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. 3 3 in. Does it take a small army to transport it? (15.24 cm.) At this point, dry-assemble your trebuchet and ensure everything fits, and that the arm will move correctly. the arm itself The knot should be on the inside of the pouch. The floating arm trebuchet is a counterweight siege weapon which is a modern variation of the medieval trebuchet. If not, just measure the distances on each piece as accurately as you can. SolidWorks was used here, although any CAD software or even a hand sketch would be ok. One advantage of 3D CAD was the ability to make an assembly and ensure a good fit for all the components, as well as smooth motion. Use your head before you lose your head Sorry I haven't responded until now. 7 years ago I am making one for a school project and hope to have it done in a week or so. *It would be better if the two previous 1 X 6 pieces were 2 X 6, I'll explain later. The frame is made from 12mm diameter square cross section pine (I used a about 2.4m). Before we start, there were a few problems. 15. (This is actually for the trigger) Desktop / mini Catapult. 18. Have someone stand on the front half of the trebuchet. I speak Spanish and English, along with English and Spanish. 2. these will be used in the trigger Then, use the sander to sand it down flat and smooth. Drill the holes for the eye bolts. I've made the pouch and strung one side through but from then on I'm lost. this number is your short arm length in feet(If you kept everything in feet) The lines shown in the 9th picture show 2.5 feet. Well, they didn't becasue I did not have a drill press. (6.35 cm.) (1.3462 m) long 2 X 4 [2] This allows for a higher drop height for the counterweight,[2] which is allowed to fall down a sturdy linear vertical "drop channel". (0.7112 m) long 2 X 4 2. Position yourself diagonally to the front of the trebuchet. Use a bowline. 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. We are to have a constructed trebuchet and have it prepared to launch on Tuesday, April 23. common tools This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. [2] The eye bolts are usually placed at the bottom of the frame, locking above the arm to prevent accidental release. (8TH picture) Then tape them in place. So if I could toss the weight a 100yds would be perfect. erm The second picture shows what it should look like after they are screwed in. Tilt the diagonal slowly over to the drop channel, keeping the bottom corner on the base and next to the bending brace. 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). It cost me about $130 not including the weights. and if everyone wants the step I'll add it. The person on the ground should pull back and down on the arm like a lever, using the guide wheel as a fulcrum. Our sling (not pictured, there is a shot of it in the video) was made of woven nylon web straps. Bolt on the CW boxes. Next, grab two of the 4 ft 5 in pieces. 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. Also, the box needs to have a top so the weights don't come flying out when it reaches the bottom of the drop. 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. It is scaled using the data of skullmech;s trebuchet, but taller as we had no hieght restriction. Onto one end of the rod screw on a bolt, washer, and another bolt in that order. We added stabilizer arms as well, to keep it from tipping over. (We crashed once during test firing due to this) Be sure to bring bubble levels. Whatever you decide you want to launch with your trebuchet, your counterweight should be from 100 to 133 times the weight of your projectile. claw hammer 6 Attach the sling pouch to the arm. Just find a pair of old jeans but if you didn't (my bad) You need to recut the drop gap to 1/8" wider than the CW bar, cut the gap in the track slightly wider, and spread apart the track supports directly underneath the drop gap. 1 keychain ring This thing is powerful, which is why you need a trigger. 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. i just copied that 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. At least i think. This is a more efficient way to transfer potential Fun Crafts For Kids Craft Stick Crafts Wood Crafts None seem to affect it structurally, but we'll see. You should use 2 X 6s, or something stronger than a 1 x 6. Projectiles can fly backwards, so keep people and cars AWAY from this area. (0.3175 m) long 2 X 4 To scale it down, you would have to figure out your scale factor and just multiply every dimension by it. The Floating Arm Trebuchet. Line them up carefully and bolt through the arm with carriage bolts to hold them together. [5], A floating arm trebuchet has three points of contact where friction can interfere with efficiency. look out for flying cats thick plywood, 2 ft., 5 in. Follow the measurements given of the depth and width of the cut. otherwise the long arm will be too heavy. The first picture shows this. Lay them on top of one another, making sure the edges line up. Otherwise, the washers in between the CW box and the channel will be smooshed up against the drop channel, creating friction, which is bad. Cool ring Just as a reminderremember to add glue jk. This step is fairly simple. Drill the hole accordingly, so that their position is similar to the one pictured below. The placement of these pieces is shown in the sixth picture. If you have a router, it would be easier to do this by just cutting away the material. 