Make sure the axle bolt is short enough to clear the frame easily. (0.2413 X 0.2286m) Arm-sling constraint, arm on fixed roller, projectile on ramp. Ensure that the tension will be applied in a direction that is similar to the way it is intended to be used in a car door. If you are going to use a thicker CW bolt, you need to make the drop gap wider. Add the two numbers of your ratio together. If you make the channel a lot wider, I would suggest using a wider piece of wood or strength. Oh, and the arm itself. For me, this was a little more than halfway through the side pieces. LEAVE A COMMENT AND RATE! This film is made to demonstrate some easy steps to go through when making a FAT (Floating arm trebuchet). These are the horizontal beams that are used as the track. 2 segments of 2 ft. (0.6096 m) long 2 X 4 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. The person standing on the trebcuhet is no longer in danger unless he drops the bolt on his foot. 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. So, the first one is more of those charming "Extra supports." If you want a better pin system, look at the turnbuckle pin system here. Make a square line across the flat side of the board. diameter threaded rod, coarse thread 9 years ago Really cool project Brother, thanks for putting together a great instructable. No specimens or models from medieval times survive. All you are really doing is putting the arm in the drop channels. This will take some effort. 3. Avoid contact with the arm as much as possible, they are only there to guide. This design appeared in the late 20th century and may be the most efficient design . I'm pretty sure I made my dowels 1/2" wide and 8 inches long. 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. *look at the last step: improvements. 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. Line up one edge of the bottom of the track with the 2.5 foot mark. Webfloating arm trebuchet ratios. The second picture shows what it should look like after they are screwed in. Hopefully everything has been built straight and solid. Simple Table Top Catapult. This metal loop goes around the pin, and as the centrifugal force increases as the arm swings, the ring slides off the pin to allow the pouch to open. 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. (KE = .5*GPE, so .5mv^2=.5mgh) Solve for the velocity. Onto one end of the rod screw on a bolt, washer, and another bolt in that order. I would like to work on the floating arm trebuchet because the design of it is more interesting and D I would get more in case some of their heads strip WebLaser Cut Desktop Trebuchet. these are the trigger pinsWheels, weights The radios of rail height/overall drop, arm length, counterweight/projectile weight, wheel size, etc were all guessed based off existing trebuchets from internet sources. When the trebuchet is placed on an uneven surface, the base will sag into whatever dip or bend upwards because of whatever hill. 50 ft. (15.34 m) of 3/16 (0.47625 cm) braided polyester cord Once they are pulled, they do not interfere with the motion of the arm. Don't judge me) Beside the arm when it's at rest, these two channels are the tallest point of the trebuchet. Otherwise, The arm will get puched over and on top of them, slowing down the arm a lot. May need to be made thicker Otherwise, make sure they are perfectly aligned and a 5/8 rod can fall through with little friction. The When you look at the picture, they are the big, tall, straight pieces. Clamp the beam and let it dry, allowing the appropriate time for curing (follow resin instructions). excellent site for cheap, strong wheels http://www.thecasterguy.com/ There are plenty of places you can go on the internet to look for better ideas. With the help of the Siano paper we were able to engineer a very effective machine. For the weight I used ( 36 pounds) a 5/8" HARDENED STEEL rod MIGHT work. Pretty nice, but you could get a lot more power by lowering your tracks by about a foot. We built a trebuchet that we call the medieval stuff chucker (MSC). DRILL PILOT HOLES FOR EVERYTHING!!!!!! Then just screw the bolt through when you need to. 17. Lower it below the base, just rest it on the floor. Lastly, drill a hole through both the walls of each box at least two inches from the top edge for the counterweight bolt. I just so happen to be in the construction phase of an improved floating arm trebuchet. Again, not critical. 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. Large scale designs require special trigger mechanisms that can hold the weight of the throwing arm. Consider cost and use whatever spare or donated materials you can find. (Diagonally). This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. 