Once everything is square, true, straight aligned or whatever you feel like saying, We can put this beast together. Licensed under CC BY 3.0, via Wikimedia I'm nearly done with the trebuchet but I'm having trouble understanding the sling. To launch such a heavy projectile will require much more weight than the approx. 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. It includes what I used at the time. Tighten all the knots and make sure none will slip. Have fun and be safe. 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. (0.4318 m) long 2 X 4 While this is happening, the wheel is moved backwards by the torque acting on the arm from the counterweight. Otherwise, the counterweights would just stop like the safety makes it do (Second clip in the video in the first step) A thin steel cable might work better.Axles and Shafts: We used small segments of steel pipe and drilled holes in them to make bushings. Drill a hole somewhere near the end of the armit doesn't matter, but it should be at least 3/4" from any edge. http://youtu.be/MS9OepeTELc, Reply When firing, make sure no-one is down range, near to, or directly behind your trebuchet. I would get more in case some of their heads strip 1.6 X 3.5 = 5.6 Approx 25 ft. (7.62 m)1/2 braided nylon rope Floating Arm Trebuchet Page 3 of 3 First 1 2 3. The arm is done. 2 segments of 2 ft. (0.6096 m.) long 5/8 in. although I'm still not quite sure how that happened. Just find a pair of old jeans May need to be made thicker Posts : 9,606. Simply miter off each edge at a 45 degree angle, so that the piece is the shape of a trapezoid. (1.5875 cm.) i am building a trebuchet for my physics class. OK onto step 1 With the help of the Siano paper we were able to engineer a very effective machine. Put a generous amount of glue on the flatter side, the 3.5 inch side. 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) (0.635 cm) diameter, 6 in. 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. Trebuchet 3: An Improved Floating Arm Trebuchet. Make the arm from the 1/2" x 3" x 36" pine board. [4] The higher the drop channel, the more energy is released, but this puts more strain on the mechanism. 4.5 common tools these are the trigger pins The axle will have to easily pass in between them. 8 matching cut washers WebThe floating arm trebuchet is a modern take on an ancient war machine. I forget what you are supposed to do next 9. Use a washer wherever metal is coming in contact with wood. It may have thrown some little thing off so just use your judgment about the angles. NEVER, NEVER LEAN OVER THE ARM!!! Really cheap, really fun. Tighten the bolt as much as you can. (0.635 cm) washers, matching carriage bolts Make sure that the washer in between the CW box and the drop channel is not caught on the bolts protruding from the eye bolts (Trigger pin holder.. things) Make sure it will be able to fall freely, But do not remove the safety yet. Drive 2 screws through the drop channels and into the supports. Now, cut very carefully and very straightly down the lines you made. I like getting comments. This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. Build the frame in two identical halves (left and right) and then attach each half to the frame. 20 yell heads up, countdown , just make sure everyone know you are firing. Lastly, cut through the plywood rectangle so the wheel does not bump over the edge of the plywood as the arm falls. for the carriage bolts the next 3 specifically show the dimensions for the short side. He can back away. Steam Community: Medieval Engineers. Raise the CW to the top and hold it there with your thigh (raise your leg to support it) and one hand. look out for flying cats Ideally, the arm should be vertical or slightly forward when the sling releases. WebStep 2: Prepare the Arm. Follow the measurements given of the depth and width of the cut. 7 years ago SECOND PROBLEM The first picture shows what this looks like. 1. cut off about 8 inches from the leg of the jeans. Punch two holes. I like the adjustable arm ratio. I want a 3.5:1 ratio and 7 ft long total beam. The first sketchup picture (Sorry only have real pictures of the finished thing) shows what it should look like when your done. 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. If this happens, use it on a hill or place two very thin pieces of scrap wood under the base, directly under the drop channels. NOTE: all CAD modeling was done using student software, for educational purposes. drill (The one I used here came in a kit here) with a varied drill bit set, for pilot holes, etc. 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. 8 .5 in. Cut through here. 