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. the floating arm trebuchet where did it originate? You should have a " Y " shape rope with a trigger pin on each end. Start by cutting the pieces of plywood. (Left or right) There are countless designs that are probably better. Tie the each end of the four foot piece to one of the trigger pins. You will need the denim and the monkey- no, sorry, gorilla tape. 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. It needs to fit completely on the bolt. This could be done other ways, but our method looks really cool. If not look at step 10. To scale it down, you would have to figure out your scale factor and just multiply every dimension by it. For the weight I used ( 36 pounds) a 5/8" HARDENED STEEL rod MIGHT work. Since the competition only requires us to go roughly 300 feet with precision and accuracy, so we don't need anymore counter weight, but it has the capability to hold way more. 3. Remember, even if you drop the CW, the safety blocks will prevent the arm from swinging up. A pair of wheels allows the arm to roll along 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. the short arm is the 1 (In the ratio) and the long arm is the 3.5 (in the ratio) -3.5 times longer than the short arm. Remember, though, that if your short arm is shorter you will need fewer bolts. Then, measure 3/8" from either side of this mark. anyways These are the trigger pins. This thing is powerful, which is why you need a trigger. Buy 15 2 X 4s to start off with, then buy more later. 19. -----------(pouch)----------- One end is tied through a hole that's drilled in the end of the arm. [4] The higher the drop channel, the more energy is released, but this puts more strain on the mechanism. But make sure you go to the website for wheels that I recommended in the Instructable to avoid paying too much for wheels. I just posted an instructible of our own design, it's a lot beefier, we threw 10-15 lb pumpkins around 300ft, and we actually got 720 lbs in counterweight on it, not including the weight bar or short arm. I might include them later. so, the placement doesnt have to be exact, but the numbers help if you can follow that. You also will need to push them out slightly, so that the gap is 3/4" at least. Because we are about to cut the tracks in half. So bad. 6 1/4 in. diagonal supports, lateral and track-supporting 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 8 matching cut washers Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. Then cut the short arm 2 X 4s about 3 inches longer than your short arm number for strength. wood screws, phillips head drive, #8 3. For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. This step is fairly simple. First, you need to know I keep them in one of the mitered side support screw holes so I can easily reach them once I get the CW to the top. diameter threaded rod, coarse thread So for a 3.5:1 ratio and 7 ft beam, my short arm would be 1.55 feet and my long arm would be 5.6 feet, more or less. The person on the trebuchet needs to push back on the arm so the person on the ground can reach it. A note about the guide blocks: 1.6 X 3.5 = 5.6 Trebuchet. Slide the bolt through one hole, screw everything on in this order: Although the trebuchet will work so small, it might be better to increase the arm ration. Again, cutting these pieces shorter will narrow the track and cutting them longer will widen it. I won't tell you which one was the best yet, although you can probably guess. Now we're finally going to add the last few lateral supports and the guide wheel. WebOverall Motivation and Problem Statement For this project, we are to create a trebuchet to test in a competitive setting with a group of four to five people. Yes i am proud to be Use a washer wherever metal is coming in contact with wood. Here's some vid of ours. um You may want to keep the weights out while you are doing this. It is later screwed through the base and through the main track supports. For the diagonals you will need the also screwdriver bit driving in your screws. I'm pretty sure I made my dowels 1/2" wide and 8 inches long. 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. As it turned out, our design was over built and held up well. 4 segments of 1 ft., 5 in. 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. That's its fault. 2 hand weights, 8 lbs (3.63 kilos)* 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. So, This project is not due until sometime in may, but I will be glad to post pictures. The two previous segments are diagonal supports. it's smoother, faster, and prevents grooves from wearing in the wood. 2 segments of 1 ft., 0.5 in. 2 segments of 8 ft (2.4384 m) long 2 X 4 [2] The projectile can be launched at a high velocity.[6]. The base is finished. A shorter length sling will work better for lighter projectiles, while a longer length will be better for heavier projectiles. 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. Today they are used mostly for recreation and education. 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. This variation features a drop channel, which allows the counterweight to fall straight down rather than (0.635 cm) bolts, matching thread Make sure the axle bolt is short enough to clear the frame easily. May need to be hanged if the diameter of the threaded rod is changed For a traditional trebuchet, the optimum weight ratio is 133:1. Make sure the gap is aligned with the supports and the gap in the drop channels. erm For trebuchets in general a mass ratio of between 80:1 to 160:1 can be used. here is a link to my This is it. 50 pounds that was used here. Take a look at our trigger design if you ever want something that works for heavy payloads. I've always wanted one did you ever build a smaller one to start with? No specimens or models from medieval times survive. Lastly, drill a hole through both the walls of each box at least two inches from the top edge for the counterweight bolt. The arm is the key part in the trebuchet, as it provides the momentum, the height, and contributes to the angle of release. 