If you are going to use a thicker CW bolt, you need to make the drop gap wider. Luckily, It's also pretty simple to make. The original floating arm design originated in modern times, from professional and hobbyist engineers for recreational and educational use. Tilt the diagonal slowly over to the drop channel, keeping the bottom corner on the base and next to the bending brace. Reply But I'll try. 8. This kit is professionally engineered, designed and manufactured in the USA. (if you do it, let me know; I'll tell you how to make fireball projectiles), 7 years ago drill (The one I used here came in a kit here) with a varied drill bit set, for pilot holes, etc. Virtual Trebuchet is a free web based trebuchet simulator. Long sides of the base They flexed a lot and caused several problems when I was building the trebuchet. On the folds themselves, use one strip of tape per side with a slight bit of overlap and stick the two pieces together. (This is actually for the trigger) The sling releases when the loop on the end of the sling rope slides off of the pin. They are basically the same things as the 2 x 6 diagonals except they are 2 X 4 and they have more half-laps cut in them. This will take more weight off of the long arm, which should be as light as possible. Thanks! I have no idea if this is the most ideal design for this type of trebuchet. Otherwise, you might pull the trigger and one side of the CW will get stuck. You should have a " Y " shape rope with a trigger pin on each end. A note about the guide blocks: Reply This way, it's easy to angle the board to get angled shots. 3. So, if you want them to be the same height, you may need to change the angles or the lengths mentioned here. The axle bolt hole would be drilled in the short arm 1.5 feet from the end. NOW AND ONLY NOW take out the safety blocks. Now, cut very carefully and very straightly down the lines you made. it just over 24 inches tall I can provide more detailed dimensions, advice, and tips if you wish, just let me know. 2 segments of 2 ft. (0.6096 m.) long 5/8 in. I had to add them later. First, grab two of the 8 foot long pieces. 8 matching cut washers https://www.quora.com/What-is-the-ideal-ratio-for-trebuchets Drive 2 screws through the drop channels and into the supports. The second picture shows what it should look like after they are screwed in. They keep the side-to side motion of the tracks to a minimum. These will be the drop channels If it's too narrow at the top then the smooshing will happen as they fall closer to the bottom. Position yourself diagonally to the front of the trebuchet. For a traditional trebuchet, the optimum weight ratio is 133:1. on Introduction. You can cut the gap wider up to a certain pint, but the trigger design might limit the amount you can cut it wider. Also, get the most straight lumber available for the longer pieces on the frame. COMMENT RATE Finally, put a nut and washer on the outside bits of the bolt that protrude from the tracks. 1. cut off about 8 inches from the leg of the jeans. 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. The two marks should be 6/8" apart. 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. Next we have the drop channel supports. To cut the tracks, mark a 3/4" gap that is aligned with the drop channel gap and the support directly below. Punch two holes. Friction when the counterweight is dropping down to the glide strike can be reduced by using silicone grease or a thin film of plastic on the drop channel. Question So, again, cut off the ends of all the 1 ft, 5 in. Buy 15 2 X 4s to start off with, then buy more later. 24. The floating arm trebuchet is a counterweight siege weapon which is a modern variation of the medieval trebuchet. To launch such a heavy projectile will require much more weight than the approx. NEEDS TO BE MADE THICKER: LOOK AT IMPROVEMENTS The guide blocks can be any shape you want, but look at the picture notes below for shaping. Oh, and the arm itself. First of all you need two people Large scale designs require special trigger mechanisms that can hold the weight of the throwing arm. This may need to be changed I might include them later. for the carriage bolts at this point, we used a ratchet to tighten the eye bolt, until the chain was in tension and the weight bar no longer made contact with the safety bars. We did indeed build a small scale floating arm trebuchet very close to the specifications your physics assignment is calling forand it has demostrated ability to throw small "bouncy balls" from a vending machine 270 feet, and big bouncy balls (slightly bigger than a golf ball) over 180 feet. Have fun and be safe. This is way too cool. The person standing on the trebcuhet is no longer in danger unless he drops the bolt on his foot. The lines shown in the 9th picture show 2.5 feet. There are plenty of places you can go on the internet to look for better ideas. 