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. The chain was then loosened again, the weights removed, and the arm cocked and locked with the safety bars again, and the cycle repeats.We chose to paint our trebuchet and stencil our school logo onto it, but this is just for looks.IMPORTANT: Safety is crucial when firing trebuchets. I speak Spanish and English, along with English and Spanish. The angles shown in the pictures are based off of the sketchup model, but they seem to be correct. Thanks! Could be built in probably a few weekends. (6.35 cm.) (0.7112 X 0.0889 m) The picture shows just 4 pounds of counterwieght, we added up to 10 pounds for maximum throws. Otherwise, the arm would derail a lot more. Have someone stand on the front half of the trebuchet. I've definitely seen some trebuchets in that size range throwing tennis balls, 6" steel shot, etc very far. catapult. WebHow to make a Floating Arm Trebuchet. Buy 15 2 X 4s to start off with, then buy more later. Short arm, washer, bolt, washer, wheels and bearings, washer, bolt. it just over 24 inches tall I can provide more detailed dimensions, advice, and tips if you wish, just let me know. It should be drilled all the way through the flatter 3.5 inch edge side. I did not have a drill bit long enough to go through all of the 2 x 4s of the short arm, so I had to drill individual holes in each individual 2 X 4 and hoped that they lined up. The lines shown in the 9th picture show 2.5 feet. If it is, that will be solved later in the finishing touches step. I'd look around on YouTube and compare different sizes of trebuchets. The part of the war machine that means business. Whatever you decide you want to launch with your trebuchet, your counterweight should be from 100 to 133 times the weight of your projectile. The longer side is responsible for throwing, acceleration quickly due to the dropping weights. This will be the finger end of the arm. (Safety blocks explained later) 3/8 X 4 eye bolt (Including bolts) Webconfigurations for the trebuchet: 1. The ridges would sometimes catch on the heads and sometimes not. The floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. I have no idea if this is the most ideal design for this type of trebuchet. 2 rectangles of 3/4 inch (1.905 cm) thick wood, 1.5 in. (0.7112 m) long 2 X 4 Remember you need to make two of these. 2 screws for each mitered channel support. I won't go into huge detail here because everybody will use different counterweights. WebThe 5DOF Floating Arm Trebuchet This is the floating arm trebuchet with a sling. Ok the longer support will go on the side where the track is longer, the side that the drop channel is farther away from. 10 years ago Cut these two twisting braces at around 1 ft 2 inches because the length of these will affect the width between the tops of the two drop channels. So, you need to drill the holes four inches deep into both the arm and the extension. I've made the pouch and strung one side through but from then on I'm lost. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 9 in. for the threaded rod I'm pretty sure I made my dowels 1/2" wide and 8 inches long. long carriage bolts I would like to work on the floating arm trebuchet because the design of it is more interesting and D (Order from inside to outside.) Did you make this project? It's a little bit tricky to get the angles perfect. This directly blocks the weight bar from falling while loading the trebuchet. This design appeared in the late 20th century and may be the most efficient design . Again, cutting these pieces shorter will narrow the track and cutting them longer will widen it. This new and improved 21st century version of the trebuchet uses a modern understanding of physics and engineering principles for incredible power and range! 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. It would also bend out of position because of the force of the swinging projectile. This might change depending on your weights setup. (remember the CW is supported by the trigger at the beginning, and the the trigger is screwed directly into the drop channels. ) Do you have any instructions or tips perhaps? You will need the denim and the monkey- no, sorry, gorilla tape. (1.5875 cm.) Upon releasing the trigger, the counterweight is allowed to drop through the channel. Next we have the drop channel supports. wood screws, phillips head drive, #8 less than on a longer, heavier arm, so you have more of an opportunity to make it extremely light, if that makes any sense. 2. 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. If it's too narrow at the top then the smooshing will happen as they fall closer to the bottom. You can always add on later, but it's easier to get a long enough one in the beginning-before you glue everything together. Use three screws in every place that the diagonal touches the track or support. (The counterweight bolt has to be strong enough, too. ) This one is pretty bad. Then just hammer the dowels all the way into the holes. 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. The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. A traditional trebuchet, which is simple to engineer, consists of an arm resting off-centre on an axle with a hinged counterweight at the short end of the arm. 1). It worked fine for me, though. 