This is what fit for me. On each piece, mark 5.5 inches (The real width of a 1 X 6) from each cut edge. Record the next shot if the first one does not go well. This way, it's easy to angle the board to get angled shots. *I want a 3.5:1 ratio. This will be the top. (2.54 cm.) The arm is split into two parts by the fulcrum. Arm-sling constraint, arm roller on fixed track, projectile on ramp. Basically, put them in the corner where the main track supports and the track meet. 4. WebA floating arm trebuchet's arm is mounted on wheels that roll on a track parallel to the ground, with a counterweight that falls vertically, allowing for greater efficiency by increasing the proportion of energy transferred to the projectile. I just so happen to be in the construction phase of an improved floating arm trebuchet. 2 segments of 2 ft. (0.6096 m.) long 5/8 in. i will keep that in mind. Use your head before you lose your head This still does not include the 2 X 6 pieces or any other pieces of plywood. these are the trigger pins 8. There's a sketchup file attached to the instructable, so if you need exacting measurements that should work. I know the rod is 5/8", but this will minimize any friction in case the channels were cut slightly curved. thick plywood, 2 ft., 5 in. The guide blocks can be any shape you want, but look at the picture notes below for shaping. With the help of the Siano paper we were able to engineer a very effective machine. The CW boxes tilted, and would rub on the drop channel when it dropped. (1.5875 cm.) So, cut the first twisting brace, on the very front, as wide or narrow as you need it to keep the drop channels straight. Yes, I decided to add this step after awhile. Again, the lengths can be changed slightly, but you want at least 22 feet of length away from the trigger pins when you fire. It's been 4 years since I built this in 8th grade (graduated high school by now), but its still lots of fun to set up and launch! I 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? If you have a router, it would be easier to do this by just cutting away the material. Flexing will be reduced and you will have a stronger base to work with. 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. It takes awhile to calibrate the different lengths and ratios to reach optimal firing capabilities. And back up at least 20 feet when firing (The sides are safest) (third picture on the right) RLT industries trebuchet.com Remember, even if you drop the CW, the safety blocks will prevent the arm from swinging up. Punch the holes centered as shown and directly on either side of the seam. The picture shows just 4 pounds of counterwieght, we added up to 10 pounds for maximum throws. I forget what you are supposed to do next You may even be able to get away with less. 2. Tie the longer end of the rope through the hole in the end of the arm. (0.635 cm) diameter, 5.5 in. I don't really know what I'm talking about. [2] The arm then jerks forward and releases the projectile from the sling. (Hopefully your friends haven't deserted you over this trebuchet obsession. 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 If you need any more help feel free to let me know, and it would be great to see a picture of the final thing. Line up one edge of the bottom of the track with the 2.5 foot mark. As a starting point, cut these two 1 segment of 7 ft. long 2 X 4 However, if you want your arm to be longer, just buy this piece longer. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 9 in. Need some advice please. NEVER, NEVER LEAN OVER THE ARM!!! 13. Hey I just made that up right now. They should come out easily if they were cut narrowly enough. i need to make mine 3x3x3. 3 3 in. ), but I came up with distances reasonably close to the actual performance. Next, grab you trigger pin and just hold it beneath the CW bolt. This will stop fraying and make it more solid. Just find a pair of old jeans First, grab two of the 8 foot long pieces. 3 ft. (0.9144 m.) long 5/8 in. Try to have all the sizes of your shafts and designs for your trigger and sling release figured out at this stage, as well as how you plan to attach the shafts (welds or flanges, etc). The first recorded use of traction trebuchets appeared in ancient China and were probably used by the Mohists ps-mohist are a scientific lead version of the chinese What is the floating arm Trebuchet, and how does it work? 6 1/4 in. A note about the guide blocks: If you see or hear bumping, look carefully at this back area w/ a video camera or just your eyes to see why it's doing that. 6. 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. When the beam has cured, trim off any excess wood to make planar surfaces, and sand off the excess resin. excellent site for cheap, strong wheels http://www.thecasterguy.com/ Remember that for a different (larger) ratio you will need to shorten the entire short arm. Do you have the plans for this small one or pictures from different angles and aprox heights? After looking at the dozens of picture I took, It should be pretty easy to figure out how to put everything together. The longer side is responsible for throwing, acceleration quickly due to the dropping weights. Here, we followed the dimensions on the drawing and cut very precisely. Advertisement By: Nathan Chandler Floating bridges are uncommon in large part because the kinds of situations and environmental criteria for them are unusual. simplest step. I'm going to assume that you are drilling one long hole through all of the short arm pieces. Mark the line directly across the flat face of the track, perpendicular to the long edge. This will be the finger end of the arm. The person on the ground should pull back and down on the arm like a lever, using the guide wheel as a fulcrum. I attached the arm extension to the rest of the arm with some wood pices, dowels and some leftover aluminum channeling. Otherwise, The arm will get puched over and on top of them, slowing down the arm a lot. This directly blocks the weight bar from falling while loading the trebuchet. None seem to affect it structurally, but we'll see. Next, going to the back of the frame, we have the guide wheel and the guide blocks. 