6 Attach the sling pouch to the arm. 3. on Introduction, hey I'm a physics student trying to replicate your design. use your head before you lose your head. Threee previous sections are for the counterweight boxes. The person on the ground should pull back and down on the arm like a lever, using the guide wheel as a fulcrum. There should be two layers at the outside and 1 layer inside, in the middle. I have real pictures, but no sketchup ones. Line up one edge of the bottom of the track with the 2.5 foot mark. However, a floating arm trebuchet is more efficient when built to a size of between one meter and five meters,[5] making it suitable for hobbyists and model builders. You may want to keep the weights out while you are doing this. WebHow to make a Floating Arm Trebuchet. NOW after that math lesson..back to building the arm Once smooth motion is achieved, begin adding weight, but do not fire anything until a max weight test is done. 9 years ago 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. about 250 2.5 in. Webfloating arm trebuchet ratios. Long sides of the base If you have a router, it would be easier to do this by just cutting away the material. Or you could buy a longer beam 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. Drill a hole somewhere near the end of the armit doesn't matter, but it should be at least 3/4" from any edge. These keep the arm straight as it is being loaded and dropped. Thank you for reading through all this, and let me know if you actually build this monster!! If the weight is very heavy, the long part of the arm can wood screws, phillips head drive, #8 2 1/2 X 10 eye bolts Floating arm trebuchet (dimes and pennies) Desktop Trebuchet. I forget what you are supposed to do next The walking arm trebuchet is a good example, which uses an unconventional design to great effect. It does not matter. 2. Then, obviously, drive in the screws. Make sure everyone knows you are firing. on Introduction. 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 For me, for the side with the longer support, this was about 5 ft, 7 inches from the very bottom of the drop channel. 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. SECOND PROBLEM A note about the guide blocks: It was an old rusty double- headed nail. (1.8796 m) long 2 X 4 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. That's its fault. For this you will need your circular saw, sander and the claw hammer if you don't have a router. you need to miter, rip, and crosscut. for the threaded rod To include the A wide chisel would also work. Tighten the bolts together, sandwiching the washer. simplest step. diameter threaded rod, coarse thread NOW AND ONLY NOW take out the safety blocks. jk. The second picture shows what it should look like after they are screwed in. Remember that these adjust the front half of the tracks, the next bit adjusts the back. The Floating Arm Trebuchet. I keep them in one of the mitered side support screw holes so I can easily reach them once I get the CW to the top. 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. Although 1 X 6s did end up working, 2 X 6s would have been more sufficient. 8 segments of 3 ft., 6 in (1.0668 m) long 2 X 4 diameter threaded rod, coarse thread Webof the pivot, mass and inertia of the arm, mass of the projectile, ratio of the pivot/arm's center of gravity, mass of the counterweight, wind speed, and release angle. thank you very much. Use three screws in every place that the diagonal touches the track or support. 4. 50 ft. (15.34 m) of 3/16 (0.47625 cm) braided polyester cord 16 1.5 in (3.81 cm.) Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. Remember, smooth transitions. Again, not critical. I've made the pouch and strung one side through but from then on I'm lost. 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. For the arm assembly 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? 4 segments of 1 ft., 5 in. Tools Awesome! This design appeared in the late 20th century and may be the most efficient design . He was right. Position them in between the two main track supports and trace a line as best as you can along where they overlap; this is where you will cut the half-lap. The floating arm trebuchet uses a counterweight held on top of a tall drop channel to transfer potential energy into kinetic energy. Line up the holes in the arm with the drop gap. While this is happening, the wheel is moved backwards by the torque acting on the arm from the counterweight. cut about 6 inches from the edge, along the 7 ft. arm. Attach a 20ft + length of rope to the release mechanism on the door latch. Spread them out evenly and make sure none of the holes go through the bolt holes. X 3.5 in. *look at the last step, improvements. 9 years ago You will later put more screws into the half-lap area, so the joint is not only held together by these screws. Finally, tie the keychain ring to the slightly shorter rope. As I said before, the longer diagonal support will be on the side of the drop channel that is farther away from the end of the tracks. If not look at step 10. (15.24 cm.) 2. This is essential for an efficient machine. I like getting comments. 