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. 5. Beside the arm when it's at rest, these two channels are the tallest point of the trebuchet. When you look at the picture, they are the big, tal slide the bolt the rest of the way through the other hole. A pair of wheels allows the arm to roll along 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. 2 segments of 2 ft. (0.6096 m.) long 5/8 in. For the trigger you will need the: Remember that for a different (larger) ratio you will need to shorten the entire short arm. Try to make it as flat and planar as possible, as this will minimize the need for adjustments later. Arm-sling constraint, arm on fixed roller, projectile on ramp. Mark the height that you want the diagonal support to rise to. wood screws, phillips head drive, #8 Simply miter off each edge at a 45 degree angle, so that the piece is the shape of a trapezoid. I am making one for a school project and hope to have it done in a week or so. A wide chisel would also work. 2 segments of 2 ft. (0.6096 m) long 2 X 4 Otherwise, The arm will get puched over and on top of them, slowing down the arm a lot. (6.35 cm.) You need: It should be easy enough to follow. (third picture on the right) RLT industries trebuchet.com Leave about 5" of uncut material at one end. excellent site for cheap, strong wheels http://www.thecasterguy.com/ 8 .5 in. The classic beam ratio for a FAT is 2:1. To reset the device, the counterweight must be raised back to the original height and locked in with the trigger mechanism. Mark the line directly across the flat face of the track, perpendicular to the long edge. 10. 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. So, if you want them to be the same height, you may need to change the angles or the lengths mentioned here. .and several of the bolts for the 5/8" threaded rod. It's the same process of cutting slits, hammering out the wood and sanding it smooth. If you have a certain ratio in mind but you do not know the lengths, use this example: Have someone stand at the back of the trebuchet, next to the arm (To the side) it just over 24 inches tall I can provide more detailed dimensions, advice, and tips if you wish, just let me know. NOTE: all CAD modeling was done using student software, for educational purposes. I'm still not sure. The arm is the key part in the trebuchet, as it provides the momentum, the height, and contributes to the angle of release. Axel for the masses is coathanger wire but ensure the axel never absobs the full impact of the falling masses as it will bend. You also might want to improve the pin system-at least make sure your pin is smooth. For me, this was a little more than halfway through the side pieces. 11 years ago I won't go into huge detail here because everybody will use different counterweights. So, again, cut off the ends of all the 1 ft, 5 in. Lastly, hammer a nail anywhere into the end of the arm. Then very carefully you will have to put in the safety blocks again and reset the trigger. (if you do it, let me know; I'll tell you how to make fireball projectiles), 7 years ago Next, lay the 7 foot piece on top of the stack of three, and letting the end of it rest on the pile of scrap wood to keep its height even and parallel with the three pieces that have been glued. I haven't seen much information on dynamic tuning for the f2k, but we did an estimate of the static loads at the critical points and kept the stresses around 1/4 of the yield strength of the steel.I'd also advise implementing a metal sheet on the rails, instead of bare wood. on Introduction, The length of the end of the arm to the center of the sling should be 1/2- 2/3 the length of the entire arm. A small-scale replica of War Wolf, a counterweight trebuchet that uses a boulder-holding sling at the end of a swinging arm. Tools Just on top of the tracks. Hole on to the axle for the next step.. drill (The one I used here came in a kit here) with a varied drill bit set, for pilot holes, etc. 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. Bending Braces. Drill a hole somewhere near the end of the armit doesn't matter, but it should be at least 3/4" from any edge. 2 segments of 6 ft., 2 in. 7. simplest step. grab the last 3 ft, 6 in 2 X 4s. Line the short edge up with the 8 ft piece of the drop channel. They have the same orientation a Take off the drop channels completely so you can cut through here. And back up at least 20 feet when firing (The sides are safest) A mortise and tenon joint would have also probably worked. Onto one end of the rod screw on a bolt, washer, and another bolt in that order. The angle and length of the pin control when the sling opens. This is essential for an efficient machine. washers This is the hardest part of loading. But I'm sure you'll get the idea. Parallel to the seams, cut all the way through so that you can open it into one sheet. diameter threaded rod, coarse thread The arm slowed down a lot, and the ball spit out the back. Wheels are from the rotating platform from a microwave but any small stong wheel will do. (This is actually for the trigger) Webagain revised in spring 2002 with the introduction of the Floating Arm Trebuchet. Ok, find a flat surface and 3 scrap pieces of 2 X 4. And it is constructed with 1 X 6s Today they are used mostly for recreation and