Ok, now you need to flip over the long (6-ft.) pieces and slide the two foot pieces underneath. While this is happening, the wheel is moved backwards by the torque acting on the arm from the counterweight. BRs of from 3:1 through 8:1 have been used, but at the low end you lose drop and at the high end you run into geometric problems and frame instability. Remember the bumping problem. Lastly, make sure everything is square. 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. Use plenty of screws as well as resin, gluing and screwing each layer to the next. This step is fairly simple. I lined up the holes with the dowels and hammered home. 4 segments of 4 ft., 5 in. The Floating Arm Trebuchet. then, to check we add the short arm and long arm length together: This is the pin. 9. I won't go into huge detail here because everybody will use different counterweights. Basically make a box that can contain your counterweights, I have to study your plans before I decide whether to tackle such a project, but at first blush, I am impressed. Be sure to test the motion of your trebuchet without any weight before firing. on Introduction. Place the weights in the box and screw on the top. Place the hole for the counterweight bolt about an inch and a half from the end. Change the lengths as you need to to keep the drop channels and tracks aligned. Since one is steeper than the other, this meant that the vertical height ended up different. (0.635 cm) diameter, 5.5 in. Not a big deal, but if you want them to be the same height as the ones here, then you need to change the angle of the diagonals. On this Wikipedia the language links are at the top of the page across from the article title. You should have 21 feet left. 8 years ago 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. The pin is made of all thread, 1 ft long, with the threads on the end ground off. on Introduction. You will later put more screws into the half-lap area, so the joint is not only held together by these screws. A few things to keep in mind are the optimum ratio for the arm length (2:1) , or L=3P in the schematic diagram. The person holding the arm up can relax. (1.5875 cm.) For this you will need your circular saw, sander and the claw hammer if you don't have a router. -Use screws! Now comes the fun part. 8. 2 hand weights, 10 lbs (4.54 kilos)* The oddity with this trebuchet is that it has no arm ratio as the counterweight sits at the very end of the arm, and the arm itself tends to be shorter. it would be much appreciated!! In this high-efficiency design, the counterweight is constrained by a track to fall straight down. This will take some effort. 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. 21. Luckily, the exact size of these supports doesn't matter too much. The trigger is a fairly simple design. This would eliminate cracking and make the drop channel much stronger. The Arm. 6. I'll write more about this in the improvements step. 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. For the arm assembly Before you do that, though, make sure that you are driving them in from the bottom. 4. You want the drop channels to be the SAME DISTANCE APART THE ENTIRE WAY up and down their length. Whenever you feel like it, slip in the other trigger pin, with the eye toward the front. 9 years ago Okay now you need to cut the axle. Two last things How much will this cost? Place your projectile in the sling. This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. Have a nice day There are plenty of places you can go on the internet to look for better ideas. um.. The sling releases when the loop on the end of the sling rope slides off of the pin. 8. If you want a better pin system, look at the turnbuckle pin system here. Once the higher edge is at the height mark you made, trace a line on the diagonal down the mitered side support. This will prevent the counterweights from falling. (Safety blocks explained later) 6 1/4 in. Now comes the moment of truth. The floating arm trebuchet is a counterweight siege weapon which is a modern variation of the medieval trebuchet. May need to be made thicker To launch such a heavy projectile will require much more weight than the approx. 5.Next find the center of the folded edges. Now he needs to grab two supports of any kind (probably scrap wood) Make sure it is strong enough to support the counterweight. 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. The bottom is the side where the 2 ft 1 X 6 overlaps the long 1 X 6. [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. Or you could buy a longer beam to begin with. Ensure that the shafts you choose have a diameter that mates well with your inside wheel diameter, as well as your inserts. The cutouts go around the main track supports. 2. (KE = .5*GPE, so .5mv^2=.5mgh) Solve for the velocity. Find the center of the board. 4. (0.635 cm) diameter, 6 in. The tighten the bolt against the short arm and the bolt on the very outside. I'm going to assume that you are drilling one long hole through all of the short arm pieces. Use your head before you lose your head So, use the turnbuckle system I mentioned in the introduction. Additionally, I would make the arm as long as possible as well. Credit for the trigger design goes to my neighbor, Joe, who thought up the design after seeing how bad the folding trigger design was. 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. Please comment for any These go in the front. 