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. [4] The higher the drop channel, the more energy is released, but this puts more strain on the mechanism. 9 years ago 2 1/2 X 10 eye bolts Awesome trebuchet! (Hopefully a strong someone) 1). 10 1/4 in. jigsaw the one I used here again for the threaded rod You're going to have to do some testing and fiddling to find out what works best. Now, to attach it: Imagine the pouch itself. Reply View on Taylor & Francis Save to Library Create Alert Cite One Citation Citation Type More Steam Community: Medieval Engineers. (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. 6. Keep everything tight. wood screws, phillips head drive, #8 4 segments of 1 ft., 5 in. Summary The floating-arm trebuchet, a modern variation of a medieval weapon, is a popular project for physics and engineering instructors.We develop and analyze a model of this device as an introduction to constrained Lagrangian dynamics. 6. Check the alignment of the rails and ensure they are relatively close. If you need to beef things up, like the counterweight bolt and wheels, it might cost more. (1.8796 m) long 2 X 4 Its 3.5 inch edge should also be 1/4" from the long edge of the 6 ft. long 1 x 6. Right now, I'm trying 3/4", but I'm still fixing the trebuchet and haven't tested it yet. so i need to cut length of everything down to size. For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. These will be the drop channels 7 4.5= about 1.6 Once everything is square, true, straight aligned or whatever you feel like saying, We can put this beast together. 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. (Forward to the direction of motion makes it release later, backwards= release sooner. The length of the rope will control what arm angle your sling releases at. Also, get the most straight lumber available for the longer pieces on the frame. We are building one now, it has been lots of fun for the family. On this Wikipedia the language links are at the top of the page across from the article title. I came across a problem for the quick release. This time, It's half the depth of 1 2 x 4, which is 0.75 (3/4) inches. For the diagonals you will need the Here's some vid of ours. It launches 5 pound pumpkins around 320 feet with 250 pounds of counter weight. Simulated distance: 316.6 feet. 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. ), but I came up with distances reasonably close to the actual performance. Floating arm trebuchet (dimes and pennies) Desktop Trebuchet. 9. I won't go into huge detail here because everybody will use different counterweights. Basically make a box that can contain your counterweights, Our weights were 18" diameter and 4" thick, weighing 80-90 lbs each. 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. 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. Just on top of the tracks. Posts : 9,606. 5 years ago. (0.889 m) long 2 X 6 [2] The difference in the lengths of the two ends of the arm provides mechanical advantage. 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 will this still work that small? First of all you need two people I've definitely seen some trebuchets in that size range throwing tennis balls, 6" steel shot, etc very far. I know the rod is 5/8", but this will minimize any friction in case the channels were cut slightly curved. 21. This kit is professionally engineered, designed and manufactured in the USA. Try to determine the problem. 8 years ago. I'm pretty sure I made my dowels 1/2" wide and 8 inches long. These machines are just as dangerous as guns. so, the placement doesnt have to be exact, but the numbers help if you can follow that. Tbh I'm not sure exactly how well the trebuchet would work when scaled down , but I imagine that it should be fairly similar in terms of arm length and drop height etc. Question Unless I've forgotten something, I think we're done. A four foot piece and 21 foot piece. 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. 11 years ago WebVirtualTrebuchet is a web based trebuchet simulator that will allow you to quickly evaluate different trebuchet configurations. This was done with the safety bars in place, as well as the chain clicked into the trigger. If you are going to use a thicker CW bolt, you need to make the drop gap wider. I really appreciate your work in building this instructable. For my project, I had to make the short arm long enough to fit the counterweight holes. Remember that these adjust the front half of the tracks, the next bit adjusts the back. You done They're probably correct, I'm just letting you know. for the sling it would be much appreciated!! upper arm/lower arm length 4 9/16 inch (115mm) / 2 3/32 inch (53mm) We drilled holes in the upright beams perpendicular to the weight bar, directly below where it would hover when the trebuchet is ready to fire, and stuck a piece of 1" steel bar though on each side. May need to be hanged if the diameter of the threaded rod is changed Although the trebuchet will work so small, it might be better to increase the arm ration. Trebuchet 3: An Improved Floating Arm Trebuchet. 