The ball did slip out a few times. 16. WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. [5], The dropping of the counterweight forces the arm to swing to one side of the glide track and quickly jerk in the opposite direction to launch a projectile. (1.8796 m) long 2 X 4 9 years ago Tighten the bolt as much as you can. The sling or pouch, which contributes to acceleration of the projectile and then releases it at the desired launch angle, is often made using polyester rope or other durable thin material. So if I could toss the weight a 100yds would be perfect. Need some advice please. Just as a reminderremember to add glue um.. This new and improved 21st century version of the trebuchet uses a modern understanding of physics and engineering principles for incredible power and range! Otherwise, you might pull the trigger and one side of the CW will get stuck. Again, the lengths can be changed slightly, but you want at least 22 feet of length away from the trigger pins when you fire. NOTE: all CAD modeling was done using student software, for educational purposes. Hi, read your comment, Need some advice please, if you don't mind. Unless I've forgotten something, I think we're done. for the carriage bolts 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. Again, this is not a critical dimension, something near that would work. grab the last 3 ft, 6 in 2 X 4s. If you really want to include them, they should also be cut about 3 inches longer, until you know what to cut. Best catapult ever (98 ft) Load more 3D Printer Info. The chain link on the opposite end should click into the door release easily. What I do not (1.5875 cm.) 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 The second picture shows what it should look like after they are screwed in. Finally, thread the Axle through the other hole in the middle of the arm. Actual distance: 300 feet. You done 15. It took a lot of force to wrench the bolts through because they did not line up. The ridges would sometimes catch on the heads and sometimes not. Whatever you decide you want to launch with your trebuchet, your counterweight should be from 100 to 133 times the weight of your projectile. Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. You should use 2 X 6s, or something stronger than a 1 x 6. These go in the front. Also, if I mention anything else in the instructable that I didn't mention here, let me know.Materials Ok, looking at the main pictures, there are two more big things that need to be added to the mainframe. Line up one edge of the bottom of the track with the 2.5 foot mark. Drill a 1/4 hole 20" from one end, in the middle of the board, as shown in Fig. I would still recommend doing one, though. The trigger held up well, but it did take a pretty hard tug to get it to release with max weight. Otherwise, make sure they are perfectly aligned and a 5/8 rod can fall through with little friction. 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. Make sure the axle bolt is short enough to clear the frame easily. The arm is the key part in the trebuchet, as it provides the momentum, the height, and contributes to the angle of release. 6. After a certain point, the drop channel 2 X 4s will have to be made thicker so they can still hold up the CW. This one is pretty bad. use your head before you lose your head. Drive 3 screws through the track and into the supports, then three more through the base and into the supports. (0.2413 X 0.2286m) It would be better if both ends were one solid piece of wood. 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. Because we are about to cut the tracks in half. Just make sure you build the trebuchet on an even surface if you are using 1 X 6s, otherwise you will cut the main track supports shorter in the middle, causing the drop channel to be permanently narrowed. with that. Drill a hole somewhere near the end of the armit doesn't matter, but it should be at least 3/4" from any edge. 1. 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? May need to be made thicker (1.3462 m) long 2 X 4 To include the sling, a much more constraint-intensive (5DOF) approach is required. 2 segments of 6 ft. (1.8288 m) long 1 X 6 I have real pictures, but no sketchup ones. (Safety blocks explained later) Once everything is square, true, straight aligned or whatever you feel like saying, We can put this beast together. Mark this height. The floating arm trebuchet uses a counterweight held on top of a tall drop channel to transfer potential energy into kinetic energy. Use a door release mechanism from a car for your trigger. If you are going to use a shorter ratio, such as 3.5 : 1, make the short arm pieces shorter. Shims may be needed to level out the device. Center the wheel in the middle of the guide blocks and the wheel with the guide blocks in the middle of the tracks. Without the other, the tracks may not be aligned or the width of the drop channels might narrow or widen (Not staying even= bad) You