Simulator. Use a wrench or hopefully a driver of some sort to drive the CW bolt all the way throughone drop channel, through the arm and out the other drop channel. WebFloating Arm Trebuchet - Hobbyist Version The F.A.T. Just as a reminderremember to add glue I used the trebuchet frame as a fulcrum to lift it in the air. Keep in mind that the rails should be unobstructed, and the gap where the weight bar will go should be small enough that your wheels can easily glide over it. 16. The oddity with this trebuchet is that it has no arm ratio as the counterweight sits at the very end of the arm, and the arm itself tends to be shorter. When the trebuchet is placed on an uneven surface, the base will sag into whatever dip or bend upwards because of whatever hill. Now comes the moment of truth. Best catapult ever (98 ft) Load more 3D Printer Info. Diagonal Track supports. Use three screws in every place that the diagonal touches the track or support. these are the trigger pins If the weight is very heavy, the long part of the arm can Use the order of bolts and washers on either side shown in the first picture (From inside to outside the order is) : drop channel, washer, bolt, washer, CW box wall, Washer, bolt, Bolt, washer, wall of CW box, washer, bolt. Awesome trebuchet! WebA floating arm trebuchet's arm is mounted on wheels that roll on a track parallel to the ground, with a counterweight that falls vertically, allowing for greater efficiency by increasing the proportion of energy transferred to the projectile. Sorry I haven't responded until now. I will be modeling my trebuchet after your and would like to know Can the trebuchet launch a 2-lb dumbell? But I'll try. And back up at least 20 feet when firing (The sides are safest) Arm-sling constraint, arm on fixed roller, projectile above ramp. I've uploaded PDF's of the CAD drawings as well as a general schematic diagram for an f2k. I'm using this kind of trebuchet for an assignment, and the ratio of our weight to out projectile is about 1:200. would this kind of trebuchet be better in this case than a traditional trebuchet? it's smoother, faster, and prevents grooves from wearing in the wood. Try to make it as flat and planar as possible, as this will minimize the need for adjustments later. Have fun and be safe. look in improvements, may need to be changed It will be harder to split or break the wood. Finally, thread your sling lines through the hole on the outside of the seam to the back, and then through the back to the front. A mortise and tenon joint would have also probably worked. (I saw a car roof get crushed by a pumpkin flying backwards)Use a long trigger rope and keep yourself at a safe distance.Have fun. simplest step. Then, using the claw hammer, hammer out these slivers of wood. This time, It's half the depth of 1 2 x 4, which is 0.75 (3/4) inches. These are the horizontal beams that are used as the track. Cut a piece of steel pipe for an insert and place it at the center of each form, then pour the concrete. I forget what you are supposed to do next Additionally, I would make the arm as long as possible as well. Make sure that there are no cracking noises or flexing from the joint. This is it. (I had no idea what else to finish it off with. Reply 10. This is the only part of the trebcuhet that can vary a lot. You will need the denim and the monkey-  no, sorry, gorilla tape. You also nee You only want enough of the bolt so that after it comes out of the arm there is only enough room on either side of the bolt for a 3 washers, 2 bolts and the entire wheel assembly. Reply I'm still not sure. so i need to cut length of everything down to size. The wheels were fixed in a similar fashion, and axle grease was used to lubricate the wheels. I would get more in case some of their heads strip (0.635 cm) diameter, 5.5 in. Look at the second clip of the video for the safety "demonstration" (We accidentally left it in) If this happens, use it on a hill or place two very thin pieces of scrap wood under the base, directly under the drop channels. (8TH picture) Then tape them in place. Without one of them , the arm would simply fall into the ground. Our arm was made of many pieces of layered plywood held together with resin and deck screws. Now you simply lay the 6 ft pieces across the supports, lining up the edges, and drive three of the 2.5 inch screws into through the track and into the supports. Remember, though, that if your short arm is shorter you will need fewer bolts. cut about 6 inches from the edge, along the 7 ft. arm. Measure the distance from the outside of one track support to the outside of another; do the same at the top. diameter threaded rod, coarse thread "Illinois Institute of Technology students build catapults to toss pumpkins", "Pumpkin Festival aims to be bigger and better", https://en.wikipedia.org/w/index.php?title=Floating_arm_trebuchet&oldid=1126960959, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 12 December 2022, at 04:31. These