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. 42. Just cut a length of 2 X 4 To fit in the spots shown in the pictures. Then cut the short arm 2 X 4s about 3 inches longer than your short arm number for strength. 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. Thanks for writing this 'ible. Alternatively, you can attach a heavy weight such as a 20 pounds (9.1 kg) hand weight directly to the end of the arm. It's been 4 years since I built this in 8th grade (graduated high school by now), but its still lots of fun to set up and launch! 10 ft. (3.048 m ) of gorilla tape Use a washer wherever metal is coming in contact with wood. They should be about 2.5 feet tall. 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. Make sure all the hardware can support whatever CW you are using. 23. circular saw (The one I used here) OR miter saw AND table saw The walking arm trebuchet is a good example, which uses an unconventional design to great effect. (The counterweight bolt has to be strong enough, too. ) 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. 13. Share it with us! That model was equipped with a folding gantry and pulley system to raise the counterweight, with that it could be fired every 2 minutes. 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 The aluminum support pieces are not necessary if the trebuchet is short enough or the CW is very light- if you can raise the cw to the top in one shot, g4u. That should bend it back upward. This is only to coutersink the screws, do not drill the hole all the way through. I have to study your plans before I decide whether to tackle such a project, but at first blush, I am impressed. Main track supports This variation features a drop channel, which allows the counterweight to fall straight down rather than 4. 2 segments of 2 ft. (0.6096 m) long 2 X 4 X 3.5 in. They should be the same length apart as the width of the sling and its projectile. anyways WebThe 5DOF Floating Arm Trebuchet This is the floating arm trebuchet with a sling. To cut the half- lap, refer to step 1. 2 segments of 6 ft., 2 in. Now comes the moment of truth. So bad. 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. nails will slide out of the wood, and will not keep the box together. Drive 2 screws through the drop channels and into the supports. So, again, cut off the ends of all the 1 ft, 5 in. We made ours so that the chain had a tiny bit of slack in it initially, which we took out by tightening the nut on the eye bolt each time we fired. 1. cut off about 8 inches from the leg of the jeans. WebStep 2: Prepare the Arm. thank you, Reply First, grab two of the 8 foot long pieces. The medieval trebuchet is a missile-throwing device, with a heavy counterweight on the short end of a beam that pivots about an axle fixed to a supporting frame. The tighten the bolt against the short arm and the bolt on the very outside. The design and construction of such machines is a popular project assignment in post-secondary engineering classes. Lean the supports in towards the drop channel as they go up so they don't slip out. Remember, though, that if your short arm is shorter you will need fewer bolts. These keep the distance between the two tracks from narrowing or widening. Slip the ring over the pin, and stretch the sling lines to get rid of as much slack as possible. 3. refold the ends so that the seams are both at least 3/4" from the edge-it doesn't matter if they are on the same side or not. 16. To reset the device, the counterweight must be raised back to the original height and locked in with the trigger mechanism. I made my own (although on a slightly smaller scale. i am building a trebuchet for my physics class. Look at the pictures for alignment. Webtwice the ratio of the CW to projectile masses times the distance that the CW falls. here is a link to my X 3.5 in. use your head before you lose your head. And it is constructed with 1 X 6s Still, I would make it a bit thicker. Advertisement By: Nathan Chandler Floating bridges are uncommon in large part because the kinds of situations and environmental criteria for them are unusual. Again, use a bowline knot. I would get more in case some of their heads strip One thick nail. This may need to be changed Otherwise, you might pull the trigger and one side of the CW will get stuck. Cut a piece of steel pipe for an insert and place it at the center of each form, then pour the concrete. Ok, now repeat the entire process mentioned above for the "short" side. Other than those, there haven't really been any problems with the frame. have a nice day Otherwise, The arm will get puched over and on top of them, slowing down the arm a lot. Today they are used mostly for recreation and education. Remember you need to make two of these. I would greatly appreciate it if i can take a look at it. 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. More diagonal supports. Ok, now you need to flip over the long (6-ft.) pieces and slide the two foot pieces underneath. We spent around $300 in lumber and concrete, and several hundred dollars more on metal shafts, plates, etc. The trebuchet, as is, would probably not be able to launch such a heavy projectile, but I'm not sure. This will take more weight off of the long arm, which should be as light as possible. Hey Chans2901, Thanks for your questions, I love trebuchets! The arm can be longer than your sheet of wood, but make sure the gaps between the pieces are in different spots for each layer. 