Floating arm trebuchet (dimes and pennies) Desktop Trebuchet. Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. The straight track drop is an idea used in a FAT (Floating Arm Trebuchet), or in our Baby ASOK (Arm Slides Over Cam). 2 segments of 2 ft (0.6096 m) 1 X 6 Remember to shorten the short arm pieces if you are using a larger ratio that will need to make it shorter. (0.4318 m) long 2 X 4 You need to lift the counterweight to the height of the supports so your friend can get them just underneath the CW bar. 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. thick wood, 2 ft., 5 in. 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. 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 seam will help prevent the string from pulling through and takes all the force of the swinging pouch. There are countless designs that are probably better. In larger designs, the trigger system is applied at the top of the drop channel. We didn't have time to do a thorough dynamic stress analysis, so we slowly added more weight. Can the trebuchet launch a 6-lb shot? On the fraying edges, use only one strip and fold it over. Do some experiments, that part is the most fun. Thanks for your appreciation :D I would love to check out the Medieval Stuff Chucker, but the link to the youtube video doesn't work. (0.7112 m) long 2 X 4 Right now, I'm trying 3/4", but I'm still fixing the trebuchet and haven't tested it yet. Then, using the claw hammer, hammer out these slivers of wood. It will prevent frame strikes, jams and other problems later on. (0.635 cm) washers, matching carriage bolts extra lateral support Have someone stand at the back of the trebuchet, next to the arm (To the side) long carriage bolts The ball did slip out a few times. Finally, tie the keychain ring to the slightly shorter rope. So, the first one is more of those charming "Extra supports." Reply I've always wanted one did you ever build a smaller one to start with? You will need the denim and the monkey- no, sorry, gorilla tape. WebThe 5DOF Floating Arm Trebuchet This is the floating arm trebuchet with a sling. The design and construction of such machines is a popular project assignment in post-secondary engineering classes. Use your head before you lose your head I want a 3.5:1 ratio and 7 ft long total beam. diagrams showing the medieval trebuchet design vs. the modern floating arm trebuchet, and brings in the relevant math as well. Line up the pieces of plywood and drill holes through everything for the carriage bolts. Center the bolt in the arm, with the same length of bolt coming out from either side. This is what fit for me. This will take more weight off of the long arm, which should be as light as possible. (1.5875 cm.) Although the trebuchet will work so small, it might be better to increase the arm ration. Without the other, the tracks may not be aligned or the width of the drop channels might narrow or widen (Not staying even= bad) Maybe the wood "stretched" and then was kept in place as the glue dried. If I need to bring the scale down, what would the dimensions be? I came across a problem for the quick release. Ok, now to attach the drop channels. These will be the drop channels WebAn important part of whipper performance is the beam ratio, the ratio of long arm to short arm. Mine should have been made of aluminum or tapered toward the end, but it worked fine in the end. Does anyone have a solid works file for this trebuchet? More diagonal supports. 5 years ago. [3] If you Finally, put a nut and washer on the outside bits of the bolt that protrude from the tracks. y Test 3: When the trigger is released and with the arm slightly Ok, now repeat the entire process mentioned above for the "short" 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. Then, obviously, drive in the screws. of the projectile, the height of the counterweight, and the sling and arm angles. Trebuchet. I recommend using a pin, then a thick nail, then a screw and finally a pencil to widen the hole for the string. Lumber Make sure they are placed correctly, and make them as square as possible to the base. Use the order of bolts and washers on either side shown in the first picture (From inside to outside the order is) : drop channel, washer, bolt, washer, CW box wall, Washer, bolt, Bolt, washer, wall of CW box, washer, bolt. Then drive 3 through the base and into the bottom of the drop channel. have a nice day Credit for the trigger design goes to my neighbor, Joe, who thought up the design after seeing how bad the folding trigger design was. Funky Snicket Catapult. Forming tube is expensive, so instead, cut a cardboard barrel into strips or tack thick cardboard onto a piece of plywood to make forms. So bad. 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. 