2 1/2 X 10 eye bolts (Left or right) Grab the trigger pins. The weight bar was 1.5" diameter, AISI 4140 cold drawn (probably overkill) and the axles were 1.2" diameter, AISI 1020 CD. 7 4.5= about 1.6 (I saw a car roof get crushed by a pumpkin flying backwards)Use a long trigger rope and keep yourself at a safe distance.Have fun. Make matching steel plates and drill holes into them for bolts and for both the counterweight bar and the axle, allowing room for steel pipe inserts. also screwdriver bit driving in your screws. 50 pounds that was used here. If you could find a simulator that would be great, but I never could. I would still recommend doing one, though. on Step 15, This is stellar. I have to study your plans before I decide whether to tackle such a project, but at first blush, I am impressed. Maybe the wood "stretched" and then was kept in place as the glue dried. Lastly, with everything aligned, clamp them together in the stack and let dry. Actual distance: 300 feet. If you are going to use a shorter ratio, such as 3.5 : 1, make the short arm pieces shorter. 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. Miter off one end of each at a 30 degree angle (with respect to the length of the board) This angle just makes it look cooler. Diagonal Track supports. First, obviously, just lay the arm in between the drop channels (Just the middle of the treb) (1.8796 m) long 2 X 4 WebThe Cardan Gear Linear Motion Trebuchet is an adaptation of the motion found in a Cardan Gear adapted to a straight track-drop trebuchet. Basically, lift the weight into the air using the arm as a lever and the seam in the arm close to the fulcrum. For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. The person on the ground should pull back and down on the arm like a lever, using the guide wheel as a fulcrum. WebVirtualTrebuchet is a web based trebuchet simulator that will allow you to quickly evaluate different trebuchet configurations. on Introduction, hey I'm a physics student trying to replicate your design. (Diagonally). Threee previous sections are for the counterweight boxes. cut about 6 inches from the edge, along the 7 ft. arm. Heavier projectile= earlier, lighter projectile = later. ) On the folds themselves, use one strip of tape per side with a slight bit of overlap and stick the two pieces together. I simply layed a fairly long board over the diagonal supports in the back, extending out a bit to give support to the sling until it was lifted up into the air. Just in case you didn't know It will prevent frame strikes, jams and other problems later on. [3] If you You also need the braided polyester cord and the keychain ring. Simulated distance: 316.6 feet. y Test 3: When the trigger is released and with the arm slightly Reply The Floating Arm Trebuchet The trebuchet is a medieval gravity powered engine of siege warfare designed to hurl a projectile, such as a heavy stone or a diseased animal, at a distant target such as castles. it's smoother, faster, and prevents grooves from wearing in the wood. I see you mentioned you built 2. They should be the same length apart as the width of the sling and its projectile. To get it in, you need some sort of head on it for the wrench. jigsaw the one I used here Take a look at our trigger design if you ever want something that works for heavy payloads. 9 years ago -Make sure it is strong enough to take the force of your falling counterweight. Our starter model was 1/6 scale, it threw a bouncy ball 270 feet with 10 pounds of counterweight. Did you need to do anything special with the scaling? http://mort11.org/pumpkinalso be sure to check out the rest of our website, FIRST is a great program for anyone interested in engineering! For this you will need your circular saw, sander and the claw hammer if you don't have a router. Do some experiments, that part is the most fun. Again, this is not a critical dimension, something near that would work. Circuits | Floating Arm Trebuchet : 7 Steps (with Pictures) - Instructables The long carriage bolts Lastly, drill a hole through both the walls of each box at least two inches from the top edge for the counterweight bolt. Make sure that there are no cracking noises or flexing from the joint. This is the only part of the trebcuhet that can vary a lot. 7 years ago That model was equipped with a folding gantry and pulley system to raise the counterweight, with that it could be fired every 2 minutes. 3. on Step 15. Ok, now you need to flip over the long (6-ft.) pieces and slide the two foot pieces underneath. 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. Floating arm trebuchet (dimes and pennies) Desktop Trebuchet. This way, it's easy to angle the board to get angled shots. Bending Braces. Does it take a small army to transport it? The 3/8" eye bolts go at the top of the drop channels. Because we are about to cut the tracks in half. Use a wrench or hopefully a driver of some sort to drive the CW bolt all the way throughone drop channel, through the arm and out the other drop channel. 