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Notes about trebuchet
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The trebuchet was capable of taking down castle walls, fortresses, and entire cities. They were used as an ancient war engine in the early 300 B.C. in Ancient China. The trebuchet reached Europe in the Middle Ages, in the year 500 A.D. It was originally primarily used by the French, and were temporarily used as a power source. It will later be used as a weapon, introduced to England during the Siege of Dover in the year 1216. The trebuchet was used to take down the Dover castle's walls in this Siege. Trebuchets are torque based launchers, using an arm with an attached form of sling and a counterweight to throw a given object further than the traditional catapult. The counterweight must be much heavier than the payload, or the object being launched, in order for the launch speed to be quick enough for the projectile to reach its target. One end of the sling will release when the projectile is over the counterweight, and as a result, the payload is released and has begun its flight to its target. A trebuchet consists of a pivot point, an arm, a sling, counterweight, and a stand. The arm is attached to the pivot …show more content…
The sling will be 18 inches, or the length of the longer end of the arm. I will use a metal pivot point, in order to keep stable and support the weight of the counterweight. The counterweight will be 4985 grams(13 pounds), or approximately 133 times heavier than the payload, which is 45 grams, as according to Siano’s optimal factors of the Trebuchet. The sling will be a string, fully attached on one side, but only a loop around a rod to be released at the optimal release location of 45 degrees to the vertical. Also, the pivot point will be elevated to a height of 1.5 feet, with a sling that is 1.5 feet long. The weight of the arm is projected to be 0.5 pounds, in order to maximize the distance of flight for the golf
There are many technicalities and terms associated with a successful device. Some of the main factors come from the materials used, and where they were used in the structure. Some are best used in one place, or another. All of this must be taken into consideration when deciding on how to best utilize the physics and forces applied to the boomerang. As it is a simple machine, it dominates in simplicity for a somewhat daunting task.
CATAPULTS The catapult, was invented by the Romans, and plays a large role in the siege of any castle. Besiegers could fire 100-200 pound stones up to 1,000 feet. The catapult was used to destroy buildings and walls inside and outside of the castle walls, it could also destroy an enemies moral by throwing severed heads of comrades, they could spread disease by throwing shit and dead animals in, and they could destroy wooden building by throwing bundles of fire in.
First the energy of conservation. The setting of the trebuchet before firing is shown in Fig 1. A heavy counterweight of mass (M) (contained in a large bucket) on the end of the short arm of a sturdy beam was raised to some height while a smaller mass (m) (the projectile), was positioned on the end of the longer arm near or on the ground. In practice the projectile was usually placed in a leather sling attached to the end of the longer arm. However for simplicity, we shall ignore the sling and compensate for this omission by increasing the assumed length of the beam on the projectile’s side. The counterweight was then allowed to fall so that the longer arm swung upward, the sling following, and the projectile was ultimately thrown from its container at some point near the top of the arc. The far end of the sling was attached to the arm by a rope in such a way that the release occurred at a launching angle near the optimum value ( most likely by repeated trials) for the launch height. The launching position is shown in fig.2 where we have assumed that the projectile is released at the moment the entire beam is vertical. In the figures: (a)=height of the pivot, (b)= length of the short arm, (c)= length of the long arm, while (v) and (V) are the velocities of (m) and (M), respectively, at the moment of launching.
The earliest model was the trebuchet. It started by using a large weight on one end of a pivoting arm. The arm was pulled back the missile was placed and then let go. The weight went down, the arm went, and the missile launched. The later model gained its power from a tightly wound skein of rope, hair, and skin. the skeins were twisted incredibly tight and then had a wooden arm up to sixty feet long placed in between them. The arm was pulled back using pulleys and rope, the missile was placed in the wood cup and then the arm was released. The arm sprang to a 90 degree angle where it was stopped by a large padded piece of wood. The arm was then brought back down and fired again.
According to Chevedden et al., (2002) the Latin word for trebuchet was “ingenium” and those who designed, made and used them were called inginators. These early engineers kept modifying the trebuchet to increase the range and impact force. One of the improvements engineers made was varying the length of the sling ropes so the shot left the machine at a ? angle of 45 degrees to the vertical (shown in the figure above), which produces the longest trajectory (Chevedden et al.,
The word trebuchet originated in France, but contrary to the name, the early siege weapon actually originated in China. The original trebuchet was made in 300BC. The trebuchet was made as a way to attack over enemy walls or fire at large groups of enemies running at the user. The Chinese had a design in which good ol’ fashion man power was used instead of a counter weight. There weren't very many advancements in the Chinese trebuchet besides the use of different woods. This trebuchet tended to be the least accurate out of all of the other models. This model is known as the traction trebuchet.
There are some video crew members who use square tubing, angle irons and some creativity in order to create makeshift jib crane. They attach the counterweights using zip ties then mount the device on a simple tripod.
The engineering of a trebuchet was vastly improved over time, but was only due to our past ancestors wanting to use a trebuchet over a catapult because it is able to launch over longer distances and be more accurate. Many changes have been made to the trebuchet since the 12th century when it was first introduced by Christian’s and Muslim’s. They both used this to throw objects up to 90 kg for about 300 meters. They would use these weapons to throw heavy objects into forts and bunkers. Many armies still used these up through the 15th century, the ironic part about this is that gun powder was made and used at the beginning of the 15th century. The First trebuchet was referred to the “Traction Trebuchet”. This type of trebuchet was based around man’s strength; it would have
The trebuchet is used with a long wooden arm refreshed on a hinge point, which acted as a big level. A bullet was placed on one end and soldiers in this earlier form of the trebuchet pushed on slings devoted to the other end to fundamentals swing the arm around and throw the
The English used the Welsh Longbow first against the Scots and then they saw how good it worked so they used them and brought along guys to use them to defeat the French. B. The longbow was more effective thus using the old crossbows they had used before. 1. “ The longbow was a simple yet highly effective device that had greater range than the crossbow and could be fired at unprecedented speed”
A cantilever is a beam fixed at one end only. They are often used in
The History Channel also says, “Like a catapult, a trebuchet hurled a heavy projectile toward a target. However, like a seesaw, a trebuchet was a counterpoise engine: a weight at the end of one arm powered the machine’s throwing action.” In conclusion, the movie “Kingdom of Heaven.” There were many things like the invention of the longbow. Then there were things like the relationship between Balian and Sibylla, that weren’t true.
Throughout the years, there have been many different forms of weapons used by the military. One type of weaponry that has failed to be used in modern-day military is a catapult. Catapults are very useful, if there is not a desired accuracy only a general direction in mind. One catapult that has recently been built and destroyed is called, “The Whatever,” created in Mr. Kunz’s sixth period Physics class by Brandon Jones and Jenna Lund. The name of the catapult fits the varying accuracy of the catapult though through testing of the angle of release, angle of launch and the position in which the object that would be projected forward would set.
Projectile motion is the force that acts upon an object that is released or thrown into the air. Once the object is in the air, the object has two significant forces acting upon it at the time of release. These forces are also known as horizontal and vertical forces. These forces determine the flight path and are affected by gravity, air resistance, angle of release, speed of release, height of release and spin