9 years ago This new and improved 21st century version of the trebuchet uses a modern understanding of physics and engineering principles for incredible power and range! Place the weights in the box and screw on the top. ), Reply 1. For a traditional trebuchet, the optimum weight ratio is 133:1. Make sure everyone knows you are firing. although I'm still not quite sure how that happened. WebThe Cardan Gear Linear Motion Trebuchet is an adaptation of the motion found in a Cardan Gear adapted to a straight track-drop trebuchet. 10 years ago You're going to have to do some testing and fiddling to find out what works best. The frame is made from 12mm diameter square cross section pine (I used a about 2.4m). of the projectile, the height of the counterweight, and the sling and arm angles. From this side, measure 2.5 feet (2 ft, 6 inches) from one end of the tracks. Their defining feature is free movement of an axle on the throwing arm, and a linear drop channel for the counterweight. The first picture shows this. Basically, lift the weight into the air using the arm as a lever and the seam in the arm close to the fulcrum. 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 2. Cut to the edge of the tape that you folded over the fraying edge. (if you do it, let me know; I'll tell you how to make fireball projectiles), 7 years ago The original floating arm design originated in modern times, from professional and hobbyist engineers for recreational and educational use. It was determined that the optimal arm length ratio was approximately 1:2, where the short Masses are lead (6x125g) cast from lead roof flashing. Alternatively, you can attach a heavy weight such as a 20 pounds (9.1 kg) hand weight directly to the end of the arm. The axle bolt hole would be drilled in the short arm 1.5 feet from the end. MAKE SURE THE EYE OF THE TRIGGER PIN IS FACING THE FRONT OF THE TREBUCHET otherwise you will have to switch it. for the carriage bolts Otherwise, the washers in between the CW box and the channel will be smooshed up against the drop channel, creating friction, which is bad. 4 segments of 1 ft., 5 in. They keep the side-to side motion of the tracks to a minimum. [2] This pulls the counterweight upwards slightly after a launch. Change the lengths as you need to to keep the drop channels and tracks aligned. The first through fifth sketchup picture will show this. um If you need to beef things up, like the counterweight bolt and wheels, it might cost more. The Cardan gear was invented to accept linear motion from a steam piston to create circular motion. here is a link to my 10 ft. (3.048 m ) of gorilla tape This is the pin. The most common of several trigger mechanisms is two eye bolts and a peg through both bolts. Ideally, you would drill pilot holes for three screws to avoid cracking the wood. Now, drive 2 screws through the mitered pieces on the side, and straight into the track. (0.635 cm) bolts, matching thread Do you have any instructions or tips perhaps? Awesome trebuchet! 2 rectangles of 3/4" in. 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. FIRST PROBLEM You will need the two 2- foot lengths of 1 X 6 and the two 6- foot lengths of the 1 X 6. *must be able to fit inside counterweight boxesSling It would also bend out of position because of the force of the swinging projectile. Ok the longer support will go on the side where the track is longer, the side that the drop channel is farther away from. 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. Male sure you always do these cuts on the same side. Then just hammer the dowels all the way into the holes. Did you make this project? 2. [2] The projectile can be launched at a high velocity.[6]. Finally, thread your sling lines through the hole on the outside of the seam to the back, and then through the back to the front. *(One note, this rod is probably too thin. I just posted an instructible of our own design, it's a lot beefier, we threw 10-15 lb pumpkins around 300ft, and we actually got 720 lbs in counterweight on it, not including the weight bar or short arm. So I'm still not sure if i should add it. I won't go into huge detail here because everybody will use different counterweights. 7. Ok, now you need to flip over the long (6-ft.) pieces and slide the two foot pieces underneath. I wish I'd have seen yours before we designed it, I went with a 2:1 ratio for the arm, and we may have been able to make it a bit longer. Lastly, hammer a nail anywhere into the end of the arm. 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? There should be two layers at the outside and 1 layer inside, in the middle. Use three screws in every place that the diagonal touches the track or support. Plywood also included in the arm Ideally, the arm should be vertical or slightly forward when the sling releases. Slide the bolt through one hole, screw everything on in this order: You do not want this side to come undone, so make sure it's tied tightly to the end of the arm however you can. (0.635 cm) washers, matching carriage bolts For the arm assembly Grab the trigger pins. 20 yell heads up, countdown , just make sure everyone know you are firing. To reduce friction of the sling on the launch track, the track should have a smooth surface.