91.4 meters. Again, make sure the 5/8" bolt can easily fall from the very top of the drop channels all the way to the bottom of the drop channels. First of all you need two people 5. 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. thick plywood, 2 ft., 5 in. Whenever you feel like it, slip in the other trigger pin, with the eye toward the front. (third picture on the right) RLT industries trebuchet.com less than on a longer, heavier arm, so you have more of an opportunity to make it extremely light, if that makes any sense. Licensed under CC BY 3.0, via Wikimedia (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. it's smoother, faster, and prevents grooves from wearing in the wood. The Arm. 22. still thinking. 8 .5 in. Remember the length really is only 1 ft 5 in. Just as a reminderremember to add glue Build the frame in two identical halves (left and right) and then attach each half to the frame. Although the trebuchet will work so small, it might be better to increase the arm ration. We actually did not have motion software, we just looked at lots of YouTube videos. The trebuchet, as is, would probably not be able to launch such a heavy projectile, but I'm not sure. This is a more efficient way to transfer potential energy into kinetic energy at a small scale. Floating arm trebuchet (dimes and pennies) Desktop Trebuchet. on Introduction. Make sure all the hardware can support whatever CW you are using. At this point, dry-assemble your trebuchet and ensure everything fits, and that the arm will move correctly. While the floating arm design can have a lighter frame than a traditional trebuchet because the overall forces produces are less,[7] the impact of the arm on the glide track will cause eventual damage and may need maintenance. Your arm should look nice and smooth like the pics. I had no idea what the problem was at first. You can pretty much change the positions of these pieces as much as you want, but the positions they are in now worked great for me. This kit is professionally engineered, designed and manufactured in the USA. Place the weights in the box and screw on the top. Maybe the wood "stretched" and then was kept in place as the glue dried. Lastly, cut through the plywood rectangle so the wheel does not bump over the edge of the plywood as the arm falls. Line the short edge up with the 8 ft piece of the drop channel. It launches 5 pound pumpkins around 320 feet with 250 pounds of counter weight. 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. thank you very much. when the counterweight is raised, the trigger pins are slipped through one eye bolt, under the counterweight bolt, and through the other eye bolt. I recommend using a pin, then a thick nail, then a screw and finally a pencil to widen the hole for the string. In contrast, a floating arm trebuchet features an axle on the arm freely moving along a horizontal glide track. Make sure everyone knows you are firing. If it's too narrow at the top then the smooshing will happen as they fall closer to the bottom. Then drive 2 screws through the board with the actual channel on either side of the gap, diagonal from each other so that you can fit two into the narrow width of the wood on either side of the gap. I've definitely seen some trebuchets in that size range throwing tennis balls, 6" steel shot, etc very far. Shims may be needed to level out the device. (1.5875 cm.) You need to lift the counterweight to the height of the supports so your friend can get them just underneath the CW bar. Finally, tie the keychain ring to the slightly shorter rope. I keep them in one of the mitered side support screw holes so I can easily reach them once I get the CW to the top. I've always wanted one did you ever build a smaller one to start with? The chain was then loosened again, the weights removed, and the arm cocked and locked with the safety bars again, and the cycle repeats.We chose to paint our trebuchet and stencil our school logo onto it, but this is just for looks.IMPORTANT: Safety is crucial when firing trebuchets. and if everyone wants the step I'll add it. I came across a problem for the quick release. They're probably correct, I'm just letting you know. Use a drill press if you are going to drill one hole because one hole needs to be better aligned than a bunch of smaller ones. these will be used in the trigger Heavier projectile= earlier, lighter projectile = later. ) Oh man that is awesome. If you need any more help feel free to let me know, and it would be great to see a picture of the final thing. 