Otherwise, the washers in between the CW box and the channel will be smooshed up against the drop channel, creating friction, which is bad. This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. I would greatly appreciate it if i can take a look at it. Use plenty of screws as well as resin, gluing and screwing each layer to the next. 1. (Forward to the direction of motion makes it release later, backwards= release sooner. Advertisement By: Nathan Chandler Floating bridges are uncommon in large part because the kinds of situations and environmental criteria for them are unusual. Then just bolt it all upYou can look at and copy my bolt arrangement if you don't really know what to do. Then, drive in the screws. Mark the height that you want the diagonal support to rise to. These can be found cheap at any junkyard. Posts : 9,606. 3/8 X 4 eye bolt (Including bolts) nuts, coarse thread Webagain revised in spring 2002 with the introduction of the Floating Arm Trebuchet. 7 years ago A few things to keep in mind are the optimum ratio for the arm length (2:1) , or L=3P in the schematic diagram. (0.635 cm) diameter, 5.5 in. Cut a piece of steel pipe for an insert and place it at the center of each form, then pour the concrete. The 3/8" eye bolts go at the top of the drop channels. 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. these will be used in the trigger about 250 2.5 in. It shouldn't be too deep or to shallow for your projectile, and should hug the surface of your projectile well. This is the pin. When firing, make sure no-one is down range, near to, or directly behind your trebuchet. on Step 17, Hey, I definitely encourage you to do this! So, cut the first twisting brace, on the very front, as wide or narrow as you need it to keep the drop channels straight. [7] A projectile is loaded into a sling at the end of the throwing arm. Your arm should look nice and smooth like the pics. I like the adjustable arm ratio. Tie it so that it hangs about 12 inches (2.55.1 cm) from the top of the arm. On the folds themselves, use one strip of tape per side with a slight bit of overlap and stick the two pieces together. 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. You want to keep the width relatively narrow, but wide enough to accommodate whatever projectiles you plan to use. [3] If you We built a trebuchet that we call the medieval stuff chucker (MSC). Ask Question Comment Download These are the 2 2 ft. long 2 X 4s. Mortise and tenon joints here would be best, but I didn't feel like they were necessary. I'd look around on YouTube and compare different sizes of trebuchets. these will be used in the trigger 10 1/4 in. more on that later. This way, the screws take force from top to bottom, not sideways. Now, to attach it: Imagine the pouch itself. WebThen, the floating arm trebuchet's arm length ratio and sling length were then optimized. I have to study your plans before I decide whether to tackle such a project, but at first blush, I am impressed. have a nice day The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. (6.35 cm.) 3. Harmonic balancers work well for wheels, and can be pulled from a V8 engine at a junkyard. (0.2413 X 0.2286m) Without the other, the tracks may not be aligned or the width of the drop channels might narrow or widen (Not staying even= bad) These are the pieces of wood directly on either side of the drop channels. 1. cut off about 8 inches from the leg of the jeans. Then, use the sander to sand it down flat and smooth. 8 .5 in. "Illinois Institute of Technology students build catapults to toss pumpkins", "Pumpkin Festival aims to be bigger and better", https://en.wikipedia.org/w/index.php?title=Floating_arm_trebuchet&oldid=1126960959, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 12 December 2022, at 04:31. 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. 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. with that. Licensed under CC BY 3.0, via Wikimedia NOW AND ONLY NOW take out the safety blocks. Place the hole for the counterweight bolt about an inch and a half from the end. Short sides of the base 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. DRILL PILOT HOLES FOR EVERYTHING!!!!!! For me, for the side with the longer support, this was about 5 ft, 7 inches from the very bottom of the drop channel. Here's some vid of ours. (Hopefully your friends haven't deserted you over this trebuchet obsession. Thank you for reading through all this, and let me know if you actually build this monster!! The uncut section at the bottom should either be left longer, reinforced or improved. Could be built in probably a few weekends. drive 3 screws through the base and into the bottom of the diagonal, and 3 more through the diagonal and into the mitered side support pieces. Use your head before you lose your head 7. Now we're finally going to add the last few lateral supports and the guide wheel. They should come out easily if they were cut narrowly enough. I have no idea if this is the most ideal design for this type of trebuchet. The length of the rope will control what arm angle your sling releases at. We spent around $300 in lumber and concrete, and several hundred dollars more on metal shafts, plates, etc. 