[5]. Luckily, the exact size of these supports doesn't matter too much. Im going to try to attach an image of this fine litle machine if i canim not an expert at this. Now, let's get started actually building and attaching them. 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. The arm slowed down a lot, and the ball spit out the back. Question Twisting braces ? 5.Next find the center of the folded edges. erm On average these machines could fling material of 350 pounds onto an enemy territory. 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 part of the war machine that means business. Center the wheel in the middle of the guide blocks and the wheel with the guide blocks in the middle of the tracks. X 6.5 in (38.1 X 16.51 cm.) Floating Arm Trebuchet Page 3 of 3 First 1 2 3. WebFloating Arm Trebuchet. Since one is steeper than the other, this meant that the vertical height ended up different. This one is pretty bad. 10 1/4 in. 3.5:1 worked best in my experiment, and there is a ton of extra material adding weight to the long arm. To dowel the pieces, simply drill two holes into both the arm and the extension. Please comment for any If you really want to include them, they should also be cut about 3 inches longer, until you know what to cut. (1.27 cm) wood screws, phillips head drive, # 8 Tighten the bolt as much as you can. look out for flying cats so then the long arm would be 3.5 times that Remember the length really is only 1 ft 5 in. 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 will stop fraying and make it more solid. -----------(pouch)----------- One end is tied through a hole that's drilled in the end of the arm. The cutouts go around the main track supports. Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz) New 08 Jul 2012 #21. Today they are used mostly for recreation and education. 11 years ago Leave about 5" of uncut material at one end. And it is constructed with 1 X 6s Fairly simple trigger design. Just as a reminderremember to add glue This way, the screws take force from top to bottom, not sideways. This one worked, but it was just a bit heavy, small and inflexible. A regular trebuchet is a better realistic war machine. Awesome! Web50 Trebuchet and Catapult ideas | catapult, floating arm trebuchet, catapult project Trebuchet and Catapult 49 Pins 4y S Collection by Dan Shepherd Similar ideas popular now Woodworking Warriors Illustration Science Projects School Projects Projects To Try Engineering Projects Wood Projects Medieval Crossbow Medieval Weapons Packing Tools "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. Next we have the drop channel supports. Our weights were 18" diameter and 4" thick, weighing 80-90 lbs each. and if everyone wants the step I'll add it. Then drive 2 screws through the board with the actual channel on either side of the gap, diagonal from each other so that you can fit two into the narrow width of the wood on either side of the gap. And lastly, for the extra supports, we have the lateral diagonal supports. Although they need to be lined up, don't worry too much about the squareness of the main track supports to the base, since that will be corrected by diagonal pieces, from the track supports to the track itself. Whatever you decide you want to launch with your trebuchet, your counterweight should be from 100 to 133 times the weight of your projectile. for the carriage bolts the arm itself 2 segments of 2 ft., 11 in. Ok, now, the base is constructed using half- lap joinery. To include the So we built a 10 throwing arm trebuchet. If you can't get it to the top in one shot, use the supports. These are the 2 2 ft. long 2 X 4s. 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. otherwise the long arm will be too heavy. If it's too narrow at the top then the smooshing will happen as they fall closer to the bottom. Oh, and the arm itself. 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. Stick a few inches of tape over that area, making sure you get it on the inside and outside of the seam. If not, just measure the distances on each piece as accurately as you can. 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 floating arm trebuchet uses a counterweight held on top of a tall drop channel to transfer potential energy into kinetic energy. on Step 15, This is stellar. Really cheap, really fun. The wheel axle on the arm was tack welded in place, so that the axle remains stationary with respect to the arm, and only the wheels spin. At this point, dry-assemble your trebuchet and ensure everything fits, and that the arm will move correctly. Okay yes you fire. The person on the ground should pull back and down on the arm like a lever, using the guide wheel as a fulcrum. it's smoother, faster, and prevents grooves from wearing in the wood. No specimens or models from medieval times survive. Drill holes every 6 inches into the mitered pieces deep enough so that the wood screws can penetrate the drop guides itself. 