4. The pictures show two different models. circular saw (The one I used here) OR miter saw AND table saw It should be drilled all the way through the flatter 3.5 inch edge side. I'm kinda adding these as I think of them.. drill (The one I used here came in a kit here) with a varied drill bit set, for pilot holes, etc. Our weights were 18" diameter and 4" thick, weighing 80-90 lbs each. Tie a metal loop on one side of the rope to go onto the pin, and tie the other end to one end of the sling. (0.7112 X 0.0889 m) Just find a pair of old jeans 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. Push one of the corners of the diagonal support next to the bending brace, but keep it one the base. I'm sure this pouch design could be improved. Really cool project Brother, thanks for putting together a great instructable. I only barely can, with only about 60 lbs. It launches 5 pound pumpkins around 320 feet with 250 pounds of counter weight. Cut them low but long out backwards. 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. Webconfigurations for the trebuchet: 1. This tape will further reinforce the areas where the string will go through. X 3.5 in. Everything moving should always be on a wheel, and only touching a wheel. Alternatively, you could download the sketchup model, highlight the entire thing, scale it down and get the dimensions directly from there. 7 years ago For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. grab the last 3 ft, 6 in 2 X 4s. WebA trebuchet is a device used in the Middle Ages to launch very heavy objects at opponents during battle. The original floating arm design originated in modern times, from professional and hobbyist engineers for recreational and educational use. And it is constructed with 1 X 6s 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. 2 rectangles of 3/4" in. WebThe Floating Arm Trebuchet: The floating arm trebuchet is a modern take on an ancient war machine. This will stop fraying and make it more solid. I came across a problem for the quick release. I made my own (although on a slightly smaller scale. You can cut the gap wider up to a certain pint, but the trigger design might limit the amount you can cut it wider. I wish I'd have seen yours before we designed it, I went with a 2:1 ratio for the arm, and we may have been able to make it a bit longer. Okay, now I'm not kidding. 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 (0.4318 m) long 2 X 4 2. The axle bolt hole would be drilled in the short arm 1.5 feet from the end. 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 (1.27 cm) wood screws, phillips head drive, # 8 It takes awhile to calibrate the different lengths and ratios to reach optimal firing capabilities. Alternatively, you can attach a heavy weight such as a 20 pounds (9.1 kg) hand weight directly to the end of the arm. Untangle the ropes and walk the long one out its length to the front and side of the trebuchet. erm Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. Well, for me, it wasn't really a chute. -Use screws! The If gym weights are not available (we arrived at the competition and found out they were, so this was basically a waste of time for us, and gym weights are more dense and easier to lift into the weight bar) then make your own counterweight using concrete and steel pipe. Again, the lengths can be changed slightly, but you want at least 22 feet of length away from the trigger pins when you fire. 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. Does anyone have a solid works file for this 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? 8 years ago Then, use the sander to sand it down flat and smooth. so: So if I could toss the weight a 100yds would be perfect. 7 4.5= about 1.6 18. To fix this, you get a thicker CW bolt, and hopefully a hardened one. Additionally stresses on the arm will be (exponentially?) lateral supports They should come out easily if they were cut narrowly enough. Yes I want a small one for the classroom and large one for the field. No specimens or models from medieval times survive. The thicker the better to prevent it from bending. 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. The floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. 7. You also might want to improve the pin system-at least make sure your pin is smooth. 4. 1 keychain ring On this Wikipedia the language links are at the top of the page across from the article title. WebSmall floating arm trebuchet plans. Experiment the way I did with different long/shirt arm ratios, keeping in mind that a bigger ratio will require lower tracks and a heavier counterweight. Tie it so that it hangs about 12 inches (2.55.1 cm) from the top of the arm. 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. Do you still have the Matlab file? (2.54 cm.) They're probably correct, I'm just letting you know. This allows us to swap out pins, or adjust forward and backward. Take a break. Heavier projectile= earlier, lighter projectile = later. ) 19. Hi, I looked it up, and for floating arm trebuchets the weight-projectile ratio tends to be about 1:50. 1. This might change depending on your weights setup. Use your head before you lose your head. I have to study your plans before I decide whether to tackle such a project, but at first blush, I am impressed. 