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. The person standing on the trebcuhet is no longer in danger unless he drops the bolt on his foot. 2 segments of 6 ft., 2 in. We think that the downward throws were caused by these two heads. so: At the current position they dont utilize all of the work you did lifting your weights.Here is a floating arm that two other students and I from FRC team 11 MORT designed for punkin chunkin in Delaware. And lastly, for the extra supports, we have the lateral diagonal supports. (0.7112 m) long 2 X 4 Best catapult ever (98 ft) Load more 3D Printer Info. This list of materials is copied directly from my science fair project. 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. Next, going to the back of the frame, we have the guide wheel and the guide blocks. 6. The angle and length of the pin control when the sling opens. I don't really know what I'm talking about. As it turned out, our design was over built and held up well. 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. Awesome! *It would be better if the two previous 1 X 6 pieces were 2 X 6, I'll explain later. At this point, dry-assemble your trebuchet and ensure everything fits, and that the arm will move correctly. Whenever you feel like it, slip in the other trigger pin, with the eye toward the front. NEVER, NEVER LEAN OVER THE ARM!!! Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz) New 08 Jul 2012 #21. 2 segments of 2 ft. (0.6096 m.) long 5/8 in. I would get more in case some of their heads strip You can cut the gap wider up to a certain pint, but the trigger design might limit the amount you can cut it wider. Also, get the most straight lumber available for the longer pieces on the frame. To reduce friction of the sling on the launch track, the track should have a smooth surface.[5]. Diagonal Track supports. 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 It will be harder to split or break the wood. Approx 25 ft. (7.62 m)1/2 braided nylon rope Put a generous amount of glue on the flatter side, the 3.5 inch side. 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. Our shafts were steel bar. Now you simply lay the 6 ft pieces across the supports, lining up the edges, and drive three of the 2.5 inch screws into through the track and into the supports. WebThe 5DOF Floating Arm Trebuchet This is the floating arm trebuchet with a sling. All scaled proportionally from the larger version (the tall vertical pieces are 130mm long, throwing arm 150mm). 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. 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. The weight bar was 1.5" diameter, AISI 4140 cold drawn (probably overkill) and the axles were 1.2" diameter, AISI 1020 CD. 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. WebStep 2: Prepare the Arm. They should be the same length apart as the width of the sling and its projectile. Pretty nice, but you could get a lot more power by lowering your tracks by about a foot. F Building of Vertical Supports F 2x3 28in Build functioning catapult Torsion or trebuchet Maximum volume 227,000 CC Minimum Volume 125,000 CC And back up at least 20 feet when firing (The sides are safest) Stick a few inches of tape over that area, making sure you get it on the inside and outside of the seam. 50 ft. (15.34 m) of 3/16 (0.47625 cm) braided polyester cord The two marks should be 6/8" apart. User Projects. 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. Otherwise, I'd probably have a concussion because the folding trigger design released before we wanted it to. To include the sling, a much more constraint-intensive (5DOF) approach is required. 8 matching cut washers trebuchet main track supports and track.tiff, Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. 1 segment of 7 ft. long 2 X 4 23. 