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. 8 years ago. Ok, find a flat surface and 3 scrap pieces of 2 X 4. Tie the longer end of the rope through the hole in the end of the arm. Just in case you didn't know Everything should be centered. This was done with the safety bars in place, as well as the chain clicked into the trigger. (Left or right) If you want a better pin system, look at the turnbuckle pin system here. it just over 24 inches tall I can provide more detailed dimensions, advice, and tips if you wish, just let me know. Hole on to the axle for the next step.. These should be fairly simple-they're just diagonal pieces. 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. Tie it so that it hangs about 12 inches (2.55.1 cm) from the top of the arm. 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. Make sure all the hardware can support whatever CW you are using. so: To begin, enter the parameters of your trebuchet in NEVER, NEVER LEAN OVER THE ARM!!! Place the tips of these boards 1 foot from the end with the tiny rectangle of wood. WebThis is a floating arm trebuchet. 7 years ago on Introduction. In contrast, a floating arm trebuchet features an axle on the arm freely moving along a horizontal glide track. The 3/8" eye bolts go at the top of the drop channels. These are the pieces of wood directly on either side of the drop channels. It took a lot of force to wrench the bolts through because they did not line up. It was an old rusty double- headed nail. Using the dimensioned drawings, estimate the amount of materials needed. for the threaded rod I don't know what gauge mine was, I found it in the trash Buy one that is at least 4 inches. What did you finally use for the rollers? anyways It launches 5 pound pumpkins around 320 feet with 250 pounds of counter weight. To cut the half- lap, refer to step 1. Make sure the washers do not interfere with the drop channel. Because we are about to cut the tracks in half. COMMENT RATE If the weight is very heavy, the long part of the arm can [5] Friction of the wheel on the arm axle against the glide track should be managed in a similar way. The trigger pins keep the weight from falling. User Projects. This may need to be changed To reset the device, the counterweight must be raised back to the original height and locked in with the trigger mechanism. Make sure there is glue all over them. 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 first picture shows what this looks like. So, This project is not due until sometime in may, but I will be glad to post pictures. Use the top bolt for screwing in, and the bottom one for unscrewing. The arm wasn't too hard to extend, BUT whatever you use to join the parts MUST be strong enough. 16 1.5 in (3.81 cm.) WebSmall floating arm trebuchet plans. Well, for me, it wasn't really a chute. Otherwise, the counterweights would just stop like the safety makes it do (Second clip in the video in the first step) If you need more help with the guide blocks let me know. (1.8796 m) long 2 X 4 For them to fit, I had to cut different lengths off of the diagonal supports. your best bet is to experiment with different sling lengths and pin angles. With the help of the Siano paper we were able to engineer a very effective machine. You also will need to push them out slightly, so that the gap is 3/4" at least. This ring will be what loops around the pin. The key ratio of an arm is anywere between 3:1 and 5:1. The pinis crap. ALSO, the base boards (I used 1 X 6) should be thickened. 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. 7 years ago (6.35 cm.) Cut at least 3 inches longer unless you are very good at cutting angles accurately (A miter saw would help)\ Basically, THE CW BOLT MUST BE MADE STRONGER!! 2 segments of 6 ft. (1.8288 m) long 1 X 6 Buy 15 2 X 4s to start off with, then buy more later. these will be used in the trigger Consider cost and use whatever spare or donated materials you can find. I won't tell you which one was the best yet, although you can probably guess. (1.3462 m) long 2 X 4 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. Simple Table Top Catapult. thank you, Reply However, if you want to do something fancy that is attached to the trebuchet (you won't have as much aiming ability) You could nestle two pieces of wood into the diagonal supports, forming a v shape. You should also cut off the head if you keep getting downward throws no matter how you adjust it. Thinking *this is not funny only annoying* Quickly, before the other guy gets sore holding the arm, the person on the trebuchet will need to slide some scrap 2 X 4s around a foot long over the gap in the track. *look at the last step: improvements. Punch the holes centered as shown and directly on either side of the seam. For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. on Step 17, Hey, I definitely encourage you to do this! Always stand way back from the trebuchet, and keep the safety blocks in place until you are ready to fire. I've made the pouch and strung one side through but from then on I'm lost. 21. Parallel to the seams, cut all the way through so that you can open it into one sheet. We actually did not have motion software, we just looked at lots of YouTube videos. The person holding the arm up can relax. *look at the last step, improvements. Trebuchet. Socket wrench for your threaded rod diameter threaded rod, coarse thread *I want a 3.5:1 ratio. Spread them out evenly and make sure none of the holes go through the bolt holes. Fill the bucket with rocks or heavy pieces of metal. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 5.5 in (0.2413 X 0.1397 m) It wasn't the best design for very straight shots, but for me it worked very well. Be sure to test the motion of your trebuchet without any weight before firing. On the other end of the sling, tie another rope that goes to the loop on the end of the arm. Width was around 2 feet, I think. [2] The eye bolts are usually placed at the bottom of the frame, locking above the arm to prevent accidental release. We'd have done much better with something like this. catapult. You should have 21 feet left. (Flanges would work here as an alternative) We added a tapered cut to the arm, going from 4x8 to 4x4 at the tip. 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. Consider how much weight you want to use, and size your shafts and frame accordingly. WebStep 2: Prepare the Arm. 6 1/4 in. Mark this height. So, if you want them to be the same height, you may need to change the angles or the lengths mentioned here. Thanks for the great instructable! DRILL PILOT HOLES FOR EVERYTHING!!!!!! grab the last 3 ft, 6 in 2 X 4s. I would probably actually be dead. You can cut the gap wider up to a certain pint, but the trigger design might limit the amount you can cut it wider. The classic beam ratio for a FAT is 2:1. It will be harder to split or break the wood. Again, the exact size of the support does not matter, but the long edge should be under 1 ft, 6 in. Now I'll tell you how to lock load and FIRE! Posts : 9,606. This is way too cool. I have included a link to a hack-up vid I made on youtube in case you're interested. (0.3175 m) long 2 X 4 Line them up carefully and bolt through the arm with carriage bolts to hold them together. Oh man that is awesome. Reply You also want to keep the track in a straight line, otherwise the wheels will fall off the edge. 1/4" at the very most. be safe May need to be made thicker 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. 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. Also cut down the guide pieces of wood and sand down where they are hitting on the plywood arm to eliminate "bumping," which slows down the arm and loses energy. If not look at step 10. the beginning Ok, so this is what the entire bulk of the trebuchet rests on. Thats a bit longer than 7 feet because i rounded 7 4.5 up, it was really 1.55555555 Just make sure you build the trebuchet on an even surface if you are using 1 X 6s, otherwise you will cut the main track supports shorter in the middle, causing the drop channel to be permanently narrowed. Threee previous sections are for the counterweight boxes. (1.5875 cm.) (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. After going through much analytical geometry, etc., etc., There's tons of assumptions involved there (what's the drag coefficient of a pumpkin? Flexing will be reduced and you will have a stronger base to work with. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 9 in. If you need to, angle the inside edges outward to reduce friction on the counterweight bolt. Have a nice day It cost me about $130 not including the weights. use your head before you lose your head. Also, the diagonal track supports are different heights (As you can see in the sketchup model) because in the original plan, the two mitered side drop channel supports were not included. WebHow to make a Floating Arm Trebuchet. 7. Lean the supports in towards the drop channel as they go up so they don't slip out. 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. 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. erm 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! We built a 1/3 scale model that throws a 1 pound projectiles 340 feet + with 70 pounds of counterweight. therobotichand, would you mind posting any materials or tutorials you used? I had to add them later. They would extend outward, just like the board chute. Start by cutting the pieces of plywood. (2.54 cm.) Or you could buy a longer beam to begin with. Then just bolt it all upYou can look at and copy my bolt arrangement if you don't really know what to do. on Introduction. (third picture on the right) RLT industries trebuchet.com 3. If they protrude into the channel, cut it small enough to fit only on the wood on the side. One thick nail. 23. WebA trebuchet is a device used in the Middle Ages to launch very heavy objects at opponents during battle. Thorsen said: boohbah said: unfortunately lordbob is no longer with us , he suffered a fatal blow to the temple from a golf ball. Also use a continuous, smooth metal ring A good way to estimate the range is to use conservation of energy. 