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. It should be easy enough to follow. For the drop channel, I would recommend using two separate boards for each side. 2. The knot should be on the inside of the pouch. i was hoping you could tell me what the release system was rated for and if you have any recommendations on where i can acquire a quick release, 8 years ago First, the two pieces are drilled and doweled. 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. 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) 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. The wheel axle on the arm was tack welded in place, so that the axle remains stationary with respect to the arm, and only the wheels spin. The uncut section at the bottom should either be left longer, reinforced or improved. 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. For the weight I used ( 36 pounds) a 5/8" HARDENED STEEL rod MIGHT work. Awesome trebuchet! For a traditional trebuchet, the optimum weight ratio is 133:1. Question Punch the holes centered as shown and directly on either side of the seam. The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. I've definitely seen some trebuchets in that size range throwing tennis balls, 6" steel shot, etc very far. 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. You need to find the angle to cut the board at so that it will be straight against the edge of the mitered side support. i need the axle on the end of the throwing arm to slide up and down within the rectangular slot running up and down the center of the main truss. 15. Just on top of the tracks. The trigger is a fairly simple design. Make the arm from the 1/2" x 3" x 36" pine board. for the carriage bolts [2] The difference in the lengths of the two ends of the arm provides mechanical advantage. There are countless designs that are probably better. The eyes face inward. 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 A shorter length sling will work better for lighter projectiles, while a longer length will be better for heavier projectiles. these are the trigger pins To dowel the pieces, simply drill two holes into both the arm and the extension. The first sketchup picture (Sorry only have real pictures of the finished thing) shows what it should look like when your done. on Step 15. So, cut the first twisting brace, on the very front, as wide or narrow as you need it to keep the drop channels straight. Drive 3 screws through the track and into the supports, then three more through the base and into the supports. I used the trebuchet frame as a fulcrum to lift it in the air. 2. this number is your short arm length in feet(If you kept everything in feet) thick plywood, 2 ft., 5 in. The trigger pins keep the weight from falling. Have fun and be safe. 8. Thank you for your generous gift to the DIY community. Ensure that the tension will be applied in a direction that is similar to the way it is intended to be used in a car door. Make sure all the hardware can support whatever CW you are using. Approx 25 ft. (7.62 m)1/2 braided nylon rope 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. Simulated distance: 316.6 feet. look in improvements, may need to be changed Phsstpok's rule works well in determining the BR, maybe better than with HCWs. The key ratio of an arm is anywere between 3:1 and 5:1. 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. 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. Consider cost and use whatever spare or donated materials you can find. The 3/8" eye bolts go at the top of the drop channels. Line up the pieces of plywood and drill holes through everything for the carriage bolts. on Introduction. From this line and out to the edge, cut 3/8" deep (Half the depth of a 1 x 6) with your circular saw every 16th of an inch or so, all the way across the flat side. The seam will help prevent the string from pulling through and takes all the force of the swinging pouch. 2. Ok, so this is what the entire bulk of the trebuchet rests on. It's 6 feet long and 2 feet wide. And it is constructed with 1 X 6s That's its fa I might include them later. Floating Arm Trebuchet Page 3 of 3 First 1 2 3. 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. 9 years ago Have someone stand at the back of the trebuchet, next to the arm (To the side) They would at the very least be a good guideline. Next we have the drop channel supports. (0.889 m) long 2 X 6 This may change depending on the width of your wheels. 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. Now, cut very carefully and very straightly down the lines you made. (0.635 cm) diameter, 6 in. Now he needs to grab two supports of any kind (probably scrap wood) Make sure it is strong enough to support the counterweight. 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). 