2. Their defining feature is free movement of an axle on the 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 6 1/4 in. Stick a few inches of tape over that area, making sure you get it on the inside and outside of the seam. Record the next shot if the first one does not go well. Position them in between the two main track supports and trace a line as best as you can along where they overlap; this is where you will cut the half-lap. Now comes the moment of truth. If not look at step 10. I attached the arm extension to the rest of the arm with some wood pices, dowels and some leftover aluminum channeling. It's the same process of cutting slits, hammering out the wood and sanding it smooth. 7 years ago [7] A projectile is loaded into a sling at the end of the throwing arm. Have someone stand at the back of the trebuchet, next to the arm (To the side) so, the placement doesnt have to be exact, but the numbers help if you can follow that. After looking at the dozens of picture I took, It should be pretty easy to figure out how to put everything together. Webtwice the ratio of the CW to projectile masses times the distance that the CW falls. You will need the two 2- foot lengths of 1 X 6 and the two 6- foot lengths of the 1 X 6. therobotichand, would you mind posting any materials or tutorials you used? [2] The projectile can be launched at a high velocity.[6]. I will be modeling my trebuchet after your and would like to know Can the trebuchet launch a 2-lb dumbell? It should be easy enough to follow. 8 matching cut washers I'll write more about this in the improvements step. Main track supports You will later put more screws into the half-lap area, so the joint is not only held together by these screws. So, This project is not due until sometime in may, but I will be glad to post pictures. Use the top bolt for screwing in, and the bottom one for unscrewing. (Should be square to the length of the board, like a crosscut.) To include the I don't really know what I'm talking about. 5. X 3.5 in. 3/8 X 4 eye bolt (Including bolts) First, I'm going to talk about some other improvements that are more important than the arm. ya that sounds good Thats a bit longer than 7 feet because i rounded 7 4.5 up, it was really 1.55555555 Ok, find a flat surface and 3 scrap pieces of 2 X 4. X 3.5 in. 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. 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. Remember that for a different (larger) ratio you will need to shorten the entire short arm. I like things that go boom and sushi, preferably at the same time. This was a bit too heavy as we had to load each weight manually to fire our trebuchet. Different jeans vary, so this next step might be different for you. Awesome trebuchet! A pair of wheels allows the arm to roll along This is what fit for me. I think that's it Just find a pair of old jeans Lean the supports in towards the drop channel as they go up so they don't slip out. Trebuchet. So we built a 10 throwing arm trebuchet. If you need to beef things up, like the counterweight bolt and wheels, it might cost more. First, the two pieces are drilled and doweled. This is only to coutersink the screws, do not drill the hole all the way through. (Hopefully your friends haven't deserted you over this trebuchet obsession. Our team devised a problem statement: Design and construct a launching device to maximize the horizontal For the arm assembly I want a 3.5:1 ratio and 7 ft long total beam. Here, we followed the dimensions on the drawing and cut very precisely. Then cut the short arm 2 X 4s about 3 inches longer than your short arm number for strength. drill (The one I used here came in a kit here) with a varied drill bit set, for pilot holes, etc. The lines shown in the 9th picture show 2.5 feet. If I need to bring the scale down, what would the dimensions be? The first 5 pictures (except the first and second) specifically show the dimensions for the "long" side. will this still work that small? Then just screw them in. Circuits | Floating Arm Trebuchet : 7 Steps (with Pictures) - Instructables This range efficiency can be used to compare actual trebuchets to simulated ones, design This would, however, change the lengths of the diagonal supports. Try to figure out where to put the 3/8" eye bolts so that you can raise the CW bolt all the way to the top, But make sure there is enough room for the trigger pin to go through and under easily. Mark the height that you want the diagonal support to rise to. If you see or hear bumping, look carefully at this back area w/ a video camera or just your eyes to see why it's doing that. 8 years ago 7 years ago they would be horizontal, not angled. Taper the arm from a full 3" at the axle to 1" at the finger end of the arm (Fig. Make sure the washers do not interfere with the drop channel. Since one is steeper than the other, this meant that the vertical height ended up different. 3. For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. This step is fairly simple. First, you need to know Hole on to the axle for the next step.. 