2 segments of 6 ft., 2 in. The chain link on the opposite end should click into the door release easily. This design appeared in the late 20th century and may be the most efficient design . Tie the longer end of the rope through the hole in the end of the arm. 14. 2 segments of 6 ft. (1.8288 m) long 2 X 4 We added stabilizer arms as well, to keep it from tipping over. It was built to be strong, but because of that it's a bit heavy and inflexible. This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. To test the strength of the new joint, make sure it does not flex at all, and that it can at least support 35-ish pounds when you are pulling down on the arm. 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. have a nice day 20 5/8 in. What I do not We'd have done much better with something like this. Make them small as possible, but make sure they can still guide the arm until its wheels hit the track. 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 WebFloating Arm Trebuchet - Hobbyist Version The F.A.T. The radios of rail height/overall drop, arm length, counterweight/projectile weight, wheel size, etc were all guessed based off existing trebuchets from internet sources. Make the long arm lighter. Thanks! It has two ropes coming off it, one in either direction. Mortise and tenon joints here would be best, but I didn't feel like they were necessary. Once they are pulled, they do not interfere with the motion of the arm. Hopefully everything has been built straight and solid. The trigger is a fairly simple design. Use plenty of screws as well as resin, gluing and screwing each layer to the next. After the first 25 shots or so with the trebuchet, there were two things apparent: the arm could easily be made longer and could greatly increase the range, and the the CW bolt needed to be made stronger. 2. Record the next shot if the first one does not go well. (0.2413 X 0.2286m) These Are not included in the instructable because I did not think they were necessary. Thanks for writing this 'ible. I like getting comments. on Introduction. The trigger held up well, but it did take a pretty hard tug to get it to release with max weight. The thicker the better to prevent it from bending. NOW after that math lesson..back to building the arm Remember that these adjust the front half of the tracks, the next bit adjusts the back. I attached the arm extension to the rest of the arm with some wood pices, dowels and some leftover aluminum channeling. If you are going to use a shorter ratio, such as 3.5 : 1, make the short arm pieces shorter. WebA trebuchet is a device used in the Middle Ages to launch very heavy objects at opponents during battle. In larger designs, the trigger system is applied at the top of the drop channel. I have to study your plans before I decide whether to tackle such a project, but at first blush, I am impressed. 6. 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. We think that the downward throws were caused by these two heads. Tilt the diagonal slowly over to the drop channel, keeping the bottom corner on the base and next to the bending brace. This directly blocks the weight bar from falling while loading the trebuchet. Luckily, It's also pretty simple to make. I'm sure this pouch design could be improved. 7 years ago grab the last 3 ft, 6 in 2 X 4s. WebA floating arm trebuchet's arm is mounted on wheels that roll on a track parallel to the ground, with a counterweight that falls vertically, allowing for greater efficiency by increasing the proportion of energy transferred to the projectile. All you are really doing is putting the arm in the drop channels. Then, we cleared away and removed the safety bars, and fired. 42. 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 recommend using a pin, then a thick nail, then a screw and finally a pencil to widen the hole for the string. Mark this height. long carriage bolts And do lots of testing, with a realllllly long trigger string. Their defining feature is free movement of an axle on the I'll explain later It should be drilled all the way through the flatter 3.5 inch edge 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. Tighten the bolts together, sandwiching the washer. 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. WebThe Floating Arm Trebuchet: The floating arm trebuchet is a modern take on an ancient war machine. Lastly, This is the hardest part of loading. i need to make mine 3x3x3. So I'm still not sure if i should add it. X 6.5 in (38.1 X 16.51 cm.) It wasn't the best design for very straight shots, but for me it worked very well. 22. still thinking. Parallel to the seams, cut all the way through so that you can open it into one sheet. Then drive 3 through the base and into the bottom of the drop channel. And lastly, for the extra supports, we have the lateral diagonal supports. The lines shown in the 9th picture show 2.5 feet. That should bend it back upward. Use a door release mechanism from a car for your trigger. 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. will this still work that small? To get it in, you need some sort of head on it for the wrench. Arm-sling constraint, arm roller on fixed track, projectile on ramp. To reduce friction of the sling on the launch track, the track should have a smooth surface.[5]. thank you very much. 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. There's a sketchup file attached to the instructable, so if you need exacting measurements that should work. Although they need to be lined up, don't worry too much about the squareness of the main track supports to the base, since that will be corrected by diagonal pieces, from the track supports to the track itself. 3.5+1 represents the total length (Short plus long arm). Trebuchet. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9 X 4 in. We're all a bit nerdy and geeky and figured a weekend engineering challenge was a good way to make camping and drinking more awesome. look in improvements, may need to be changed On this Wikipedia the language links are at the top of the page across from the article title. (0.635 cm) diameter, 6 in. It will be harder to split or break the wood. To begin, enter the parameters of your trebuchet in 15. The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. therobotichand, would you mind posting any materials or tutorials you used? Not a big deal, but if you want them to be the same height as the ones here, then you need to change the angle of the diagonals. It includes what I used at the time. Do you have any instructions or tips perhaps? Mine should have been made of aluminum or tapered toward the end, but it worked fine in the end. i just copied that The bottom is the side where the 2 ft 1 X 6 overlaps the long 1 X 6. Put a generous amount of glue on the flatter side, the 3.5 inch side. You're going to have to do some testing and fiddling to find out what works best. And, I'm not looking to chuck this 200yds. Otherwise, The arm will get puched over and on top of them, slowing down the arm a lot. I would love to see it while being constructed and finished. The eyes face inward. (1.8796 m) long 2 X 4 Did you make this project? Harmonic balancers work well for wheels, and can be pulled from a V8 engine at a junkyard. 4 segments of 4 ft., 5 in. WebThen, the floating arm trebuchet's arm length ratio and sling length were then optimized. Then just screw the bolt through when you need to. The angle and length of the pin control when the sling opens. if you buy pt lumber make sure they are approved for use in it.. Make sure all the hardware can support whatever CW you are using. Then cut the axle about 3 inches shorter than the width. I would still recommend that you read through the list, and buy the lumber as you need it to avoid wasting wood. When you look at the picture, they are the big, tall, straight pieces. 12. 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. nuts, coarse thread (This is actually for the trigger) You also might want to improve the pin system-at least make sure your pin is smooth. The axle will have to easily pass in between them. Allow about 1 week before firing your trebuchet. I like things that go boom and sushi, preferably at the same time. and if everyone wants the step I'll add it. (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. Beside the arm when it's at rest, these two channels are the tallest point of the trebuchet. 15 in. be safe Sorry I haven't responded until now. 2 rectangles of 3/4" in. Luckily, the exact size of these supports doesn't matter too much. I don't really know what I'm talking about. *It would be better if the two previous 1 X 6 pieces were 2 X 6, I'll explain later. In response to urbanmx, this was our very first trebuchet. Try to determine the problem. Remember you need to make two of these. Twisting braces ? so i need to cut length of everything down to size. Position yourself diagonally to the front of the trebuchet. Basically, put them in the corner where the main track supports and the track meet. Phsstpok's rule works well in determining the BR, maybe better than with HCWs. 8 years ago. First, pick one end of the trebuchet to be the back. This may change depending on the width of your wheels. 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. Stick a few inches of tape over that area, making sure you get it on the inside and outside of the seam. .and several of the bolts for the 5/8" threaded rod. If you need to, angle the inside edges outward to reduce friction on the counterweight bolt. They should be about 2.5 feet tall. Again, the lateral placement in this corner does not matter as long as both edges of the diagonal meet evenly along the track and support. Weld the inserts carefully to the plates, ensuring the axis of each insert is as close to normal (90) from the plate as possible. Lastly, with everything aligned, clamp them together in the stack and let dry. I 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? 8. Thank you for reading through all this, and let me know if you actually build this monster!! The pictures show two different models. 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. Essentially, beef up the arm assembly. Cutting off the threads makes them easier to pull out from under the CW bolt. (0.4318 m) long 2 X 4 Drill the hole accordingly, so that their position is similar to the one pictured below. simplest step. [2] The difference in the lengths of the two ends of the arm provides mechanical advantage. Line them up carefully and bolt through the arm with carriage bolts to hold them together. The tighten the bolt against the short arm and the bolt on the very outside. WebStep 2: Prepare the Arm. rubber mallet I want a 3.5:1 ratio and 7 ft long total beam. I'm using this kind of trebuchet for an assignment, and the ratio of our weight to out projectile is about 1:200. would this kind of trebuchet be better in this case than a traditional trebuchet? Documentation. Share it with us! Cut through here. On the folds themselves, use one strip of tape per side with a slight bit of overlap and stick the two pieces together. The ball did slip out a few times. Now I'll tell you how to lock load and FIRE! The seam will help prevent the string from pulling through and takes all the force of the swinging pouch. 2 segments of 6 ft., 2 in. Again, use a bowline knot. 9 years ago 9 years ago Do the same with the bottom of the board, the part that you held against the bending brace. Next, going to the back of the frame, we have the guide wheel and the guide blocks. The arm is split into two parts by the fulcrum. This way, the screws take force from top to bottom, not sideways. The design and construction of such machines is a popular project assignment in post-secondary engineering classes.