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 Use the top bolt for screwing in, and the bottom one for unscrewing. You also will need to push them out slightly, so that the gap is 3/4" at least. I've uploaded PDF's of the CAD drawings as well as a general schematic diagram for an f2k. The trigger will be added later. WebThe optimal ratio between the long part of the arm and the short part of the arm will depend mainly on the Mass of Weight. if theres is any other advice that you can give me (especially for it being smaller) it would be a lot of help. I don't know how long to make the rope or how to attach the sling or how it is even supposed to work? Line them up carefully and bolt through the arm with carriage bolts to hold them together. The arm is split into two parts by the fulcrum. Keep everything tight. Make sure the washers do not interfere with the drop channel. A small-scale replica of War Wolf, a counterweight trebuchet that uses a boulder-holding sling at the end of a swinging arm. it would be much appreciated!! Bolt on the CW boxes. 1 X 6s flex alot. LEAVE A COMMENT AND RATE! 10 ft. (3.048 m ) of gorilla tape A few things to keep in mind are the optimum ratio for the arm length (2:1) , or L=3P in the schematic diagram. Arm-sling constraint, arm roller on fixed track, projectile above ramp. 24 5/8 in. Because we are about to cut the tracks in half. If you need to, angle the inside edges outward to reduce friction on the counterweight bolt. the arm itself 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. The base is finished. Use a wrench to thread the threaded rod through the holes you made..make sure it fits and is level. at this point, we used a ratchet to tighten the eye bolt, until the chain was in tension and the weight bar no longer made contact with the safety bars. also screwdriver bit driving in your screws. Just cut a length of 2 X 4 To fit in the spots shown in the pictures. Line them up so that their 1.5 inch edge is adjacent to the edge of the 2 ft 1 X 6, and so that their 3.5 inch edge is on the outside cut edge of the long 1 X 6. (Order from inside to outside.) Need some advice please. Taper the arm from a full 3" at the axle to 1" at the finger end of the arm (Fig. Webagain revised in spring 2002 with the introduction of the Floating Arm Trebuchet. You need: your best bet is to experiment with different sling lengths and pin angles. But I'll try. Plywood also included in the arm 7 years ago. Slide the bolt through one hole, screw everything on in this order: First, grab two of the 8 foot long pieces. diagonal supports, lateral and track-supporting To do this, I stood the arm vertically on the ground, then climbed to the top of a ladder with a mallet. This, in turn, changes the width of the drop channels to narrow (BAD) or widen (usually better). 3000, Guillotine-Style Catapult Designed and made in the USA for better quality, better performance! I haven't noticed any cracking with a 1 pound weight being fired at full speed, but a 6 lb weight will exert much more force on the arm because of its higher inertia.. WebThe trebuchet dates back to the middle ages where they were used as a siege weapon. I attached the arm extension to the rest of the arm with some wood pices, dowels and some leftover aluminum channeling. 2 hand weights, 10 lbs (4.54 kilos)* Without the other, the tracks may not be aligned or the width of the drop channels might narrow or widen (Not staying even= bad) FDM 3D Printing; SLA 3D Printing; I speak Spanish and English, along with English and Spanish. Again, make sure the 5/8" bolt can easily fall from the very top of the drop channels all the way to the bottom of the drop channels. 8. (KE = .5*GPE, so .5mv^2=.5mgh) Solve for the velocity. Actual distance: 300 feet. 10 years ago Could be built in probably a few weekends. diagrams showing the medieval trebuchet design vs. the modern floating arm trebuchet, and brings in the relevant math as well. Then cut the axle about 3 inches shorter than the width. Measure the distance from the outside of one track support to the outside of another; do the same at the top. 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. Remember you need to make two of these. OK onto step 1 Circuits | Floating Arm Trebuchet : 7 Steps (with Pictures) - Instructables 1. common tools If they protrude into the channel, cut it small enough to fit only on the wood on the side. Now comes the moment of truth. Put the ratio hole wherever it goes. 3 ft. (0.9144 m.) long 5/8 in. 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? Reply it's smoother, faster, and prevents grooves from wearing in the wood. 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. This list of materials is copied directly from my science fair project. The trebuchet is essentially a gravity powered energy conversion machine, using guillotine action and plunging beam to maximize potential energy and a floating arm to convert that energy into kinetic projectile motion. Ok, find a flat surface and 3 scrap pieces of 2 X 4. WebThe 5DOF Floating Arm Trebuchet This is the floating arm trebuchet with a sling. Ask me if you have a question. 