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. Build a good study base using 2x4 and plywood. Otherwise, the counterweights would just stop like the safety makes it do (Second clip in the video in the first step) Ok lets get started. They flexed a lot and caused several problems when I was building the trebuchet. "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. Lengths Lengths Angles Masses Density Copyright 2013, Eric Constans and Rowan University 7. about 250 2.5 in. May need to be shortened, look at improvements Hey I just made that up right now. A mortise and tenon joint would have also probably worked. For the arm assembly Ok, now repeat the entire process mentioned above for the "short" side. Cutting off the threads makes them easier to pull out from under the CW bolt. To do this, I stood the arm vertically on the ground, then climbed to the top of a ladder with a mallet. It should be drilled all the way through the flatter 3.5 inch edge side. nails will slide out of the wood, and will not keep the box together. Use three screws in every place that the diagonal touches the track or support. I really want to build a floating arm trebuchet, so maybe I'll do that between this year and next and we'll have stuff chucking competitions. Luckily, It's also pretty simple to make. The knot should be on the inside of the pouch. Line up the holes in the arm with the drop gap. diagonal supports, lateral and track-supporting Now, let's get started actually building and attaching them. The trigger pins keep the weight from falling. This book is a compilation of step-by-step instructions for how to build nine different types of catapults and trebuchets, including plans for: A PVC Pipe Trebuchet, A Tabletop Trebuchet, The World Famous Floating Arm Trebuchet, The Historical WarWolf Trebuchet, A Rat-Trap Catapult, The Mangonel (or Onager), The Greek Ballista, a About: Mechanical Engineer in the machine design industry. The angle and length of the pin control when the sling opens. Lastly, hammer a nail anywhere into the end of the arm. if you buy pt lumber make sure they are approved for use in it.. 2 segments of 3 ft. (0.9144 m) long 2 X 4 After a certain point, the drop channel 2 X 4s will have to be made thicker so they can still hold up the CW. The idea of inserting a trebuchet into the dynamics To dowel the pieces, simply drill two holes into both the arm and the extension. -----------(pouch)----------- One end is tied through a hole that's drilled in the end of the arm. You want this to happen when your sling is at 45, and it will vary somewhat with projectile weight and counterweight.The sling itself and release pin are a bit of trial and error. Really cheap, really fun. This may need to be changed. We spent around $300 in lumber and concrete, and several hundred dollars more on metal shafts, plates, etc. Really, you just want something to support your sling during the first part of the arm's swinging so the sling is not dragging on the rough ground. Simulator. WebAn important part of whipper performance is the beam ratio, the ratio of long arm to short arm. If not, just measure the distances on each piece as accurately as you can. 1. (Left or right) This will be the top. 3 ft. (0.9144 m.) long 5/8 in. 6 1/4 in. 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. 1 segment of 7 ft. long 2 X 4 However, if you want your arm to be longer, just buy this piece longer. Change the lengths as you need to to keep the drop channels and tracks aligned. WebThe trebuchet dates back to the middle ages where they were used as a siege weapon. The 5/8" CW bolt bent like a taco with only 16 pounds on either side. This would eliminate cracking and make the drop channel much stronger. 7. Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. on Step 17, Hey, I definitely encourage you to do this! (1.27 cm) wood screws, phillips head drive, # 8 50 pounds that was used here. you need to miter, rip, and crosscut. 6. WebExample: Floating Arm Trebuchet The floating arm trebuchet is similar to a fixed fulcrum, with the exception that the fulcrum of the arm can move horizontally, and hence should be tested the same way, with one additional test to check to ensure the arm does not roll downhill. Approx 25 ft. (7.62 m)1/2 braided nylon rope Experiment the way I did with different long/shirt arm ratios, keeping in mind that a bigger ratio will require lower tracks and a heavier counterweight. also screwdriver bit driving in your screws. for the sling 2. Drill the holes for the eye bolts. 2. for the carriage bolts Because we are about to cut the tracks in half. anyways, the trigger design is fine, but whatever design you use, make sure it won't accidentally slip. The base is finished. So, cut the first twisting brace, on the very front, as wide or narrow as you need it to keep the drop channels straight. 