8 matching cut washers You need to lift the counterweight to the height of the supports so your friend can get them just underneath the CW bar. WebFloating Arm Trebuchet - Hobbyist Version The F.A.T. The wheels were fixed in a similar fashion, and axle grease was used to lubricate the wheels. The two bits at the open top of the cut channel..keeps the drop channel from "opening" 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? It cost me about $130 not including the weights. In contrast, a floating arm trebuchet features an axle on the arm freely moving along a horizontal glide track. It launches 5 pound pumpkins around 320 feet with 250 pounds of counter weight. On average these machines could fling material of 350 pounds onto an enemy territory. Because we are about to cut the tracks in half. I would like to work on the floating arm trebuchet because the design of it is more interesting and D on Step 17, Hey, I definitely encourage you to do this! Do some experiments, that part is the most fun. On the fraying edges, use only one strip and fold it over. .and several of the bolts for the 5/8" threaded rod. WebThis is a floating arm trebuchet. -Make sure it is strong enough to take the force of your falling counterweight. Really cool project Brother, thanks for putting together a great instructable. The bottom is the side where the 2 ft 1 X 6 overlaps the long 1 X 6. 6. Credit for the trigger design goes to my neighbor, Joe, who thought up the design after seeing how bad the folding trigger design was. It may take you a few tries, so cut carefully an take small amounts of wood off, checking the angle after each cut so you don't overcut it. 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. Try to make it as flat and planar as possible, as this will minimize the need for adjustments later. Build a good study base using 2x4 and plywood. The pinis crap. I don't remember the exact dimensions, but I think it was a little bit taller than 8 feet, and about 6 feet long. Center the wheel in the middle of the guide blocks and the wheel with the guide blocks in the middle of the tracks. For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. 7 4.5= about 1.6 That should be about 2 inches from the end of the track. Then just screw the bolt through when you need to. 9 years ago For them to fit, I had to cut different lengths off of the diagonal supports. So we built a 10 throwing arm trebuchet. If the shot releases at the wrong time, adjust the pin angle. Clamp the beam and let it dry, allowing the appropriate time for curing (follow resin instructions). long carriage bolts 10 1/4 in. (Look at the picture) Friction when the counterweight is dropping down to the glide strike can be reduced by using silicone grease or a thin film of plastic on the drop channel. The trebuchet, as is, would probably not be able to launch such a heavy projectile, but I'm not sure. The Floating Arm Trebuchet The trebuchet is a medieval gravity powered engine of siege warfare designed to hurl a projectile, such as a heavy stone or a diseased animal, at a distant target such as castles. rubber mallet Arm-sling constraint, arm on fixed roller, projectile above ramp. I have no clue what it is for f2k, but it is a more efficient trebuchet. To reset the device, the counterweight must be raised back to the original height and locked in with the trigger mechanism. 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.. 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. these will be used in the trigger 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 He was right. You may want to keep the weights out while you are doing this. This is only to coutersink the screws, do not drill the hole all the way through. You will later put more screws into the half-lap area, so the joint is not only held together by these screws. It's 6 feet long and 2 feet wide. Then very carefully you will have to put in the safety blocks again and reset the trigger. May need to be made thicker NEEDS TO BE MADE THICKER: LOOK AT IMPROVEMENTS and if everyone wants the step I'll add it. Finally, thread the Axle through the other hole in the middle of the arm. (0.7112 m) long 2 X 4 these are the trigger pinsWheels, weights This is it. There's tons of assumptions involved there (what's the drag coefficient of a pumpkin? The angle and length of the pin control when the sling opens. The second length of rope is tied to a small ring- like a loose keychain ring. Make sure everyone knows you are firing. Twisting braces ? 7. denim fabric 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's smoother, faster, and prevents grooves from wearing in the wood. I have to study your plans before I decide whether to tackle such a project, but at first blush, I am impressed. I really appreciate your work in building this instructable. Then just hammer the dowels all the way into the holes. *look at the last step: improvements. 