education. Threee previous sections are for the counterweight boxes. These will be the drop channels Approx. Put a generous amount of glue on the flatter side, the 3.5 inch side. Consider how much weight you want to use, and size your shafts and frame accordingly. Or you could buy a longer beam to begin with. The pouch also isn't the best. I lined up the holes with the dowels and hammered home. (Safety blocks explained later) There's tons of assumptions involved there (what's the drag coefficient of a pumpkin? For my project, I had to make the short arm long enough to fit the counterweight holes. This kit is professionally engineered, designed and manufactured in the USA. The CW boxes tilted, and would rub on the drop channel when it dropped. when the counterweight is raised, the trigger pins are slipped through one eye bolt, under the counterweight bolt, and through the other eye bolt. If you really want to include them, they should also be cut about 3 inches longer, until you know what to cut. Try to have all the sizes of your shafts and designs for your trigger and sling release figured out at this stage, as well as how you plan to attach the shafts (welds or flanges, etc). At the current position they dont utilize all of the work you did lifting your weights.Here is a floating arm that two other students and I from FRC team 11 MORT designed for punkin chunkin in Delaware. First, pick one end of the trebuchet to be the back. Whenever you feel like it, slip in the other trigger pin, with the eye toward the front. They should be about 2.5 feet tall. *look at the last step: improvements. If you want to, you can glue the joint, but only if you are sure you won't need to take it apart later. be safe 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. on Introduction. When the trebuchet is placed on an uneven surface, the base will sag into whatever dip or bend upwards because of whatever hill. They would extend outward, just like the board chute. Then just bolt it all upYou can look at and copy my bolt arrangement if you don't really know what to do. The frame is made from 12mm diameter square cross section pine (I used a about 2.4m). This is only to coutersink the screws, do not drill the hole all the way through. X 1.5 in. 3/8 X 4 eye bolt (Including bolts) You will need the two 2- foot lengths of 1 X 6 and the two 6- foot lengths of the 1 X 6. Because we are about to cut the tracks in half. 15 in. Line up the pieces of plywood and drill holes through everything for the carriage bolts. Finally, tie the keychain ring to the slightly shorter rope. You also need the braided polyester cord and the keychain ring. (2.54 cm.) 1. pretty simple step. This film is made to demonstrate some easy steps to go through when making a FAT (Floating arm trebuchet). When the beam has cured, trim off any excess wood to make planar surfaces, and sand off the excess resin. 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. This may need to be changed. I have to study your plans before I decide whether to tackle such a project, but at first blush, I am impressed. Additionally, I would make the arm as long as possible as well. Place your projectile in the sling. Our shafts were steel bar. Make sure they are placed correctly, and make them as square as possible to the base. Drill holes every 6 inches into the mitered pieces deep enough so that the wood screws can penetrate the drop guides itself. The hardest part, really, is getting the angles correct and then cutting them accurately. Webfloating arm trebuchet ratios. these are the trigger pins 50 pounds that was used here. 10 years ago Grab your nylon rope and cut 4 feet off the end. Then fold in on top of the other one to crinkle the pouch into a more pouchy shape. Lastly, with everything aligned, clamp them together in the stack and let dry. If not, just measure the distances on each piece as accurately as you can. Webi'm working on a quick sketch for a floating arm trebuchet i'm making in an engineering class and need help selecting and using the correct mate tool in the on shape assembly tool. on Step 15. diameter threaded rod, coarse thread 4. Here's some vid of ours. 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 and if everyone wants the step I'll add it. WebThe 5DOF Floating Arm Trebuchet This is the floating arm trebuchet with a sling. Approx. Use three screws in every place that the diagonal touches the track or support. on Introduction. so: I recommend using a pin, then a thick nail, then a screw and finally a pencil to widen the hole for the string. Luckily, I eventually lined up the holes. While this is happening, the wheel is moved backwards by the torque acting on the arm from the counterweight. on Step 17. Grab the trigger pins. I did not have a drill bit long enough to go through all of the 2 x 4s of the short arm, so I had to drill individual holes in each individual 2 X 4 and hoped that they lined up. (1.8796 m) long 2 X 4 There are two main safety mechanisms: The safety blocks, which prevent the arm from falling, and the second is common sense. At the tip of the arm, we welded a steel box around it to hold the pin for the sling release and a loop to tie the other end of the sling rope to. Lemme know how to improve the instructable Use a bowline. WebThe optimal ratio between the long part of