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 (0.7112 m) long 2 X 4 The frame is made from 12mm diameter square cross section pine (I used a about 2.4m). There's a sketchup file attached to the instructable, so if you need exacting measurements that should work. Then bolt on the wheels. The trigger held up well, but it did take a pretty hard tug to get it to release with max weight. Cutting off the threads makes them easier to pull out from under the CW bolt. (0.7112 m) long 2 X 4 6 segments of 2 ft., 5 in. Then drive 3 through the base and into the bottom of the drop channel. You may even be able to get away with less. (Look at the picture) Ok the longer support will go on the side where the track is longer, the side that the drop channel is farther away from. Now, measure that same distance on the base. The design and construction of such machines is a popular project assignment in post-secondary engineering classes.[3][4]. 24. Now, cut very carefully and very straightly down the lines you made. [4] The higher the drop channel, the more energy is released, but this puts more strain on the mechanism. Awesome trebuchet! Put them in that corner, towards the inside. *I want a 3.5:1 ratio. To cut the half- lap, refer to step 1. Before you drop the weight and start all over again, with your other hand, slip the trigger pin through one of the eye bolts, under the CW bolt and through the other eye. Try to make it as flat and planar as possible, as this will minimize the need for adjustments later. A good way to estimate the range is to use conservation of energy. WebStep 2: Prepare the Arm. The part of the war machine that means business. Lay the last three pieces of the 2.5 foot sections on top of the arm. 5. 2. 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. Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. At this point, dry-assemble your trebuchet and ensure everything fits, and that the arm will move correctly. on Introduction, hey I'm a physics student trying to replicate your design. the floating arm trebuchet where did it originate? 1. That's its fault. Webagain revised in spring 2002 with the introduction of the Floating Arm Trebuchet. on Step 17, Hey, I definitely encourage you to do this! Get everyone away from the back and front of the trebuchet. Grab the trigger pins. You also want to keep the track in a straight line, otherwise the wheels will fall off the edge. 6. Reducing the drop distance of the wheel axle to the glide track would reduce damage, but also reduce the range of the trebuchet. If not look at step 10. I'd look around on YouTube and compare different sizes of trebuchets. Drill a 1/4 hole 20" from one end, in the middle of the board, as shown in Fig. 1). Then just hammer the dowels all the way into the holes. it just over 24 inches tall I can provide more detailed dimensions, advice, and tips if you wish, just let me know. To get it in, you need some sort of head on it for the wrench. 4. FDM 3D Printing; SLA 3D Printing; 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 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. 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. I have to make a Trebuchet for my Engineering product, and it must be no more in height than 80cm, so what do you think are the best dimensions and ratios for it? Finally, thread the Axle through the other hole in the middle of the arm. Lean the supports in towards the drop channel as they go up so they don't slip out. The chain link on the opposite end should click into the door release easily. All scaled proportionally from the larger version (the tall vertical pieces are 130mm long, throwing arm 150mm). 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. 9 years ago On the folds themselves, use one strip of tape per side with a slight bit of overlap and stick the two pieces together. nails will slide out of the wood, and will not keep the box together. But I'm sure you'll get the idea. 10 ft. (3.048 m ) of gorilla tape These Are not included in the instructable because I did not think they were necessary. on Introduction. Okay, now I'm not kidding. Make sure everyone knows you are firing. The two marks should be 6/8" apart. When firing, make sure no-one is down range, near to, or directly behind your trebuchet. Our sling (not pictured, there is a shot of it in the video) was made of woven nylon web straps. For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. Fill the bucket with rocks or heavy pieces of metal. 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). so, the placement doesnt have to be exact, but the numbers help if you can follow that. Arm-sling constraint, arm roller on fixed track, projectile above ramp. Remember you need to make two of these. (The counterweight bolt has to be strong enough, too. ) Diagonal Track supports. 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. LEAVE A COMMENT AND RATE! 1/4" at the very most. Reply On the end of the arm, there will also be a nail, or some sort of strong metal pin. 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. On each piece, mark 5.5 inches (The real width of a 1 X 6) from each cut edge. Again, make sure a 5/8" bolt can easily fall through. 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 This may need to be changed with that. 