6 1/4 in. Lay them on top of one another, making sure the edges line up. A mortise and tenon joint would have also probably worked. Here are some stats, note that these apply to the original #2 treb. [2] The eye bolts are usually placed at the bottom of the frame, locking above the arm to prevent accidental release. Circuits | Floating Arm Trebuchet : 7 Steps (with Pictures) - Instructables So, if you want them to be the same height, you may need to change the angles or the lengths mentioned here. Take off the drop channels completely so you can cut through here. jk. Again, cutting these pieces shorter will narrow the track and cutting them longer will widen it. The sling releases when the loop on the end of the sling rope slides off of the pin. 4 years ago. Have a nice day I won't go into huge detail here because everybody will use different counterweights. We used these to hold the weight bar in place, with small plates welded to them to keep the weight bar from sliding back and forth. 4. They would extend outward, just like the board chute. If you wanted to simply use a board, it might be good to attach two long pieces of wood to the length of the board. I'm sure this pouch design could be improved. (The counterweight bolt has to be strong enough, too. ) Place the tips of these boards 1 foot from the end with the tiny rectangle of wood. SECOND PROBLEM thank you, Reply Drill the holes for the eye bolts. Socket wrench for your threaded rod Two last things How much will this cost? Cut a piece of steel pipe for an insert and place it at the center of each form, then pour the concrete. multilingual. 1 segment of 7 ft. long 2 X 4 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. These machines are just as dangerous as guns. Reducing the drop distance of the wheel axle to the glide track would reduce damage, but also reduce the range of the trebuchet. Hopefully they're willing to help. Put them in that corner, towards the inside. [3] If you claw hammer Without one of them , the arm would simply fall into the ground. 23. From this side, measure 2.5 feet (2 ft, 6 inches) from one end of the tracks. This way, the screws take force from top to bottom, not sideways. the next 3 specifically show the dimensions for the short side. It shouldn't be too deep or to shallow for your projectile, and should hug the surface of your projectile well. 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. While this is happening, the wheel is moved backwards by the torque acting on the arm from the counterweight. Our weights were 18" diameter and 4" thick, weighing 80-90 lbs each. They are fairly simple to make. lateral supports (0.635 cm) washers, matching carriage bolts 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. You will need the denim and the monkey- no, sorry, gorilla tape. then divide your total beam length by that number. Line up the pieces of plywood and drill holes through everything for the carriage bolts. Right now, I'm trying 3/4", but I'm still fixing the trebuchet and haven't tested it yet. I would still recommend doing one, though. 2 segments of 2 ft. (0.6096 m) long 2 X 4 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. Just cut a length of 2 X 4 To fit in the spots shown in the pictures. The length of the rope will control what arm angle your sling releases at. Our sling (not pictured, there is a shot of it in the video) was made of woven nylon web straps. Although later there are more. So, This project is not due until sometime in may, but I will be glad to post pictures. WebSmall floating arm trebuchet plans. They should be about 2.5 feet tall. Basically all I'm trying to tell you is: drill one hole with a drill press with a long enough drill bit through all of the boards of the short arm at once. 2 segments of 6 ft., 2 in. The classic beam ratio for a FAT is 2:1. I might include them later. WebLaser Cut Desktop Trebuchet. Follow the measurements given of the depth and width of the cut. How would this work at half the size? In this high-efficiency design, the counterweight is constrained by a track to fall straight down. (0.635 cm) bolts, matching thread Beside the arm when it's at rest, these two channels are the tallest point of the trebuchet. The trigger pins keep the weight from falling. 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 8 segments of 3 ft., 6 in (1.0668 m) long 2 X 4 jigsaw the one I used here Make sure the gap is aligned with the supports and the gap in the drop channels. On the arm, drill a hole for an eye bolt, and use a washer on both ends. We just built an hinged counterweight trebuchet for our annual group camp of friends from highschool (we're all in our 30s now.). That model was equipped with a folding gantry and pulley system to raise the counterweight, with that it could be fired every 2 minutes. Floating Arm Trebuchet Page 3 of 3 First 1 2 3. 1. 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. 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. And lastly, for the extra supports, we have the lateral diagonal supports. 7. simplest step. grab the last 3 ft, 6 in 2 X 4s. Line the short edge up with the 8 ft piece of the drop channel. They have the same orientation a anyways, the trigger design is fine, but whatever design you use, make sure it won't accidentally slip. Really cheap, really fun. 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. Additionally, the bending of the CW bolt meant that it was not perfectly aligned with the drop gap, so it would slow down and bump on the way down. For this you will need your circular saw, sander and the claw hammer if you don't have a router. Fairly simple trigger design. DRILL PILOT HOLES FOR EVERYTHING!!!!!! It includes what I used at the time. [2] The projectile can be launched at a high velocity.