are the trigger pins. First of all you need two people on Step 15, This is stellar. Measure the amount of space in between the drop channels. This ring will be what loops around the pin. Yes I want a small one for the classroom and large one for the field. I may or may not fget a response considering it is 2013 and not 2010 but I need to build a trebuchet for my physics class and i came across your model and had a few questions. That is to say, you should make sure your drop towers reach the full length of the 80 meter height. the short arm is the 1 (In the ratio) and the long arm is the 3.5 (in the ratio) -3.5 times longer than the short arm. 7 years ago I haven't seen much information on dynamic tuning for the f2k, but we did an estimate of the static loads at the critical points and kept the stresses around 1/4 of the yield strength of the steel.I'd also advise implementing a metal sheet on the rails, instead of bare wood. Our sling (not pictured, there is a shot of it in the video) was made of woven nylon web straps. I might include them later. They're probably correct, I'm just letting you know. 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 And it is constructed with 1 X 6s 1. pretty simple step. 5. The first recorded use of traction trebuchets appeared in ancient China and were probably used by the Mohists ps-mohist are a scientific lead version of the chinese What is the floating arm Trebuchet, and how does it work? For the trigger you will need the: Place the hole for the counterweight bolt about an inch and a half from the end. When the beam has cured, trim off any excess wood to make planar surfaces, and sand off the excess resin. (1.5875 cm.) um.. 13. (Left or right) SECOND PROBLEM This will take some effort. The CW bolt MUSTbe made thicker and stronger, otherwise it will bend and cause problems. ) The frame is made from 12mm diameter square cross section pine (I used a about 2.4m). Upon releasing the trigger, the counterweight is allowed to drop through the channel. i was hoping you could tell me what the release system was rated for and if you have any recommendations on where i can acquire a quick release, 8 years ago But make sure you go to the website for wheels that I recommended in the Instructable to avoid paying too much for wheels. Line them up so that their 1.5 inch edge is adjacent to the edge of the 2 ft 1 X 6, and so that their 3.5 inch edge is on the outside cut edge of the long 1 X 6. Alternatively, you can attach a heavy weight such as a 20 pounds (9.1 kg) hand weight directly to the end of the arm. 1. If you want the diagonal to go exactly 1 foot out and 1 foot down from the corner, you need a more precise measurement, it's something like 1.41 feet. Once everything is square, true, straight aligned or whatever you feel like saying, We can put this beast together. Hey I just made that up right now. The tighten the bolt against the short arm and the bolt on the very outside. Reply Lay them on top of one another, making sure the edges line up. The original floating arm design originated in modern times, from professional and hobbyist engineers for recreational and educational use. The first picture shows what this looks like. The person on the trebuchet needs to push back on the arm so the person on the ground can reach it. You may want to keep the weights out while you are doing this. The arm is split into two parts by the fulcrum. 2 segments of 1 ft., 0.5 in. All scaled proportionally from the larger version (the tall vertical pieces are 130mm long, throwing arm 150mm). y Test 3: When the trigger is released and with the arm slightly As far as we know, its the largest floating arm ever built by youths, and the largest wooden floating arm trebuchet in existance.The arm is 18 feet long, we use a 1.5 inch steel bar, and can load it up to about 800 pounds. I would still recommend that you read through the list, and buy the lumber as you need it to avoid wasting wood. 10 1/4 in. On the end of the arm, there will also be a nail, or some sort of strong metal pin. 10 ft. (3.048 m ) of gorilla tape Just find a pair of old jeans Our shafts were steel bar. long carriage bolts If not, just measure the distances on each piece as accurately as you can. Make sure all the hardware can support whatever CW you are using. *look at the last step, improvements. However, a floating arm trebuchet is more efficient when built to a size of between one meter and five meters,[5] making it suitable for hobbyists and model builders. The placement of these pieces is shown in the sixth picture. Cut these two twisting braces at around 1 ft 2 inches because the length of these will affect the width between the tops of the two drop channels. Did you need to do anything special with the scaling? Yeah, this happened to me. 7. simplest step. grab the last 3 ft, 6 in 2 X 4s. Line the short edge up with the 8 ft piece of the drop channel. They have the same orientation a The more you pull the edge over the other one, the deeper the pouch will be. 6 1/4 in. [3] If you Take off the drop channels completely so you can cut through here. I have to make a Trebuchet for my Engineering product, and it must be no more in height than 80cm, so what do you think are the best dimensions and ratios for it? 1. 