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. Next tape all outside edges so that the perimeter is completely taped. You may want to keep the weights out while you are doing this. Now, drive 2 screws through the mitered pieces on the side, and straight into the track. Tape measure, ruler This kit is professionally engineered, designed and manufactured in the USA. The first 5 pictures (except the first and second) specifically show the dimensions for the "long" side. 8. (See 4th photo, near top of the trebuchet, steel bars hanging out)For the trigger: Cut a stepped, square slot out of a piece of lumber, as shown in the first photo, and screw your mechanism into the wood. 1). Arm-sling constraint, arm on fixed roller, projectile on ramp. The classic beam ratio for a FAT is 2:1. 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. Here, we followed the dimensions on the drawing and cut very precisely. Then, using the claw hammer, hammer out these slivers of wood. Use the top bolt for screwing in, and the bottom one for unscrewing. It would be better if both ends were one solid piece of wood. 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. By tightening these outside bolts, you can change the alignment of the tracks and narrow or widen the distance between the drop channels. Beside the arm when it's at rest, these two channels are the tallest point of the trebuchet. The knot should be on the inside of the pouch. NOTE: all CAD modeling was done using student software, for educational purposes. 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. 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. Threee previous sections are for the counterweight boxes. 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. On each piece, mark 5.5 inches (The real width of a 1 X 6) from each cut edge. washers We'd have done much better with something like this. on Step 15. 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. I'm still working on the "improvements" page but everything I was going to mention on it was kind of already mentioned throughout the instructable. They should be about 2.5 feet tall. This ring will be what loops around the pin. 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. [2] This allows for a higher drop height for the counterweight,[2] which is allowed to fall down a sturdy linear vertical "drop channel". Keep the top part aligned, and carefully trace a line on the diagonal along the edge of the base. The walking arm trebuchet is a good example, which uses an unconventional design to great effect. The design and construction of such machines is a popular project assignment in post-secondary engineering classes. (The counterweight bolt has to be strong enough, too. ) 6 1/4 in. Although the trebuchet will work so small, it might be better to increase the arm ration. Again, the lateral placement in this corner does not matter as long as both edges of the diagonal meet evenly along the track and support. leaning, tilting marking, etc. Tilt the diagonal slowly over to the drop channel, keeping the bottom corner on the base and next to the bending brace. The frame is made of 4x4 held together with deck screws and carriage bolts, and our design allowed for the frame to be removed from the base with bolts only. therobotichand, would you mind posting any materials or tutorials you used? (KE = .5*GPE, so .5mv^2=.5mgh) Solve for the velocity. Measure the distance from the outside of one track support to the outside of another; do the same at the top. If you need more help with the guide blocks let me know. Okay now you need to cut the axle. (1.5875 cm.) 2 segments of 6 ft. (1.8288 m) long 2 X 4 So, if you want them to be the same height, you may need to change the angles or the lengths mentioned here. Virtual Trebuchet is a free web based trebuchet simulator. Finally, thread the Axle through the other hole in the middle of the arm. Masses are lead (6x125g) cast from lead roof flashing. This may need to be changed 7. this number is your short arm length in feet(If you kept everything in feet) WebFloating Arm Trebuchet - Hobbyist Version The F.A.T. It does not matter. look out for flying cats Grab your nylon rope and cut 4 feet off the end. Twisting braces ? 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. 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. (We crashed once during test firing due to this) Be sure to bring bubble levels. Lumber And, I'm not looking to chuck this 200yds. The 5/8" CW bolt bent like a taco with only 16 pounds on either side. 1/4" at the very most. Mine should have been made of aluminum or tapered toward the end, but it worked fine in the end. If you want a better pin system, look at the turnbuckle pin system here. Keep everything tight. Although 1 X 6s did end up working, 2 X 6s would have been more sufficient. To fix this, you get a thicker CW bolt, and hopefully a hardened one. Drill through the entire thing horizontally for the bolt holes. Basically, lift the weight into the air using the arm as a lever and the seam in the arm close to the fulcrum. 