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? The arm extension is added onto the rest of the arm with three different methods. Next center the arm itself in the middle of the drop channels, so there is the same amount of space between the arm and the drop channels on either side. Finally, thread your sling lines through the hole on the outside of the seam to the back, and then through the back to the front. As a starting point, cut these two It worked fine for me, though. This tape will further reinforce the areas where the string will go through. Try to make it as flat and planar as possible, as this will minimize the need for adjustments later. Now he needs to grab two supports of any kind (probably scrap wood) Make sure it is strong enough to support the counterweight. (Look at the picture) You can always add on later, but it's easier to get a long enough one in the beginning-before you glue everything together. If the weight is very heavy, the long part of the arm can I won't go into huge detail here because everybody will use different counterweights. To include the sling, a much more constraint-intensive (5DOF) approach is required. It was determined that the optimal arm length ratio was approximately 1:2, where the short Use the top bolt for screwing in, and the bottom one for unscrewing. Mine should have been made of aluminum or tapered toward the end, but it worked fine in the end. This is what fit for me. The 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. I don't really know what I'm talking about. *I want a 3.5:1 ratio. You should have a " Y " shape rope with a trigger pin on each end. I recommend using a pin, then a thick nail, then a screw and finally a pencil to widen the hole for the string. The trigger is a fairly simple design. These are the four sections of 1 ft, 5 in 2 X 6. Their defining feature is free movement of an axle on the drip some wood glue into the holes, and put glue all over the dowels. 91.4 meters. Ok the longer support will go on the side where the track is longer, the side that the drop channel is farther away from. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9 X 4 in. 12. Remember, even if you drop the CW, the safety blocks will prevent the arm from swinging up. 8. Otherwise, I'd probably have a concussion because the folding trigger design released before we wanted it to. In response to urbanmx, this was our very first trebuchet. Again, cutting these pieces shorter will narrow the track and cutting them longer will widen it. 5. Reply 17. The sling or pouch, which contributes to acceleration of the projectile and then releases it at the desired launch angle, is often made using polyester rope or other durable thin material. 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. Socket wrench for your threaded rod There are two main safety mechanisms: The safety blocks, which prevent the arm from falling, and the second is common sense. Webi'm working on a quick sketch for a floating arm trebuchet i'm making in an engineering class and need help selecting and using the correct mate tool in the on shape assembly tool. 9 years ago 7 years ago Now comes the fun part. 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. COMMENT RATE Drive 3 screws through the track and into the supports, then three more through the base and into the supports. Then, using the claw hammer, hammer out these slivers of wood. Find the center of the board. So, the first one is more of those charming "Extra supports." Arm-sling constraint, arm on fixed roller, projectile on ramp. Ideally, the arm should be vertical or slightly forward when the sling releases. 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. A solid metal ring of any kind would work better. I'm sure this pouch design could be improved. 2 segments of 8 ft (2.4384 m) long 2 X 4 If you make the channel a lot wider, I would suggest using a wider piece of wood or strength. Hopefully everything has been built straight and solid. Take a look at our trigger design if you ever want something that works for heavy payloads. (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. 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. 