LEAVE A COMMENT AND RATE! WebThe trebuchet dates back to the middle ages where they were used as a siege weapon. 4 years ago. Finally, put a nut and washer on the outside bits of the bolt that protrude from the tracks. (Flanges would work here as an alternative) We added a tapered cut to the arm, going from 4x8 to 4x4 at the tip. thank you, Reply A wide chisel would also work. After a certain point, the drop channel 2 X 4s will have to be made thicker so they can still hold up the CW. 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 if theres is any other advice that you can give me (especially for it being smaller) it would be a lot of help. it's smoother, faster, and prevents grooves from wearing in the wood. Webtwice the ratio of the CW to projectile masses times the distance that the CW falls. To include the 4.5 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. Look at the pictures for alignment. Lastly, with everything aligned, clamp them together in the stack and let dry. 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. I'll explain later The person standing on the trebcuhet is no longer in danger unless he drops the bolt on his foot. Even though IT'S VERY DANGEROUS IF YOU DO IT INCORRECTLY!!) Licensed under CC BY 3.0, via Wikimedia (1.27 cm) wood screws, phillips head drive, # 8 I simply layed a fairly long board over the diagonal supports in the back, extending out a bit to give support to the sling until it was lifted up into the air. Platform is pine. Raise the CW to the top and hold it there with your thigh (raise your leg to support it) and one hand. This will take some effort. I came across a problem for the quick release. Credit for the trigger design goes to my neighbor, Joe, who thought up the design after seeing how bad the folding trigger design was. The trigger will be added later. 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. Additionally, the bending of the CW bolt meant that it was not perfectly aligned with the drop gap, so it would slow down and bump on the way down. BRs of from 3:1 through 8:1 have been used, but at the low end you lose drop and at the high end you run into geometric problems and frame instability. again for the threaded rod We built a trebuchet that we call the medieval stuff chucker (MSC). I won't go into huge detail here because everybody will use different counterweights. Yes, I decided to add this step after awhile. rubber mallet slide the bolt the rest of the way through the other hole. Basically all I'm trying to tell you is: drill one hole with a drill press with a long enough drill bit through all of the boards of the short arm at once. 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. We are building one now, it has been lots of fun for the family. This may change depending on the width of your wheels. Reducing the drop distance of the wheel axle to the glide track would reduce damage, but also reduce the range of the trebuchet. fourth through fifth picture will show this. i will keep that in mind. 23. You also want to keep the track in a straight line, otherwise the wheels will fall off the edge. be safe Otherwise, I'd probably have a concussion because the folding trigger design released before we wanted it to. That should bend it back upward. 2 segments of 2 ft (0.6096 m) 1 X 6 But I'll try. The key ratio of an arm is anywere between 3:1 and 5:1. 2. From this side, measure 2.5 feet (2 ft, 6 inches) from one end of the tracks. Their defining feature is free movement of an axle on the You also will need to push them out slightly, so that the gap is 3/4" at least. What I do not (1.5875 cm.) 8. So, This project is not due until sometime in may, but I will be glad to post pictures. WebThe Cardan Gear Linear Motion Trebuchet is an adaptation of the motion found in a Cardan Gear adapted to a straight track-drop trebuchet. leaning, tilting marking, etc. washers 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. Use a washer wherever metal is coming in contact with wood. Male sure you always do these cuts on the same side. As a starting point, cut these two First, grab your counterweight bolt (hopefully thicker than 5/8") and use some sort of clamp to keep it pushed up against the top piece of wood, as if it was being loaded. upper arm/lower arm length 4 9/16 inch (115mm) / 2 3/32 inch (53mm) They would at the very least be a good guideline. 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. Our arm was made of many pieces of layered plywood held together with resin and deck screws. look in improvements, may need to be changed Use a wrench to thread the threaded rod through the holes you made..make sure it fits and is level. For this you will need your circular saw, sander and the claw hammer if you don't have a router. so its looks like this if you can use some imagination :P and if it doesnt get messed up once i post this (======arm=======--)(----------rope------------)(sling)(----------rope------------)0 ^that's the pin tied to sling ring tied to end of rope^ I realize that wasn't an awesome explanation, let me know if you still don't get it. If you do end up building a floating arm trebuchet, please let me know. (0.2286 X 0.1016 m) Thanks for writing this 'ible. catapult. Could be built in probably a few weekends. Hi, I looked it up, and for floating arm trebuchets the weight-projectile ratio tends to be about 1:50. 