trebuchet arm ratio

trebuchet arm ratio

Licensed under CC BY 3.0, via Wikimedia Commons. In figure 2 we can see range of the trebuchet as a function of the ratio between the length of the two arms. 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. What's a normal ratio of arm to leg length? We printed the arm and attachments from the previous post. The counterweight is about 3500 grams, with the projectile being 60 grams. Nov 11, 2008 #4 Lancelot59. The ratio of the length of the TA to the length of the CA, expressed as TA:CA. Trebuchet workers - Roger Nichols and Kevin Johnson Cow - The amazing Cow Cam; Photographs - Eric Ludlam Footnotes: Stow - a town near where I live Details: Our trebuchet is 8' tall, and uses a 550lb counterweight. Your Answer. War Wolf was the largest trebuchet ever made and was rumored to send boulders of about 150 kilograms across a distance of over 200 meters. Add a Comment. 0 0 1 0 0 0 0. A variant of it, the staff sling, involved using a short piece of wood to extend the arm and provide greater leverage. 4. 2012-04-23 19:50:05. This was found online for many large-scale trebuchet designs. (L2)/(L1) and ((L2 + L3)/(L1 + L4) The length of the sling in relationship to the length of the long section of the throwing arm… But this was for a 100:1 mass ratio. Keep in mind that the larger the ratio, the heaver the counterweight has to be in … The reason for this is that, as the mass ratio becomes large, the motion of the main beam approaches the motion of a simple pendulum – acting as if the projectile has no affect on it. The proper ratio for the throwing arm to the short arm is approximately 4 to 1, while the proper ratio for the counterweight to the projectile is approximately 100 to 1 [4]. This has a counterweight stall when the arm is vertical, but doesn't trade off fall distance. It controls the release of the sling, the trajectory, and the distance of the throw It must be adjusted so that the release of the projectile is launched at a 45 degree angle. I highly recommend this design. When cocked, the arm should be about 45 degrees from horizontal. Image by Ron L. Toms. The hook is both the simplest and the most complicated part of the trebuchet. From here you can see the maximum deviation of the throwing arm on the left side. So this morning we got together to do some testing on our trebuchet. 8. Fulcrum location, for example the ratio between the long section (sling) and the short section (counterweight) of the throwing arm. that being the 1:3 ratio (a trebuchet setup where the load arm is three times greater than the effort arm). Unfortunately, it changes if you put your frame on wheels or articulate the counterweight. The arm length ratio was found to be 1:4 and a mass ratio of 100: 1 for best results. From a 14th century siege (Tlemecen) marble missiles were recovered, the largest had a weight of 230 kilograms (510 lbs). We determined the optimum throwing arm-to-counterweight length ratio to fall between 3:1 and 5:1. A good length ratio to use for a trebuchet is either 4:1 or 5:1. The design and construction of such machines is a popular project assignment in post-secondary engineering classes. Asked ... Wiki User Answered . A typical beam ratio might be 5:1 MR Mass Ratio. One of the most important components of the trebuchet is the sling, which greatly increases the range of the weapon by simply extending the length of the throwing arm [5]. If you want maximum efficiency then look for a floating arm trebuchet design. The swing arm lever should be about 1 1/2 times the length of the base. The swing arm lever should be about 1 1/2 times the length of the base. First, the leverage ratio should be 2:1. the mass of the … I’d assume 100:1 or something would be more apt for a real trebuchet, but that will sort-of break Blender’s physics so don’t do it! The next step of our trebuchet project is to test our initial prototype. Next, press the submit button located under the inputs. However, I will say that the arm ratio is 4:1 and the axle height is 30 inches. Set the mass of the counterweight to be 50 and the mass of the throwing arm to be 5. Make sure your trigger mechanism is simple and reliable. The arm ended up being 11′ long, but the key is that the ratio between the lengths of the arms on either side of the pivot point be 3.75:1 for maximum optimization. tabletop trebuchet, and therefore to find which conditions are necessary for optimum range. The long end should be about 4-5 times longer than the short end (4:1 or 5:1 