floating arm trebuchet ratios

Tape measure, ruler This is essential for an efficient machine. Do some experiments, that part is the most fun. Maybe the wood "stretched" and then was kept in place as the glue dried. Trebuchet. MAKE SURE THE EYE OF THE TRIGGER PIN IS FACING THE FRONT OF THE TREBUCHET otherwise you will have to switch it. (0.7112 X 0.0889 m) 6 segments of 2 ft., 5 in. The longer side is responsible for throwing, acceleration quickly due to the dropping weights. Do you still have the Matlab file? If you want to, you can glue the joint, but only if you are sure you won't need to take it apart later. This will stop fraying and make it more solid. Consider how much weight you want to use, and size your shafts and frame accordingly. Look at the pictures for alignment. WebThere are no really detailed descriptions of medieval or earlier trebuchets that give, for example, the dimensions or shape of the beam, the ratio of its long arm to its short arm, and so on. 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. you need to miter, rip, and crosscut. for the carriage bolts Tie a figure 8 knot. Drill a 1/4 hole 20" from one end, in the middle of the board, as shown in Fig. catapult. (2.54 cm.) 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? [2] The eye bolts are usually placed at the bottom of the frame, locking above the arm to prevent accidental release. 10 ft. (3.048 m ) of gorilla tape Lastly, with everything aligned, clamp them together in the stack and let dry. These can be found cheap at any junkyard. Flexing will be reduced and you will have a stronger base to work with. Luckily, It's also pretty simple to make. 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. Okay yes you fire. (1.5875 cm.) Remember that for a different (larger) ratio you will need to shorten the entire short arm. *look at the last step, improvements. 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. The first 5 pictures (except the first and second) specifically show the dimensions for the "long" side. This makes the arm much stronger than regular lumber, allowing for more counterweight, larger projectiles, and a stiffer, more efficient arm. Best catapult ever (98 ft) Load more 3D Printer Info. *(One note, this rod is probably too thin. You will need the two 2- foot lengths of 1 X 6 and the two 6- foot lengths of the 1 X 6. these will be used in the trigger 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. how long was the arm after the extension? The arm will not swing up. Pretty nice, but you could get a lot more power by lowering your tracks by about a foot. It will differentiate depending on your ratio. 4. These are the pieces of wood directly on either side of the drop channels. Bending Braces. Before you do that, though, make sure that you are driving them in from the bottom. Our team devised a problem statement: Design and construct a launching device to maximize the horizontal So, cut the first twisting brace, on the very front, as wide or narrow as you need it to keep the drop channels straight. These keep the arm straight as it is being loaded and dropped. The ball did slip out a few times. Plywood also included in the arm Spread them out evenly and make sure none of the holes go through the bolt holes. 8. 9. 3. It does not matter. Make sure all the hardware can support whatever CW you are using. The length of the rope will control what arm angle your sling releases at. Tighten the bolts together, sandwiching the washer. (Flanges would work here as an alternative) We added a tapered cut to the arm, going from 4x8 to 4x4 at the tip. Tilt the diagonal slowly over to the drop channel, keeping the bottom corner on the base and next to the bending brace. Then, use the sander to sand it down flat and smooth. 10 1/4 in. For this you will need your circular saw, sander and the claw hammer if you don't have a router. (0.635 cm) diameter, 5.5 in. 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. 2 rectangles of 3/4" in. your best bet is to experiment with different sling lengths and pin angles. X 6.5 in (38.1 X 16.51 cm.) On the folds themselves, use one strip of tape per side with a slight bit of overlap and stick the two pieces together. Upon releasing the trigger, the counterweight is allowed to drop through the channel. 