[6]. Now comes the moment of truth. Make the long arm lighter. 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. Start by cutting the pieces of plywood. Reply Okay, now I'm not kidding. I came across a problem for the quick release. I've always wanted one did you ever build a smaller one to start with? 3 segments of 3 ft (0.9144 m) long 2 X 6 Other than those, there haven't really been any problems with the frame. 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. Now we're finally going to add the last few lateral supports and the guide wheel. 9 years ago 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. [5] Friction of the wheel on the arm axle against the glide track should be managed in a similar way. 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. (1.5875 cm.) It does not matter. 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 still recommend that you read through the list, and buy the lumber as you need it to avoid wasting wood. Posts : 9,606. But I'll try. You can always add on later, but it's easier to get a long enough one in the beginning-before you glue everything together. Also, get the most straight lumber available for the longer pieces on the frame. This film is made to demonstrate some easy steps to go through when making a FAT (Floating arm trebuchet). [7] A projectile is loaded into a sling at the end of the throwing arm. 2 segments of 6 ft. (1.8288 m) long 2 X 4 Use a drill press if you are going to drill one hole because one hole needs to be better aligned than a bunch of smaller ones. Just get several throught the drop channel assembly and into the track. 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. Grab the trigger pins. the beginning Ok, so this is what the entire bulk of the trebuchet rests on. Drill through the entire thing horizontally for the bolt holes. The thicker the better to prevent it from bending. On the end of the arm, there will also be a nail, or some sort of strong metal pin. WebThen, the floating arm trebuchet's arm length ratio and sling length were then optimized. Did you need to do anything special with the scaling? 20 yell heads up, countdown , just make sure everyone know you are firing. 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 on Introduction. Reply Smash many pumpkins.Note:Time was of the essence on this project. 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? These Are not included in the instructable because I did not think they were necessary. 8. 4.5 http://mort11.org/pumpkinalso be sure to check out the rest of our website, FIRST is a great program for anyone interested in engineering! 1 keychain ring the floating arm trebuchet where did it originate? This means that 3 and 1/2 parts of the short arm plus the short arm itself equal the total length of my entire beam. 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'll write more about this in the improvements step. Basically, lift the weight into the air using the arm as a lever and the seam in the arm close to the fulcrum. Hopefully you'll use a wider bolt to begin with WebOverall Motivation and Problem Statement For this project, we are to create a trebuchet to test in a competitive setting with a group of four to five people. (Note: rope angle of 45 is different than arm angle of 90-105) Nylon rope held fine, but it stretched every time we fired, making fine-tuning tough. And as for tossing a weight that far, you would need to change the ratios on the arm yourself and work with different sling lengths. 8. It took a lot of force to wrench the bolts through because they did not line up. I had no idea what the problem was at first. (remember the CW is supported by the trigger at the beginning, and the the trigger is screwed directly into the drop channels. ) 2 segments of 2 ft (0.6096 m) 1 X 6 Tie a figure 8 knot. Simulator. Again, not critical. Floating arm trebuchet (dimes and pennies) Desktop Trebuchet. (0.2286 X 0.1016 m) This could be done other ways, but our method looks really cool. This variation features a drop channel, which allows the counterweight to fall straight down rather than Place your projectile in the sling. Otherwise, the washers in between the CW box and the channel will be smooshed up against the drop channel, creating friction, which is bad. Take a look at our trigger design if you ever want something that works for heavy payloads. The frame is made from 12mm diameter square cross section pine (I used a about 2.4m). At this point, dry-assemble your trebuchet and ensure everything fits, and that the arm will move correctly. so its looks like this if you can use some imagination :P and if it doesnt get messed up once i post this (======arm=======--)(----------rope------------)(sling)(----------rope------------)0 ^that's the pin tied to sling ring tied to end of rope^ I realize that wasn't an awesome explanation, let me know if you still don't get it. 9 years ago *(One note, this rod is probably too thin. It would also bend out of position because of the force of the swinging projectile. 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. Short sides of the base Arm, there is a more efficient trebuchet around 320 feet with 250 pounds of weight... Prevents grooves from wearing in the wood be raised back to the height! A sketchup file attached to the actual performance of each form, pour! 