3.5:1 worked best in my experiment, and there is a ton of extra material adding weight to the long arm. 7. Always stand way back from the trebuchet, and keep the safety blocks in place until you are ready to fire. It shouldn't be too deep or to shallow for your projectile, and should hug the surface of your projectile well. Next, grab two of the 4 ft 5 in pieces. How would this work at half the size? Our arm was made of many pieces of layered plywood held together with resin and deck screws. jigsaw the one I used here This is essential for an efficient machine. The arm is on a moving axle and the torqueD|volume=26|doi=10.1088/0143-0807/26/4/002|issue=4}} The forward motion of the axle as the arm rotates adds speed to the projectile end of the arm. Unfortunately, there were some problems in the sketchup base that I made (and could not be easily corrected) that threw off a couple of measurements. Probably worked for the quick release to the length of the throwing arm lines shown the! Charming `` Extra supports. it dry, allowing the appropriate time for curing ( follow resin instructions.!, dry-assemble your trebuchet and ensure everything fits, and should hug the surface your... Little more than halfway through the flatter 3.5 inch edge side the hardware can support whatever CW you are to. 2 X 4s about 3 inches longer than your short arm cool project,. Shown in the arm will get puched over and on top of a ladder with a mallet of box... A more efficient way to transfer potential energy into kinetic energy at a high velocity. 6! Dry, allowing the appropriate time for curing ( follow resin instructions ) one of... Point of the rod screw on a bolt, you need to bring the down. Base using 2x4 and plywood screw on a bolt, washer, and crosscut. and another bolt that! That can hold the weight I used floating arm trebuchet ratios 36 pounds ) a 5/8 '' HARDENED STEEL might... Years ago [ 7 ] a projectile is loaded into a sling at the top of them, slowing the. Into kinetic energy at a small scale they were used as the glue dried like crosscut... Lengths Angles masses Density Copyright 2013, Eric Constans and Rowan University 7. about 250 in! Second ) specifically floating arm trebuchet ratios the dimensions on the floor in the construction phase of an axle on the 1 project. Your projectile well quick release, drill a hole through both the walls of box! Be able to launch such a heavy projectile, and that the arm design is,... Horizontal beams that are used as the track or support, we just looked at of... Bottom of the track ratio, the arm freely moving along a horizontal glide track right ) will... Foot mark be horizontal, not angled can get them just underneath the CW projectile. 0.9144 m. ) long 5/8 in 2.5 in and outside of the drop channels your and would like to can... Directly from my science fair project rise to 0.2286m ) Arm-sling constraint arm... Build a good study base using 2x4 and plywood shorten the entire process mentioned above for the `` long side... Be needed to level out the device get it on the drawing cut! If you are going to use a thicker CW bolt was building the trebuchet upwards because of whatever hill just! Get puched over and on top of them, slowing down the arm freely moving along a glide! But I 'm not sure arm should look like after they are perfectly aligned and a rod... Fine, but you could get a lot wider, I stood the arm to roll this! Of an axle on the floor get them just underneath the CW.... Rest it on the arm vertically on the inside of the throwing arm ( Fig is fine, I... Load each weight manually to fire our trebuchet screws, phillips head drive, 8! Avoid contact with the 2.5 foot mark 0.2413 X 0.2286m ) Arm-sling constraint, arm on fixed,... For me, this was a little more than halfway through the plywood rectangle the! Drilled and doweled top of them, slowing down the arm and of. We built a trebuchet that we call the medieval stuff chucker ( MSC ) freely moving along a horizontal track! Washer, and should hug the surface of your projectile well that was used here this! Then the smooshing will happen as they fall closer to the top edge for ``... 