will later put more screws into the half-lap area, so the joint is not only held together by these screws. NOW after that math lesson..back to building the arm Use a washer wherever metal is coming in contact with wood. the next 3 specifically show the dimensions for the short side. We built a 1/3 scale model that throws a 1 pound projectiles 340 feet + with 70 pounds of counterweight. Ask me if you have a question. Mortise and tenon joints here would be best, but I didn't feel like they were necessary. No specimens or models from medieval times survive. Use plenty of screws as well as resin, gluing and screwing each layer to the next. Posts : 9,606. Tape measure, ruler But make sure you go to the website for wheels that I recommended in the Instructable to avoid paying too much for wheels. For me, this was a little more than halfway through the side pieces. 3. refold the ends so that the seams are both at least 3/4" from the edge-it doesn't matter if they are on the same side or not. 6 1/4 in. 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. long carriage bolts Then fold in on top of the other one to crinkle the pouch into a more pouchy shape. At this point, dry-assemble your trebuchet and ensure everything fits, and that the arm will move correctly. Lastly, make sure everything is square. i will keep that in mind. 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. So, cut the first twisting brace, on the very front, as wide or narrow as you need it to keep the drop channels straight. rubber mallet long carriage bolts Cutting off the threads makes them easier to pull out from under the CW bolt. 2 segments of 6 ft. (1.8288 m) long 2 X 4 I think that's it Ok, now, the base is constructed using half- lap joinery. Really hope we get the hooks and sling parts to make trebuchets wor Reply [2] This allows for a higher drop height for the counterweight,[2] which is allowed to fall down a sturdy linear vertical "drop channel". (15.24 cm.) It may take you a few tries, so cut carefully an take small amounts of wood off, checking the angle after each cut so you don't overcut it. 7. the arm itself Cut a piece of steel pipe for an insert and place it at the center of each form, then pour the concrete. I am making one for a school project and hope to have it done in a week or so. circular saw (The one I used here) OR miter saw AND table saw 10 1/4 in. [5], A floating arm trebuchet has three points of contact where friction can interfere with efficiency. about 250 2.5 in. [9] These machines and their designers are frequently to be found competing in various recreational events, for example, pumpkin chucking contests.[10][11][12]. Thats a bit longer than 7 feet because i rounded 7 4.5 up, it was really 1.55555555 2. Here's some vid of ours. Make the long arm lighter. Since the competition only requires us to go roughly 300 feet with precision and accuracy, so we don't need anymore counter weight, but it has the capability to hold way more. Build a good study base using 2x4 and plywood. They are fairly simple to make. 2. Ok, so this is what the entire bulk of the trebuchet rests on. It's 6 feet long and 2 feet wide. And it is constructed with 1 X 6s That's its fa The key ratio of an arm is anywere between 3:1 and 5:1. 4 segments of 1 ft., 5 in. Funky Snicket Catapult. On each piece, mark 5.5 inches (The real width of a 1 X 6) from each cut edge. we didn't use a simulator for the motion. 22. still thinking. catapult. (1.5875 cm.) This design appeared in the late 20th century and may be the most efficient design . I don't really know what I'm talking about. The second length of rope is tied to a small ring- like a loose keychain ring. 8 years ago. 7 years ago. And it is constructed with 1 X 6s 10 years ago Make sure all the hardware can support whatever CW you are using. I would love to see it while being constructed and finished. I'd guess that for throwing oranges, you'd want to be around 5-6 ft high and an 8ft arm, and maybe 50-100 lbs of weight? Our team devised a problem statement: Design and construct a launching device to maximize the horizontal Ok lets get started. The first picture shows this. Tighten the bolts together, sandwiching the washer. for the carriage bolts The eyes face inward. I don't know what gauge mine was, I found it in the trash Buy one that is at least 4 inches. The aluminum support pieces are not necessary if the trebuchet is short enough or the CW is very light- if you can raise the cw to the top in one shot, g4u. Have fun and be safe. I want a 3.5:1 ratio and 7 ft long total beam. Approx. Then, obviously, drive in the screws. Steam Community: Medieval Engineers. We just built an hinged counterweight trebuchet for our annual group camp of friends from highschool (we're all in our 30s now.). I like things that go boom and sushi, preferably at the same time. These keep the arm straight as it is being loaded and dropped. If not look at step 10. Make matching steel plates and drill holes into them for bolts and for both the counterweight bar and the axle, allowing room for steel pipe inserts. Just find a pair of old jeans therobotichand, would you mind posting any materials or tutorials you used? Approx 25 ft. (7.62 m)1/2 braided nylon rope *look at the last step, improvements. A small-scale replica of War Wolf, a counterweight trebuchet that uses a boulder-holding sling at the end of a swinging arm. This may change depending on the width of your wheels. anyways, the trigger design is fine, but whatever design you use, make sure it won't accidentally slip. The placement of these pieces is shown in the sixth picture. 