9 years ago Leave about 5" of uncut material at one end. Here's some vid of ours. There are countless designs that are probably better. WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. Parallel to the seams, cut all the way through so that you can open it into one sheet. This metal loop goes around the pin, and as the centrifugal force increases as the arm swings, the ring slides off the pin to allow the pouch to open. A wide chisel would also work. Try to figure out where to put the 3/8" eye bolts so that you can raise the CW bolt all the way to the top, But make sure there is enough room for the trigger pin to go through and under easily. *(One note, this rod is probably too thin. [7] A projectile is loaded into a sling at the end of the throwing arm. 4. So now we're going to add some extra supports that will prevent the 2 ft 1 X 6 from bending, Lateral support and extra track support. 1. Bending 5. Did you make this project? A pair of wheels allows the arm to roll along -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. To cut the half- lap, refer to step 1. Even though IT'S VERY DANGEROUS IF YOU DO IT INCORRECTLY!!) Cut at least 3 inches longer unless you are very good at cutting angles accurately (A miter saw would help)\ simplest step. They have cutouts on them so that they can be screwed directly onto the base with their 2 ft. long edge flush with the outside 2 ft. edge of the short 1 X 6. So, if you want them to be the same height, you may need to change the angles or the lengths mentioned here. This, in turn, changes the width of the drop channels to narrow (BAD) or widen (usually better). 4. Whenever you feel like it, slip in the other trigger pin, with the eye toward the front. The axle bolt hole would be drilled in the short arm 1.5 feet from the end. This would, however, change the lengths of the diagonal supports. I had to add them later. The floating arm trebuchet is a counterweight siege weapon which is a modern variation of the medieval trebuchet. These can be found cheap at any junkyard. 15 in. These keep the distance between the two tracks from narrowing or widening. A regular trebuchet is a better realistic war machine. by 2 in (0.381 X 0.0508 m) This time, It's half the depth of 1 2 x 4, which is 0.75 (3/4) inches. First, pick one end of the trebuchet to be the back. [5], The dropping of the counterweight forces the arm to swing to one side of the glide track and quickly jerk in the opposite direction to launch a projectile. 1. Also, 1 inch thick wood would would be stronger.Hardware 2 rectangles of 3/4" in. Tighten the bolts together, sandwiching the washer. You should have 21 feet left. (third picture on the right) RLT industries trebuchet.com I made my own (although on a slightly smaller scale. [2] The difference in the lengths of the two ends of the arm provides mechanical advantage. 2 1/2 X 10 eye bolts It was an old rusty double- headed nail. I would love to see it while being constructed and finished. But make sure you go to the website for wheels that I recommended in the Instructable to avoid paying too much for wheels. on Introduction. 10 ft. (3.048 m ) of gorilla tape A mortise and tenon joint would have also probably worked. None seem to affect it structurally, but we'll see. The second picture shows what it should look like after they are screwed in. Then, measure 3/8" from either side of this mark. Webfloating arm trebuchet ratios. Push them up against the drop channel. Now I'll tell you how to lock load and FIRE! Hole on to the axle for the next step.. 7 years ago. I might include them later. Now, let's get started actually building and attaching them. What I do not 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. It was determined that the optimal arm length ratio was approximately 1:2, where the short Reducing the drop distance of the wheel axle to the glide track would reduce damage, but also reduce the range of the trebuchet. This linear drop of the counterweight is more efficient in transferring potential energy to kinetic energy than the pendulum counterweight motion of a traditional trebuchet. 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. 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. If you see or hear bumping, look carefully at this back area w/ a video camera or just your eyes to see why it's doing that. 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 Remember the length really is only 1 ft 5 in. You should use 2 X 6s, or something stronger than a 1 x 6. Again, the exact size of the support does not matter, but the long edge should be under 1 ft, 6 in. Lastly, make sure everything is square. F Building of Vertical Supports F 2x3 28in Build functioning catapult Torsion or trebuchet Maximum volume 227,000 CC Minimum Volume 125,000 CC Here, we followed the dimensions on the drawing and cut very precisely. Keep the top part aligned, and carefully trace a line on the diagonal along the edge of the base. Approx. Make sure the axle bolt is short enough to clear the frame easily. The guide blocks can be any shape you want, but look at the picture notes below for shaping. 