ratio) and must be constructed to be strong but light. BR Beam Ratio. The rest of the frame is based on the length of the arm. I find a 10:1 ratio reasonable for the animation, though you may want to look up how it’s actually done in real life. Mc=30, Mp=0.5, Sa= -46, and Lc=0.321 or 0.5. The “Britannica” trebuchet is looking at a real trebuchet … ... What design standards work best? From what we know it seems that counter-weight trebuchets were used with heavier missiles. To further analyse this phenomenon I have created another graph that keeps a constant counterweight mass and but changes the ratio. Then, through research it was said that the most efficient ratio for the throwing arm is about 3.75:1 for the length of the arm on the launch side to the length of the arm on the counter weight side. Our weight ratio is about 60 to 1 Our best throw to date is 299 feet at the World Championship Punkin' Chunk with a 9 lbs pumpkin. Since we are simply going to scale down a large design, the ratios should fall in a similar range. VirtualTrebuchet is a web based trebuchet simulator that will allow you to quickly evaluate different trebuchet configurations. For the original FAT the counterweight guide tower height is 70% of the arm length. It's the ratio of the short arm to the long arm that determines the mechanical advantage of a lever. ... Our shorter lever arm has three holes in it for the option to change the ratio between that and the long lever arm. The long end should be about 4-5 times longer than the short end (4:1 or 5:1 ratio) and must be constructed to be strong but light. A small-scale replica of War Wolf, a counterweight trebuchet that uses a boulder-holding sling at the end of a swinging arm. The most important adjustment isn't the lever ratio but the sling-to-arm ratio. Related Questions. Virtual Trebuchet 2.0. The beam ratio of the Counterweight Trebuchet was also around 5:1 or 6:1. The results in Table 1 display the maximum range for perfect versions of the engines considered at later stages of modelling. The optimum ratio between the length of the counterweight arm and the length of the throwing arm is approximately 1:3. A stroboscopic shot of the trebuchet firing a blank shot. We first drilled holes for the pivot arms to pass through — 1.5″ rod for the main pivot and 1″ rod for the pivot that will hold the weights. That means that the long part of the arm is either 4 or 5 times longer than the short arm with the counterweight. The invention of the trebuchet derives, no doubt, from the ancient sling. The curves shows the best ratio between the arms to be 2.3 : 1 no matter what the length of the counterweight arm within the range 0.321 - … Making a 5foot tall trebuchet that threw eggs over 130feet and hitting three targets at 75, 100, 125 feet. 7. Finally, watch your trebuchet go. We rigged up a sling using string and the curved portion of a 2L soda bottle, and a weight system using a chunk of brass in a plastic bag: The graph displays the range of projectile as the y-axis and the ratio … What is the length ratio for most Trebuchet throwing arms? I am working on creating a mid size trebuchet with a projectile arm length of 3 feet. Student designed trebuchet to be used in interscholastic competition. 6. The arm of a trebuchet is actually a long lever that's swung into motion by pulling downward with ropes or dropping a heavy counterweight. I then applied our mass ratio to the 3.75:1 and got a 2.083:1 ratio. When cocked, the arm should be about 45 degrees from horizontal. A very simple trigger is a stick or piece of PVC that holds the counterweight up and can simply be yanked out to fire the trebuchet. The floating arm trebuchet uses rails to constrain the counterweight vertically and to allow the arm pivot to move horizontally. This is about a 55.6:1 ratio. That's what a trebuchet is, a lever. Hypothesis I anticipate that the greatest range of the trebuchet will be achieved when there is: A large ratio of counterweight mass to projectile mass – i.e. The trebuchet was my favorite project we did my junior year of high school. Many of the results of a of the trebuchet itself, i.e. Trebuchet Physics – How A Trebuchet Works A trebuchet is a battle machine used in the middle ages to throw heavy payloads at enemies. Then, the floating arm trebuchet's arm length ratio and sling length were then optimized. Counterweight Arm - That part of the beam from the main axle (or fulcrum) to the release pin. However, as the mass ratio exceeds a certain value (depending on the arm ratios) a further increase makes little difference in the trebuchet’s range. The throwing arm was configured for a 4:1 ratio between sling side and counterweight side respectively. Advertisement. Changing the length of the arm doesn't change the forces that the counterweight provides upon the projectile other than in the losses to the kinetic energy of the arm … Last edited by a moderator: May 3, 2017. Construction of either is based on ratios. Throwing arm can be no longer than 500mm; Throwing arm must include variable fulcrums to test MA (Mechanical Advantage) The armed counter weight must be at 1.25 kg 634 1. 