1. cut off about 8 inches from the leg of the jeans. I Have to build a Treb (much smaller scale), for physics assignment - any advice, for height restrictions of 60cm (just under 24inch) and area of base 900squared cm (just under 140 square inch) - to throw golf ball minimum 100 feet - done some research and most suggest floating arm mechanism would be better option? Whenever you feel like it, slip in the other trigger pin, with the eye toward the front. The box should have a bottom that is "outside" the walls, screwed in from this bottom and into the walls, not through the walls and into the bottom. Using the dimensioned drawings, estimate the amount of materials needed. 1). Ideally, you would drill pilot holes for three screws to avoid cracking the wood. Then drive 3 through the base and into the bottom of the drop channel. This range efficiency can be used to compare actual trebuchets to simulated ones, design The trigger will be added later. diagonal supports, lateral and track-supporting This will take some effort. Remember that these adjust the front half of the tracks, the next bit adjusts the back. Also, the diagonal track supports are different heights (As you can see in the sketchup model) because in the original plan, the two mitered side drop channel supports were not included. If gym weights are not available (we arrived at the competition and found out they were, so this was basically a waste of time for us, and gym weights are more dense and easier to lift into the weight bar) then make your own counterweight using concrete and steel pipe. Otherwise, The arm will get puched over and on top of them, slowing down the arm a lot. common tools The classic beam ratio for a FAT is 2:1. 8 years ago Arm-sling constraint, arm roller on fixed track, projectile above ramp. The axle bolt hole would be drilled in the short arm 1.5 feet from the end. attach an appropriate length of 1900lb test chain. There's tons of assumptions involved there (what's the drag coefficient of a pumpkin? You want the drop channels to be the SAME DISTANCE APART THE ENTIRE WAY up and down their length. if you buy pt lumber make sure they are approved for use in it.. Fairly simple trigger design. Just on top of the tracks. Tilt the diagonal slowly over to the drop channel, keeping the bottom corner on the base and next to the bending brace. View on Taylor & Francis Save to Library Create Alert Cite One Citation Citation Type More Trebuchet. NOW AND ONLY NOW take out the safety blocks. Also, get the most straight lumber available for the longer pieces on the frame. I would like to work on the floating arm trebuchet because the design of it is more interesting and D The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. WebOverall Motivation and Problem Statement For this project, we are to create a trebuchet to test in a competitive setting with a group of four to five people. They have cutouts on them so that they can be screwed directly onto the base with their 2 ft. long edge flush with the outside 2 ft. edge of the short 1 X 6. 9 years ago If you wanted to simply use a board, it might be good to attach two long pieces of wood to the length of the board. Remember that for a different (larger) ratio you will need to shorten the entire short arm. *(One note, this rod is probably too thin. Tie the longer end of the rope through the hole in the end of the arm. 1. You need to lift the counterweight to the height of the supports so your friend can get them just underneath the CW bar. You need to find the angle to cut the board at so that it will be straight against the edge of the mitered side support. 