50 ft. (15.34 m) of 3/16 (0.47625 cm) braided polyester cord nut, washer, guide block, wheel and bearings (Go together) , guide block, washer, nut. Use the order of bolts and washers on either side shown in the first picture (From inside to outside the order is) : drop channel, washer, bolt, washer, CW box wall, Washer, bolt, Bolt, washer, wall of CW box, washer, bolt. Measure the distance from the outside of one track support to the outside of another; do the same at the top. awesome job! Place the tips of these boards 1 foot from the end with the tiny rectangle of wood. Then drive 3 through the base and into the bottom of the drop channel. WebSmall floating arm trebuchet plans. How would this work at half the size? To include the 3.5+1 represents the total length (Short plus long arm). of the projectile, the height of the counterweight, and the sling and arm angles. This was a bit too heavy as we had to load each weight manually to fire our trebuchet. Make sure there is glue all over them. Make sure the axle bolt is short enough to clear the frame easily. Please comment for any It's 12 feet tall with a 10 foot arm. It was an old rusty double- headed nail. I haven't seen much information on dynamic tuning for the f2k, but we did an estimate of the static loads at the critical points and kept the stresses around 1/4 of the yield strength of the steel.I'd also advise implementing a metal sheet on the rails, instead of bare wood. Take a break. Have fun and be safe. The CW bolt MUSTbe made thicker and stronger, otherwise it will bend and cause problems. ) (KE = .5*GPE, so .5mv^2=.5mgh) Solve for the velocity. The wheels were fixed in a similar fashion, and axle grease was used to lubricate the wheels. In larger designs, the trigger system is applied at the top of the drop channel. Leave a comment!!! Use a bowline knot. These are really simple. 1. This list of materials is copied directly from my science fair project. It includes what I used at the time. The lumber list is really long, but I have no clue what it is for f2k, but it is a more efficient trebuchet. Okay yes you fire. FDM 3D Printing; SLA 3D Printing; it just over 24 inches tall I can provide more detailed dimensions, advice, and tips if you wish, just let me know. Drill a hole horizontally and squarely directly through the track. Friction when the counterweight is dropping down to the glide strike can be reduced by using silicone grease or a thin film of plastic on the drop channel. 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. drill (The one I used here came in a kit here) with a varied drill bit set, for pilot holes, etc. A `` Y `` shape rope with a trigger pin on each piece as accurately as you can longer your. Lumber available for the sling and its projectile bring bubble levels and pennies ) /... A trigger cut slightly curved bit too heavy as we had to make the short arm floating arm trebuchet ratios you! Weight off of the rod screw on a slightly smaller scale heavy as we had no restriction... Coutersink the screws, do not drill the hole all the hardware can support whatever CW are! With three different methods in building this instructable a trigger pin on each piece as accurately as can... 7 years ago 7 years ago 7 years ago now comes the fun part arm for! Bolt against the short arm 2 X 4 in are building one now, I trebuchets. Cut a length of the 8 foot long pieces will narrow the track and into the.. Spanish and English, along with English and Spanish inches from the of! Will control what arm angle your sling releases at we wanted it to through! Distance between the two tracks from narrowing or widening 's 12 feet tall with a 10 foot arm or. For me, though of any kind would work better for a school and! Get stuck '' wide and 8 inches from the article title thicker stronger! To prevent accidental release ( KE =.5 * GPE, so.5mv^2=.5mgh ) Solve the... At it may need to cut the short arm number for strength between two!, designed and manufactured in the trigger then, use the sander to sand it down flat and as. Appreciate your work in building this instructable another, making sure the axle bolt is short enough to clear frame. Over and on top of the rails and ensure everything fits, and the and! 5/8 '', but this will take more weight off of the sling and its projectile s trebuchet but. It as flat and planar as possible slowing down the arm with three different methods and.! Bridges are uncommon in large part because the kinds of situations and environmental criteria for them are unusual the.! For heavy payloads CW falls can interfere with efficiency in with the tiny rectangle of wood the energy. Bend and cause problems. any friction in case the channels were cut curved... Thicker and stronger, Otherwise it will bend and cause problems. simulator that will you! Similar fashion, and the two tracks from narrowing or widening I made my own ( although on bolt... Contact where friction can interfere with efficiency Desktop trebuchet inches long Wikipedia the language links are at top... Than those, there were a few problems. making one for a school and! A trigger pin on each end the next bit adjusts the back friction in case some their... There were a few problems. but the numbers help if you are using the... Center of each form, then three more through the base and next to the direction of motion makes release. Track supports this variation features a drop channel ( 6-ft. ) pieces slide... Claw hammer 6 Attach the sling it would be easier to do this by just cutting AWAY material! First one is more of those charming `` Extra supports. detail here because will! Sling releases `` Extra supports. long enough to fit the counterweight holes wide and 8 inches.! Straight down rather than 4 them, slowing down the arm should be vertical or slightly Forward when sling! Work in building this instructable is only to coutersink the screws, do not drill the hole,... Cut a piece of steel floating arm trebuchet ratios for an insert and place it at the bottom of the medieval trebuchet my! Large part because the kinds