the arm and the short part of the arm will depend mainly on the Mass of Weight. Short arm, washer, bolt, washer, wheels and bearings, washer, bolt. speed square And, I'm not looking to chuck this 200yds. (0.889 m) long 2 X 6 WebFloating Arm Trebuchet - Hobbyist Version The F.A.T. Look at the pictures for alignment. Make sure everyone knows you are firing. Push them up against the drop channel. Cut at least 3 inches longer unless you are very good at cutting angles accurately (A miter saw would help)\ You done They should come out easily if they were cut narrowly enough. Otherwise, the arm would derail a lot more. The pin is made of all thread, 1 ft long, with the threads on the end ground off. look in improvements, may need to be changed [3] If you Width was around 2 feet, I think. long carriage bolts I would like to work on the floating arm trebuchet because the design of it is more interesting and D I wish I'd have seen yours before we designed it, I went with a 2:1 ratio for the arm, and we may have been able to make it a bit longer. This thing is powerful, which is why you need a trigger. Did you make this project? The floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. If you can't get it to the top in one shot, use the supports. The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. 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. 1 X 6s flex alot. Stick a few inches of tape over that area, making sure you get it on the inside and outside of the seam. 7. If you have a router, it would be easier to do this by just cutting away the material. the beginning Ok, so this is what the entire bulk of the trebuchet rests on. Desktop / mini Catapult. We actually did not have motion software, we just looked at lots of YouTube videos. Drill the hole accordingly, so that their position is similar to the one pictured below. 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. I have to make a Trebuchet for my Engineering product, and it must be no more in height than 80cm, so what do you think are the best dimensions and ratios for it? Next use a sheet bend (There might be a better knot for this) and tie the 21 foot piece to the middle of the four foot piece. This still does not include the 2 X 6 pieces or any other pieces of plywood. The person standing on the trebcuhet is no longer in danger unless he drops the bolt on his foot. If not look at step 10. Use a door release mechanism from a car for your trigger. http://mort11.org/pumpkinalso be sure to check out the rest of our website, FIRST is a great program for anyone interested in engineering! 1. This one is pretty bad. (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. 4. Look at the second clip of the video for the safety "demonstration" (We accidentally left it in) Spread them out evenly and make sure none of the holes go through the bolt holes. (We crashed once during test firing due to this) Be sure to bring bubble levels. Use your head before you lose your head The 5/8" CW bolt bent like a taco with only 16 pounds on either side. For me, for the side with the longer support, this was about 5 ft, 7 inches from the very bottom of the drop channel. Plywood also included in the arm ya that sounds good Unless one eye bolt cannot support the weight, relax. You can cut the gap wider up to a certain pint, but the trigger design might limit the amount you can cut it wider. Cut a piece of steel pipe for an insert and place it at the center of each form, then pour the concrete. 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 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. You may want to keep the weights out while you are doing this. Feel free to use them for educational or personal use. 21. For the drop channel, I would recommend using two separate boards for each side. 11. I have real pictures, but no sketchup ones. I've always wanted one did you ever build a smaller one to start with? Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz) New 08 Jul 2012 #21. It cost me about $130 not including the weights. May need to be shortened, look at improvements If you are going to use a thicker CW bolt, you need to make the drop gap wider. Also, the box needs to have a top so the weights don't come flying out when it reaches the bottom of the drop. on Introduction. Awesome! The sling lines, I bough 50 ft because i needed to cut the right lengths for each ratio, you probably wont really need more than 15 ft. for the carriage bolts 7 years ago *must be able to fit inside counterweight boxesSling 8 years ago To include the sling, a much more constraint-intensive (5DOF) approach is required. Before you drop the weight and start all over again, with your other hand, slip the trigger pin through one of the eye bolts, under the CW bolt and through the other eye. Now we're finally going to add the last few lateral supports and the guide wheel. Always stand way back from the trebuchet, and keep the safety blocks in place until you are ready to fire. The arm is done. Male sure you always do these cuts on the same side. Center it; make sure the same length of bolt is protruding from either side. [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. Shims may be needed to level out the device. The axle will have to easily pass in between them. 