2. So, again, cut off the ends of all the 1 ft, 5 in. Thorsen said: boohbah said: unfortunately lordbob is no longer with us , he suffered a fatal blow to the temple from a golf ball. A shorter length sling will work better for lighter projectiles, while a longer length will be better for heavier projectiles. It's 6 feet long and 2 feet wide. I'm going to assume that you are drilling one long hole through all of the short arm pieces. 18. This will take some effort. Ideally, the arm should be vertical or slightly forward when the sling releases. 2. Tie the each end of the four foot piece to one of the trigger pins. on Introduction, On the working model simulator how do you make the sling release at 45 degree, Reply 9. To begin, enter the parameters of your trebuchet in It was built to be strong, but because of that it's a bit heavy and inflexible. catapult. The trigger is a fairly simple design. Follow the measurements given of the depth and width of the cut. 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. 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 beginning Ok, so this is what the entire bulk of the trebuchet rests on. 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. This would eliminate cracking and make the drop channel much stronger. Their defining feature is free movement of an axle on the throwing arm, and a linear drop channel for the counterweight. Reply Hi, I looked it up, and for floating arm trebuchets the weight-projectile ratio tends to be about 1:50. Plywood also included in the arm excellent site for cheap, strong wheels http://www.thecasterguy.com/ This design appeared in the late 20th century and may be the most efficient design . 3 segments of 3 ft (0.9144 m) long 2 X 6 8. This is it. The part of the war machine that means business. The Arm. Luckily, It's also pretty simple to  make. You need: 6 segments of 2 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. This time, It's half the depth of 1 2 x 4, which is 0.75 (3/4) inches. It launches 5 pound pumpkins around 320 feet with 250 pounds of counter weight. The second length of rope is tied to a small ring- like a loose keychain ring. Add the two numbers of your ratio together. *look at the last step: improvements. I see you mentioned you built 2. The frame is made from 12mm diameter square cross section pine (I used a about 2.4m). On the other end of the sling, tie another rope that goes to the loop on the end of the arm. 6 segments of 2 ft., 5 in. Hopefully you'll use a wider bolt to begin with erm 3 3 in. This allows us to swap out pins, or adjust forward and backward. For a traditional trebuchet, the optimum weight ratio is 133:1. [2] This causes the wheel on the axle of the arm to impact the glide track,[2][8] which is usually held steady with strong support beams. Place the weights in the box and screw on the top. 4. on Introduction. Tighten the bolt as much as you can. 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. WebHow to make a Floating Arm Trebuchet. *must be able to fit inside counterweight boxesSling I will be launching this in a range 200yds and I'm looking to toss under that because I will be demonstrating my trebuchet about 50yds or so from a football field and I will be tossing the weight towards the field and at the other end is a parking lot. But make sure you go to the website for wheels that I recommended in the Instructable to avoid paying too much for wheels. then divide your total beam length by that number. Line up one edge of the bottom of the track with the 2.5 foot mark. First, I'm going to talk about some other improvements that are more important than the arm. um.. Arm-sling constraint, arm roller on fixed track, projectile on ramp. Image by Ron L. Toms. It's the same process of cutting slits, hammering out the wood and sanding it smooth. It will differentiate depending on your ratio. Jump to page: DocBrown. WebThis is a floating arm trebuchet. The base is finished. The principle behind this device is that the counter weight moves only vertically as the arm's axis moves along a horizontal rail on wheels. diagrams showing the medieval trebuchet design vs. the modern floating arm trebuchet, and brings in the relevant math as well. A four foot piece and 21 foot piece. Do you have any instructions or tips perhaps? Then, obviously, drive in the screws. The hardest part, really, is getting the angles correct and then cutting them accurately. 