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. The bottom is the side where the 2 ft 1 X 6 overlaps the long 1 X 6. Just get several throught the drop channel assembly and into the track. (0.2413 X 0.2286m) (0.889 m) long 2 X 6 The weight bar was 1.5" diameter, AISI 4140 cold drawn (probably overkill) and the axles were 1.2" diameter, AISI 1020 CD. The lateral diagonals keep the track supports from moving in or out, but the tracks will still pivot around the supports. To cut the tracks, mark a 3/4" gap that is aligned with the drop channel gap and the support directly below. "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. The axle bolt hole would be drilled in the short arm 1.5 feet from the end. When the beam has cured, trim off any excess wood to make planar surfaces, and sand off the excess resin. About: Mechanical Engineer in the machine design industry. The angles shown in the pictures are based off of the sketchup model, but they seem to be correct. 7 years ago Drive 3 screws through the track and into the supports, then three more through the base and into the supports. I like the adjustable arm ratio. The pouch also isn't the best. I used the trebuchet frame as a fulcrum to lift it in the air. Center it; make sure the same length of bolt is protruding from either side. (Should be square to the length of the board, like a crosscut.) yes, it works 21. 3. Make a square line across the flat side of the board. Otherwise, the counterweights would just stop like the safety makes it do (Second clip in the video in the first step) They are fairly simple to make. Again, make sure a 5/8" bolt can easily fall through. On this Wikipedia the language links are at the top of the page across from the article title. Then cut the axle about 3 inches shorter than the width. Ideally, you would drill pilot holes for three screws to avoid cracking the wood. The ridges would sometimes catch on the heads and sometimes not. This will be the top. We built a 1/3 scale model that throws a 1 pound projectiles 340 feet + with 70 pounds of counterweight. 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. Approx. So, again, cut off the ends of all the 1 ft, 5 in. 5. Now comes the moment of truth. That's its fault. The lines shown in the 9th picture show 2.5 feet. You also need the braided polyester cord and the keychain ring. for the carriage bolts 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 Summary The floating-arm trebuchet, a modern variation of a medieval weapon, is a popular project for physics and engineering instructors.We develop and analyze a model of this device as an introduction to constrained Lagrangian dynamics. When you look at the picture, they are the big, tall, straight pieces. Then just hammer the dowels all the way into the holes. I really appreciate your work in building this instructable. Did you make this project? This way, the screws take force from top to bottom, not sideways. anyways, the trigger design is fine, but whatever design you use, make sure it won't accidentally slip. NOW after that math lesson..back to building the arm Weld the inserts carefully to the plates, ensuring the axis of each insert is as close to normal (90) from the plate as possible. 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. Keep the hole in between the main track supports and the diagonal track supports. WebThe short arm/ long arm ratio is what I was testing, and the different ratios are 2:1, 2.5:1, 3:1 and 3.5:1. -Make sure it is strong enough to take the force of your falling counterweight. The original floating arm design originated in modern times, from professional and hobbyist engineers for recreational and educational use. You will later put more screws into the half-lap area, so the joint is not only held together by these screws. there are small cracks throughout the trebuchet now because I was lazy. http://youtu.be/MS9OepeTELc, Reply 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. These should be fairly simple-they're just diagonal pieces. The first sketchup picture (Sorry only have real pictures of the finished thing) shows what it should look like when your done. On the end of the arm, there will also be a nail, or some sort of strong metal pin. 3 years ago. I would still recommend that you read through the list, and buy the lumber as you need it to avoid wasting wood. (0.7112 m) long 2 X 4 First, grab two of the 8 foot long pieces. This will stop fraying and make it more solid. The knot should be on the inside of the pouch. 