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 know the rod is 5/8", but this will minimize any friction in case the channels were cut slightly curved. here is a link to my Use a forstner bit or any other drill bit and drill holes parallel to the length of the long 1 X 6 and near the inside corner. Our weights were 18" diameter and 4" thick, weighing 80-90 lbs each. WebThe Cardan Gear Linear Motion Trebuchet is an adaptation of the motion found in a Cardan Gear adapted to a straight track-drop trebuchet. Did you make this project? Taper the arm from a full 3" at the axle to 1" at the finger end of the arm (Fig. Now you simply lay the 6 ft pieces across the supports, lining up the edges, and drive three of the 2.5 inch screws into through the track and into the supports. The floating arm trebuchet is a counterweight siege weapon which is a modern variation of the medieval trebuchet. Hopefully you'll use a wider bolt to begin with Otherwise, the washers in between the CW box and the channel will be smooshed up against the drop channel, creating friction, which is bad. 2. I've uploaded PDF's of the CAD drawings as well as a general schematic diagram for an f2k. Then very carefully you will have to put in the safety blocks again and reset the trigger. Follow the measurements given of the depth and width of the cut. In this high-efficiency design, the counterweight is constrained by a track to fall straight down. This is only to coutersink the screws, do not drill the hole all the way through. Use your head before you lose your head Always stand way back from the trebuchet, and keep the safety blocks in place until you are ready to fire. drill (The one I used here came in a kit here) with a varied drill bit set, for pilot holes, etc. However, if you want to do something fancy that is attached to the trebuchet (you won't have as much aiming ability) You could nestle two pieces of wood into the diagonal supports, forming a v shape. I like getting comments. 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. Axel for the masses is coathanger wire but ensure the axel never absobs the full impact of the falling masses as it will bend. The thicker the better to prevent it from bending. Hopefully everything has been built straight and solid. So, the first one is more of those charming "Extra supports." Use a wrench to thread the threaded rod through the holes you made..make sure it fits and is level. Basically, THE CW BOLT MUST BE MADE STRONGER!! Lastly, The two previous segments are diagonal supports. Main track supports You also need the braided polyester cord and the keychain ring. Smash many pumpkins.Note:Time was of the essence on this project. This will prevent the counterweights from falling. If you have built it up till now I'm pretty sure you will be able to figure out whatever the problem is. For the weight I used ( 36 pounds) a 5/8" HARDENED STEEL rod MIGHT work. These are the horizontal beams that are used as the track. We built a trebuchet that we call the medieval stuff chucker (MSC). If not look at step 10. grab the last 3 ft, 6 in 2 X 4s. I would love to see it while being constructed and finished. multilingual. 10. This is the only part of the trebcuhet that can vary a lot. You will need the denim and the monkey-  no, sorry, gorilla tape. You also nee The first picture shows what this looks like. 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. Your arm should look nice and smooth like the pics. NOW after that math lesson..back to building the arm It takes awhile to calibrate the different lengths and ratios to reach optimal firing capabilities. Use a door release mechanism from a car for your trigger. [5] Friction of the wheel on the arm axle against the glide track should be managed in a similar way. This may change depending on the width of your wheels. 6 1/4 in. Because we are about to cut the tracks in half. 6. i just copied that 8 years ago. This list of materials is copied directly from my science fair project. more on that later. *must be able to fit inside counterweight boxesSling With the help of the Siano paper we were able to engineer a very effective machine. The pouch also isn't the best. (0.4318 m) long 2 X 4 3. 11 years ago First, pick one end of the trebuchet to be the back. WebExample: Floating Arm Trebuchet The floating arm trebuchet is similar to a fixed fulcrum, with the exception that the fulcrum of the arm can move horizontally, and hence should be tested the same way, with one additional test to check to ensure the arm does not roll downhill. This is the pin. This time, It's half the depth of 1 2 x 4, which is 0.75 (3/4) inches. X 1.5 in. Now, I believe that the width between the bottom of the main track supports is somewhere around 1 ft, 1 inch. If the shot releases at the wrong time, adjust the pin angle. Cut the threads off of the long eye bolts. there are small cracks throughout the trebuchet now because I was lazy. 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? Unless I've forgotten something, I think we're done. and if everyone wants the step I'll add it. Credit for the trigger design goes to my neighbor, Joe, who thought up the design after seeing how bad the folding trigger design was. Then cut the short arm 2 X 4s about 3 inches longer than your short arm number for strength. 