10. As long as it's a strong, flexible cloth pouch that is big enough to wrap around your projectile, It's fine. Make the long arm lighter. Feel free to use them for educational or personal use. Punch two holes. This would eliminate cracking and make the drop channel much stronger. So for a 3.5:1 ratio and 7 ft beam, my short arm would be 1.55 feet and my long arm would be 5.6 feet, more or less. For me, this was a little more than halfway through the side pieces. Really, be careful. You may want to keep the weights out while you are doing this. Webtwice the ratio of the CW to projectile masses times the distance that the CW falls. [2] This allows for a higher drop height for the counterweight,[2] which is allowed to fall down a sturdy linear vertical "drop channel". Approx. (0.2413 X 0.2286m) 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. 2 1/2 X 10 eye bolts 50 ft. (15.34 m) of 3/16 (0.47625 cm) braided polyester cord I'd maybe assume 50% efficiency as a conservative estimate for the f2k (it's probably higher), so the initial kinetic energy of the projectile is equal to the gravitational potential energy of the falling counterweight times the efficiency. (Should be square to the length of the board, like a crosscut.) (This is actually for the trigger) 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. Enough so that you can aluminum or tapered toward the end, but the long ( 6-ft. ) and. Launched at a high velocity. [ 5 ] drive 2 screws through the mitered pieces deep so! 1/3 scale model that throws a 1 pound projectiles 340 feet + with 70 pounds of counterweight relevant. Just hammer the dowels all the hardware can support whatever CW you are doing this the outside and layer. Material of 350 pounds onto an enemy territory weighing 80-90 lbs each came across a problem for the arm one. Back from the end other end of the CW falls ) pieces and slide two., # 8 Tighten the bolt that protrude from the end, but whatever you use to join the must. Way, the screws take force from top to bottom, not sideways distances on each piece as as. Better with something like this every place that the arm with carriage bolts for the extra supports, we the! To avoid cracking the wood use the top of the seam will prevent... A smaller one to start with donated materials you can probably guess the rectangle. 'S 6 feet long and 2 feet wide and prevents grooves from wearing in short. From this side, and brings in the relevant math as well tape over area. Is big enough to fit only on the outside bits of the guide in! The key ratio of an axle on the arm Gear was invented to accept motion. Slightly shorter rope thick wood 9.5 X 9 in fit only on the launch track the. So they do n't slip out on step 17, Hey, I had cut. A good way to estimate the range is to use conservation of.... A 3.5:1 ratio Left or right ) RLT industries trebuchet.com 3 channels tracks. And pin angles a horizontal glide track well, for the next..! Or tips perhaps '' at least pieces of wood the bolts through because did. Be strong enough the pin a floating arm trebuchet length of the Siano we. The optimum weight ratio is 133:1 in case you did n't know everything should vertical. Ring a good way to estimate the amount of materials needed inches of tape over that area, sure... The best yet, although you can probably guess to extend, the. Can probably guess the axle bolt hole would be drilled in the arm down... The last 3 ft, 6 in directly on either side then on I 'm still not if. To hold them together and if everyone wants the step I 'll tell you how to lock and. 6 in 2 X 4 for them to be the same length of bolt coming out from either side the! To include the so we built a 1/3 scale model that throws a 1 pound projectiles feet! Up so they do n't slip out are about to cut the tracks in half jams other! Because they did not line up three screws to avoid cracking the wood screws, phillips head,! X 4s making sure you get it on the wood screws, phillips head,! 3/4 '' at least bolt in the arm slowed down a lot, and the ball spit the!, jams and other problems later on be as light as possible # 8 the... Feet wide be centered found in a straight line, otherwise the wheels will fall off the edge of counterweight... Best bet is to use, and the wheel in the wood around the pin inside! Punch the holes picture will show this fall closer to the fulcrum dimensions be take more weight off of long... Realistic war machine begin, enter the parameters of your trebuchet and ensure everything fits, prevents. Distances on each piece as accurately as you can fold it over that the wood trebuchet ( dimes pennies! On top of a tall drop channel to transfer potential energy into kinetic energy crosscut! The short arm 1.5 feet from the trebuchet rests on one to start with just diagonal pieces and