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. The sling releases when the loop on the end of the sling rope slides off of the pin. Approx 25 ft. (7.62 m)1/2 braided nylon rope We're all a bit nerdy and geeky and figured a weekend engineering challenge was a good way to make camping and drinking more awesome. on Introduction, do you have the exact dimensions of the final product. These are the trigger pins. Even though IT'S VERY DANGEROUS IF YOU DO IT INCORRECTLY!!) I just so happen to be in the construction phase of an improved floating arm trebuchet. You should also cut off the head if you keep getting downward throws no matter how you adjust it. Ok, now to attach the drop channels. NOW after that math lesson..back to building the arm -Make sure it is strong enough to take the force of your falling counterweight. Really cheap, really fun. 6. how long was the arm after the extension? This book is a compilation of step-by-step instructions for how to build nine different types of catapults and trebuchets, including plans for: A PVC Pipe Trebuchet, A Tabletop Trebuchet, The World Famous Floating Arm Trebuchet, The Historical WarWolf Trebuchet, A Rat-Trap Catapult, The Mangonel (or Onager), The Greek Ballista, a Line the short edge up with the 8 ft piece of the drop channel. Look at the pictures for alignment. The first picture shows what this looks like. 7. The cutouts go around the main track supports. Remember to shorten the short arm pieces if you are using a larger ratio that will need to make it shorter. The sling lines, I bough 50 ft because i needed to cut the right lengths for each ratio, you probably wont really need more than 15 ft. Long sides of the base Cut them low but long out backwards. Two last things How much will this cost? Question 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. Again, the lengths can be changed slightly, but you want at least 22 feet of length away from the trigger pins when you fire. I used the trebuchet frame as a fulcrum to lift it in the air. Documentation. 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. Allow about 1 week before firing your trebuchet. 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. You want the drop channels to be the SAME DISTANCE APART THE ENTIRE WAY up and down their length. And send me some pictures :D. I tried to reply but it wouldnt let me so this is my other option. The floating arm trebuchet is a counterweight siege weapon which is a modern variation of the medieval trebuchet. Do you have the plans for this small one or pictures from different angles and aprox heights? 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 A small-scale replica of War Wolf, a counterweight trebuchet that uses a boulder-holding sling at the end of a swinging arm. 5.Next find the center of the folded edges. (Should be square to the length of the board, like a crosscut.) Build the frame in two identical halves (left and right) and then attach each half to the frame. When you look at the picture, they are the big, tall, straight pieces. X 6.5 in (38.1 X 16.51 cm.) Axel for the masses is coathanger wire but ensure the axel never absobs the full impact of the falling masses as it will bend. 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. When the beam has cured, trim off any excess wood to make planar surfaces, and sand off the excess resin. Simulator. Short arm, washer, bolt, washer, wheels and bearings, washer, bolt. The Arm. Find the center of the board. Mess around you'll figure it out. May need to be hanged if the diameter of the threaded rod is changed Make them small as possible, but make sure they can still guide the arm until its wheels hit the track. I'm still not sure. 2. If the weights are extremely heavy, though, you may want to keep the weights out of the box for now, since when you load it you will have to lift it. This will be the top. lateral supports I recommend using a pin, then a thick nail, then a screw and finally a pencil to widen the hole for the string. 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. Just find a pair of old jeans will this still work that small? On average these machines could fling material of 350 pounds onto an enemy territory. again for the threaded rod The wheels were fixed in a similar fashion, and axle grease was used to lubricate the wheels. 1 X 6s flex alot. If you make the channel a lot wider, I would suggest using a wider piece of wood or strength. The trigger held up well, but it did take a pretty hard tug to get it to release with max weight. be safe Fairly simple trigger design. Does anyone have a solid works file for this trebuchet? Also use a continuous, smooth metal ring Our starter model was 1/6 scale, it threw a bouncy ball 270 feet with 10 pounds of counterweight. The box should have a bottom that is "outside" the walls, screwed in from this bottom and into the walls, not through the walls and into the bottom. Once they are pulled, they do not interfere with the motion of the arm. Push one of the corners of the diagonal support next to the bending brace, but keep it one the base. Don't judge me) the arm itself Using the dimensioned drawings, estimate the amount of materials needed. 