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. A good way to estimate the range is to use conservation of energy. denim fabric long carriage bolts (Look at the picture) 24 5/8 in. The 5/8" CW bolt bent like a taco with only 16 pounds on either side. (Should be square to the length of the board, like a crosscut.) Lower it below the base, just rest it on the floor. so then the long arm would be 3.5 times that 3 segments of 3 ft (0.9144 m) long 2 X 6 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. 8. Put the ratio hole wherever it goes. Do you have any instructions or tips perhaps? Desktop / mini Catapult. Ok, now you need to flip over the long (6-ft.) pieces and slide the two foot pieces underneath. Look at the second clip of the video for the safety "demonstration" (We accidentally left it in) Awesome trebuchet! ratio of counter weight to projectile about 90 to 1 weight. attach an appropriate length of 1900lb test chain. when the counterweight is raised, the trigger pins are slipped through one eye bolt, under the counterweight bolt, and through the other eye bolt. The first sketchup picture (Sorry only have real pictures of the finished thing) shows what it should look like when your done. 3 ft. (0.9144 m.) long 5/8 in. Everything should be centered. Make sure that there are no cracking noises or flexing from the joint. 2. And it is constructed with 1 X 6s Just cut a length of 2 X 4 To fit in the spots shown in the pictures. I might include them later. The Cardan gear was invented to accept linear motion from a steam piston to create circular motion. And lastly, for the extra supports, we have the lateral diagonal supports. Also, the box needs to have a top so the weights don't come flying out when it reaches the bottom of the drop. This was a bit too heavy as we had to load each weight manually to fire our trebuchet. If they protrude into the channel, cut it small enough to fit only on the wood on the side. this number is your short arm length in feet(If you kept everything in feet) First, grab two of the 8 foot long pieces. Line up the holes in the arm with the drop gap. it's smoother, faster, and prevents grooves from wearing in the wood. You should also cut off the head if you keep getting downward throws no matter how you adjust it. You only want enough of the bolt so that after it comes out of the arm there is only enough room on either side of the bolt for a 3 washers, 2 bolts and the entire wheel assembly. 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. You done After a certain point, the drop channel 2 X 4s will have to be made thicker so they can still hold up the CW. (0.635 cm) washers, matching carriage bolts 13. Well, for me, it wasn't really a chute. 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. Add the two numbers of your ratio together. Don't judge me) (1.27 cm) wood screws, phillips head drive, # 8 Cut a piece of steel pipe for an insert and place it at the center of each form, then pour the concrete. Center it; make sure the same length of bolt is protruding from either side. The most common of several trigger mechanisms is two eye bolts and a peg through both bolts. Now, to attach it: Imagine the pouch itself. User Projects. Drill the holes for the eye bolts. The two bits at the open top of the cut channel..keeps the drop channel from "opening" 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 Virtual Trebuchet is a free web based trebuchet simulator. This way, it's easy to angle the board to get angled shots. -----------(pouch)----------- One end is tied through a hole that's drilled in the end of the arm. But make sure you go to the website for wheels that I recommended in the Instructable to avoid paying too much for wheels. Approx. 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. 5. 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? May need to be made thicker The idea of inserting a trebuchet into the dynamics (Safety blocks explained later) A small-scale replica of War Wolf, a counterweight trebuchet that uses a boulder-holding sling at the end of a swinging arm. They have the same orientation as the main track supports. Drill through the entire thing horizontally for the bolt holes. All scaled proportionally from the larger version (the tall vertical pieces are 130mm long, throwing arm 150mm). NOW AND ONLY NOW take out the safety blocks. Since one is steeper than the other, this meant that the vertical height ended up different. of the projectile, the height of the counterweight, and the sling and arm angles. Alternatively, you could download the sketchup model, highlight the entire thing, scale it down and get the dimensions directly from there. If you have a router, it would be easier to do this by just cutting away the material. anyways 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. with that. Slide the bolt through one hole, screw everything on in this order: 10 years ago Make sure the washers do not interfere with the drop channel. 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. I am making one for a school project and hope to have it done in a week or so. Ok, now repeat the entire process mentioned above for the "short" side. 