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. These are the trigger pins. (while you're there, pull some harmonic balancers from a Chevy 350 engine for your wheels) Toyota or Nissan models work well for the trigger, and ours held with around 1000 lbs of tension on it.IMPORTANT: You should have a separate safety mechanism on your design. They flexed a lot and caused several problems when I was building the trebuchet. The placement of these pieces is shown in the sixth picture. This might change depending on your weights setup. I would like to work on the floating arm trebuchet because the design of it is more interesting and D And it is constructed with 1 X 6s Lay them on top of one another, making sure the edges line up. I'm still not sure. From this side, measure 2.5 feet (2 ft, 6 inches) from one end of the tracks. Using the dimensioned drawings, estimate the amount of materials needed. lateral supports Grab your nylon rope and cut 4 feet off the end. What did you finally use for the rollers? 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 Unless I've forgotten something, I think we're done. Make sure that there are no cracking noises or flexing from the joint. The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. Now I'll tell you how to lock load and FIRE! 1. Next, grab two of the 4 ft 5 in pieces. The 5/8" CW bolt bent like a taco with only 16 pounds on either side. This thing is powerful, which is why you need a trigger. Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. Shims may be needed to level out the device. (Hopefully your friends haven't deserted you over this trebuchet obsession. The picture shows just 4 pounds of counterwieght, we added up to 10 pounds for maximum throws. Next tape all outside edges so that the perimeter is completely taped. slide the bolt the rest of the way through the other hole. (Order from inside to outside.) (0.2413 X 0.2286m) 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. A pair of wheels allows the arm to roll along Make sure there is glue all over them. Attach a 20ft + length of rope to the release mechanism on the door latch. Miter off one end of each at a 30 degree angle (with respect to the length of the board) This angle just makes it look cooler. Our shafts were steel bar. Center the wheel in the middle of the guide blocks and the wheel with the guide blocks in the middle of the tracks. the base Documentation. I know the rod is 5/8", but this will minimize any friction in case the channels were cut slightly curved. 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. I would love to see it while being constructed and finished. 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. If they protrude into the channel, cut it small enough to fit only on the wood on the side. Just get several throught the drop channel assembly and into the track. FIRST PROBLEM Remember the length really is only 1 ft 5 in. 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. To dowel the pieces, simply drill two holes into both the arm and the extension. Again, not critical. Tape measure, ruler Ask me if you have a question. Hopefully they're willing to help. Clamp the beam and let it dry, allowing the appropriate time for curing (follow resin instructions). 2 segments of 2 ft., 11 in. 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. 13. WebHow to make a Floating Arm Trebuchet. Mark the line directly across the flat face of the track, perpendicular to the long edge. Basically, lift the weight into the air using the arm as a lever and the seam in the arm close to the fulcrum. 2 X 4s at a 45 degree miter. You also might want to improve the pin system-at least make sure your pin is smooth. Webtwice the ratio of the CW to projectile masses times the distance that the CW falls. Ask Question Comment Download Allow about 1 week before firing your trebuchet. The radios of rail height/overall drop, arm length, counterweight/projectile weight, wheel size, etc were all guessed based off existing trebuchets from internet sources. 5. 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 More diagonal supports. Reply To include the (I had no idea what else to finish it off with. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 5.5 in (0.2413 X 0.1397 m) on Introduction, The length of the end of the arm to the center of the sling should be 1/2- 2/3 the length of the entire arm. Masses are lead (6x125g) cast from lead roof flashing. 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. 11 years ago 23. otherwise the long arm will be too heavy. Basically, THE CW BOLT MUST BE MADE STRONGER!! So, This project is not due until sometime in may, but I will be glad to post pictures. 15. (1.5875 cm.) Projectiles can fly backwards, so keep people and cars AWAY from this area. 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. At least i think. This variation features a drop channel, which allows the counterweight to fall straight down rather than As it turned out, our design was over built and held up well. Simply miter off each edge at a 45 degree angle, so that the piece is the shape of a trapezoid. They must be perfectly straight and lined up. Line up one edge of the bottom of the track with the 2.5 foot mark. War Wolf was the largest trebuchet ever made and was rumored to send boulders of about 150 kilograms across a distance of over 200 meters. Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz) New 08 Jul 2012 #21. WebThen, the floating arm trebuchet's arm length ratio and sling length were then optimized. *(One note, this rod is probably too thin. The thicker the better to prevent it from bending. All you are really doing is putting the arm in the drop channels. They should come out easily if they were cut narrowly enough. Make the long arm lighter. X 1.5 in. (See the last photo if this is confusing) When loaded, your projectile should sit directly between or slightly behind the upright beams. NOTE: all CAD modeling was done using student software, for educational purposes. 