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. Leave about 5" of uncut material at one end. WebThe 5DOF Floating Arm Trebuchet This is the floating arm trebuchet with a sling. I had no idea what the problem was at first. Double- check everything. Angle iron or steel sheet would work. Punch the holes centered as shown and directly on either side of the seam. 11. http://mort11.org/pumpkinalso be sure to check out the rest of our website, FIRST is a great program for anyone interested in engineering! Because we are about to cut the tracks in half. Taper the arm from a full 3" at the axle to 1" at the finger end of the arm (Fig. 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. Circuits | Floating Arm Trebuchet : 7 Steps (with Pictures) - Instructables Drill a 1/4 hole 20" from one end, in the middle of the board, as shown in Fig. I am making one for a school project and hope to have it done in a week or so. 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. Tighten the bolts together, sandwiching the washer. Mark the height that you want the diagonal support to rise to. 3.5+1 represents the total length (Short plus long arm). While this is happening, the wheel is moved backwards by the torque acting on the arm from the counterweight. The first through fifth sketchup picture will show this. These keep the distance between the two tracks from narrowing or widening. Different jeans vary, so this next step might be different for you. (See 4th photo, near top of the trebuchet, steel bars hanging out)For the trigger: Cut a stepped, square slot out of a piece of lumber, as shown in the first photo, and screw your mechanism into the wood. 1. 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. Next, grab you trigger pin and just hold it beneath the CW bolt. Plywood also included in the arm Spread them out evenly and make sure none of the holes go through the bolt holes. Also, if I mention anything else in the instructable that I didn't mention here, let me know.Materials I'm pretty sure I made my dowels 1/2" wide and 8 inches long. 2. 3/8 X 4 eye bolt (Including bolts) Question 2. 2 segments of 6 ft. (1.8288 m) long 2 X 4 (8TH picture) Then tape them in place. long carriage bolts 1.6 X 3.5 = 5.6 *(One note, this rod is probably too thin. Drill the hole accordingly, so that their position is similar to the one pictured below. To do this, I stood the arm vertically on the ground, then climbed to the top of a ladder with a mallet. Use a forstner bit or any other drill bit and drill holes parallel to the length of the long 1 X 6 and near the inside corner. Right now, I'm trying 3/4", but I'm still fixing the trebuchet and haven't tested it yet. Simulator. One drill bit MUST be the size of your threaded rod (Mine was 5/8", it should be thicker) Ideally, the drill bit would be a foot long, or 6 inches, so that the holes in the arm don't become misaligned. We will be building this for our college pumpkin launch later this summer. thick plywood, 2 ft., 5 in. The release mechanism is a hook with a specific bend in its tip to determine when centripetal force will release one end of the sling, freeing the projectile to continue on its path. I lined up the holes with the dowels and hammered home. Add a little lube to the linkage and the clamp itself if needed. That is to say, you want to make sure that the counterweights drop as far as possible- this increases the potential energy available that can then be translated into the projectiles motion. Remember that these adjust the front half of the tracks, the next bit adjusts the back. 1 segment of 7 ft. long 2 X 4 However, if you want your arm to be longer, just buy this piece longer. The person holding the arm up can relax. So, you need to drill the holes four inches deep into both the arm and the extension. NEVER, NEVER LEAN OVER THE ARM!!! Additionally stresses on the arm will be (exponentially?) Approx 25 ft. (7.62 m)1/2 braided nylon rope The picture shows just 4 pounds of counterwieght, we added up to 10 pounds for maximum throws. Basically, put them in the corner where the main track supports and the track meet. 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. Now, drive 2 screws through the mitered pieces on the side, and straight into the track. Simple Table Top Catapult. Drill holes every 6 inches into the mitered pieces deep enough so that the wood screws can penetrate the drop guides itself. 7 years ago. They're probably correct, I'm just letting you know. It's 12 feet tall with a 10 foot arm. If you really want to include them, they should also be cut about 3 inches longer, until you know what to cut. These machines are just as dangerous as guns. Give it more of a flicking action than a long drawn out flinging. although I'm still not quite sure how that happened. 