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. The first picture shows what this looks like. Without one of them , the arm would simply fall into the ground. Your arm should look nice and smooth like the pics. look in improvements, may need to be changed The floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. We drilled holes in the upright beams perpendicular to the weight bar, directly below where it would hover when the trebuchet is ready to fire, and stuck a piece of 1" steel bar though on each side. The pinis crap. i am building a trebuchet for my physics class. Grab 3 of the 2.5 foot pieces. Taper the arm from a full 3" at the axle to 1" at the finger end of the arm (Fig. On average these machines could fling material of 350 pounds onto an enemy territory. nails will slide out of the wood, and will not keep the box together. (Diagonally). 50 ft. (15.34 m) of 3/16 (0.47625 cm) braided polyester cord Webconfigurations for the trebuchet: 1. I won't go into huge detail here because everybody will use different counterweights. thank you, Reply All scaled proportionally from the larger version (the tall vertical pieces are 130mm long, throwing arm 150mm). That's its fault. Okay, now I'm not kidding. Don't judge me) Does it take a small army to transport it? Just cut a length of 2 X 4 To fit in the spots shown in the pictures. Additionally, I would make the arm as long as possible as well. Use the top bolt for screwing in, and the bottom one for unscrewing. [4] The higher the drop channel, the more energy is released, but this puts more strain on the mechanism. Drill a 1/4 hole 20" from one end, in the middle of the board, as shown in Fig. That model was equipped with a folding gantry and pulley system to raise the counterweight, with that it could be fired every 2 minutes. -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. The straight track drop is an idea used in a FAT (Floating Arm Trebuchet), or in our Baby ASOK (Arm Slides Over Cam). 6. These should be fairly simple-they're just diagonal pieces. The hardest part, really, is getting the angles correct and then cutting them accura (2.54 cm.) Again, make sure a 5/8" bolt can easily fall through. i was hoping you could tell me what the release system was rated for and if you have any recommendations on where i can acquire a quick release, 8 years ago War Wolf was the largest trebuchet ever made and was rumored to send boulders of about 150 kilograms across a distance of over 200 meters. As long as it's a strong, flexible cloth pouch that is big enough to wrap around your projectile, It's fine. The knot should be on the inside of the pouch. While a regular trebuchet and floating arm trebuchet both drop a counterweight from only slightly above their pivot points, a FAKA trebuchet drops a counterweight from nearly 2 arm lengths above the ground, giving it more potential energy, thus allowing projectiles to be fired a greater distance. 7. (2.54 cm.) The most common of several trigger mechanisms is two eye bolts and a peg through both bolts. 7. We think that the downward throws were caused by these two heads. cut about 6 inches from the edge, along the 7 ft. arm. Trebuchets work by using a counterweight system turning the falling energy of the back end into a high speed launch of a heavy S Kei Sco Table Saw Sled Marble Machine Plan Drawing All The Way Down Viera Stick It Out Things That Bounce Element I will be launching this in a range 200yds and I'm looking to toss under that because I will be demonstrating my trebuchet about 50yds or so from a football field and I will be tossing the weight towards the field and at the other end is a parking lot. 3 ft. (0.9144 m.) long 5/8 in. Also, the diagonal track supports are different heights (As you can see in the sketchup model) because in the original plan, the two mitered side drop channel supports were not included. 2 segments of 3 ft. (0.9144 m) long 2 X 4 They would extend outward, just like the board chute. I used a projectile motion program I wrote using Matlab last year, and assumed a release angle of 45 and initial height of 15 ft. A mortise and tenon joint would have also probably worked. At least i think. Lastly, drill a hole through both the walls of each box at least two inches from the top edge for the counterweight bolt. lateral supports This film is made to demonstrate some easy steps to go through when making a FAT (Floating arm trebuchet). Use your head before you lose your head Awesome trebuchet! The first through fifth sketchup picture will show this. 7 years ago 3/8 X 4 eye bolt (Including bolts) Without the other, the tracks may not be aligned or the width of the drop channels might narrow or widen (Not staying even= bad) It was determined that the optimal arm length ratio was approximately 1:2, where the short 3 years ago. Finally, thread your sling lines through the hole on the outside of the seam to the back, and then through the back to the front. Hopefully everything has been built straight and solid. 2 X 4s at a 45 degree miter. 6 segments of 2 ft., 5 in. Do you have any instructions or tips perhaps? Drill through the entire thing horizontally for the bolt holes. 3000, Guillotine-Style Catapult Designed and made in the USA for better quality, better performance! WebAn important part of whipper performance is the beam ratio, the ratio of long arm to short arm. so i need to cut length of everything down to size. Thank you for your generous gift to the DIY community. Make sure the axle bolt is short enough to clear the frame easily. Drill the hole accordingly, so that their position is similar to the one pictured below. 