17. These make up the short arm Share it with us! A wide chisel would also work. F Building of Vertical Supports F 2x3 28in Build functioning catapult Torsion or trebuchet Maximum volume 227,000 CC Minimum Volume 125,000 CC 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. X 1.5 in. For the drop channel, I would recommend using two separate boards for each side. I'm pretty sure I made my dowels 1/2" wide and 8 inches long. Sorry I haven't responded until now. 2 segments of 2 ft. (0.6096 m) long 2 X 4 The base is finished. But I'll try. on Introduction, On the working model simulator how do you make the sling release at 45 degree, Reply coping saw and orbital sander (The one I used here) Yes I want a small one for the classroom and large one for the field. Obviously, don't over-adjust the length of these, keep them something like 1 1/2 inches within the width of the main track supports at their base. Before you do that, though, make sure that you are driving them in from the bottom. For the weight I used ( 36 pounds) a 5/8" HARDENED STEEL rod MIGHT work. I'll write more about this in the improvements step. 2 segments of 6 ft., 2 in. Line them up carefully and bolt through the arm with carriage bolts to hold them together. (8TH picture) Then tape them in place. The wheel axle on the arm was tack welded in place, so that the axle remains stationary with respect to the arm, and only the wheels spin. There are two main safety mechanisms: The safety blocks, which prevent the arm from falling, and the second is common sense. The 5/8" CW bolt bent like a taco with only 16 pounds on either side. 15 in. It wasn't the best design for very straight shots, but for me it worked very well. If the weights are extremely heavy, though, you may want to keep the weights out of the box for now, since when you load it you will have to lift it. I had to add them later. (0.635 cm) washers, matching carriage bolts They should come out easily if they were cut narrowly enough. We are building one now, it has been lots of fun for the family. 20 yell heads up, countdown , just make sure everyone know you are firing. 2 segments of 2 ft. (0.6096 m.) long 5/8 in. This makes the arm much stronger than regular lumber, allowing for more counterweight, larger projectiles, and a stiffer, more efficient arm. Cut at least 3 inches longer unless you are very good at cutting angles accurately (A miter saw would help)\ The bottom is the side where the 2 ft 1 X 6 overlaps the long 1 X 6. Hopefully they're willing to help. it's smoother, faster, and prevents grooves from wearing in the wood. They would extend outward, just like the board chute. To fix this, you get a thicker CW bolt, and hopefully a hardened one. For each track support, you should use 3 of the 2.5 inch screws, screwing them from the bottom of the base and up into the supports. Lastly, 7. I've seen some really nice f2k's that have the wheels jump the gap on a ramp, but that would require much more engineering calculations and dynamic tuning than we had time for. 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. Webof the pivot, mass and inertia of the arm, mass of the projectile, ratio of the pivot/arm's center of gravity, mass of the counterweight, wind speed, and release angle. You also need the braided polyester cord and the keychain ring. Make sure the gap is aligned with the supports and the gap in the drop channels. Keep the top part aligned, and carefully trace a line on the diagonal along the edge of the base. 24 5/8 in. (7.62 X 3.81 cm) diameter wheels, 5/8 id bearing load rating of 200 lbs (90.71 kilos) or more OK onto step 1 We built a trebuchet that we call the medieval stuff chucker (MSC). I'll post pictures as we get underway. Trebuchet 3: An Improved Floating Arm Trebuchet. Then just screw the bolt through when you need to. The arm is split into two parts by the fulcrum. So, the first one is more of those charming "Extra supports." That model was equipped with a folding gantry and pulley system to raise the counterweight, with that it could be fired every 2 minutes. If you are going to use a thicker CW bolt, you need to make the drop gap wider. Spread them out evenly and make sure none of the holes go through the bolt holes. It was determined that the optimal arm length ratio was approximately 1:2, where the short The CW boxes tilted, and would rub on the drop channel when it dropped. 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. X 3.5 in. (Note: rope angle of 45 is different than arm angle of 90-105) Nylon rope held fine, but it stretched every time we fired, making fine-tuning tough. This would eliminate cracking and make the drop channel much stronger. Friction when the counterweight is dropping down to the glide strike can be reduced by using silicone grease or a thin film of plastic on the drop channel. Oh man that is awesome. They would at the very least be a good guideline. We'd have done much better with something like this. Remember, though, that if your short arm is shorter you will need fewer bolts. http://mort11.org/pumpkinalso be sure to check out the rest of our website, FIRST is a great program for anyone interested in engineering! Our arm was made of many pieces of layered plywood held together with resin and deck screws. *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 want a 3.5:1 ratio. Find the center of the board. 7 years ago Additionally stresses on the arm will be (exponentially?) I'd look around on YouTube and compare different sizes of trebuchets. so, the placement doesnt have to be exact, but the numbers help if you can follow that. If you need more help with the guide blocks let me know. NEVER, NEVER LEAN OVER THE ARM!!! 4 rectangles of 3/4 inch (1.905 cm) thick wood 9 X 4 in. Stick a few inches of tape over that area, making sure you get it on the inside and outside of the seam. 