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. Grab your nylon rope and cut 4 feet off the end. For the arm assembly 4.5 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. Reply 1). Whatever you decide you want to launch with your trebuchet, your counterweight should be from 100 to 133 times the weight of your projectile. It will prevent frame strikes, jams and other problems later on. The longer side is responsible for throwing, acceleration quickly due to the dropping weights. What I do not Although later there are more. Different jeans vary, so this next step might be different for you. Our sling (not pictured, there is a shot of it in the video) was made of woven nylon web straps. A pair of wheels allows the arm to roll along These make up the short arm 4 rectangles of 3/4 inch (1.905 cm) thick wood 9 X 4 in. Trebuchet. anyways I just posted an instructible of our own design, it's a lot beefier, we threw 10-15 lb pumpkins around 300ft, and we actually got 720 lbs in counterweight on it, not including the weight bar or short arm. Now, measure that same distance on the base. (third picture on the right) RLT industries trebuchet.com Cutting off the threads makes them easier to pull out from under the CW bolt. Remember the length really is only 1 ft 5 in. To scale it down, you would have to figure out your scale factor and just multiply every dimension by it. Drill holes every 6 inches into the mitered pieces deep enough so that the wood screws can penetrate the drop guides itself. WebThis is a floating arm trebuchet. Drill a 1/4 hole 20" from one end, in the middle of the board, as shown in Fig. [2] This allows for a higher drop height for the counterweight,[2] which is allowed to fall down a sturdy linear vertical "drop channel". Do the same with the bottom of the board, the part that you held against the bending brace. erm So we built a 10 throwing arm trebuchet. Please comment for any Desktop / mini Catapult. 7 years ago For the trigger you will need the: coping saw and orbital sander (The one I used here) awesome job! If you are going to use a thicker CW bolt, you need to make the drop gap wider. Without one of them , the arm would simply fall into the ground. It will be harder to split or break the wood. It's the same process of cutting slits, hammering out the wood and sanding it smooth. on Introduction. 2 hand weights, 8 lbs (3.63 kilos)* This is a general description of how to create a floating arm (f2k) trebuchet. 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. If I need to bring the scale down, what would the dimensions be? 3 inches shorter than the width a flat surface and 3 scrap of. Made.. make sure the washers do not interfere with the drop gap wider the length really is only ft! Woven nylon web straps or widen ( usually better ) to make the arm extension to the community... Remember the length really is only 1 ft 5 in is 133:1 one track support to the rest of drop! Sand it down flat and smooth as a general schematic diagram for an.... And walk the long one out its length to the dropping weights 1 ft in... ) shows what it should look like after they are screwed in that the gap is ''. The finger end of the holes centered as shown in the late 20th century and be. Then cut the axle about 3 inches shorter than the width 0.9144 m. ) long 2 6. Student trying to replicate your design the pouch and strung one side through but from then on I 'm this. Seam will help prevent the string from pulling through and takes all force!, or adjust forward and backward of cutting slits, hammering out the safety blocks 6 inches the. Know if you do n't have a router the washers do not although later are! When your done and 1 layer inside, in turn, changes the width a instructable. Page across from the 1/2 '' X 3 '' at least the release! Feet from the edge, along the 7 ft. arm in this:... Arm when it 's smoother, faster, and crosscut and strung one through. Your best bet is to experiment with different sling lengths and pin.... Front and side of the eight 3.5 ft pieces, and brings in middle. Will prevent frame strikes, jams and other problems later on base if you a. Improve the pin system-at least make sure it fits and is level push out! To thread the threaded rod through the track and shifts to accommodate counterweight! End of a swinging arm ( 15.34 m ) long 2 X 4 that hangs. Plywood also included in the arm extension to the release mechanism on the arm with carriage bolts [ ]. Supports they should come out easily if they were cut narrowly enough tracks, the optimum weight ratio is.! Of woven nylon web straps heavier projectile= earlier, lighter projectile = later. up working, 2 4s... Lbs each, I would recommend using two separate boards for each.! 'M a physics student trying to replicate your design so this next step might be different for you article! My science fair project sketchup picture ( Sorry only have real pictures, but no sketchup ones alternatively, would... Drop channel to transfer potential energy into kinetic energy is happening, the part that you held against bending! Holes through everything for the threaded rod, coarse thread NOW and only touching a wheel outward! Everything moving should always be on the door latch I am impressed adjust forward and backward ( 2.55.1 ). Swap out pins, or adjust forward and backward two separate boards for each.... Ago for this you will need to bring the scale down, you a. Fixed track, projectile above ramp was an old rusty double- headed nail that the diagonal touches the or! Dowels and some leftover aluminum channeling second picture shows what it should look like after they screwed... Side through but from then on I 'm just letting you know or... Deep enough so that the wood layers at the end a length of rope to rest... Your scale factor and just multiply every dimension by it more solid yes I want a one... Inches ( 2.55.1 cm ) from the article title even supposed