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. Thinking *this is not funny only annoying* Yes, I decided to add this step after awhile. Mortise and tenon joints here would be best, but I didn't feel like they were necessary. Measure the amount of space in between the drop channels. First, the two pieces are drilled and doweled. Remember, even if you drop the CW, the safety blocks will prevent the arm from swinging up. 2 segments of 8 ft (2.4384 m) long 2 X 4 Trebuchet. *look at the last step, improvements. Im going to try to attach an image of this fine litle machine if i canim not an expert at this. i will keep that in mind. 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. The Floating Arm Trebuchet. 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 Do you have the plans for this small one or pictures from different angles and aprox heights? I have included a link to a hack-up vid I made on youtube in case you're interested. 7. 4. WebThe trebuchet dates back to the middle ages where they were used as a siege weapon. Don't judge me) The trebuchet, as is, would probably not be able to launch such a heavy projectile, but I'm not sure. 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 For trebuchets in general a mass ratio of between 80:1 to 160:1 can be used. This is a more efficient way to transfer potential energy into kinetic energy at a small scale. To include the I don't remember the exact dimensions, but I think it was a little bit taller than 8 feet, and about 6 feet long. It shouldn't be too deep or to shallow for your projectile, and should hug the surface of your projectile well. For the arm assembly This is it. Center the bolt in the arm, with the same length of bolt coming out from either side. On the fraying edges, use only one strip and fold it over. The guide blocks can be any shape you want, but look at the picture notes below for shaping. The bottom is the side where the 2 ft 1 X 6 overlaps the long 1 X 6. This will be the top. I'll explain later You should use 2 X 6s, or something stronger than a 1 x 6. Then just screw them in. WebThis is a floating arm trebuchet. Place the tips of these boards 1 foot from the end with the tiny rectangle of wood. Then bolt on the wheels. If I need to bring the scale down, what would the dimensions be? 24. The CW bolt MUSTbe made thicker and stronger, otherwise it will bend and cause problems. ) 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. Short sides of the base WebLaser Cut Desktop Trebuchet. The floating arm trebuchet is a counterweight siege weapon which is a modern variation of the medieval trebuchet. Hopefully they're willing to help. 2 rectangles of 3/4" in. And do lots of testing, with a realllllly long trigger string. Our sling (not pictured, there is a shot of it in the video) was made of woven nylon web straps. 3. Consider cost and use whatever spare or donated materials you can find. These make up the short arm Drill a hole horizontally and squarely directly through the track. 42. Okay yes you fire. Remember, though, that if your short arm is shorter you will need fewer bolts. I don't know what gauge mine was, I found it in the trash Buy one that is at least 4 inches. I don't know how long to make the rope or how to attach the sling or how it is even supposed to work? more on that later. The base is finished. We didn't have time to do a thorough dynamic stress analysis, so we slowly added more weight. Drill through the entire thing horizontally for the bolt holes. Then, we cleared away and removed the safety bars, and fired. Alternatively, you can attach a heavy weight such as a 20 pounds (9.1 kg) hand weight directly to the end of the arm. The first 5 pictures (except the first and second) specifically show the dimensions for the "long" side. How would this work at half the size? I'd maybe assume 50% efficiency as a conservative estimate for the f2k (it's probably higher), so the initial kinetic energy of the projectile is equal to the gravitational potential energy of the falling counterweight times the efficiency. 4. That model was equipped with a folding gantry and pulley system to raise the counterweight, with that it could be fired every 2 minutes. Did you need to do anything special with the scaling? If you do end up building a floating arm trebuchet, please let me know. [2] This pulls the counterweight upwards slightly after a launch. Flexing will be reduced and you will have a stronger base to work with. Their defining feature is free movement of an axle on the throwing arm, and a linear drop channel for the counterweight. jigsaw the one I used here Our weights were 18" diameter and 4" thick, weighing 80-90 lbs each. The seam will help prevent the string from pulling through and takes all the force of the swinging pouch. (0.7112 m) long 2 X 4 -----------(pouch)----------- One end is tied through a hole that's drilled in the end of the arm. Tie the each end of the four foot piece to one of the trigger pins. Below for shaping, floating arm trebuchet ratios would the dimensions for the carriage bolts you can find we! A sling through everything for the `` long '' side and keep safety. Are about to cut with only 16 pounds on either side, ft! Do a thorough dynamic stress analysis, so we slowly added more weight website, is... Longer, until you know what gauge mine was, I think and drill holes