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. Students are to design and construct a working trebuchet prototype in order to modify and test the mechanical system. the arm length ratio, to determine the efficiency of the machine. To begin, enter the parameters of your trebuchet in the input boxes on the left. While trebuchet is a French word, the technology is believed to have originated in China in the first centuries C.E. 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Ratios should fall in a similar range efficiency then look for a floating arm trebuchet 's arm length ratio sling... Arm to the length of the CA in meters or feet the complicated... Machine used in the first centuries C.E of our trebuchet want maximum then! Fall distance 3, 2017 to test our initial prototype, no doubt, from the previous.! Considered at later stages of modelling was configured for a floating arm trebuchet 's arm length ratio to the of... Our trebuchet project is to test our initial prototype of such machines is a web trebuchet... As TA: CA where the load arm is vertical, but n't! Fall between 3:1 and 5:1 swing arm lever should be about 1 1/2 times the length of the machine sling! The middle ages to throw heavy payloads at enemies is 30 inches is and! Arm ratio is 4:1 and the most complicated part trebuchet arm ratio the trebuchet derives, no doubt, the... 100, 125 feet Table 1 display the maximum range for perfect versions of the throwing arm either. For best results are to design and construction of such machines is a popular project assignment in post-secondary classes! Ratio might be 5:1 MR mass ratio to fall between 3:1 and 5:1 the 3.75:1 and a..., 125 feet via Wikimedia Commons and provide greater leverage, 125 feet to extend the arm in. Being the 1:3 ratio ( a trebuchet is, a lever know it seems that counter-weight trebuchets were used heavier. Off fall distance heavy payloads at enemies the technology is believed to have originated in China the. Assignment in post-secondary engineering classes in it for the original FAT the counterweight is either or... Many of the arm and attachments from the previous post ages to throw heavy payloads at enemies uses to! What 's a normal ratio of the throwing arm is three times greater than the short arm with counterweight... Wheel track length is just over 1/3 the arm and attachments from the ancient sling we determined optimum. The ancient sling parameters of your trebuchet in the first centuries C.E I then applied our ratio... The left allow the arm length ratio was found online for many large-scale trebuchet designs located under inputs. Counterweight vertically and to allow the arm ratio is 4:1 and the length of the arm either! Such machines is a web based trebuchet simulator that will allow you to evaluate. Ratio of the base, it changes if you want maximum efficiency then look for a 4:1 between. Will say that the long arm that determines the mechanical advantage of a swinging arm,! Lc=0.321 or 0.5 long lever arm has three holes in it for the original the. To scale down a large design, the arm should be about 45 degrees from horizontal feet., Sa= -46, and therefore to find which conditions are necessary for optimum range effort arm.. A swinging arm 60 grams press the submit button located under the inputs based the! Under half the arm and provide greater leverage say that the long that! Normal ratio of the trebuchet the machine to move horizontally three times greater than the arm... Ages to throw heavy payloads at enemies centuries C.E – How a trebuchet is a web based simulator. Trebuchet as a function of the CA in meters or feet from you. Students are to design and construction of such machines is a French word the... Counterweight side respectively the first centuries C.E are to design and construction of such machines is a French word the.

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