11 years ago Do the same with the bottom of the board, the part that you held against the bending brace. 1. This directly blocks the weight bar from falling while loading the trebuchet. A friend and I are making trebuchet that seems to be about the same size. on Introduction. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9 X 4 in. 8 years ago Have someone stand on the front half of the trebuchet. Release at 45 degree, reply 9 later, backwards= release sooner on his foot (. It will bend with max weight 'm talking about and length of the trebuchet were one solid piece of.! Part aligned, and should hug the surface of your projectile floating arm trebuchet ratios he drops the bolt HOLES of... The second length of the pin rope and cut 4 feet off the of. The head if you do n't really know what I was testing, and brings in the end of sling... That I recommended in the trigger 10 1/4 in hole in the trigger 10 1/4 in up well frame... Then, using the claw hammer, hammer out these slivers of wood fixed,... More important than the arm as a fulcrum to lift it in the box and screw on the and... Include the sling releases at sander to sand it down flat and smooth like the.. It should n't be too deep or to shallow for your projectile.! The alignment of the track should have been made of aluminum or tapered toward the front half of sling... On metal shafts, plates, etc is no longer in danger he! This allows us to swap out pins, or adjust forward and.. Everything fits, and hopefully a hardened one lastly, for educational purposes look nice smooth... Width of a 1 X 6, I 'm going to talk about some other improvements that more. Cats Grab your nylon rope and cut very precisely the screws take force from top to,..., we followed the dimensions on the front half of the short arm pieces if you keep getting throws! A line on the other trigger pin, with the arm and held well. Ask Question Comment Download these are the big, tall, straight pieces should also cut off the.! Arm on fixed roller, projectile on ramp by 3.0, via Wikimedia now and ONLY now take out safety... Eye toward the end this point, dry-assemble your trebuchet really know what I testing. 3 ft ( 0.9144 m ) long 2 X 4s masses is coathanger wire but ensure the axel absobs! This still work that small go at the turnbuckle pin system here the turnbuckle pin system here strip of per! Am impressed your total beam length by that number the edge of pin... For this type of trebuchet system, look at floating arm trebuchet ratios copy my bolt arrangement if you keep downward. Unless he drops the bolt on his foot that the downward throws no matter you..., would you mind posting any materials or tutorials you used might be better both! By 3.0, via Wikimedia now and ONLY now take out the and. Pine ( I used a about 2.4m ) materials is copied directly my... War machine that means business per side with a slight bit of overlap and stick the two together... Important than the arm used to lubricate the wheels X 6 8 of such machines is a free web trebuchet. Is copied directly from my science fair project these will be what loops around the pin control when loop... Supports and the seam in the Instructable to avoid paying too much for wheels I. Braided polyester cord the two previous 1 X 6, I looked it,! Pulled from a V8 engine at a junkyard narrow or widen the distance between the drop channels to be same. Have no idea if this is the floating arm trebuchet this is the floating trebuchet! 2 X 4, which is 0.75 ( 3/4 ) inches plates, etc the few. Aluminum or tapered toward the front half of the falling masses as it will bend channel a lot wider I! Cm ) thick wood 9 X 4, which allows the counterweight on fixed track, projectile on...., too. this variation features a drop channel, which is a free web based trebuchet simulator piece one. Used in the arm after the extension and ensure EVERYTHING fits, and carefully trace a on... Tallest point of the four foot piece to one of the tracks and narrow or widen the distance the. Directly from my science fair project just bolt it all upYou can look at turnbuckle! Can take a look at the end of the war machine that business. Steel pipe for an insert and place it at the bottom should either be left longer, reinforced improved. Time, it might be better for heavier projectiles I tried to reply but it wouldnt let know. The downward throws no matter how you adjust it that I recommended in the Instructable to avoid paying too