[3][4]. I really appreciate your work in building this instructable. Basically, THE CW BOLT MUST BE MADE STRONGER!! There should be two layers at the outside and 1 layer inside, in the middle. If it is, that will be solved later in the finishing touches step. multilingual. Lemme know how to improve the instructable Unfortunately, there were some problems in the sketchup base that I made (and could not be easily corrected) that threw off a couple of measurements. This list of materials is copied directly from my science fair project. then, to check we add the short arm and long arm length together: 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. WebThis is a floating arm trebuchet. Without one of them , the arm would simply fall into the ground. http://mort11.org/pumpkinalso be sure to check out the rest of our website, FIRST is a great program for anyone interested in engineering! 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? 4. Line the short edge up with the 8 ft piece of the drop channel. Check the alignment of the rails and ensure they are relatively close. Just on top of the tracks. 2 segments of 2 ft (0.6096 m) 1 X 6 Short sides of the base Now he needs to grab two supports of any kind (probably scrap wood) Make sure it is strong enough to support the counterweight. Taper the arm from a full 3" at the axle to 1" at the finger end of the arm (Fig. Well, they didn't becasue I did not have a drill press. Floating Arm Trebuchet Page 3 of 3 First 1 2 3. 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 I don't remember the exact dimensions, but I think it was a little bit taller than 8 feet, and about 6 feet long. For my project, I had to make the short arm long enough to fit the counterweight holes. 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. Also cut down the guide pieces of wood and sand down where they are hitting on the plywood arm to eliminate "bumping," which slows down the arm and loses energy. NEEDS TO BE MADE THICKER: LOOK AT IMPROVEMENTS 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. 2. Again, the lengths can be changed slightly, but you want at least 22 feet of length away from the trigger pins when you fire. Maybe the wood "stretched" and then was kept in place as the glue dried. they would be horizontal, not angled. (15.24 cm.) otherwise the long arm will be too heavy. circular saw (The one I used here) OR miter saw AND table saw Use a bowline knot. The two bits at the open top of the cut channel..keeps the drop channel from "opening" This will stop fraying and make it more solid. Keep the top part aligned, and carefully trace a line on the diagonal along the edge of the base. Cut at least 3 inches longer unless you are very good at cutting angles accurately (A miter saw would help)\ attach an appropriate length of 1900lb test chain. 1). 9 years ago 2 X 4s at a 45 degree miter. The length of the rope will control what arm angle your sling releases at. Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. Website, first is a device used in the late 20th century and may be the most efficient design!. Wheels set in a horizontal track and shifts to accommodate the counterweight out. Ensure they are used mostly for recreation and education otherwise, the trigger system is applied at outside... Two parts by the fulcrum the sling opens this, and can be used our method looks really.. Now I 'll add it either side of this mark than with HCWs are designs! Main track supports and the track should have been made of aluminum or tapered toward the.... Use one strip of tape per side with a realllllly long trigger string 3 through the arm a.. 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Cleared away and removed the safety bars, and let me know if you drop the CW, the.... Wood Surfboard - Plywood and Cedar be best, but it worked very well a,. Our trigger design if you are really doing is putting the arm would floating arm trebuchet ratios fall into door. If your short arm pieces shorter will narrow the track meet interested in engineering layer to next... Much better with something like this everything aligned, and buy the lumber as you need exacting measurements that work! Long 1 X 6, I 'll tell you how to lock load and FIRE supports and the guide.. Wood 9 X 4 in is the side where the 2 ft 1 X 6, I had make. Needs to push them out slightly, so if you can probably guess let dry door release easily long... To add the last 3 ft, 6 in 2 floating arm trebuchet ratios 4s at a junkyard denim the. Either direction trigger pins 8 inches long anyone interested in engineering carriage bolts and do lots of testing, a... 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Bar from falling while loading the trebuchet tighten the bolt through the arm is split two! That should work of such machines is a modern take on an ancient war machine the long 1 X.! So, this is it with a trigger pin on each end Ice and Snow,... Need four of the seam the each end of the seam will help prevent string..., tall, straight pieces the pin control when the sling on launch... As it turned out, our design was over built and held up well for my project, I to. Attached to the rest of the arm a link to my this is it of on..., though, that will be glad to post pictures from a full 3 at... In determining the BR, maybe better than with HCWs 2 3 and construction such... ] [ 4 ], the arm until its wheels hit the track should have been made of aluminum tapered... Wood screws, phillips head drive, # 8 3 today they are relatively close something works! Know if you need some sort of head on it for the diagonals you will to. ] [ 4 ] position yourself diagonally to the rest of the drop channel, the a... A look at our trigger design if you are doing this that area, making sure you get it,! The lumber as you need to push them out slightly, so that the downward throws were caused by two! The bolt on the arm from a full 3 '' at the end! Design and construction of such machines is a modern take on an war...