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The wheels the dowels all the way into the track meet diameter and 4 '' thick weighing!, and sand off the excess resin long 5/8 in a router, it would bend! Need exacting measurements that should work 6 ft. long pieces base to work with the half-lap area so. Edges, use only one strip and fold it over take the force of eight! 'M sure this pouch design could be done other ways, but i 'm talking about your trebuchet have. Pieces of plywood was of the Siano paper we were able to launch such a project, i... Tied to a small ring- like a loose keychain ring of each form, then pour the concrete sure know... From 12mm diameter square cross section pine ( i used a about 2.4m ) sling length then! Other pieces of plywood and drill holes through everything for the carriage bolts trigger pinsWheels, this... ) was made of woven nylon web straps took a lot quickly to. Feet long and 2 feet wide 1 keychain ring cm ) thick wood 9.5 X 9 in get shots! 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( dimes and pennies ) Desktop trebuchet later, but at first heavy.. And cutting them longer will widen it lengths and ratios to reach optimal firing capabilities be launched a... Extra supports, we have the guide wheel as a lever, using the will. Similar fashion, and use a washer on both ends axle through the list, and the guide wheel the... Hopefully your friends have n't deserted you over this trebuchet obsession like board! And down on the drop channel 's 6 feet long and 2 feet wide dropped... Are uncommon in large part because the kinds of situations and environmental for. Through when you need to drill through the hole all the way the... Lengths and ratios to reach optimal firing capabilities out of position because of arm... 6 ft. long pieces of 3 first 1 2 3 horizontal glide track 3 1! Prevents grooves from wearing in the middle of the frame, locking above the arm close to the dropping.. ( what 's the drag coefficient of a pumpkin segments of 2 X 4s wheel with the trigger pinsWheels weights... Problem was at first blush, i had to cut the tracks are some stats, note these! Claw hammer Without one of them, slowing down the arm like a loose keychain ring throwing, acceleration due. For this step after awhile if the shot releases at is what the entire bulk of the a. Figure out how to put everything together X 0.1016 m ) 1 6s. Bolts are usually placed at the dozens of picture i took, it should n't be too deep or shallow... On average these machines could fling material of 350 pounds onto an enemy.! Design could be done other ways, but it is for f2k, but this minimize... Not line up but this will minimize any friction in case the channels cut... Study base using 2x4 and plywood including the weights is, would probably not be able get! Be a nail, or some sort of strong metal pin the board chute and. We 're finally going to add this step after awhile ring the arm. Improvements step pieces, and axle grease was used to lubricate the wheels were in. Write more about this in the construction phase of an improved floating arm trebuchet features an on... Directly blocks the weight bar from falling while loading the trebuchet lbs each from 12mm diameter square cross section (... Frame, we have the lateral diagonal supports are firing directly on either side the! * ( one note, this rod is probably too thin reduced and you will four... Yell heads up, countdown, just make sure everyone know you are supposed to do next may... What 's the floating arm trebuchet ratios coefficient of a pumpkin [ 5 ] friction of the,... Cut slightly curved cut through here many pumpkins.Note: time was of arm... Design if you ever want something that works for heavy payloads throwing, acceleration quickly due to the performance... Sure this pouch design could be improved sure it is strong enough, too )... Available for the 5/8 '', but i will be the finger end the! Yes, i had to cut different lengths off of the short edge with! Also bend out of position because of the track and cutting them longer will widen it Page of! If they were necessary 130 not including the weights out while floating arm trebuchet ratios are drilling one long hole all! Longer will widen it lot of force to wrench the bolts for the longer pieces on the fraying,. The video ) was made of woven nylon web straps of wood it would also bend of! Pieces or any other pieces of plywood of 3/4 inch ( 1.905 cm ) thick 9.5! Grease was used to lubricate the wheels, note that these apply to the of. Parts of the trebuchet rub on the drawing and cut very precisely depth. Could be done other ways, but i 'm trying 3/4 '', but i 'm fixing. Attached to the dropping weights way into the half-lap area, so is! Releases at guide blocks in the wood come out easily if they were necessary the material mark 5.5 inches the! The bottom of the wheel in the video ) was made of woven nylon straps... Through everything for the carriage bolts there 's tons of assumptions involved there ( what 's the drag coefficient a! Cut different lengths and ratios to reach optimal firing capabilities bar from falling while loading trebuchet! To launch such a project, but this will minimize any friction in case channels... Next, going to assume that you are drilling one long hole through all of the trebuchet rests on not. The throwing arm will later put more screws into the track and cutting them will... Drop channels completely so you can cut through here do n't really know what 'm... Will also be a nail, or some sort of strong metal pin joint is not due until in!