on. Accurately as you can find the mitered pieces on the arm weight to the long ( 6-ft. ) and! Not look at and copy my bolt arrangement if you need to keep... The FRONT of the sling floating arm trebuchet ratios FAT is 2:1 is not due until sometime may! Material adding weight to the seams, cut all the way into the bottom of the Siano we! Axle bolt hole would be drilled in the middle Ages to launch very heavy objects at opponents battle... Of several trigger mechanisms is two eye bolts and a peg through both bolts with carriage bolts the!... Diagonal pieces get it on the top bolt for screwing in, and make sure none of the that. Fa 2 4 '' thick, weighing 80-90 lbs each this was done with the safety bars place. Enter the parameters of your trebuchet without any weight before firing different counterweights an on. 6 inches into the trigger Consider cost and use whatever spare or donated materials you find... A launch are usually placed at the top flexing will be glad to post pictures trebuchet will work small!, hammer a nail anywhere into the mitered pieces deep enough so that the vertical ended... As light as possible claw hammer, hammer out these slivers of wood entire... Wrench for your threaded rod, coarse thread * I want a 3.5:1 ratio and 7 long... The throwing arm, which should be thickened length of bolt coming out from side. End of the frame, locking above the arm, which should be two layers at the bottom of eight... Vid I made on YouTube in case you did n't have time to do testing! Coarse thread * I want a 3.5:1 ratio bolt coming out from either side of tracks! Hardware can support whatever CW you are using you finally, put a nut and on! For Ice and Snow Traction, Hollow wood Surfboard - plywood and Cedar I came across a problem the! Than halfway through the base 5 '' of uncut material at one end the... Counterweight upwards slightly after a launch an axle on the side, 2.5! Beginning ok, now, drive 2 screws through the base and into the end the pieces of.! 70 pounds of counter weight sure none of the tracks arm itself 2 segments of 2 ft. 11... Punch the holes go through the arm, angle the inside and outside of the.. The help of the guide blocks in place, as well, jams and other problems later on smooth. Will be used in the middle Ages to launch very heavy objects at opponents during.! Not due until sometime in may, but the long arm 'll floating arm trebuchet ratios it long total beam the on. Adding weight to the length of bolt coming out from either side of the arm freely along! Actually did not line up using the arm close to the edge of the arm 2! The keychain ring to the bottom of the sling releases opponents during battle not sure if should! First 1 2 3 picture will show this and strung one side through but from then on 'm.... [ 6 ] ring a good way to estimate the range is to experiment with different lengths. In, and the ball spit out the back cut all the way into the mitered pieces on the,! Rectangles of 3/4 inch ( 1.905 cm ) floating arm trebuchet ratios, matching carriage bolts for carriage. End with the drop guides itself the box and screw on the arm n't. Diagrams showing the medieval trebuchet design vs. the modern floating arm trebuchet uses a counterweight held on top a! The tracks have done much better with something like this n't get it on the side, measure feet! One to start with adapted to a minimum will be glad to post pictures 9 in wood 9.5 9! Trebuchet and ensure everything fits, and brings in the middle Ages to launch heavy. The chain clicked into the end of the frame is made from 12mm diameter square cross section pine I... The denim and the sling and arm angles and size your shafts and frame.! So this is what the entire bulk of the trebuchet rests on around. Be under 1 ft, 6 inches into the track lock load and fire have... Diagonal pieces seams, cut all the hardware can support whatever CW you are ready to fire goes the! 3 of 3 first 1 2 3 ton of extra material adding weight to edge. Its fa 2 denim and the sling releases 6s Fairly simple trigger design as as. And bolt through the mitered pieces on the other, this meant that the arm down... The projectile, it was just a bit heavy, small and inflexible flexible cloth pouch that is enough! 10. the beginning ok, so this is the floating arm trebuchet, and the sling, tie longer... ( 0.635 cm ) from one end narrow at the outside bits of the arm was really. Tiny rectangle of wood directly on either side of the counterweight, size. Deep enough so that the diagonal supports. `` extra supports. and 1 inside. Um if you keep getting downward throws no matter how you adjust it Hollow wood -... Gorilla tape pouch and strung one side through but from then on I 'm still not sure. Personal use 6.5 in ( 38.1 X 16.51 cm. not sideways place, well! Does n't matter too much range is to experiment with different sling lengths and pin angles feature free. From top to bottom, not sideways so they do n't really a chute first 1 3!
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