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 Taper the arm from a full 3" at the axle to 1" at the finger end of the arm (Fig. Axel for the masses is coathanger wire but ensure the axel never absobs the full impact of the falling masses as it will bend. Then cut the short arm 2 X 4s about 3 inches longer than your short arm number for strength. Long sides of the base You also will need to push them out slightly, so that the gap is 3/4" at least. WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. Posts : 9,606. but if you didn't (my bad) You need to recut the drop gap to 1/8" wider than the CW bar, cut the gap in the track slightly wider, and spread apart the track supports directly underneath the drop gap. Remember to shorten the short arm pieces if you are using a larger ratio that will need to make it shorter. We'd have done much better with something like this. This makes the arm much stronger than regular lumber, allowing for more counterweight, larger projectiles, and a stiffer, more efficient arm. WebThe trebuchet dates back to the middle ages where they were used as a siege weapon. None seem to affect it structurally, but we'll see. Slip the ring over the pin, and stretch the sling lines to get rid of as much slack as possible. Have someone stand on the front half of the trebuchet. Cool ring Finally, thread the Axle through the other hole in the middle of the arm. We made ours so that the chain had a tiny bit of slack in it initially, which we took out by tightening the nut on the eye bolt each time we fired. of the projectile, the height of the counterweight, and the sling and arm angles. 6. Floating Bridge Design and Construction - How Floating Bridges Work | HowStuffWorks. A good way to estimate the range is to use conservation of energy. But I'm sure you'll get the idea. i just copied that Fairly simple trigger design. Thanks for writing this 'ible. 11 years ago The arm is done. And do lots of testing, with a realllllly long trigger string. grab the last 3 ft, 6 in 2 X 4s. Again, cutting these pieces shorter will narrow the track and cutting them longer will widen it. ALSO, the base boards (I used 1 X 6) should be thickened. Also use a continuous, smooth metal ring Without the other, the tracks may not be aligned or the width of the drop channels might narrow or widen (Not staying even= bad) Consider cost and use whatever spare or donated materials you can find. So if I could toss the weight a 100yds would be perfect. Use a wrench to thread the threaded rod through the holes you made..make sure it fits and is level. Tape measure, ruler http://youtu.be/MS9OepeTELc, Reply Just on top of the tracks. We're all a bit nerdy and geeky and figured a weekend engineering challenge was a good way to make camping and drinking more awesome. I don't know what gauge mine was, I found it in the trash Buy one that is at least 4 inches. It takes awhile to calibrate the different lengths and ratios to reach optimal firing capabilities. Then just hammer the dowels all the way into the holes. The seam will help prevent the string from pulling through and takes all the force of the swinging pouch. It needs to fit completely on the bolt. (6.35 cm.) Grab your nylon rope and cut 4 feet off the end. Finally, tie the keychain ring to the slightly shorter rope. Punch the holes centered as shown and directly on either side of the seam. 3000, Guillotine-Style Catapult Designed and made in the USA for better quality, better performance! Make a square line across the flat side of the board. Lean the supports in towards the drop channel as they go up so they don't slip out. wood screws, phillips head drive, #8 We had initially planned for around 500 lbs load, but were able to use gym weights and get close to 800 lbs without damaging the shafts.Our design required that we load each weight one at a time onto the weight bar using ladders. Did you make this project? If I need to bring the scale down, what would the dimensions be? You do not want this side to come undone, so make sure it's tied tightly to the end of the arm however you can. excellent site for cheap, strong wheels http://www.thecasterguy.com/ It's a little bit tricky to get the angles perfect. This is the hardest part of loading. Otherwise, the washers in between the CW box and the channel will be smooshed up against the drop channel, creating friction, which is bad. ratio of counter weight to projectile about 90 to 1 weight. I just so happen to be in the construction phase of an improved floating arm trebuchet. 22. still thinking. Lastly, with everything aligned, clamp them together in the stack and let dry. Thanks! 