There was a few different steps in the building process of our trebuchet. First, we had to make sketches on graph paper consisting of a Front, Top and Right side view; we then had to dimension these drawings so we knew how big it was going to be and that we had enough material to build the trebuchet. Next, on a piece of graph paper we scaled our four 2X4’s and used our scale to measure where each of our cuts would be at. After, all of the drawings we went down and cut the boards in about a day. Then, when we started building out trebuchet we started with the base we connected the boards using butt joints and we then screwed these in. We actually used butt joints for the entire trebuchet. We then drilled holes in our (arm legs) for the metal
In the competition known as Science Olympiad, there is an event build called “Boomilevers.” This event is comprised of building a structure to be attached on one side to a wall and bear the maximum weight possible on the other side, while the structure itself weighs as little as possible. The Boomilever is a long standing Olympiad Event and requires acute attention to detail and a critical mind in architecture in order to achieve the maximum efficiency score possible. There are many limitations and guidelines set forth in the Olympiad rules, defining how tall and long the boomilever must be and how the boomilever must attach to the wall. This leads to construction much like a real life situation, where resources must be utilized efficiently.
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.
There are two main things that can be used to secure joints: balsa cement or cyanoacrylate glue. Before gluing two pieces together, lay them out on a work board or wax paper and use pins to prevent the members from moving apart; the pins should not be placed near the joints so that it is easier while gluing (Anderson 2006). Then, apply the glue to the members and make sure that they touch to create the strongest joint possible. Despite it seeming as if more glue would make a structure stronger, using bulks of glue can cause the bridge to fail as cyanoacrylate bulk will cause the joint to become more brittle (Anderson 2006). To prevent excess gluing with cyanoacrylate, a special glue applicator should be used to minimize the amount of glue added to the wood, and to increase strength with balsa cement, thin the glue out first by making the solution 30% water. This process will be utilized when constructing the bridge to ensure that the joints are sturdy enough to withstand weight and won’t be the cause of failure.
In Beth Johnson’s story,” Bombs Bursting in air”, She speaks about being shielded by ignorance when you're young. As you get older, you realize how bombs start to impact your life and the lives around their detonation points. You start to love immensely and be thankful for what you have after a close call. A great lesson to learn from her writing: Love while you can, Enjoy life day by day because you never know when a bomb can detonate and destroys everything you hold dear. Live with no regrets, if you live true from the start. The day my son was born was my bomb that impacted directly and sent shockwaves through my life. I learned the lesson first hand. It changed the way I think of situations and changed the route of my life all together.
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.
Then I attached the “steps” to the milk crate. The steps will hold the base of the ratapult at a 25-degree angle. I attached the “steps” by drilling holes in the bottom of them and then tying them to the milk crate. Then I nailed the board with wallpaper into the back end of the base. The base was then nailed into the “steps”, and glued grass decorations and cardboard cows to the base. The ratapult was completed.
The word trebuchet comes from the French word that means “to tumble” or “to fall over,” which is precisely what the trebuchet aims to do (Farrell, 2006). The trebuchet catapult first began appearing in the 6th century (“How to Build”, 2012). However, these early trebuchets were powered by humans pulling on ropes in order to lunch a projectile. What we would officially recognize as a trebuchet that uses gravity acting on a counterweight to launch a projectile started appearing in the 12th century (“How to Build”, 2012). Trebuchets were invented because castles,
The purpose of the projectile lab is to test the validity of the law of conservation of energy. The application of this law to our everyday lives is a surprisingly complicated process. Conservation of energy states that energy cannot be created or destroyed, but that it can be transferred from one form to another. Consider the projectile lab from document A that this essay is based upon. In an ideal experiment, the projectile is isolated from everything except the gravitational field. In this case, the only force acting on the particle is gravity and there are only two forms of energy that are of interest: the energy of the particle due to its motion (defined as kinetic
Trebuchets earned a reputation for being much more accurate and precise than their onager and catapult counterparts. Not only was this accuracy a benefit, but being based on rotational motion and leverage rather than torsion (spring power) and lacking in a throwing arm stop, the trebuchet proved a much safer alternative for the personnel operating it. Onagers and Mangonels would literally explode on occasion when the torsion proved too great or a crack developed in the throwing arm due to the rapid stops it experienced.
The Trebuchet achieved its deadly accuracy due to the components that made up the trebuchet. The materials used to build a trebuchet were often fairly common, but the materials were used in bulk and this made the trebuchet costly to build in terms of resources. The materials often used were wood, sand and stone, it often took engineers and builders days to build the trebuchet. The heavy nature of the trebuchet made the device very difficult to move; therefore mobility was a massive issue in using trebuchets in the middle ages. However only one trebuchet was needed to damage an entire wall of a castle due to the high accuracy associated with trebuchets. It is estimated by historians and statisticians that trebuchets had an 84.56% success rate. These points link back to the main statement that the trebuchets were highly accurate siege
...e went into motion. Possible projectiles of the trebuchet were living prisoners, jugs of Greek fire, rocks, and animals. Another large weapon of siege was used primarily in storms, the battering ram. In its early stages, the ram was no more than a hefty beam with a mass of metal attached to the end. Men would hoist the cumbersome boom onto their shoulders and run into a wall or door as many times as needed until the surface under attack gave way. In the Middle Ages, it was developed into more of a machine, for the ram hung from the center of a tent under which the men operating the ram could hide. The ram could be swung like a pendulum much more easily than having to constantly run back and forth. Also, castle guards often poured hot oil or other things onto the ram and its engineers. The tent, which was on wheels, protected the men and the battering ram as well.
...orking trebuchet of medieval design today is at Warwick Castle, which is used as a tourist attraction and is fired by members of the public under professional supervision. It stands 19m tall and uses a 6 ton counterweight to fire 15kg stone balls distances exceeding several hundred feet. A modernly designed trebuchet, called T-Wrecks, can throw pianos weighing 250 kg over 100 m. In England a group of farmers threw a car close to 122 m and a 55 gallon drum filled with gasoline over 300 m.
A mallet and sharp blade would be used to split the wood, which would then be smoothed with a knife, or dressed, so that each piece would lay
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
Place the three foot long pieces of steel rod exactly 4 ft apart and hammer into the ground approximately 12” deep (making sure no underground gas lines or electrical wires are in your striking path). Place each 4 ft length of PVC over the rod that remains above ground. Mark each piece of PVC with the competition jump heights. Slip each conduit clamp over a section of the (now upright) PVC and tighten at the needed jump height with the mounting hole facing the exit side of the bar jump. Bolt each conduit strap, with the 'hook' facing out, to the mounting hole of the clamp. This forms a rest on which the jump bar will sit. Rest the 5 ft length of PVC on the conduit straps. Decorate bar with strips of tape. You have just assembled a homemade bar jump. Optional: Add additional clamps and straps so that you may have more than ...