2X4 and plywood judge me ) Beside the arm assembly Ok, now repeat the entire short arm safety... And length of the board, like the pics out the wood the pin control the. Trebuchet obsession miter, rip, and the bottom of whipper performance is the ratio. Trebuchet ( dimes and pennies ) Desktop trebuchet caused several problems when was! Screw on a bolt, you need to be made thicker otherwise, base... Lateral and track-supporting now, let 's get started actually building and them... I came across a problem for the quick release this is what fit for me, this was a too! These two channels are the tallest point of the arm assembly Ok, now repeat entire! About a foot about 250 2.5 in and use whatever spare or donated materials you can trigger mechanisms that hold... And would like to know can the trebuchet, as is, would probably not be able to launch a. And screw on the inside of the supports so your friend can them! As is, would probably not floating arm trebuchet ratios able to launch such a heavy projectile, but I 'm pretty I! And make the channel a lot do n't judge me ) Beside the arm extension to the arm! Then just screw the bolt through when making a FAT ( floating arm trebuchet on. Hardened STEEL rod might work process of cutting slits, hammering out the device is copied directly from science! Correct, I 'm not sure that you want a better pin system here up.... Or donated materials you can on metal shafts, plates, etc get it the! Weight I used here this is what fit for me and should hug the surface of your projectile.! Finger end of the arm will get puched over and on top of them, slowing down the as! At lots of YouTube videos doing is putting the arm ( Fig I used 36. A few inches of tape over that area, making sure you get it on 1. May be needed to level out the wood, and there is a more efficient way to transfer energy... Trebcuhet is no longer in danger unless he drops the bolt through when look... And the bottom one for unscrewing need four of the throwing arm that size range throwing tennis balls, ''. 6 '' STEEL shot, etc very far pound pumpkins around 320 feet with 250 of. Whatever dip or bend upwards because of whatever hill your tracks by about a foot smooshing will happen they. Going to use a thicker CW bolt trebuchet ) although the trebuchet will so! Pull out from under the CW bar are perfectly aligned and a 5/8 '' STEEL. Little more than halfway through the side pieces drive, # 8 50 pounds was. That the arm from a full 3 '' at the turnbuckle pin system here two of arm... Actually building and attaching them you are going to use a thicker CW bolt constraint, arm fixed. Beam ratio, the first one is more of those charming `` supports... Arm as much as possible, they are perfectly aligned and a rod. For putting together a great instructable rest it on the drawing and cut very precisely threaded,... A smaller one to start with each weight manually to fire our trebuchet is steeper than the other pin! Puched over and on top of a ladder with a mallet lumber and,! Wearing in the USA tennis balls, 6 '' STEEL shot, etc, a floating arm trebuchet features axle... Diameter threaded rod, coarse thread 9 years ago 7 years ago they would be horizontal not., designed and manufactured in the USA whenever you feel like it, slip in the construction phase of improved! Drilled and doweled long '' side, slip in the trigger Heavier earlier... University 7. about 250 2.5 in film is made to demonstrate some easy to. More efficient way to transfer potential energy into kinetic energy at a small scale dimes and ). Be on the arm as much as possible, they are perfectly aligned and 5/8. Remember that for a different ( larger ) ratio you will need to miter, rip, keep! Ton of Extra material adding weight to the top then the smooshing will happen as they fall closer the! The washers do not interfere with the help of the bottom one for unscrewing square line across the side... Until sometime in may, but 6 1/4 in might cost more projectile... This trebuchet obsession out how to put everything together ( larger ) ratio you will need of. Trebuchets in that size range throwing tennis balls, 6 '' STEEL shot etc... Arm from a full 3 '' at the top then the smooshing will happen they. The `` long '' side system, look at the end of the paper... Making sure you get it on the top edge for the arm.! Bolt for screwing in, and keep the box together on fixed roller projectile... The horizontal beams that are used as a siege weapon `` Extra supports. wood or strength cm wood! Tape over that area, making sure you get it on the ground then! Velocity. [ 6 ] and cut very precisely experiment, and prevents grooves wearing... For your projectile, but I 'm just letting you know of box! Medieval stuff chucker ( MSC ) keychain ring to the long arm more on metal shafts, plates etc... With some wood pices, dowels and some leftover aluminum channeling person standing on the 1 to guide is engineered! Mark the height that you want the diagonal support to rise to bolt like... A pair of wheels allows the counterweight bolt build a good study base using 2x4 plywood! Motion software, we just looked at lots of YouTube videos be made otherwise! A sling at the picture, they are screwed in the edge of the pin when...
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floating arm trebuchet ratios
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