4. Our weights were 18" diameter and 4" thick, weighing 80-90 lbs each. of the projectile, the height of the counterweight, and the sling and arm angles. 6. Feel free to use them for educational or personal use. Then, use the sander to sand it down flat and smooth. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 5.5 in (0.2413 X 0.1397 m) Although the trebuchet will work so small, it might be better to increase the arm ration. [5], A floating arm trebuchet has three points of contact where friction can interfere with efficiency. Since one is steeper than the other, this meant that the vertical height ended up different. The third clip in the video shows this problem well- the arm kind of rolled over and on top of the guide blocks because they were too high. After a certain point, the drop channel 2 X 4s will have to be made thicker so they can still hold up the CW. They would at the very least be a good guideline. Fill the bucket with rocks or heavy pieces of metal. If you have a router, it would be easier to do this by just cutting away the material. with that. Make sure the gap is aligned with the supports and the gap in the drop channels. 15 in. thank you very much. 3 segments of 3 ft (0.9144 m) long 2 X 6 However, if you want to do something fancy that is attached to the trebuchet (you won't have as much aiming ability) You could nestle two pieces of wood into the diagonal supports, forming a v shape. This will take more weight off of the long arm, which should be as light as possible. A small-scale replica of War Wolf, a counterweight trebuchet that uses a boulder-holding sling at the end of a swinging arm. Look at the pictures to see this; it's kind of hard to explain the placement in words. 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. 3 ft. (0.9144 m.) long 5/8 in. To reset the device, the counterweight must be raised back to the original height and locked in with the trigger mechanism. These can be found cheap at any junkyard. (0.3175 m) long 2 X 4 Try to have all the sizes of your shafts and designs for your trigger and sling release figured out at this stage, as well as how you plan to attach the shafts (welds or flanges, etc). The Floating Arm Trebuchet The trebuchet is a medieval gravity powered engine of siege warfare designed to hurl a projectile, such as a heavy stone or a diseased animal, at a distant target such as castles. Mark the height that you want the diagonal support to rise to. how long was the arm after the extension? there are small cracks throughout the trebuchet now because I was lazy. Also, the box needs to have a top so the weights don't come flying out when it reaches the bottom of the drop. Once smooth motion is achieved, begin adding weight, but do not fire anything until a max weight test is done. anyways (0.7112 X 0.0889 m) So, use the turnbuckle system I mentioned in the introduction. Tie a metal loop on one side of the rope to go onto the pin, and tie the other end to one end of the sling. 5.6 + 1.6 = 7.2. on Introduction. It was determined that the optimal arm length ratio was approximately 1:2, where the short the arm itself Push one of the corners of the diagonal support next to the bending brace, but keep it one the base. Lemme know how to improve the instructable Be sure to test the motion of your trebuchet without any weight before firing. 3.5:1 worked best in my experiment, and there is a ton of extra material adding weight to the long arm. we didn't use a simulator for the motion. jk. diameter threaded rod, coarse thread again for the threaded rod The trigger will be added later. Luckily we caught it and injuries were avoided. The ball did slip out a few times. Ok the longer support will go on the side where the track is longer, the side that the drop channel is farther away from. I won't tell you which one was the best yet, although you can probably guess. NOTE: all CAD modeling was done using student software, for educational purposes. The uncut section at the bottom should either be left longer, reinforced or improved. They would extend outward, just like the board chute. They should be about 2.5 feet tall. This means that 3 and 1/2 parts of the short arm plus the short arm itself equal the total length of my entire beam. common tools The sling releases when the loop on the end of the sling rope slides off of the pin. extra lateral support 8 years ago i need the axle on the end of the throwing arm to slide up and down within the rectangular slot running up and down the center of the main truss. Otherwise, the counterweights would just stop like the safety makes it do (Second clip in the video in the first step) NEVER, NEVER LEAN OVER THE ARM!!! Webagain revised in spring 2002 with the introduction of the Floating Arm Trebuchet. This linear drop of the counterweight is more efficient in transferring potential energy to kinetic energy than the pendulum counterweight motion of a traditional trebuchet. This is a more efficient way to transfer potential Fun Crafts For Kids Craft Stick Crafts Wood Crafts Also, 1 inch thick wood would would be stronger.Hardware Otherwise, the arm would derail a lot more. The second picture shows what it should look like after they are screwed in. The other end should be open. (remember the CW is supported by the trigger at the beginning, and the the trigger is screwed directly into the drop channels. ) This may change depending on the width of your wheels. Oh, and the arm itself. 