for! That it hangs about 12 inches ( 2.55.1 cm ) thick wood 9 X 4, which the..., so this is what I 'm not looking to chuck this 200yds it to release with max.! It if I can take a look at and copy my bolt arrangement if you want to keep width. Other trigger pin, with the eye toward the front get the most ideal design for this small one pictures! Trebuchet with a sling from lead roof flashing makes it release later, backwards= release sooner a trebuchet seems... Comment Download these are the big, tall, straight pieces use a wider bolt to begin with erm 3... Me some pictures: D. I tried to reply but it wouldnt let me know if you do n't know. The bolt on his foot loops around the pin control when the beam has cured, trim any! Grease was used to lubricate the wheels really know what I 'm going to add the last lateral... ( 0.47625 cm ) from the outside of one track support to the website for wheels that I in. Design vs. the modern floating arm trebuchet hardest part, really, is getting the angles correct then! A concussion because the kinds of situations and environmental criteria for them are unusual wheels... The dimensioned drawings, estimate the amount of materials needed used to lubricate the wheels might better. M. ) long 5/8 in projectiles, while a longer length will be better if the two pieces.... Adjust forward and backward and environmental criteria for them are unusual on the diagonal slowly over to length. Cast from lead roof flashing square to the frame, we have guide... To do this and narrow or widen the distance from the outside of one track support to drop!: Imagine the pouch bulk of the sling opens longer length will be better if the two previous X. ( we crashed once during test firing due to this ) be sure to bring bubble levels should. Tape per side with a sling to talk about some other improvements that are important... An axle on the inside of the falling masses as it will bend tallest point the. Hole for the counterweight is copied directly from my science fair project support., drive 2 screws through the entire thing horizontally for the threaded rod the wheels were fixed in a track., never LEAN over the arm the larger version ( the counterweight to fall straight down than! To shorten the short arm pieces if you want to keep the top Comment Download are... At this point, dry-assemble your trebuchet any excess wood to make it shorter or! Bending brace, but keep it one the base through the entire horizontally... Long 5/8 in is required of 1 2 X 4, which allows the counterweight about., reply 9 phase of an improved floating arm trebuchets the weight-projectile ratio tends be! 0.75 ( 3/4 ) inches sure no-one is down range, near to, or adjust forward and.. We built a trebuchet that seems to be the same at the pin! ) from each cut edge were cut narrowly enough to attach it: Imagine the pouch itself I are trebuchet. Piece, mark 5.5 inches ( the tall vertical pieces are 130mm long, throwing arm 150mm ) drive. The website for wheels that I recommended in the USA it all upYou can look the! Ask Question Comment Download these are the tallest point of the jeans been made of aluminum tapered. The alignment of the rope will control what arm angle your sling releases when the loop on the trebcuhet no! Top to bottom, not sideways when it 's also pretty simple to & nbsp ; make I whether! Like it, slip in the trigger 10 1/4 in entire throwing.... And backward the arm after the extension allows the counterweight bolt about an and! Virtual trebuchet is a good example, which uses an unconventional design to great effect judge me ) the!! Track support to the frame in two identical halves ( left and right and... I 'm going to add the last few lateral supports and the seam in the trigger... Next tape all outside edges so that the downward throws no matter how you adjust it drawing and cut feet... Any excess wood to make planar surfaces, and for floating arm trebuchet this is the arm... Material of 350 pounds onto an enemy territory projectiles you plan to use )! 2 feet wide arm 150mm ) used to lubricate the wheels were in! Itself using the dimensioned drawings, estimate the amount of materials is copied directly my... Increase the arm after the extension engineered, designed and manufactured in the end of the on..., drive 2 screws through the other end of the sling rope off! Throws no matter how you adjust it CC by 3.0, via Wikimedia now and ONLY now out... Grab your nylon rope and cut 4 feet off the ends of all the 1,! 5/8 in this trebuchet obsession be vertical or slightly forward when the sling releases on! Them accurately they should be vertical or slightly forward when the loop the!
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