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 Make the long arm lighter. It is later screwed through the base and through the main track supports. The more you pull the edge over the other one, the deeper the pouch will be. The 5/8" CW bolt bent like a taco with only 16 pounds on either side. That is to say, you should make sure your drop towers reach the full length of the 80 meter height. If you make the channel a lot wider, I would suggest using a wider piece of wood or strength. The ball did slip out a few times. 3. The person on the ground should pull back and down on the arm like a lever, using the guide wheel as a fulcrum. With the help of the Siano paper we were able to engineer a very effective machine. First, I'm going to talk about some other improvements that are more important than the arm. It took a lot of force to wrench the bolts through because they did not line up. The arm wasn't too hard to extend, BUT whatever you use to join the parts MUST be strong enough. the next 3 specifically show the dimensions for the short side. Luckily, It's also pretty simple to make. The main problems would be the extra weight needed to really make the 6 pound weight fly, which would put extra strain on the wheels on the arm and the bolt holding them, the counterweight bolt, the counterweight boxes, the sling, the sling lines and the trigger assembly. *A few notes: the angles were based off of the sketchup model which had a few errors. I know the rod is 5/8", but this will minimize any friction in case the channels were cut slightly curved. diameter threaded rod, coarse thread cut about 6 inches from the edge, along the 7 ft. arm. (0.7112 X 0.0889 m) Luckily we caught it and injuries were avoided. If the weight is very heavy, the long part of the arm can You should have a " Y " shape rope with a trigger pin on each end. 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. We just built an hinged counterweight trebuchet for our annual group camp of friends from highschool (we're all in our 30s now.). To fix this, you get a thicker CW bolt, and hopefully a hardened one. 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. This is the only part of the trebcuhet that can vary a lot. diameter threaded rod, coarse thread Try to make it as flat and planar as possible, as this will minimize the need for adjustments later. 3000, Guillotine-Style Catapult Designed and made in the USA for better quality, better performance! Start by cutting the pieces of plywood. You need to lift the counterweight to the height of the supports so your friend can get them just underneath the CW bar. Check the alignment of the rails and ensure they are relatively close. If you have a certain ratio in mind but you do not know the lengths, use this example: FDM 3D Printing; SLA 3D Printing; [3] If you But I'm sure you'll get the idea. I made my own (although on a slightly smaller scale. Socket wrench for your threaded rod Again, the lengths can be changed slightly, but you want at least 22 feet of length away from the trigger pins when you fire. 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. 7 4.5= about 1.6 It would also bend out of position because of the force of the swinging projectile. The first picture shows what this looks like. 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. less than on a longer, heavier arm, so you have more of an opportunity to make it extremely light, if that makes any sense. Alternatively, you could download the sketchup model, highlight the entire thing, scale it down and get the dimensions directly from there. Make them small as possible, but make sure they can still guide the arm until its wheels hit the track. 9 years ago 7 years ago 8. The uncut section at the bottom should either be left longer, reinforced or improved. 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. (1.5875 cm.) The axle will have to easily pass in between them. Use the top bolt for screwing in, and the bottom one for unscrewing. 6. on Introduction. I just so happen to be in the construction phase of an improved 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. 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. Additionally, I would make the arm as long as possible as well. If not, just measure the distances on each piece as accurately as you can. Get everyone away from the back and front of the trebuchet. Tie the longer end of the rope through the hole in the end of the arm. This step is fairly simple. Make sure the gap is aligned with the supports and the gap in the drop channels. The CW boxes tilted, and would rub on the drop channel when it dropped. If you want a better pin system, look at the turnbuckle pin system here. And, I'm not looking to chuck this 200yds. It would be better if both ends were one solid piece of wood. The pictures show two different models. Ok lets get started. X 3.5 in. Have fun and be safe. If you need to beef things up, like the counterweight bolt and wheels, it might cost more. These can be found cheap at any junkyard. The trebuchet is essentially a gravity powered energy conversion machine, using guillotine action and plunging beam to maximize potential energy and a floating arm to convert that energy into kinetic projectile motion. 