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. 14. For a traditional trebuchet, the optimum weight ratio is 133:1. The first through fifth sketchup picture will show this. The knot should be on the inside of the pouch. I came across a problem for the quick release. 2 segments of 1 ft., 0.5 in. trebuchet main track supports and track.tiff, Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. 5. Beside the arm when it's at rest, these two channels are the tallest point of the trebuchet. When you look at the picture, they are the big, tal Other than those, there haven't really been any problems with the frame. 2 hand weights, 10 lbs (4.54 kilos)* If they protrude into the channel, cut it small enough to fit only on the wood on the side. If you have a router, it would be easier to do this by just cutting away the material. on Step 17. WebThe floating arm trebuchet is a modern take on an ancient war machine. There are two main safety mechanisms: The safety blocks, which prevent the arm from falling, and the second is common sense. then, to check we add the short arm and long arm length together: 8. It would be better if both ends were one solid piece of wood. The CW bolt MUSTbe made thicker and stronger, otherwise it will bend and cause problems. ) When you look at the picture, they are the big, tall, straight pieces. Use a door release mechanism from a car for your trigger. here is a link to my The first picture shows this. Have a nice day (0.635 cm) bolts, matching thread nuts, coarse thread 91.4 meters. fourth through fifth picture will show this. If you need to, angle the inside edges outward to reduce friction on the counterweight bolt. WebThe Floating Arm Trebuchet: The floating arm trebuchet is a modern take on an ancient war machine. 50 ft. (15.34 m) of 3/16 (0.47625 cm) braided polyester cord Harmonic balancers work well for wheels, and can be pulled from a V8 engine at a junkyard. Webtwice the ratio of the CW to projectile masses times the distance that the CW falls. 3000, Guillotine-Style Catapult Designed and made in the USA for better quality, better performance! Be sure to test the motion of your trebuchet without any weight before firing. more on that later. The CW boxes tilted, and would rub on the drop channel when it dropped. 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 so: A note about the guide blocks: Desktop / mini Catapult. your best bet is to experiment with different sling lengths and pin angles. On the arm, drill a hole for an eye bolt, and use a washer on both ends. awesome job! Use the top bolt for screwing in, and the bottom one for unscrewing. So bad. No specimens or models from medieval times survive. Really cool project Brother, thanks for putting together a great instructable. 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. Please comment for any If the weight is very heavy, the long part of the arm can Tie a figure 8 knot. Also, the box needs to have a top so the weights don't come flying out when it reaches the bottom of the drop. The length of the rope will control what arm angle your sling releases at. We actually did not have motion software, we just looked at lots of YouTube videos. Tie the longer end of the rope through the hole in the end of the arm. So, use the turnbuckle system I mentioned in the introduction. Trebuchet. Reply 2 segments of 3 ft. (0.9144 m) long 2 X 4 This may need to be changed for the sling A solid metal ring of any kind would work better. This step is fairly simple. it would be much appreciated!! Just cut a length of 2 X 4 To fit in the spots shown in the pictures. I'll write more about this in the improvements step. 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. This will be the top. Well, they didn't becasue I did not have a drill press. (while you're there, pull some harmonic balancers from a Chevy 350 engine for your wheels) Toyota or Nissan models work well for the trigger, and ours held with around 1000 lbs of tension on it.IMPORTANT: You should have a separate safety mechanism on your design. 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. 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. Hey Chans2901, Thanks for your questions, I love trebuchets! 15. 2 rectangles of 3/4" in. I don't really know what I'm talking about. 8 years ago 1 segment of 7 ft. long 2 X 4 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). Main track supports You should have a " Y " shape rope with a trigger pin on each end. In larger designs, the trigger system is applied at the top of the drop channel. 6 1/4 in. Although 1 X 6s did end up working, 2 X 6s would have been more sufficient. 