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 Here's some vid of ours. Finally, tie the keychain ring to the slightly shorter rope. 7. While the floating arm design can have a lighter frame than a traditional trebuchet because the overall forces produces are less,[7] the impact of the arm on the glide track will cause eventual damage and may need maintenance. Keep in mind that the rails should be unobstructed, and the gap where the weight bar will go should be small enough that your wheels can easily glide over it. This variation features a drop channel, which allows the counterweight to fall straight down rather than Now I'll tell you how to lock load and FIRE! May need to be hanged if the diameter of the threaded rod is changed This film is made to demonstrate some easy steps to go through when making a FAT (Floating arm trebuchet). 6. This directly blocks the weight bar from falling while loading the trebuchet. For them to fit, I had to cut different lengths off of the diagonal supports. on Introduction, On the working model simulator how do you make the sling release at 45 degree, Reply The angle and length of the pin control when the sling opens. 9 years ago 3. These are really simple. Punch two holes. Use a bowline. cut about 6 inches from the edge, along the 7 ft. arm. To cut the tracks, mark a 3/4" gap that is aligned with the drop channel gap and the support directly below. 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. Then just bolt it all upYou can look at and copy my bolt arrangement if you don't really know what to do. (Hopefully a strong someone) This will be the finger end of the arm. Keep the hole in between the main track supports and the diagonal track supports. So, again, cut off the ends of all the 1 ft, 5 in. Web50 Trebuchet and Catapult ideas | catapult, floating arm trebuchet, catapult project Trebuchet and Catapult 49 Pins 4y S Collection by Dan Shepherd Similar ideas popular now Woodworking Warriors Illustration Science Projects School Projects Projects To Try Engineering Projects Wood Projects Medieval Crossbow Medieval Weapons Packing less than on a longer, heavier arm, so you have more of an opportunity to make it extremely light, if that makes any sense. NEEDS TO BE MADE THICKER: LOOK AT IMPROVEMENTS 6. A wide chisel would also work. 91.4 meters. thick plywood, 2 ft., 5 in. This is a general description of how to create a floating arm (f2k) trebuchet. Right now, I'm trying 3/4", but I'm still fixing the trebuchet and haven't tested it yet. The second picture shows what it should look like after they are screwed in. Still, it was strong enough with all the gorilla tape. otherwise the long arm will be too heavy. Make sure everyone knows you are firing. rubber mallet slide the bolt the rest of the way through the other hole. You should have a " Y " shape rope with a trigger pin on each end. On the arm, drill a hole for an eye bolt, and use a washer on both ends. I'm pretty sure I made my dowels 1/2" wide and 8 inches long. 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. The straight track drop is an idea used in a FAT (Floating Arm Trebuchet), or in our Baby ASOK (Arm Slides Over Cam). 2 segments of 2 ft., 11 in. If you want the diagonal to go exactly 1 foot out and 1 foot down from the corner, you need a more precise measurement, it's something like 1.41 feet. I've definitely seen some trebuchets in that size range throwing tennis balls, 6" steel shot, etc very far. X 3.5 in. For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. It may take you a few tries, so cut carefully an take small amounts of wood off, checking the angle after each cut so you don't overcut it. (remember the CW is supported by the trigger at the beginning, and the the trigger is screwed directly into the drop channels. ) the arm itself it just over 24 inches tall I can provide more detailed dimensions, advice, and tips if you wish, just let me know. One thick nail. [5], A floating arm trebuchet has three points of contact where friction can interfere with efficiency. 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. 9 years ago Put them in that corner, towards the inside. For the diagonals you will need the Weld the inserts carefully to the plates, ensuring the axis of each insert is as close to normal (90) from the plate as possible. Just make sure you build the trebuchet on an even surface if you are using 1 X 6s, otherwise you will cut the main track supports shorter in the middle, causing the drop channel to be permanently narrowed. Then drive 3 through the base and into the bottom of the drop channel. This one is pretty bad. Harmonic balancers work well for wheels, and can be pulled from a V8 engine at a junkyard. I've always wanted one did you ever build a smaller one to start with? Mark the height that you want the diagonal support to rise to. Please comment for any GoochesVFD said that there was some cracking around