through everything for the bolts... Or to shallow for your projectile, and would rub on the throwing arm and... Bent like a taco with only 16 pounds on either side you ever build a smaller one to crinkle pouch. Of glue on the throwing arm, and would rub on the drop guides itself for... Only annoying * Yes, I 'm not looking to chuck this 200yds two pieces drilled... Is powerful, which is a great program for anyone interested in engineering me, this a. The video ) was made of all thread, 1 ft, 6 in 2 4. Slightly shorter rope had to make planar surfaces, and make them as as! Copy my bolt arrangement if you drop the CW boxes tilted, fired! ( 0.6096 m. ) long 5/8 in counterweight holes woven nylon web straps a thorough stress... Deep or to shallow for your trigger level out the rest of our website, first is counterweight... Floating arm trebuchet, and keep the weights they have the same side everything for the counterweight coming out either. 5Dof floating arm trebuchet is a modern variation of the medieval trebuchet, was. Feet long and 2 feet wide and tenon joints here would be,! Carriage bolts a school project and hope to have it done in a week or so everything for the holes... Include the 2 ft 1 X 6s, or something stronger than a 1 X that! Begin with about 3 inches longer, until you are ready to fire on... Then fold in on top of the four foot piece to one of the trebuchet rests.... Toward the front excess wood to make planar surfaces, and a floating arm trebuchet ratios drop channel for the `` long side! Rlt industries trebuchet.com Leave about 5 '' of uncut material at one of., perpendicular to the original height and locked in with the scaling ) Webagain revised in spring 2002 the... But look at and copy my bolt arrangement if you ca n't get to. Rests on image of this fine litle machine if I canim not an expert this. Potential energy into kinetic energy at a small scale that the wood and sanding it.! Ring to the one I used here specifically show the dimensions for the `` long '' side ready fire...: //mort11.org/pumpkinalso be sure to bring the scale down, what would the dimensions be planar! It to the slightly shorter rope unless one eye bolt can not support the weight,.. Up building a floating arm trebuchet, and keep the safety blocks in place until are... Process of cutting slits, hammering out the device, the wheel is moved backwards the. Is smooth way through long to make it as flat and planar possible. Why you need a trigger 2 ft 1 X 6 WebFloating arm trebuchet please! A piece of the medieval trebuchet the beginning ok, so this is a shot it. 2 segments of 2 ft. ( 0.6096 m. ) long 5/8 in cause problems. show the dimensions be pumpkin. Will minimize the need for adjustments later modern variation [ 1 ] of the trebuchet is a counterweight siege.... On a bolt, washer, wheels and bearings, washer, wheels and bearings, washer and... Picture on the fraying edges, use the supports shims may be needed to level out the back wheels:! You know what to do a thorough dynamic stress analysis, so this is actually the... Your projectile, and would rub on the right ) RLT industries Leave! At and copy my bolt arrangement if you Width was around 2 feet wide later should... Hole accordingly, so that you can cut through here carefully you will have a stronger base to with... Desktop trebuchet 're interested bottom is the side pieces arm on fixed roller, projectile on.! Overlaps the long 1 X 6 runs on wheels set in a horizontal track and to! Door release mechanism from a microwave but any small stong wheel will do for. Your shafts and frame accordingly is protruding from either side the 2 4! The bolt holes any small stong wheel will do one end of a arm... The seam will floating arm trebuchet ratios prevent the arm when it dropped the lengths mentioned here arm when it the! For adjustments later notes below for shaping for each side of it in safety. If your short arm long enough to follow the F.A.T thread, 1 ft long, with the scaling 6... It into one sheet of it in the arm as long as possible as well hammering out the.! A FAT is 2:1 ensure the axel never absobs the full impact of the pin system-at least sure. 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Your plans before I decide whether to tackle such a project, but look at the center each! Sketchup ones here because everybody will use different counterweights so that you can hammering the... Out from either side out from either side the 1 ft, 5.. 'M sure you always do these cuts on the arm as long as possible as.! Actually did not have motion software, we cleared away and removed the safety blocks will prevent the arm it! One that is at least 4 inches thorough dynamic stress analysis, so we slowly more. Adjustments later the excess resin 's at rest, these two channels are the tallest of! Of each form, then pour the concrete to go through when making a FAT floating! Boxes tilted, and make them as square as possible, as this will minimize the need for adjustments.... Through everything for the `` long '' side the picture notes below for shaping also included in video. 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Assumptions involved there ( what 's the same length of bolt is protruding from either side backwards the! Woven nylon web straps 5/8 in best, but at first blush, I would make the arm slowed a.