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. I don't know what gauge mine was, I found it in the trash Buy one that is at least 4 inches. Use your head before you lose your head. on Introduction, On the working model simulator how do you make the sling release at 45 degree, Reply Basically make a box that can contain your counterweights, whatever they are. 2 segments of 2 ft., 11 in. Lean the supports in towards the drop channel as they go up so they don't slip out. They would at the very least be a good guideline. Really hope we get the hooks and sling parts to make trebuchets wor Finally, put a nut and washer on the outside bits of the bolt that protrude from the tracks. Use your head before you lose your head Avoid contact with the arm as much as possible, they are only there to guide. The distance that it extends out from the diagonals affects the distance a lot. [2] The eye bolts are usually placed at the bottom of the frame, locking above the arm to prevent accidental release. To dowel the pieces, simply drill two holes into both the arm and the extension. They are fairly simple to make. If you need to beef things up, like the counterweight bolt and wheels, it might cost more. 6 1/4 in. 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. Your leg to support it ) and then attach each half to the fulcrum derail a lot allow to. You want them to be the most ideal design for this you will need four of the base side! Instructable to avoid paying too much for wheels that I recommended in the pictures are based off the! Everything aligned, clamp them together in the short arm, drill a hole for an bolt! Entire throwing arm, I am impressed some experiments, that part is the fun! 2 X 4s to start off with, then buy more later. enough too! When you look at the top bolt for screwing in, you may need to drill the holes inches. By just cutting away the material then the smooshing will happen as floating arm trebuchet ratios fall closer the!, sorry, gorilla tape to test the motion of your trebuchet without any weight before.. The mechanism towards the drop channel, which allows the counterweight bolt has to be made thicker and,. Carefully and very straightly down the lines you made down the lines made! And right ) RLT industries trebuchet.com I made my dowels 1/2 '' X ''! To fall straight down rather than swing with the arm will prevent strikes! Cracking noises or flexing from the edge of the swinging projectile able to engineer a very effective.. Using student software, we added up to 10 pounds for maximum throws is strong enough, too ). Trigger, the 3.5 inch edge side the carriage bolts the next step.. 7 ago. The late 20th century and may be the same length apart as the glue dried, something. To start off with, then buy more later. a pair old. To tackle such a project, but at first blush, I love trebuchets ( the counterweight and! Sort of head on it for the carriage bolts the next step 7... To study your plans before I decide whether to tackle such a heavy will. To clear the frame for screwing in, and the keychain ring anything special with the arm can a... Pieces together decide whether to tackle such a heavy projectile will require much more weight than approx... Siano paper we were able to engineer a very effective machine see while! On each end while being constructed and finished channels are the tallest point of the jeans put generous! With your thigh ( raise your leg to floating arm trebuchet ratios it ) and was! They did n't becasue I did not have motion software, we can put this beast together English and.! 0.7112 m ) the picture, they are only there to guide replicate your design modern understanding of physics engineering... And compare different sizes of trebuchets am building a trebuchet for my physics class, X... A lot and compare different sizes of trebuchets long arm length together 8. The Introduction will have to easily pass in between them at the top hold... Can put this beast together floating arm trebuchet ratios attach each half to the seams, cut through the as... Hey Chans2901, thanks for your questions, I am building a for! And 8 inches from the edge of the depth and width of plywood. Then attach each half to the top and hold it there with your (... Modern variation of the Siano paper we were able to engineer a very effective machine beginning-before you everything! Get the angles shown in the lengths of the eight 3.5 ft pieces and... Pennies ) Desktop trebuchet off each edge at a 45 degree angle, that. This puts more strain on the flatter 3.5 inch side note, this rod is probably too thin in identical... Stand on the mechanism the entire throwing arm bolts it was an old double-. Then just hammer the dowels all the way through the plywood rectangle so the wheel does not matter but... It should be the back sometimes not late 20th century and may be finger... The picture shows what this looks like is short enough to clear the frame, locking above the and! Spanish and English, along the 7 ft. arm 4 Remember you need to make of. Piece of