9 years ago And, I'm not looking to chuck this 200yds. Have to build a Treb (much smaller scale), for physics assignment - any advice, for height restrictions of 60cm (just under 24inch) and area of base 900squared cm (just under 140 square inch) - to throw golf ball minimum 100 feet - done some research and most suggest floating arm mechanism would be better option? 16. It will be harder to split or break the wood. (0.635 cm) washers, matching carriage bolts The two bits at the open top of the cut channel..keeps the drop channel from "opening" A friend and I are making trebuchet that seems to be about the same size. Keep everything tight. *Basically you just want enough layers of tape around the rope holes so nothing rips, and so that the rope doesn't pull out of the holes. Our weights were 18" diameter and 4" thick, weighing 80-90 lbs each. 2 segments of 2 ft., 11 in. 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. Tie it so that it hangs about 12 inches (2.55.1 cm) from the top of the arm. Make a square line across the flat side of the board. Now, let's get started actually building and attaching them. MATERIALS LIST: -Lumber (4x4, 2x4, plywood) -Deck Screws (lots of them) -Carriage bolts, nuts, washers -all thread, 1/2", 1ft sections (for sling pins) -Harmonic Balancers ~7" dia (4X) -Steel Shafts, various diameters -Steel pipe, appropriate mating diameters to shafts -Bolts for bushings -Concrete (450+ lbs) and circular forms (OR just use gym weights) -Steel plates -Steel chain, 1900lb test, 3-4ft -Door latch mechanism from a car -Nylon rope (or other strong rope/cable) -Nylon webbing for sling -Axle grease -Welding equipment -Grinder -Drill press -Carpentry tools -Paint (optional). The floating arm trebuchet loses the range advantage over regular trebuchet at very large scales, because the difficulty in construction of the drop channel and axle increases with size. 20 yell heads up, countdown , just make sure everyone know you are firing. 3. You also will need to push them out slightly, so that the gap is 3/4" at least. 5. 22. still thinking. This ring will be what loops around the pin. Again, cutting these pieces shorter will narrow the track and cutting them longer will widen it. 4 years ago. Center it; make sure the same length of bolt is protruding from either side. Now, to attach it: Imagine the pouch itself. yes, it works extra lateral support Tie a figure 8 knot. This will prevent the counterweights from falling. Mark the line directly across the flat face of the track, perpendicular to the long edge. 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. This is the pin. The trigger will be added later. 4 segments of 1 ft., 5 in. To begin, enter the parameters of your trebuchet in I lined up the holes with the dowels and hammered home. A solid metal ring of any kind would work better. circular saw (The one I used here) OR miter saw AND table saw Mine should have been made of aluminum or tapered toward the end, but it worked fine in the end. I don't know how long to make the rope or how to attach the sling or how it is even supposed to work? It does not matter. I will be modeling my trebuchet after your and would like to know Can the trebuchet launch a 2-lb dumbell? Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. Now, I believe that the width between the bottom of the main track supports is somewhere around 1 ft, 1 inch. 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. so: This is the only part of the trebcuhet that can vary a lot. Tighten all the knots and make sure none will slip. When firing, make sure no-one is down range, near to, or directly behind your trebuchet. and if everyone wants the step I'll add it. leaning, tilting marking, etc. The Floating Arm Trebuchet. 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. Desktop / mini Catapult. 10 years ago If you look at the materials and the pictures of the arm, it probably won't be too hard for you to figure out how it goes together. The third clip in the video shows this problem well- the arm kind of rolled over and on top of the guide blocks because they were too high. 4. Again, this is not a critical dimension, something near that would work. Place the weights in the box and screw on the top. 3. The trebuchet, as is, would probably not be able to launch such a heavy projectile, but I'm not sure. This still does not include the 2 X 6 pieces or any other pieces of plywood. I would get more in case some of their heads strip 4. 11. It may have thrown some little thing off so just use your judgment about the angles. Put the ratio hole wherever it goes. 2 segments of 2 ft. (0.6096 m) long 2 X 4 The axle will have to easily pass in between them. Our team devised a problem statement: Design and construct a launching device to maximize the horizontal To reset the device, the counterweight must be raised back to the original height and locked in with the trigger mechanism. Remember the length really is only 1 ft 5 in. Bolt on the CW boxes. Then drive 3 through the base and into the bottom of the drop channel. 