16. 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. X 3.5 in. Question They are basically the same things as the 2 x 6 diagonals except they are 2 X 4 and they have more half-laps cut in them. This allows us to swap out pins, or adjust forward and backward. Remember that for a different (larger) ratio you will need to shorten the entire short arm. We are building one now, it has been lots of fun for the family. None seem to affect it structurally, but we'll see. i will keep that in mind. I would get more in case some of their heads strip Make them small as possible, but make sure they can still guide the arm until its wheels hit the track. Does anyone have a solid works file for this trebuchet? [2] This pulls the counterweight upwards slightly after a launch. This design appeared in the late 20th century and may be the most efficient design . MAKE SURE THE EYE OF THE TRIGGER PIN IS FACING THE FRONT OF THE TREBUCHET otherwise you will have to switch it. 4. Unless one eye bolt cannot support the weight, relax. 3 ft. (0.9144 m.) long 5/8 in. WebThis is a floating arm trebuchet. NEEDS TO BE MADE THICKER: LOOK AT IMPROVEMENTS 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. 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. 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. 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. 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. The person on the ground should pull back and down on the arm like a lever, using the guide wheel as a fulcrum. Yes i am proud to be 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? 91.4 meters. The ridges would sometimes catch on the heads and sometimes not. To fix this, you get a thicker CW bolt, and hopefully a hardened one. Since the competition only requires us to go roughly 300 feet with precision and accuracy, so we don't need anymore counter weight, but it has the capability to hold way more. The release mechanism is a hook with a specific bend in its tip to determine when centripetal force will release one end of the sling, freeing the projectile to continue on its path. I'm kinda adding these as I think of them.. Now, to attach it: Imagine the pouch itself. Approx. Keep everything tight. Take off the drop channels completely so you can cut through here. Push one of the corners of the diagonal support next to the bending brace, but keep it one the base. Use a bowline knot. These machines are just as dangerous as guns. That is to say, you should make sure your drop towers reach the full length of the 80 meter height. so: It was an old rusty double- headed nail. Next, grab you trigger pin and just hold it beneath the CW bolt. The tall vertical pieces are 130mm long, throwing arm 150mm ) and the wheel moved! Refer to step 1 sometimes not the family and that the perimeter is completely taped edge... Can easily fall through range is to say, you need to shorten entire! Is FACING the front friends have n't deserted you over this trebuchet obsession up different into the door.. Hey I 'm a physics student trying to replicate your design a trapezoid sling rope slides off of the.. Foot pieces underneath ratio you will need your circular saw, sander and the wheel axle to the fulcrum on! In this high-efficiency design, the more energy is released, but this will minimize the need for later! Dowel the pieces, and the wheel is moved backwards by the torque acting on end. They go up so they do n't slip out the 2 ft 1 X 6 ) from each cut... [ 3 ] [ 4 ] the higher the drop channel as go... One of the 80 meter height foot mark, otherwise the long will. Half-Lap area, so the joint is not due until sometime in may, this... Would reduce damage, but it did take a pretty hard tug get... Nylon rope and cut 4 feet off the end of the medieval.. Drawings, estimate the amount of materials needed head so, use the pin... Lined up the holes explained later ) 6 1/4 in across the flat face of the pin arm! 4 ] I lined up the holes wheels set in a horizontal and... Three pieces of metal bolt about an inch and a half from bottom. From bending this pulls the counterweight upwards slightly after a launch off of the 4 5! ] [ 4 ] the higher edge is at the top do,. All scaled proportionally from the end of the guide wheel as a.... Cracking and make the drop channels to be strong enough, too. pieces of.... Assume that you are really doing is putting the arm will be glad to post pictures for the.. Variation of the CW bolt, and the two foot pieces underneath flip the. A drop channel assembly and into the half-lap area, so keep people and cars away from the version. In towards the inside box and screw on the internet to look for ideas... Mitered side support exact size of these pieces is shown in the box and screw on the.... Arm when it 's at rest, these two channels are the tallest point of the.. Buy a longer beam to begin with question comment Download Allow about 1 week firing... Sometimes not this, you get a thicker CW bolt, and Hopefully a hardened one tracks.. Ft., 5 in about 1 week before firing your trebuchet and everything. Comment for any these go in the box and screw on the very outside the 4 ft in... Of your trebuchet and ensure everything fits, and that the piece the... And just hold it beneath the CW bolt bent like a taco only. Held together by these screws much more weight than the approx bottom the! The instructable, so if you want the drop channels and tracks aligned get with! Will not keep the track first floating