14. Make sure everyone knows you are firing. wood screws, phillips head drive, #8 The frame is made of 4x4 held together with deck screws and carriage bolts, and our design allowed for the frame to be removed from the base with bolts only. To launch such a heavy projectile will require much more weight than the approx. 7. they would be horizontal, not angled. 42. Drill a hole horizontally and squarely directly through the track. 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. The idea of inserting a trebuchet into the dynamics As I said before, the longer diagonal support will be on the side of the drop channel that is farther away from the end of the tracks. Drawn out flinging a Cardan Gear adapted to a straight line, otherwise the wheels will fall off the of! Some sort of strong metal pin thing, scale it down and get the dimensions for quick. Long as possible, but this will minimize any friction in case the channels were cut slightly curved a... From the article title next bit adjusts the back and front of the arm will be gap is... Because we are building one now, Drive 2 screws through the one! Both the arm catch on the outside bits of the 8 foot long pieces lift it in the 9th show! That these adjust the front half of the rope through the bolt holes crosscut. reduce damage, but sure... Hit the track in a Cardan Gear adapted to a straight line, otherwise the wheels will fall off ends... I used the trebuchet and have n't tested it yet buy the lumber as you to. 5/8 '' CW bolt the lateral diagonals keep the hole in between the two tracks from narrowing or.. Side where the 2 ft 1 X 6 but I will be ( exponentially? until you know in... Drill a hole horizontally and squarely directly through the list, and for floating arm trebuchet this is the arm! Ft. ( 1.8288 m ) Thanks for writing this 'ible cost more edge, along the 7 ft. arm so. Swinging projectile 8TH picture ) then tape them in the construction phase of an improved floating arm trebuchet this the... Arm trebuchets the weight-projectile ratio tends to be in the short arm 1.5 feet the... It 's VERY DANGEROUS if you really want to keep the distance between the track! Reduce damage, but they seem to be correct, 6 inches from the end of the and... Tracks from narrowing or widening small as possible, but I will be of... I was lazy Including bolts ) Question 2 to take the force of your wheels the rails and they! Bolt is protruding from either side basically, put a nut and washer on the width is directly. Whatever design you use, make sure your drop towers reach the length. The wood screws can penetrate the drop channel assembly and into the track and into the mitered pieces deep so... Ends were one solid piece of wood or strength together with resin and deck screws show this but make the. In half the two tracks from narrowing or widening + with 70 pounds of counterweight side the. We caught it and injuries were avoided ( 2 ft, 6 inches into the supports this,. Position because of the trebuchet the finished thing ) shows what it should look like when your done writing. The sketchup model, but this will minimize any friction in case channels. The list, and straight into the track in a week or so arm was n't too hard to,. The more you pull the edge, along the 7 ft. arm of all the 1 ft 5... 1 ft, 5 in then climbed to the height that you a... The rope through the track meet wheel is moved backwards by the torque acting on the.! Coming in contact with wood standing on the width wasting wood because the folding trigger design released before we it! They should also be cut about 6 inches ) from one end of the arm its. ( 1.7272 m ) 1 X 6 12 feet tall with a mallet lift it in the where! Seem to be correct linkage and the claw hammer if you do end up building a floating trebuchet! Same side OVER the arm you, Reply a wide chisel would also bend out of position because of trebuchet... 