle fixed to the frame, it is mounted on wheels that roll on a track parallel to the ground, and the counterweight is constrained to fall in a direct path downwards upon the release. This increases the proportion of energy transferred to the projectile.[4] This is more sophisticated than the medieval weapon, but previous designs accomplished a similar effect by placing the whole trebuchet on wheels.

Further Refinements

The recreational use of trebuchets, coupled with modern materials and manufacturing, has given birth to designs the ancients would not even recognize as trebuchets. Foremost among these is Merlin, which uses no counterweight whatsoever - the weight of the machine itself is what powers this trebuchet with an efficiency beyond the wildest dreams of medieval engineers.

See also

Notes

  1. ^ Pronounced /ˈtrɛbəʃɛt/ TREB-ə-shet or /ˌtrɛbjʊˈʃɛt/ TREB-ew-SHET; [1] also spelled trebucket /ˈtriːbʌk[invalid input: 'ɨ']t/ TREE-bucket or /ˌtrɛbjʊˈkɛt/ TREB-ew-KET[2]
  1. ^ OED, Random House Unabridged Dictionary
  2. ^ Random House Unabridged Dictionary
  3. ^ Siano, pp 5,6 and 37
  4. ^ a b RLT Industries. "The Original Floating Arm Trebuchet". Trebuchet.com. New Braunfels, TX. Retrieved May 3, 2010.
  5. ^ Chevedden 2000, p. 110
  6. ^ Chevedden 2000, p. 86
  7. ^ Chevedden 2000, pp. 76–86, 110f.
  8. ^ Chevedden 2000, p. 92
  9. ^ a b Chevedden 2000, pp. 104f.
  10. ^ Bradbury, Jim (1992). The Medieval Siege. The Boydell Press. ISBN 0-85115-312-7.
  11. ^ "Historynet.com". Historynet.com. Retrieved 2010-09-12.
  12. ^ "Historic Trebuchets – Acre 1191", IInet.net.au
  13. ^ "Black Camels and Blazing Bolts: The Bolt-Projecting Trebuchet in the Mamluk Army", Mamluk Studies Review Vol. 8/1, 2004, pp. 227–277 (232f.)
  14. ^ Rashiduddin Fazlullah’s Jamiʻuʾt-tawarikh (Compendium of Chronicles), English translation & annotation by W.M. Thackston, 3 vols., Cambridge, Mass.: Harvard University, Dept. of Near Eastern Languages and Civilizations, 1998–99, 2: 450
  15. ^ Chevedden 1995, p. 5
  16. ^ "Thelep.org.uk". Thelep.org.uk. 2008-11-20. Retrieved 2010-09-12.
  17. ^ "Wright.edu". Engineering.wright.edu. Retrieved 2010-09-12.
  18. ^ "Yankeesiege.com". Yankeesiege.com. Retrieved 2010-09-12.

Bibliography

  • Chevedden, Paul E. (1995). "The Trebuchet" (PDF). Scientific American: 66–71. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help); Unknown parameter |month= ignored (help). Original version.
  • Chevedden, Paul E. (2000). "The Invention of the Counterweight Trebuchet: A Study in Cultural Diffusion". Dumbarton Oaks Papers. 54: 71–116. doi:10.2307/1291833.
  • Dennis, George (1998). "Byzantine Heavy Artillery: The Helepolis". Greek, Roman, and Byzantine Studies (39).
  • Gravett, Christopher (1990). Medieval Siege Warfare. Osprey Publishing.
  • Hansen, Peter Vemming (1992). "Medieval Siege Engines Reconstructed: The Witch with Ropes for Hair". Military Illustrated (47): 15–20. {{cite journal}}: Unknown parameter |month= ignored (help)
  • Hansen, Peter Vemming (1992). "Experimental Reconstruction of the Medieval Trebuchet". Acta Archaeologica (63): 189–208.
  • Jahsman, William E. (2000). The Counterweighted Trebuchet – an Excellent Example of Applied Retromechanics. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
  • Jahsman, William E. (2001). FATAnalysis (PDF). {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
  • Archbishop of Thessalonike, John I (1979). Miracula S. Demetrii, ed. P. Lemerle, Les plus anciens recueils des miracles de saint Demitrius et la penetration des slaves dans les Balkans. Centre National de la Recherche Scientifique.
  • Liang, Jieming (2006). Chinese Siege Warfare: Mechanical Artillery & Siege Weapons of Antiquity – An Illustrated History.
  • Needham, Joseph (2004). Science and Civilization in China. Cambridge University Press. p. 218.
  • Needham, Joseph (1986). Science and Civilization in China: Volume 4, Part 2. Taipei: Caves Books, Ltd.
  • Payne-Gallwey, Sir Ralph (1903 Reprinted). "LVIII The Trebuchet". The Crossbow With a Treatise on the Balista and Catapult of the Ancients and an Appendix on the Catapult, Balista and Turkish Bow. pp. 308–315. {{cite book}}: Check date values in: |date= (help)
  • Saimre, Tanel (2007). Trebuchet – a gravity operated siege engine. A Study in Experimental Archaeology (PDF).
  • Siano, Donald B. (March 28, 2001). Trebuchet Mechanics (PDF).
  • Al-Tarsusi (1947). Instruction of the masters on the means of deliverance from disasters in wars. Bodleian MS Hunt. 264. ed. Cahen, Claude, "Un traite d'armurerie compose pour Saladin". Bulletin d'etudes orientales 12 [1947–1948]:103–163.
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