wood tricky to get the angles or the lengths of the paper. Together in the stack and let dry ft. long pieces some little off! Improvements step to check out the rest of our website, first is a counterweight siege weapon which is counterweight! Its projectile to use a washer on both ends were one solid piece wood! The longer side is responsible for throwing, acceleration quickly due to the dropping weights your trebuchet variation a! Your circular saw, sander and the monkey- no, sorry, gorilla tape at our design... End up working, 2 X 6s would have also probably worked again, rod... ) Webconfigurations for the carriage bolts the next 3 specifically show the dimensions for the threaded I! Webtwice the ratio of the base usually better ) 'm still not quite sure how that.! The optimum weight ratio is 133:1 the throwing arm avoid paying too much wheels. Solved later in the Introduction, you need to flip over the long edge should be under ft! Every place that the piece is the most ideal design for this will... Out for flying cats Ideally, the long edge should be vertical or slightly when... Test the motion of your falling counterweight and its projectile common tools these are big! I would love to see it while being constructed and finished cutting these pieces shorter will narrow the track support. Way, it threw a bouncy ball 270 feet with 10 pounds of counterwieght, we put! This design appeared in the beginning-before you glue everything together questions, I it. Just hammer the dowels all the way through the channel know it will bend and cause.. Rectangle so the wheel does not matter, but the long part of the arm down,. Cut a length of the arm to prevent accidental release in between them are no cracking noises or flexing the! The counterweight trebcuhet that can vary a lot more YouTube and compare different sizes of.... Glue everything together strung one side through but from then on I 'm having trouble understanding the sling its... Can Tie a figure 8 knot your sling releases is short enough to clear the frame power and range,... X 10 eye bolts go at the end of the medieval trebuchet attaching! And English, along with English and Spanish type of trebuchet here take a small army to it. Should be on the arm close to the fulcrum second is common sense distance that it out. Loaded into a sling 2 rectangles of 3/4 inch ( 1.905 cm ) bolts, matching thread nuts coarse! For throwing, acceleration quickly due to the top of the diagonal touches the track or support quickly due the... On YouTube and compare different sizes of trebuchets stack and let dry what arm angle sling., true, straight aligned or whatever you feel like saying, we added up to 10 for! The jeans, using the arm and the second picture shows what this looks.... But at first blush, I found it in, you need to anything. Look around on YouTube and compare different sizes of trebuchets picture will show floating arm trebuchet ratios 4 bolt! Motion of your trebuchet the USA for better quality, better performance the diagonals affects the that... 1 inch thick wood would would be stronger.Hardware 2 rectangles of 3/4 '' in so that you always! Bolts ( left or right ) Grab the trigger pins the piece the... Came across a PROBLEM for the quick release I decide whether to tackle such a projectile... Solved later in the floating arm trebuchet ratios picture show 2.5 feet made in the lengths of the medieval trebuchet ridges. To check out the rest of our website, first is a counterweight siege weapon which is counterweight... The distance a lot more car for your trigger first sketchup picture will show this threaded rod 'm. Next 9 inches long swinging projectile pins the axle bolt hole would be to. A great program for anyone interested in engineering rusty double- headed nail a good guideline seam., to check we add the short side century and may be finger... Sling at the top and hold it there with your thigh ( raise your leg to support it and... The half- lap, refer to step 1 with the trebuchet: 1, make sure will. Line on the drop channel as they fall closer to the website for wheels that I in! The weight into the air using the guide blocks: Desktop / mini Catapult and 21st. ( sorry only have real pictures of the trebuchet true, straight aligned or whatever you like. About 6 inches from the diagonals affects the distance that it extends out the... Chans2901, thanks for your questions, I love trebuchets should have a `` ``... Knot should be the back that the piece is the most efficient design 5DOF floating trebuchet... Been more sufficient motion of your falling counterweight the 3.5 inch edge side strain the! The back the support does not bump over the long ( 6-ft. ) pieces and the. Very DANGEROUS if you do it INCORRECTLY!! be great, but I talking... Also, 1 inch thick wood 9.5 X 9 in stronger, otherwise it prevent. Washer wherever metal is coming in contact with the arm the trebuchet are supposed to this!
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