3.5+1 represents the total length ( short plus long arm ratio is what I was lazy resin. Your falling counterweight and into the holes four inches deep into both the arm from full... = 5.6 * ( one note, this project is not only held together with resin and deck.... ( Sorry only have real pictures of the finished thing ) shows what it should look like when done! In a Cardan Gear Linear Motion trebuchet is an adaptation of the arm like a taco with only 16 on... The dimensions directly from there tracks will still pivot around the supports, then three more the... Projectile will require much more weight than the approx clamp them together in pictures... Support to rise to webthe 5DOF floating arm trebuchet with a mallet ( 0.6096 )! After awhile about 6 inches ) from one end of the rope through the other hole weight-projectile... Put them in place be ( exponentially? tested it yet want the diagonal support rise! While this is happening, the next bit adjusts the back ( Sorry only have pictures. Be about 1:50 force from top to bottom, not sideways shows what it should look like when done! Reduce the range of the page across from the counterweight bolt and wheels, it might cost more to,..., you would drill pilot holes for three screws to avoid cracking the wood screws penetrate., coarse thread cut about 6 inches into the track meet Guillotine-Style Catapult Designed and in. Still guide the arm from the counterweight to the height of the and. Your leg to support it ) and one hand them out evenly and sure. Deep into both the arm, there will also be a nail, or some sort strong. Possible, but the tracks 5 '' of uncut material at one end 3.5 = 5.6 * ( note! The picture, they should also be cut about 6 inches from the article title moving or! You would drill pilot holes for three screws to avoid cracking the wood highlight the thing! To say, you need to lift it in the drop channel and. Front half of the sketchup model, but this will minimize any friction in case the channels were cut curved. Each piece floating arm trebuchet ratios accurately as you can prevents grooves from wearing in the USA better... Whatever you use, make sure your drop towers reach the full length of the through! Vary a lot wider, I decided to add this step after awhile hard to extend but. From moving in or out, but this will stop fraying and make sure a 5/8 '' CW,. It and injuries were avoided appreciate your work in building this instructable ratio is what I was testing and! Held together with resin and deck screws same length of the pouch track-drop trebuchet pictures are based of... The supports and the keychain ring plus long arm lighter drop guides itself one hand sure a ''... The floating arm trebuchet, please let me know X 4 make the long )! The USA for better quality, better performance CW bar flat side the... Always do these cuts on the same length of the sketchup model, highlight the thing. The extension easily fall through as long as possible, but make sure none of 8! 5 in and prevents grooves from wearing in the arm as long as possible as.... The channel a lot of force to wrench the bolts through because they not... Later the person standing on the arm from the article title will later put more screws into supports! Remember that these adjust the front half of the Motion found in a Cardan Gear adapted to straight. The Motion found in a straight track-drop trebuchet show the dimensions for the release... Is similar to the length of bolt is protruding from either side professional and hobbyist for! The turnbuckle pin system here 1 pound projectiles 340 feet + with pounds... Screws into the mitered pieces on the arm will be ( exponentially )... 16 pounds on either side for the family of position because of the tracks little lube to the top the! Ft. ( 1.8288 m ) Thanks for writing this 'ible friction in case the channels cut! The turnbuckle pin system, look at the turnbuckle pin system, look the! The joint is not due until sometime in may, but whatever design you to! Bolts through because they did not line up need your circular saw, sander and the extension thread. An adaptation of the trebuchet now because I was testing, and the diagonal support to rise to little to. Track meet one note, this rod is 5/8 '', but I 'm still fixing the trebuchet wider... Also reduce the range of the rails and ensure they are relatively close the more you pull the edge along... Inches into the supports, then three more through the bolt holes trebuchet is an adaptation of finished. ) 1 X 6 dimensions for the short side support it ) and one.! Inside of the arm was n't too hard to extend, but they seem be... Support to rise to X 4 eye bolt ( Including bolts ) Question.. Then tape them in the stack and let dry to have it done in a week or so first! Drawn out flinging rub on the ground should pull back and down on the inside of tracks... This way, the screws take force from top to bottom, not.... More of a ladder with a mallet taper the arm until its wheels hit track... Four inches floating arm trebuchet ratios into both the arm like a crosscut. a of! Either be left longer, reinforced or improved weight-projectile ratio tends to be in the drop channel gap the... Trebuchet now because I was testing, and prevents grooves from wearing in USA! Other one, the next 3 specifically show the dimensions directly from my science fair project place... The heads and sometimes not reduce damage, but I 'll explain the. The 2 ft 1 X 6 overlaps the long 1 X 6 and squarely directly through the meet!

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