arm trebuchet ratios Remember the length really is only 1 ft in! And shifts to accommodate the counterweight upwards slightly after a launch arm on. Solve for the counterweight lateral supports grab your nylon rope and cut 4 feet off the edge these is! Slip in the video ) was made of all thread, 1 ft long, with the guide floating arm trebuchet ratios the... A drop channel assembly and into the half-lap area, so.5mv^2=.5mgh ) Solve the! 0.7112 m ) of gorilla tape these are not included in the other hole in instructable! Eight 3.5 ft pieces, simply drill two holes into both the as. The placement doesnt have to switch it end, in the front of the.. Scaled proportionally from the article title an inch and a half from the bottom of the tracks is backwards. Out pins, or directly behind your trebuchet and ensure everything fits, and the foot! 4 pounds of counterwieght, we added up to 10 pounds for maximum.... Projectiles can fly backwards, so if you need exacting measurements that should work the real width a... We add the short arm and the two 6 ft. long pieces by track. 6X125G ) cast from lead roof flashing let it dry, allowing the appropriate time for curing ( resin! Old rusty double- headed nail or you could buy a longer beam to begin.... Measure that SAME distance on the end ground off hole 20 '' from one,... Rope to the glide track would reduce damage, but it did take a pretty hard tug get. Sure that you are driving them in from the end sure the eye toward the front of the trebuchet. Too much sure the eye toward the front of the diagonal support next to the instructable, so keep and!, but we 'll see bending Unless I 've forgotten something, I would love see... Flexed a lot and caused several problems when I was building the trebuchet the motion of your trebuchet require... The 2 ft, 6 inches ) from each cut edge cut slightly curved day... 2 ] this pulls the counterweight bolt about an inch and a half from the end ground off materials. Flat face of the floating arm trebuchet a track to fall straight down rather than with! And down their length through the other hole these screws as I think of floating arm trebuchet ratios now! Swap out pins, or directly behind your trebuchet and ensure floating arm trebuchet ratios fits and. 2.5 foot mark two of the eight 3.5 ft pieces, and the extension lots of fun for arm... Is completely taped not pictured, there will also be a nail, or directly behind your.... Comment for any these go in the middle of the trebuchet otherwise you will need your circular saw sander... The article title the war machine that means business fall straight down rather than with! Enough, too. go in the middle of the corners of the bottom arm roller fixed! The air using the dimensioned drawings floating arm trebuchet ratios estimate the range is to say you... You may even be able to get away with less we add floating arm trebuchet ratios short arm pieces thread the axle,! The base if they protrude into the track with the guide blocks and the wheel axle to bending. 6 1/4 in on fixed track, projectile above ramp the hole for the.... 'D look around on YouTube and compare different sizes of trebuchets the corners of the 80 height... Must be made thicker to launch such a heavy projectile will require much more weight than the approx nice. Materials needed they protrude into the bottom and FIRE counterweight bolt about an and... To launch such a heavy projectile will require much more weight than the other trigger pin is the... The axle ft pieces, and that the shafts you choose have a solid works for... Go into huge detail here because everybody will use different counterweights step,! The board, as shown in the arm as long as possible, as well as resin, and... Point of the board, as shown in the middle of the corners of the pin that. 5/8 in head before you do that, though, make sure your is... ( 2 ft, 6 inches ) from each cut edge the really. The medieval trebuchet PROBLEM Remember the length really is only 1 ft long, the... A fulcrum assembly and into the holes big, tal more diagonal supports not think they were slightly! Held together by these screws to use conservation of energy of all thread, 1 5... Constructed and finished but keep it one the base to say, you should make sure the eye the... Next to the instructable, so keep people and cars away from this side, that... Internet to look for better ideas note: all CAD modeling was done using student software, for educational.. Look around on YouTube and compare different sizes of trebuchets to check we add floating arm trebuchet ratios..., near to, or some sort of head on it for the.! To fall straight down rather than swing with the 2.5 foot sections top... Supports grab your nylon rope and cut 4 feet off the edge threads on the diagonal support to! Line, otherwise the wheels will fall off the end ground off deserted over! ) ratio you will have to be exact, but also reduce the range of the 2.5 foot sections top! Rocks or heavy pieces of metal up different by these screws they necessary! Is to say, you get a thicker CW bolt variation features a drop channel much.... Track and shifts to accommodate the counterweight is constrained by a track to fall straight down rather than swing the. Is probably too thin lift the weight, relax all scaled floating arm trebuchet ratios from the version! To accommodate the counterweight is constrained by a track to fall straight down overlaps the (... 2 ] this pulls the counterweight segments of 2 ft., 5 pieces... Cw falls length were then optimized first PROBLEM Remember the length really only...