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. Change the lengths as you need to to keep the drop channels and tracks aligned. of the projectile, the height of the counterweight, and the sling and arm angles. Mortise and tenon joints here would be best, but I didn't feel like they were necessary. 2 hand weights, 8 lbs (3.63 kilos)* You also want to keep the track in a straight line, otherwise the wheels will fall off the edge. That is to say, you should make sure your drop towers reach the full length of the 80 meter height. Now, measure that same distance on the base. The weight bar was 1.5" diameter, AISI 4140 cold drawn (probably overkill) and the axles were 1.2" diameter, AISI 1020 CD. DRILL PILOT HOLES FOR EVERYTHING!!!!!! You need: 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. Simulated distance: 316.6 feet. these are the trigger pinsWheels, weights [5] Friction of the wheel on the arm axle against the glide track should be managed in a similar way. Reply Webtwice the ratio of the CW to projectile masses times the distance that the CW falls. For trebuchets in general a mass ratio of between 80:1 to 160:1 can be used. The first recorded use of traction trebuchets appeared in ancient China and were probably used by the Mohists ps-mohist are a scientific lead version of the chinese What is the floating arm Trebuchet, and how does it work? Two last things How much will this cost? WebThe Floating Arm Trebuchet: The floating arm trebuchet is a modern take on an ancient war machine. Make them small as possible, but make sure they can still guide the arm until its wheels hit the track. 7 years ago If it is, that will be solved later in the finishing touches step. (The counterweight bolt has to be strong enough, too. ) Remember that these adjust the front half of the tracks, the next bit adjusts the back. Socket wrench for your threaded rod Remember, smooth transitions. about 250 2.5 in. 3. 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. First, you need to know where you will screw in the bottom of the main track supports. Share it with us! A wide chisel would also work. The chain link on the opposite end should click into the door release easily. Essentially, beef up the arm assembly. I'll write more about this in the improvements step. Its 3.5 inch edge should also be 1/4" from the long edge of the 6 ft. long 1 x 6. MAKE SURE THE EYE OF THE TRIGGER PIN IS FACING THE FRONT OF THE TREBUCHET otherwise you will have to switch it. It is scaled using the data of skullmech;s trebuchet, but taller as we had no hieght restriction. 10 1/4 in. Do you have the plans for this small one or pictures from different angles and aprox heights? Best catapult ever (98 ft) Load more 3D Printer Info. 6. For each track support, you should use 3 of the 2.5 inch screws, screwing them from the bottom of the base and up into the supports. Then, measure 3/8" from either side of this mark. 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. The other end should be open. I'm sure this pouch design could be improved. Different jeans vary, so this next step might be different for you. (15.24 cm.) GoochesVFD said that there was some cracking around the base of the long 2 X 4 used as the drop channel. (6.35 cm.) *It would be better if the two previous 1 X 6 pieces were 2 X 6, I'll explain later. You need to lift the counterweight to the height of the supports so your friend can get them just underneath the CW bar. 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 next 3 specifically show the dimensions for the short side. 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. Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. 1 segment of 7 ft. long 2 X 4 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 do not want this side to come undone, so make sure it's tied tightly to the end of the arm however you can. 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 On the arm, drill a hole for an eye bolt, and use a washer on both ends. That was bad. Share it with us! As a starting point, cut these two Fairly simple trigger design. These make up the short arm so then the long arm would be 3.5 times that The first sketchup picture (Sorry only have real pictures of the finished thing) shows what it should look like when your done. Again, the lengths can be changed slightly, but you want at least 22 feet of length away from the trigger pins when you fire. It should be drilled all the way through the flatter 3.5 inch edge side. (1.27 cm) wood screws, phillips head drive, # 8 I would still recommend that you read through the list, and buy the lumber as you need it to avoid wasting wood. This is the hardest part of loading. 8 years ago 2. Put a generous amount of glue on the flatter side, the 3.5 inch side. http://mort11.org/pumpkinalso be sure to check out the rest of our website, FIRST is a great program for anyone interested in engineering! I've definitely seen some trebuchets in that size range throwing tennis balls, 6" steel shot, etc very far. A four foot piece and 21 foot piece. 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) jigsaw the one I used here (Safety blocks explained later) If you have a certain ratio in mind but you do not know the lengths, use this example: 6 1/4 in. 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