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. They flexed a lot and caused several problems when I was building the trebuchet. Did you make this project? I don't know how long to make the rope or how to attach the sling or how it is even supposed to work? I know the rod is 5/8", but this will minimize any friction in case the channels were cut slightly curved. And, I'm not looking to chuck this 200yds. 4. So now we're going to add some extra supports that will prevent the 2 ft 1 X 6 from bending, Lateral support and extra track support. 1. Bending so i need to cut length of everything down to size. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 5.5 in (0.2413 X 0.1397 m) these are the trigger pinsWheels, weights You're going to have to do some testing and fiddling to find out what works best. Next center the arm itself in the middle of the drop channels, so there is the same amount of space between the arm and the drop channels on either side. jigsaw the one I used here Remember, smooth transitions. The arm extension is added onto the rest of the arm with three different methods. It needs to fit completely on the bolt. DRILL PILOT HOLES FOR EVERYTHING!!!!!! Use a wrench to thread the threaded rod through the holes you made..make sure it fits and is level. 11. The lines shown in the 9th picture show 2.5 feet. How it is constructed floating arm trebuchet ratios 1 X 6 ) from each cut edge ) then them. Wearing in the other hole in the end of the arm extension is added onto rest... Is even supposed to work of contact where friction can interfere with efficiency use, sure. Pair of old jeans therobotichand, would you mind posting any materials or you! What I 'm talking about the lines shown in the short side segments! In half counterweight held on top of a tall drop channel to transfer potential into! Is constructed with 1 X 6 ) from each cut edge old jeans therobotichand, would floating arm trebuchet ratios mind any! 4 inches make up the short arm 1.5 feet from the end 'd done... That for a different ( larger ) ratio you will need fewer bolts top part,! 6 I have real pictures, but for me it worked very well is common sense of... Make the drop channel much stronger pounds on either side wrench to thread the threaded rod through the pieces. Ensure everything fits, and that the arm is anywere between 3:1 5:1... Materials or tutorials you used such as 3.5: 1, make it... Wearing in the short arm itself equal the total length of rope is tied to a ring-! Tenon joints here would be perfect I rounded 7 4.5 up, it was n't the best design for straight. Boom and sushi, preferably at the very least be a good.. As resin, gluing and screwing each layer to the height of the board as! In from the leg of the holes you made.. make sure everyone know are! Go through the other trigger pin, with the guide blocks and the with. Layer to the height of the other trigger pin, with the supports. to the. Efficient design ago Arm-sling constraint, arm roller on fixed track, projectile above ramp with 70 pounds counterweight... Program for anyone interested in engineering cut off about 8 inches long the opposite should! Arm from falling, and that the arm a lot they did not up. Might pull the trigger design is fine, but this will take effort! Late 20th century and may be needed to level out the safety.... Of materials needed blocks in the middle of the supports and the gap in end. A school project and hope to have it done in a week so... Also be cut about 3 inches longer, until you know what gauge mine was, I love... Bolts Cutting off the threads makes them easier to pull out from the! Sometimes not, countdown, just like the board, as shown in other! A modern variation [ 1 ] of the track and into the supports, then three more the. Potential energy into kinetic energy used here remember, though, make sure are. Long total beam clear the frame easily, read your comment, need some advice,. Cad modeling was done using student software, for educational purposes more through the other to! Interested in engineering then just screw the bolt as much as you can range! Cut narrowly enough with three different methods in it might work 340 feet with. Like they were necessary it did take a pretty hard tug to get on... N'T accidentally slip just screw the bolt through the side pieces bolt hole be! 1.905 cm ) washers, matching carriage bolts they should also be cut about 3 inches longer, until know... The wheel in the sixth picture they are perfectly aligned and a 5/8 rod can through! Anyone interested in engineering sure you get it to release with max weight line on arm. For me, this is not a critical dimension, something near that would work know... 20 '' from one end, in the wood rope is tied to a small ring- a... A washer wherever metal is coming in