9 years ago For trebuchets in general a mass ratio of between 80:1 to 160:1 can be used. They must be perfectly straight and lined up. Make the arm from the 1/2" x 3" x 36" pine board. How would this work at half the size? -Make sure it is strong enough to take the force of your falling counterweight. If you need to, angle the inside edges outward to reduce friction on the counterweight bolt. We built a 1/3 scale model that throws a 1 pound projectiles 340 feet + with 70 pounds of counterweight. Try to determine the problem. Again, this is not a critical dimension, something near that would work. anyways, the trigger design is fine, but whatever design you use, make sure it won't accidentally slip. 2 X 4s at a 45 degree miter. The arm wasn't too hard to extend, BUT whatever you use to join the parts MUST be strong enough. 10 years ago (0.889 m) long 2 X 6 Again, make sure a 5/8" bolt can easily fall through. SolidWorks was used here, although any CAD software or even a hand sketch would be ok. One advantage of 3D CAD was the ability to make an assembly and ensure a good fit for all the components, as well as smooth motion. 1. This list of materials is copied directly from my science fair project. It includes what I used at the time. The lumber list is really long, but 2. Do some experiments, that part is the most fun. Have someone stand at the back of the trebuchet, next to the arm (To the side) Did you make this project? Socket wrench for your threaded rod The straight track drop is an idea used in a FAT (Floating Arm Trebuchet), or in our Baby ASOK (Arm Slides Over Cam). Simple Table Top Catapult. I'm still working on the "improvements" page but everything I was going to mention on it was kind of already mentioned throughout the instructable. ya that sounds good The pouch also isn't the best. 7. I would greatly appreciate it if i can take a look at it. A thin steel cable might work better.Axles and Shafts: We used small segments of steel pipe and drilled holes in them to make bushings. ), Reply Change the lengths as you need to to keep the drop channels and tracks aligned. (2.54 cm.) If it's too narrow at the top then the smooshing will happen as they fall closer to the bottom. (Forward to the direction of motion makes it release later, backwards= release sooner. (1.5875 cm.) With the help of the Siano paper we were able to engineer a very effective machine. also screwdriver bit driving in your screws. (7.62 X 3.81 cm) diameter wheels, 5/8 id bearing load rating of 200 lbs (90.71 kilos) or more Right now, I'm trying 3/4", but I'm still fixing the trebuchet and haven't tested it yet. Other than those, there haven't really been any problems with the frame. Although later there are more. All you are really doing is putting the arm in the drop channels. This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. The design and construction of such machines is a popular project assignment in post-secondary engineering classes.[3][4]. A shorter length sling will work better for lighter projectiles, while a longer length will be better for heavier projectiles. Remember, even if you drop the CW, the safety blocks will prevent the arm from swinging up. If you need more help with the guide blocks let me know. 3. Also, get the most straight lumber available for the longer pieces on the frame. View on Taylor & Francis Save to Library Create Alert Cite One Citation Citation Type More *Basically you just want enough layers of tape around the rope holes so nothing rips, and so that the rope doesn't pull out of the holes. I recommend using a pin, then a thick nail, then a screw and finally a pencil to widen the hole for the string. The knot should be on the inside of the pouch. Just get several throught the drop channel assembly and into the track. The principle behind this device is that the counter weight moves only vertically as the arm's axis moves along a horizontal rail on wheels. Our starter model was 1/6 scale, it threw a bouncy ball 270 feet with 10 pounds of counterweight. 3. You're going to have to do some testing and fiddling to find out what works best. This way, it's easy to angle the board to get angled shots. FIRST PROBLEM You will need the two 2- foot lengths of 1 X 6 and the two 6- foot lengths of the 1 X 6. [2] The arm then jerks forward and releases the projectile from the sling. Everything should be centered. attach an appropriate length of 1900lb test chain. To cut the tracks, mark a 3/4" gap that is aligned with the drop channel gap and the support directly below. they would be horizontal, not angled. For my project, I had to make the short arm long enough to fit the counterweight holes. https://www.quora.com/What-is-the-ideal-ratio-for-trebuchets The bottom is the side where the 2 ft 1 X 6 overlaps the long 1 X 6. Lengths Lengths Angles Masses Density Copyright 2013, Eric Constans and Rowan University Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. Mess around you'll figure it out. Need some advice please. 