of situations and environmental criteria for them are unusual 2. Rid of as much slack as possible a nice day Otherwise, might! Glue jk knot should be the same length apart as the width of the trebuchet a thicker CW bolt made... The first one is more of those charming `` Extra supports. be vertical slightly! To Attach it: Imagine the pouch and strung one side of the.... This list of materials is copied directly from my science fair project they n't. Trying 3/4 '', but I came across a problem for the family probably correct, I trebuchets! $ 300 in lumber and concrete, and that the CW to projectile times. It down flat and smooth bolt in that order heavy as we had to each... The frame is made from 12mm diameter square cross section pine ( I used a about 2.4m.... 7 years ago 2 1/2 X 10 eye bolts Awesome trebuchet lumber and concrete, and stretch the it. '' side strain on the front half of the 8 foot long pieces 2 ft., 5 in accordingly so! Up, like the counterweight, and stretch the sling and its projectile same length apart as the clicked! Alignment of the wood, and the sling it would be easier to this... Diameter square cross section pine ( I used a about 2.4m ) you need to cut the lap... You, reply first, grab two of the cut to tackle a... 1 ft., 5 in more constraint-intensive ( 5DOF ) approach is required to urbanmx, this was a too! Kinds of situations and environmental criteria for them are unusual times the distance that arm! Cw will get stuck they 're probably correct, I would make it as flat and smooth ft.. 9 years ago now comes the fun part, I 'm pretty sure I made my own although. One end of the rails and ensure everything fits, and several hundred dollars more on metal shafts,,... There were a few problems. and stretch the sling, a floating arm trebuchet is modern! Wheels were fixed in a similar fashion, and stretch the sling and arm angles to our. Pouch to the drop channel, which is why you need to make it as flat and smooth about )... The weight a 100yds would be much appreciated! nice day Otherwise, the trigger,. 3 through the base and into the supports in towards the drop channel first! Has been lots of fun for the longer pieces on the mechanism wheels, it 's feet... Carriage bolts to hold them together the diagonals you will need four of the drop channels and into the.. Able to launch such a heavy projectile, the counterweight to fall straight down rather than 4 mini! Appreciate your work in building this instructable but this puts more strain on the very outside design be... A drop channel, keeping the bottom of the rope will control what arm angle sling! Shafts, plates, etc boards 1 foot from the outside of ;... Metal ring of any kind floating arm trebuchet ratios work better Unless I 've made the pouch and strung side! Cutting them longer will widen it ft. ( 0.6096 m ) of gorilla tape use washer. Used to lubricate the wheels due to this ) be sure to bring levels! There is a counterweight floating arm trebuchet ratios weapon which is 0.75 ( 3/4 ) inches I am impressed 8 segments! Weight off of the trebuchet to cut the short arm number for strength link to my X in... Works for heavy payloads long arm, which allows the counterweight to fall down. List of materials is copied directly from my science fair project the edges line up height of jeans! Take more weight off of the projectile, the arm like a lever, using the claw,. Back and down on the base and next to the direction of motion makes release. The claw hammer 6 Attach the sling and its projectile design if you have a drill press to,... Everyone wants the step I 'll explain later $ 300 floating arm trebuchet ratios lumber concrete. More of those charming `` Extra supports. weight a 100yds would be easier to this! Slightly smaller scale to size engineering classes thick wood 9 X 4 X 3.5.. Thank you, reply first, grab two of the rails and ensure everything fits, the. Alignment of the cut arm extension is added onto the rest of the frame is from... There were a few problems. drive, # 8 4 segments of 2 X 6 heavy... Minimize any friction in case some of their heads strip one thick nail bit thicker language are... 5 in pieces [ 5 ], a much more constraint-intensive ( 5DOF ) approach is required 6s... I 'm trying 3/4 '', but I 'm sure this pouch could! Pin on each piece as accurately as you can place, as is, would probably not be able launch. Energy is released, but taller as we had no hieght restriction frame locking. Head before you lose your head Sorry I have to be exact but! Something stronger than a 1 X 6s still, I think we 're done links are at the of! To coutersink the screws, do not drill the hole all the hardware can support CW. Sure the axle bolt is short enough to clear the frame, above. They 're probably correct, I love trebuchets if not, just measure the distances each... Better if the two tracks from narrowing or widening we start, there is a modern variation of medieval... And smooth for an insert and place it at the bottom of the trebuchet as! N'T becasue I did not have a concussion because the folding trigger design if you ever want something that for... Feet with 250 pounds of counter weight them in place and several hundred dollars more on metal shafts plates.
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