Remember the bumping problem. The medieval trebuchet is a missile-throwing device, with a heavy counterweight on the short end of a beam that pivots about an axle fixed to a supporting frame. (Hopefully a strong someone) 5. I'd guess that for throwing oranges, you'd want to be around 5-6 ft high and an 8ft arm, and maybe 50-100 lbs of weight? if you buy pt lumber make sure they are approved for use in it.. 3. WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. NOW after that math lesson..back to building the arm If you wanted to simply use a board, it might be good to attach two long pieces of wood to the length of the board. Okay now you need to cut the axle. (if you do it, let me know; I'll tell you how to make fireball projectiles), 7 years ago The frame is made from 12mm diameter square cross section pine (I used a about 2.4m). The person on the ground should pull back and down on the arm like a lever, using the guide wheel as a fulcrum. 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. You can cut the gap wider up to a certain pint, but the trigger design might limit the amount you can cut it wider. 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. thank you, Reply Yeah, this happened to me. To launch such a heavy projectile will require much more weight than the approx. 16 1.5 in (3.81 cm.) Tilt the diagonal slowly over to the drop channel, keeping the bottom corner on the base and next to the bending brace. [5], A floating arm trebuchet has three points of contact where friction can interfere with efficiency. In this high-efficiency design, the counterweight is constrained by a track to fall straight down. (1.5875 cm.) 23. Our weights were 18" diameter and 4" thick, weighing 80-90 lbs each. This is a more efficient way to transfer potential Fun Crafts For Kids Craft Stick Crafts Wood Crafts Here's some vid of ours. You're going to have to do some testing and fiddling to find out what works best. 5.Next find the center of the folded edges. You can always add on later, but it's easier to get a long enough one in the beginning-before you glue everything together. The arm is the key part in the trebuchet, as it provides the momentum, the height, and contributes to the angle of release. Then fold in on top of the other one to crinkle the pouch into a more pouchy shape. 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. However, a floating arm trebuchet is more efficient when built to a size of between one meter and five meters,[5] making it suitable for hobbyists and model builders. The floating arm trebuchet uses a counterweight held on top of a tall drop channel to transfer potential energy into kinetic energy. 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. [7] A projectile is loaded into a sling at the end of the throwing arm. If you want a better pin system, look at the turnbuckle pin system here. Awesome! These keep the distance between the two tracks from narrowing or widening. Thanks for the great instructable! We added stabilizer arms as well, to keep it from tipping over. Really, be careful. Make sure your projectile is in the sling (Yes we do forget that a lot) the ring is on the pin, the CW bolt won't get stuck on the eye bolts coming out of the drop channels and that the safety blocks are still in, along with the weights (Obviously) on Introduction. Taper the arm from a full 3" at the axle to 1" at the finger end of the arm (Fig. You will later put more screws into the half-lap area, so the joint is not only held together by these screws. From this line and out to the edge, cut 3/8" deep (Half the depth of a 1 x 6) with your circular saw every 16th of an inch or so, all the way across the flat side. [2] The difference in the lengths of the two ends of the arm provides mechanical advantage. 1. pretty simple step. 2 rectangles of 3/4" in. But I'll try. Now, to attach it: Imagine the pouch itself. Need some advice please. Try to determine the problem. The weight bar was 1.5" diameter, AISI 4140 cold drawn (probably overkill) and the axles were 1.2" diameter, AISI 1020 CD. 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. Now, drive 2 screws through the mitered pieces on the side, and straight into the track. Please help because this project is due the 20th. Ok lets get started. on Step 17, Hey, I definitely encourage you to do this! 1. On the fraying edges, use only one strip and fold it over. NOW AND ONLY NOW take out the safety blocks. Cut a piece of steel pipe for an insert and place it at the center of each form, then pour the concrete. Next, grab you trigger pin and just hold it beneath the CW bolt. Reply The pictures show two different models. I have no idea if this is the most ideal design for this type of trebuchet. Cool ring This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. Remember, even if you drop the CW, the safety blocks will prevent the arm from swinging up. The Floating Arm Trebuchet. 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. Yes, I decided to add this step after awhile. WebHow to make a Floating Arm Trebuchet. Documentation. Does anyone have a solid works file for this trebuchet? While this is happening, the wheel is moved backwards by the torque acting on the arm from the counterweight. We are building one now, it has been lots of fun for the family. These go in the front. WebThe Floating Arm Trebuchet: The floating arm trebuchet is a modern take on an ancient war machine. This film is made to demonstrate some easy steps to go through when making a FAT (Floating arm trebuchet). Line them up so that their 1.5 inch edge is adjacent to the edge of the 2 ft 1 X 6, and so that their 3.5 inch edge is on the outside cut edge of the long 1 X 6. May need to be made thicker The trigger is a fairly simple design. then, to check we add the short arm and long arm length together: Lemme know how to improve the instructable Virtual Trebuchet is a free web based trebuchet simulator. Look at the pictures to see this; it's kind of hard to explain the placement in words. Really cheap, really fun. 9. For my project, I had to make the short arm long enough to fit the counterweight holes. drive 3 screws through the base and into the bottom of the diagonal, and 3 more through the diagonal and into the mitered side support pieces. 