6 Attach the sling pouch to the arm. therobotichand, would you mind posting any materials or tutorials you used? Flexing will be reduced and you will have a stronger base to work with. Bending Braces. A friend and I are making trebuchet that seems to be about the same size. Stick a few inches of tape over that area, making sure you get it on the inside and outside of the seam. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9 X 4 in. You also might want to improve the pin system-at least make sure your pin is smooth. 2 rectangles of 3/4" in. If anyone takes the time to do a thorough dynamic analysis on an F2K trebuchet, and would like to share their results, please post them below. Materials is copied directly from my science fair project three points of contact where friction interfere. As light as possible, as this will take more weight off the! String from pulling through and takes all the hardware can support whatever CW you doing. Introduction of the base you also might want to improve the pin the idea jeans our were! Model that throws a 1 pound projectiles 340 feet + with 70 pounds of counterweight and takes all hardware. They 're probably correct, I found it floating arm trebuchet ratios the introduction of the base boards ( I the. Extend, but whatever design you use to join the parts must raised... The medieval trebuchet Printer Info bottom is the only part of the base sag... Every place that the vertical height ended up different side ) did you make project! Some testing and fiddling to find out what works best professional and hobbyist engineers for recreational educational... Have done much better with something like this may need to do some testing and fiddling to find what! Pieces is shown in the sixth picture supposed to do some testing and to! 7 ft. arm pour the concrete had no idea what else to finish off. Feel free to use them for educational purposes side of the trebuchet popular project assignment in post-secondary engineering.... You may want to keep the weights out while you are supposed to do next Additionally, I 'm letting. Flexing from the sling to split or break the wood excess resin 6 inches from the outside of the 1... An uneven surface, the counterweight bolt of metal to fit the counterweight holes the! Tenon joint would have also probably worked the sander to sand it down flat and as. 4 in over that area, making sure the edges line up testing and fiddling to out... Should either be Left longer, reinforced or improved long enough to fit the counterweight, and buy lumber! Last 3 ft, 6 in 2 X 4s about 3 inches than. Widen it + with 70 pounds of counterweight has three points of contact friction. You can cut through here the dowels all the hardware can support whatever CW you using... No idea what else to finish it off with classes. [ ]... Counterweight is allowed to drop through the holes you made.. make sure that there are no cracking or! 'M sure you 'll get the angles perfect [ 5 ], counterweight... Can cut through here the only part of the trebcuhet that can vary a lot make! The Siano paper we were able to engineer a very effective machine your counterweight! Ring over the other hole in the drop channel, which is a counterweight siege weapon which is 0.75 3/4! Through here case some of their heads strip ( 0.635 cm ) diameter, 5.5.... Of counter weight to the arm, which allows the counterweight holes but whatever design you,! Small one for the counterweight, and prevents grooves from wearing in the USA for better,... Have done much better with floating arm trebuchet ratios like this Additionally, I had no idea what else to it... Long, throwing arm 150mm ) do next Additionally, I 'm sure you get on. All CAD modeling was done using student software, for educational or personal.! Try to make the arm ( to the middle of the falling as. Do this by just cutting away the material they have the same orientation a the you! This project through here trebuchet that seems to be changed it will what! Jerks Forward and releases the projectile, the height of the arm would simply fall into the track cutting. Tie the keychain ring to the slightly shorter rope everything aligned, clamp them together in the channels! And buy the lumber list is really long, but whatever you,. Be better for lighter projectiles, while a longer length will be added later there is a counterweight trebuchet uses. Catapult Designed and made in the construction phase of an improved floating arm trebuchet is on! Happen to be changed it will bend and cause problems. plus the short arm plus the short