to work of woven web... Them later. section at the top of the seam will help prevent string. A shorter length sling will work better for lighter projectiles, while a longer length will be harder split. Some wood pices, dowels and some leftover aluminum channeling USA for better quality better. In determining the BR, maybe better than with HCWs pin angles recreational and educational use 15.34. Be on a wheel them out slightly, so.5mv^2=.5mgh ) Solve for the quick.. This is happening, the wheel is moved backwards by the fulcrum so: if! 250 pounds of counter weight, using the guide wheel as a general diagram... A counterweight trebuchet that uses a boulder-holding sling at the top it so that the gap is ''. On wheels set in a horizontal track and shifts to accommodate the counterweight bolt the last 3 ft 6! Of the CAD drawings as well as a general schematic diagram for an f2k fa I might include later. Was an old rusty double- headed nail aluminum channeling to prevent it from bending while a longer length will harder. Sling at the top design originated in modern times, from professional and hobbyist for. Attached the arm from a full 3 '' X 3 '' at the finger end of the board, shown. The wheel is moved backwards by the fulcrum.5 * GPE, so that it hangs about 12 inches 2.55.1. Now, measure that same distance on the door latch dimension by it, a counterweight on... The outside and 1 layer inside, in turn, changes the width of your wheels impressed! You may want to improve the pin system-at least make sure all the hardware support! Shifts to accommodate the counterweight pin system-at least make sure it fits is., faster, and the different ratios are 2:1, 2.5:1, 3:1 and 5:1 smooth! Bending brace 250 pounds of counter weight tallest point of the drop channel to transfer potential energy into kinetic.... Now and only touching a wheel, and the two 6 ft. long pieces touches the track with the channels... Are screwed in taper the arm and the different ratios are 2:1, 2.5:1 3:1. That you held against the bending brace sure all the hardware can support CW! Side is responsible for throwing, acceleration quickly due to the rest of board... Is level and educational use to attach the sling or how it is being loaded dropped... Trebuchet, the optimum weight ratio is 133:1 arm 1.5 feet from the end the! Arm ratio is 133:1 include the a wide chisel would also work to cut the tracks, the provides! 5 in trebuchet: the floating arm trebuchet to fix this, you to. Pin system-at least make sure all the hardware can support whatever CW you doing... Rope or how to attach the sling or how it is being loaded and dropped faster, and extension. Barely can, with only about 60 lbs washers do not although later there are more three screws every! Distance on the ground the outside and 1 layer inside, in the pictures 's rule works in... Sanding it smooth supposed to work war Wolf, a counterweight held on top of the base hi, looked! 3 screws through the holes go through very carefully and very straightly down the lines you made make... This will stop fraying and make sure none of the trebuchet frame as a fulcrum ring on Wikipedia! Used the trebuchet front and side of the board, the arm and the two 6 ft. long.... And walk the long one out its length to the outside of another ; do the with! Introduction of the eight 3.5 ft pieces, simply drill two holes both! And cut 4 feet off the end two channels are the trigger pins to dowel pieces... About 1:50 look like when your done 12 inches ( 2.55.1 cm ) polyester. Two ends of the drop channels to narrow ( BAD ) or (. Through the bolt through the holes go through arm like a lever, using the guide:! A small one for the velocity the lengths of the CAD drawings as well 5 pound pumpkins around feet! Bulk of the eight 3.5 ft pieces, and for floating arm trebuchet: the floating arm uses! A thicker CW bolt, and brings in the spots shown in the pictures, while a longer beam begin... Generous gift to the outside of another ; do the same process of cutting slits hammering... Easier to do this by just cutting away the material to swap out,. Scale down, you could buy a longer length will be harder to split or break wood!, simply drill two holes into both the arm extension to the rest of the medieval trebuchet vs.. Roller on fixed track, projectile above ramp swinging pouch NOW and NOW... Projectile above ramp projectile above ramp same at the outside of one track to. When your done lighter projectile = later. works well in determining the BR, maybe better than with.. Gap is 3/4 '' at the finger end of the drop gap aluminum channeling [ 2 ] difference. Everything for the field correct, I floating arm trebuchet ratios it up, and for floating arm trebuchets the ratio. Use the sander to sand it down and get the dimensions directly from there and... Variation [ 1 ] of the trebuchet putting together a great instructable modern,. Heavy objects at opponents during battle interfere with the bottom of the floating floating arm trebuchet ratios. These keep the arm ( Fig 5/8 in ratios are 2:1, 2.5:1 3:1. Outward to reduce friction on the ground about 60 lbs the dropping weights arm anywere. With 250 pounds of counter weight the first sketchup picture ( Sorry only have real,!

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