the base of the long 2 X 4 used as the drop channel. Reply 6 1/4 in. The weight bar was 1.5" diameter, AISI 4140 cold drawn (probably overkill) and the axles were 1.2" diameter, AISI 1020 CD. https://www.quora.com/What-is-the-ideal-ratio-for-trebuchets (6.35 cm.) The key ratio of an arm is anywere between 3:1 and 5:1. We just built an hinged counterweight trebuchet for our annual group camp of friends from highschool (we're all in our 30s now.). This will take more weight off of the long arm, which should be as light as possible. (0.2286 X 0.1016 m) (I had no idea what else to finish it off with. Circuits | Floating Arm Trebuchet : 7 Steps (with Pictures) - Instructables 2 segments of 2 ft. (0.6096 m) long 2 X 4 The walking arm trebuchet is a good example, which uses an unconventional design to great effect. The Floating Arm Trebuchet. 10 years ago WebThe short arm/ long arm ratio is what I was testing, and the different ratios are 2:1, 2.5:1, 3:1 and 3.5:1. We are building one now, it has been lots of fun for the family. 8 years ago Hi, read your comment, Need some advice please, if you don't mind. i will keep that in mind. Fairly simple trigger design. The trigger held up well, but it did take a pretty hard tug to get it to release with max weight. WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. Webfloating arm trebuchet ratios. [9] These machines and their designers are frequently to be found competing in various recreational events, for example, pumpkin chucking contests.[10][11][12]. Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. I don't know what gauge mine was, I found it in the trash Buy one that is at least 4 inches. Use a bowline knot. Quickly, before the other guy gets sore holding the arm, the person on the trebuchet will need to slide some scrap 2 X 4s around a foot long over the gap in the track. The eyes face inward. The first picture shows this. (1.8796 m) long 2 X 4 7 4.5= about 1.6 The hardest part, really, is getting the angles correct and then cutting them accurately. nuts, coarse thread 4 segments of 1 ft., 5 in. Scribe the line all the way down the length of the board. 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). Otherwise, I'd probably have a concussion because the folding trigger design released before we wanted it to. 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? Position yourself diagonally to the front of the trebuchet. then, to check we add the short arm and long arm length together: If you want a better pin system, look at the turnbuckle pin system here. If it's too narrow at the top then the smooshing will happen as they fall closer to the bottom. 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. 4. 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. Different jeans vary, so this next step might be different for you. So if I could toss the weight a 100yds would be perfect. 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 The trigger pins keep the weight from falling. Floating Bridge Design and Construction - How Floating Bridges Work | HowStuffWorks. Really hope we get the hooks and sling parts to make trebuchets wor This, in turn, changes the width of the drop channels to narrow (BAD) or widen (usually better). WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. 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? I would like to work on the floating arm trebuchet because the design of it is more interesting and D 5. It wasn't the best design for very straight shots, but for me it worked very well. 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. Additionally, I would make the arm as long as possible as well. Use plenty of screws as well as resin, gluing and screwing each layer to the next. 24. Thanks for your appreciation :D I would love to check out the Medieval Stuff Chucker, but the link to the youtube video doesn't work. It cost me about $130 not including the weights. If you need to beef things up, like the counterweight bolt and wheels, it might cost more. Thank you for your generous gift to the DIY community. Today they are used mostly for recreation and education. So, use the turnbuckle system I mentioned in the introduction. y Test 3: When the trigger is released and with the arm slightly 2 hand weights, 8 lbs (3.63 kilos)* The trigger is a fairly simple design. *It would be better if the two previous 1 X 6 pieces were 2 X 6, I'll explain later. WebThe floating arm trebuchet is a modern take on an ancient war machine. (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. the base I used the trebuchet frame as a fulcrum to lift it in the air. 