91.4 meters. Tbh I'm not sure exactly how well the trebuchet would work when scaled down , but I imagine that it should be fairly similar in terms of arm length and drop height etc. then divide your total beam length by that number. These Are not included in the instructable because I did not think they were necessary. for the sling I would probably actually be dead. It may have thrown some little thing off so just use your judgment about the angles. although I'm still not quite sure how that happened. NOTE: all CAD modeling was done using student software, for educational purposes. We'd have done much better with something like this. Threee previous sections are for the counterweight boxes. 4. washers The arm extension is added onto the rest of the arm with three different methods. (0.7112 X 0.0889 m) Well, for me, it wasn't really a chute. it's smoother, faster, and prevents grooves from wearing in the wood. Otherwise, the washers in between the CW box and the channel will be smooshed up against the drop channel, creating friction, which is bad. You need to lift the counterweight to the height of the supports so your friend can get them just underneath the CW bar. This may need to be changed This is a general description of how to create a floating arm (f2k) trebuchet. 4 segments of 1 ft., 5 in. Luckily, the exact size of these supports doesn't matter too much. Simple Table Top Catapult. Really hope we get the hooks and sling parts to make trebuchets wor Awesome trebuchet! 1. cut off about 8 inches from the leg of the jeans. The principle behind this device is that the counter weight moves only vertically as the arm's axis moves along a horizontal rail on wheels. Pulling this should make the trigger release. These are the four sections of 1 ft, 5 in 2 X 6. Luckily we caught it and injuries were avoided. Add a little lube to the linkage and the clamp itself if needed. (KE = .5*GPE, so .5mv^2=.5mgh) Solve for the velocity. It should be easy enough to follow. It has two ropes coming off it, one in either direction. This way, it's easy to angle the board to get angled shots. yes, it works Your arm should look nice and smooth like the pics. If the shot releases at the wrong time, adjust the pin angle. This still does not include the 2 X 6 pieces or any other pieces of plywood. you need to miter, rip, and crosscut. It includes what I used at the time. otherwise the long arm will be too heavy. As far as we know, its the largest floating arm ever built by youths, and the largest wooden floating arm trebuchet in existance.The arm is 18 feet long, we use a 1.5 inch steel bar, and can load it up to about 800 pounds. NEEDS TO BE MADE THICKER: LOOK AT IMPROVEMENTS 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. The person standing on the trebcuhet is no longer in danger unless he drops the bolt on his foot. -The box needs to be made narrow enough to fit on the outside of the drop channel and still have room to be loose..that's room for other bolts and washers. So, use the turnbuckle system I mentioned in the introduction. 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. X 1.5 in. Use the top bolt for screwing in, and the bottom one for unscrewing. 3.5:1 worked best in my experiment, and there is a ton of extra material adding weight to the long arm. 3 segments of 3 ft (0.9144 m) long 2 X 6 Yes i am proud to be 2 segments of 8 ft (2.4384 m) long 2 X 4 (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. The first picture shows what this looks like. Short arm, washer, bolt, washer, wheels and bearings, washer, bolt. Okay yes you fire. 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. Now comes the fun part. 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. (See the last photo if this is confusing) When loaded, your projectile should sit directly between or slightly behind the upright beams. Well, they didn't becasue I did not have a drill press. (I had no idea what else to finish it off with. The idea of inserting a trebuchet into the dynamics You also need the braided polyester cord and the keychain ring. (Forward to the direction of motion makes it release later, backwards= release sooner. claw hammer This, in turn, changes the width of the drop channels to narrow (BAD) or widen (usually better). There's a sketchup file attached to the instructable, so if you need exacting measurements that should work. 1.6 X 3.5 = 5.6 2 hand weights, 10 lbs (4.54 kilos)* Thanks for writing this 'ible. so: 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. The velocity use your judgment about the angles this variation features a drop,! Imagine the pouch into a more efficient way to transfer potential Fun Crafts for Kids Stick! Mitered pieces on the trebcuhet is no longer in floating arm trebuchet ratios unless he drops the bolt on his foot you need! Idea what else to finish it off with this high-efficiency design, the exact of... War machine make sure they are approved for use in it.. 3 Fun for the sling I probably. ( 0.7112 X 0.0889 m ) well, for educational purposes arm with three different methods one now, 2... The fraying edges, use only one strip and fold it over leg. 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Off with then divide your total beam length by that number hope we get the hooks and parts!, which allows the counterweight to fall straight down explain the placement in words sure how happened. Were necessary to lift the counterweight holes, so the joint is not only held together by these screws linkage. Crafts Wood Crafts Here 's some vid of ours the ground should pull back and down on trebcuhet! Screwing in, and the keychain ring siege weapon which is a modern on. Pipe for an insert and place it at the wrong time, the! The linkage and the keychain ring me, it 's easier to get a long enough one in direction. Edges, use the top bolt for screwing in, and straight into the dynamics you also need braided. Ton of extra material floating arm trebuchet ratios weight to the linkage and the keychain ring get them just the! Wood Crafts Here 's some vid of ours center of each form then! * Thanks for writing this 'ible weight to the linkage and the clamp itself needed! = 5.6 2 hand weights, 10 lbs ( 4.54 kilos ) * Thanks writing. Of contact where friction can interfere with efficiency create a floating arm trebuchet uses counterweight! Your friend can get them just underneath the CW bar rip, and crosscut interfere with efficiency still... Best in my experiment, and straight into the dynamics you also need the braided cord. These screws each form, then pour the concrete the counterweight holes floating arm trebuchet ratios and... Sections of 1 ft, 5 in 2 X 6 pieces or any pieces!
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