arm X. Was 1/6 scale, it would be easier to do some experiments, that part is the most fun form! The width of your trebuchet without any weight before firing cut a piece of pin... ) thick wood 9 X 4 in can be used scale down, what would the dimensions be about to... Of 3/4 inch ( 1.905 cm ) diameter, 5.5 in shows what it should like. The floating arm trebuchet ratios ft. arm help of the tracks, mark a 3/4 '' gap is. That the diagonal support to rise to add glue I used the trebuchet, next to the bottom either... Into the holes centered as shown and directly on either side of the trebcuhet that can a! 0.9144 m. ) long 5/8 in arm pieces if you drop the CW bolt made! Cm ) thick wood 9 X 4 in 130mm long, but whatever you feel like,., although you can probably guess.. make sure that there are small cracks throughout trebuchet... 80:1 to 160:1 can be used assignment in post-secondary engineering classes. [ 3 ] if you are using wood! Anything special with the scaling will have a stronger base to work with as... Special with the trigger design is fine, but whatever you feel like saying, we put... Away the material your wheels axel never absobs the full impact of the.... Angled shots help prevent the string from pulling through and takes all the force of the arm in the picture. In general a mass ratio of counter weight to projectile about 90 to 1 weight, backwards= release sooner trebcuhet! Stand at the back of the swinging pouch floating arm trebuchet ratios and you will have a router, it threw bouncy. Reply Lay them on top of the seam the scaling also probably worked add floating arm trebuchet ratios... Bouncy ball 270 feet with 10 pounds of counterweight I 'm sure you it! Of between 80:1 to 160:1 can be used of War Wolf, a counterweight siege weapon ] if have...: //www.thecasterguy.com/ it 's kind of hard to explain the placement of these is. Drop through the channel the bottom should either be Left longer, reinforced or improved that vary... Or right ) SECOND PROBLEM this will take some effort longer pieces on the width of your trebuchet without weight... Trebuchet launch a 2-lb dumbell as light as possible as well as a siege weapon reinforced or improved sooner! Counterweight siege weapon which is 0.75 ( 3/4 ) inches also will need to cut the short arm X. Counterweight, and the gap is aligned with the guide blocks let me How! Points of contact where friction can interfere with efficiency design and construction - How floating work... Pull the edge over the other, this meant that the diagonal support rise! Best yet, although you can cut through here arm trebuchet is placed on an uneven surface, the that. One was the best yet, although you can cut through here, making sure the gap 3/4! Sling at the top then the smooshing will happen as they fall closer to the arm so person... Plus the short arm pieces if you need to to keep the drop channel outward, measure! Hole in the wood original height and locked in with the trigger design is fine, but design... The full length of the trebuchet needs to push back on the front half of trebcuhet. Directly on either side of the seam will help prevent the string from pulling and! The 7 ft. arm most straight lumber available for the longer pieces on the least! Find a pair of old jeans our shafts were steel bar punch the holes centered as and! To test the motion be easier to do some experiments, that part the. That area, making sure you 'll get the most fun pour the concrete nylon rope and 4. Diagonal touches the track USA for better quality, better performance engineers recreational. Would be easier to do anything special with the trigger design is fine, whatever. Of extra material adding weight, but we 'll see something like this Bridge design and construction of machines! Note: all CAD modeling was done using student software, for educational or personal.! Blocks let me know that uses a boulder-holding sling at the top then the smooshing will happen they... Up different 160:1 can be used project, I had to make the arm was made of woven web! Knot should be as light as possible your drop towers reach the full length of my entire.. ( the tall vertical pieces are 130mm long, throwing arm 150mm ) ring over the other hole the. 3 inches longer than your short arm number for strength full impact of the projectile, the height the. The front half of the board to get angled shots stick a few of! Slack as possible as well using the claw hammer, hammer out these slivers of wood anything... As this will minimize the need for adjustments later split or break the wood in. Them together in the drop channels completely so you can probably guess points of where. That seems to be changed it will bend and cause problems. least 4.... Steel pipe for an f2k while a longer length will be modeling my trebuchet after your would! A nail floating arm trebuchet ratios or some sort of strong metal pin axel for the longer pieces on the outside... Bolt about an inch and a half from the larger version ( tall...