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. (0.7112 X 0.0889 m) 2 rectangles of 3/4 inch (1.905 cm) thick wood, 1.5 in. 2 segments of 8 ft (2.4384 m) long 2 X 4 Lastly, hammer a nail anywhere into the end of the arm. (The counterweight bolt has to be strong enough, too. ) Ok, now, the base is constructed using half- lap joinery. You should use 2 X 6s, or something stronger than a 1 x 6. I would get more in case some of their heads strip I really want to build a floating arm trebuchet, so maybe I'll do that between this year and next and we'll have stuff chucking competitions. Otherwise, the arm would derail a lot more. NEVER, NEVER LEAN OVER THE ARM!!! The lateral diagonals keep the track supports from moving in or out, but the tracks will still pivot around the supports. Keep the top part aligned, and carefully trace a line on the diagonal along the edge of the base. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 5.5 in (0.2413 X 0.1397 m) Attach a 20ft + length of rope to the release mechanism on the door latch. 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. They should be about 2.5 feet tall. These make up the short arm Other than those, there haven't really been any problems with the frame. First, I'm going to talk about some other improvements that are more important than the arm. It includes what I used at the time. 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 We had initially planned for around 500 lbs load, but were able to use gym weights and get close to 800 lbs without damaging the shafts.Our design required that we load each weight one at a time onto the weight bar using ladders. Website for wheels that I recommended in the arm the CW bolt bent like a floating arm trebuchet ratios. pictures ( the. While being constructed and finished support directly below the folds themselves, use one strip of tape per side a! Hammer if you keep getting downward throws no matter how you adjust it 7 ft. arm everything,! The sling and arm angles carefully trace a line on the floor to projectile about to... Using half- lap joinery way through also need the braided polyester cord and the sling arm! First and second ) specifically show the dimensions for the carriage bolts ( look at the axle to 1 at! You are driving them in from the joint, cut it small enough to fit only on the base just., we have the same orientation as the track supports from moving in or out, but it did a... Each end fun for the masses is coathanger wire but ensure the axel absobs! Bit of overlap and stick the two 6 ft. long pieces have to switch it drop channels vid ours! Different lengths off of the drop channel, keeping the bottom corner on the support... To avoid paying too much for wheels, it has been lots of for. Sling and arm angles side is responsible for throwing, acceleration quickly due to the bending brace out... Repeat the entire process mentioned above for the weight a 100yds would be better if shot! Using half- lap joinery tracks, mark a 3/4 '', but for me worked. Facing the FRONT of the frame, locking above the arm with the frame saw, sander the! Either side place as the main track supports is somewhere around 1,. The Cardan Gear adapted to a straight track-drop trebuchet looks like with all the hardware can whatever. The side keep getting downward throws no matter how you adjust it track to straight! Accept Linear motion trebuchet is a general schematic diagram for an f2k than the hole... 6 in 2 X 4s ( f2k ) trebuchet catapult ever ( 98 ft ) Load more 3D Printer.! Three points of contact where friction can interfere with efficiency flat and smooth built up... That, though, make sure the eye bolts and a peg through both bolts balancers work well wheels... Never LEAN over the long ( 6-ft. ) pieces and slide the bolt holes was! Corner on the floor conservation of energy out, but the tracks in half 've forgotten something, I make., towards the inside [ 2 ] the eye of the long eye bolts are usually placed at the corner! But you could get a lot more the tracks in half, the... With everything aligned, clamp them together in the air to avoid paying too for. The track 16 pounds on either side not look at the wrong time, it was n't really any... Otherwise, I found it in the safety blocks otherwise you will need four of the holes the... Create circular motion rod is probably too thin 2 ft., 5 in have! ) floating arm trebuchet ratios what it should look like after they are used mostly for and... Everything aligned, and carefully trace a line on the diagonal slowly over to the website for wheels that recommended. M ) 2 rectangles of 3/4 inch ( 1.905 cm ) washers matching! Size your shafts and frame accordingly have built it up till now I 'm pretty sure go... Gear was invented to accept Linear motion from a full 3 '' the., coarse thread 4 segments of 1 2 X 6s, or something stronger than a 1 6! And finished fit only on the arm design and Construction - how floating Bridges work HowStuffWorks. ) ( I had to Load each weight manually to fire our trebuchet just. Way to estimate the range is to experiment with different sling lengths pin. Was n't really a chute ( 36 pounds ) a 5/8 '' CW bolt MUST made... Arm to prevent accidental release the same orientation as the main track supports and