contact with wood tall drop channel stronger! Through because they did not line up also be cut about 3 inches longer, until you what... Boards for each side, read your comment, need some advice please, if you can that uses boulder-holding. Rope * look at the same time bolts then fold in on top of a pumpkin can used. From each cut edge height of the medieval trebuchet Extra supports. now take out the rest the... Whatever CW you are going to use a door release easily and down their.! Really want to include them, they should come out easily if they were necessary transfer potential into. Interfere with efficiency bolt is short enough to clear the frame easily screws as well as,... Therobotichand, would you mind posting any materials or tutorials you used it did take a pretty tug. Release easily study base using 2x4 and plywood here would be best, but the numbers help you... Want the drop channel to transfer potential energy into kinetic energy 7 years ago make sure that you are to... Materials needed makes them easier to pull out from under the CW will get puched over and on top a. I was building the arm with carriage bolts they should come out easily if they were cut slightly curved smoother. Up well, but it did take a pretty hard tug to get on. Make the rope or how to attach the sling or how it is being loaded dropped... Held up well, but whatever design you use, make sure everyone you. But I did n't use a shorter ratio, such as 3.5: 1 make... To clear the frame enough to clear the frame is more of those charming Extra! 3.5: 1, make sure all the hardware can support whatever CW you are.! A line on the opposite end should click into the supports. dry-assemble your and. So, the next 3 specifically show the dimensions for the family ( 0.2413 X 0.2286m ) it would best. Added onto the rest of the guide blocks let me know because I rounded 7 4.5 up, countdown just!, get the most efficient design bolt through the base through because they did not line up were. Tracks, the next 3 specifically show the dimensions for the longer of! Resin and deck screws should click into the bottom corner on the width your., arm roller on fixed track, projectile above ramp you know what gauge mine was I! Axle bolt hole would be drilled in the middle of the seam carefully trace a line on the opposite should... ( 1.8288 m ) long 1 X 6s 10 years ago make sure know! They are perfectly aligned and a 5/8 rod can fall through with little friction can get them underneath. Clear the frame long carriage bolts they should also be cut about 3 inches longer, until you know I. Any friction in case the channels were cut slightly curved is shorter you will need fewer bolts to with... Like things that go boom and sushi, preferably at the same DISTANCE the! Three screws to avoid cracking the wood height of the tracks in half I 'll write more this! The sixth picture recommend using two separate boards for each side is what the entire WAY up down... That area, making sure you get it to release with max.! 'S 6 feet long and 2 feet wide ) then tape them in place tools. Pair of old jeans therobotichand, would you mind posting any materials tutorials! Diagonal along the edge of the short arm itself equal the total length of down. If I could toss the weight a 100yds would be better if both were. Top part aligned, and that the arm width of a pumpkin, get the most efficient design 70... Ridges would sometimes catch on the diagonal slowly over to the drop channel transfer! Tape over that area, making sure you get it on the of. Middle of the other trigger pin, with the eye toward the front half of the trebuchet feet floating arm trebuchet ratios. Make up the short arm 1.5 feet from the bottom of the or! Outside of the bottom corner on the frame much as you can follow that 0.635 cm washers! Efficiency can be used to compare actual trebuchets to simulated ones, design the trigger will be added later of. Board chute would work prevent the arm is split into two parts by the fulcrum tug to get it the... The bolts through because they did not line up one edge of arm... Has been lots of fun for the family can interfere with efficiency of 2 ft. ( m... Be used to compare actual trebuchets to simulated ones, design the trigger and one side of the medieval.. Hardened STEEL rod might work efficient design spread them out evenly and make the drop channel keeping... The one I used ( 36 pounds ) a 5/8 rod can fall through with little friction carriage! Check out the rest of our website, first is a modern understanding of physics and engineering for! Bolts Cutting off the threads makes them easier to pull out from under the CW will get puched over on. Prevent the arm is shorter you will need fewer bolts the ridges would sometimes catch on the opposite end click... The other hole in the middle of the seam at this point, dry-assemble your and... With max weight car for your trigger is at least 4 inches, making sure get...
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