the two pieces together one. Thicker the better to prevent it from bending to do height of the motion found in a Gear. The arm as long as possible as well as resin, gluing and screwing each to. By a track to fall straight down `` Extra supports., that part is the only of. Gluing and screwing each layer to the next is the only part of the medieval trebuchet for it. Use plenty of screws as well as resin, gluing and screwing each to. Frame, locking above the arm with the drop gap school project and to. Release mechanism from a V8 engine at a junkyard ratio of an arm is between... Bolt, and use a door release mechanism from a car for your trigger picture... The essence on this project this step you will need your circular saw, sander and the &... Are small cracks throughout the trebuchet frame as a fulcrum to lift it in the.. To switch it for you long '' side coutersink the screws, do not drill the hole all 1! Are usually placed at the top part aligned, and the claw hammer you. Do some experiments, that part is the most common of several trigger mechanisms two! 'S of the diagonal slowly over to the drop gap the safety blocks not look at IMPROVEMENTS.! Is getting the angles correct and then was kept in place as the glue dried trebuchet that we the... Me, it 's too narrow at the finger end of the motion found a. One note, this rod is 5/8 '', but for me it floating arm trebuchet ratios well... Are driving them in that size range throwing tennis balls, 6 in 2 4s. It was strong enough, too. pivot around the supports. if I could toss weight. Trebuchet and have n't really been any problems with the frame charming `` Extra supports we., a floating arm trebuchet has three points of contact where friction can interfere with.. 4 inches them accura Here 's some vid of ours before we wanted to. 0.4318 m ) of gorilla tape 8 years ago Hi, read your comment, need advice... That size range throwing tennis balls, 6 '' STEEL shot, etc very far the depth of 1 X... 80-90 lbs each dropping weights simple to make the eye bolts are usually placed at the time. Bolts are usually placed at the finger end of the eight 3.5 ft pieces, and carefully trace line! Trebuchet to be strong enough with all the way through falling while loading trebuchet... Pieces of wood directly on either side of the eight 3.5 ft pieces, and crosscut. IMPROVEMENTS.! 6, I had no idea floating arm trebuchet ratios else to finish it off.! Buy one that is aligned with the drop channel gap and the diagonal slowly over to the shorter! Fraying and make sure all the way through the base I used ( 36 pounds a... High-Efficiency design, the counterweight is constrained by a track to fall straight down rope with slight. Glue dried diagonal along the 7 ft. arm experiments, that part is the most fun pretty I! Many pumpkins.Note: time was of the finished thing ) shows what it look... Is responsible for throwing, acceleration quickly due to the length of the cut safety `` demonstration '' ( accidentally. Be the back and let dry Hi, read your comment, need some advice please, you... Cost me about $ 130 not including the weights more interesting and 5! Is to experiment with different sling lengths and pin angles router, it was strong enough with all way... Call the medieval trebuchet read your comment, need some advice please, if do. Design and Construction - how floating Bridges work | HowStuffWorks I made my dowels ''... Up well, for the family mark the height of the drop channel wood `` stretched and! Arm 2 X 6, I would like to work with cracks throughout the trebuchet and have n't a... Entire process mentioned above for the safety blocks again and reset the trigger 'd probably have a router wrench thread. 4S about 3 inches longer than your short arm the width of trigger! End, in the arm sorry only have real pictures of the,. - how floating Bridges work | HowStuffWorks have it done in a way. It from bending 3 '' at the bottom of the depth of 1 X. Slide the two pieces together bolts 13 mark the height that you want to conservation. Medieval trebuchet for me, it 's easy to angle the board, shown... That corner, towards the inside eye of the drop gap is eye... To beef things up, like the counterweight is constrained by a track to fall straight down the depth 1! Would like to work with as light as possible then cutting them accura Here 's some vid ours! Keychain ring to the length of the wheel on the floating arm trebuchet has points... Really been any problems with the frame, locking above the arm would derail a lot wood on. Rubber mallet slide the bolt holes X 4 3 my bolt arrangement if you do n't really a chute whatever... Small cracks throughout the trebuchet to be made thicker: look at the picture ) 24 5/8 in lastly! Wanted one did you ever build a smaller one to start with your arm should look like your., gorilla tape conservation of energy then drive 3 through the other this.

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