(1.5875 cm.) It cost me about $130 not including the weights. Hole on to the axle for the next step.. A shorter length sling will work better for lighter projectiles, while a longer length will be better for heavier projectiles. Then, drive in the screws. Scribe the line all the way down the length of the board. A traditional trebuchet, which is simple to engineer, consists of an arm resting off-centre on an axle with a hinged counterweight at the short end of the arm. Put a generous amount of glue on the flatter side, the 3.5 inch side. For this you will need your circular saw, sander and the claw hammer if you don't have a router. drill (The one I used here came in a kit here) with a varied drill bit set, for pilot holes, etc. X 1.5 in. awesome job! WebThe Cardan Gear Linear Motion Trebuchet is an adaptation of the motion found in a Cardan Gear adapted to a straight track-drop trebuchet. The lines shown in the 9th picture show 2.5 feet. *look at the last step: improvements. Circuits | Floating Arm Trebuchet : 7 Steps (with Pictures) - Instructables Make sure all the hardware can support whatever CW you are using. This variation features a drop channel, which allows the counterweight to fall straight down rather than 1. They're probably correct, I'm just letting you know. Keep everything tight. slide the bolt the rest of the way through the other hole. And back up at least 20 feet when firing (The sides are safest) on Introduction. These will be the drop channels 4. .and several of the bolts for the 5/8" threaded rod. Our weights were 18" diameter and 4" thick, weighing 80-90 lbs each. on Introduction. Take off the drop channels completely so you can cut through here. 10 1/4 in. 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 The pinis crap. At this point, dry-assemble your trebuchet and ensure everything fits, and that the arm will move correctly. Start by cutting the pieces of plywood. To do this, I stood the arm vertically on the ground, then climbed to the top of a ladder with a mallet. Short sides of the base To include the sling, a much more constraint-intensive (5DOF) approach is required. *A few notes: the angles were based off of the sketchup model which had a few errors. Mortise and tenon joints here would be best, but I didn't feel like they were necessary. This would, however, change the lengths of the diagonal supports. On the folds themselves, use one strip of tape per side with a slight bit of overlap and stick the two pieces together. It will prevent frame strikes, jams and other problems later on. If you really want to include them, they should also be cut about 3 inches longer, until you know what to cut. I want a 3.5:1 ratio and 7 ft long total beam. jk. F Building of Vertical Supports F 2x3 28in Build functioning catapult Torsion or trebuchet Maximum volume 227,000 CC Minimum Volume 125,000 CC Reply Approx. This is what fit for me. The trigger is a fairly simple design. How would this work at half the size? 7 years ago. Two last things How much will this cost? Today they are used mostly for recreation and education. A mortise and tenon joint would have also probably worked. Basically, lift the weight into the air using the arm as a lever and the seam in the arm close to the fulcrum. I've always wanted one did you ever build a smaller one to start with? Awesome trebuchet! 6. Cut through here. They flexed a lot and caused several problems when I was building the trebuchet. Does anyone have a solid works file for this trebuchet? I would still recommend doing one, though. 4 segments of 1 ft., 5 in. Then bolt on the wheels. Width was around 2 feet, I think. I'll post pictures as we get underway. Try to determine the problem. speed square 3. on Introduction. If you make the channel a lot wider, I would suggest using a wider piece of wood or strength. You will later put more screws into the half-lap area, so the joint is not only held together by these screws. If it's too narrow at the top then the smooshing will happen as they fall closer to the bottom. For the drop channel, I would recommend using two separate boards for each side. The first picture shows what this looks like. Thanks for writing this 'ible. [2] This pulls the counterweight upwards slightly after a launch. Lastly, drill a hole through both the walls of each box at least two inches from the top edge for the counterweight bolt. Use the top bolt for screwing in, and the bottom one for unscrewing. As I said before, the longer diagonal support will be on the side of the drop channel that is farther away from the end of the tracks. Then, using the claw hammer, hammer out these slivers of wood. Keep pulling back on the arm until the counterweight bolt is about 3 inches over the topside of the tracks. Otherwise, make sure they are perfectly aligned and a 5/8 rod can fall through with little friction. 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 5. Position them in between the two main track supports and trace a line as best as you can along where they overlap; this is where you will cut the half-lap. The axle will have to easily pass in between them. WebThe 5DOF Floating Arm Trebuchet This is the floating arm trebuchet with a sling. Remember the bumping problem. Once everything is square, true, straight aligned or whatever you feel like saying, We can put this beast together. 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. Thanks! You should also cut off the head if you keep getting downward throws no matter how you adjust it. I attached the arm extension to the rest of the arm with some wood pices, dowels and some leftover aluminum channeling. I won't tell you which one was the best yet, although you can probably guess. Cut them low but long out backwards. 3 ft. (0.9144 m.) long 5/8 in. ya that sounds good 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. The arm can be longer than your sheet of wood, but make sure the gaps between the pieces are in different spots for each layer. Ok, find a flat surface and 3 scrap pieces of 2 X 4. The tighten the bolt against the short arm and the bolt on the very outside. The second length of rope is tied to a small ring- like a loose keychain ring. 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! Lastly, cut through the plywood rectangle so the wheel does not bump over the edge of the plywood as the arm falls. 4 years ago. FIRST PROBLEM I like the adjustable arm ratio. 2 1/2 X 10 eye bolts 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. 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. They would extend outward, just like the board chute. Once both dowels are in one of the pieces, line up the other one and tap it down onto the dowels. Hopefully you'll use a wider bolt to begin with Lay the last three pieces of the 2.5 foot sections on top of the arm. Untangle the ropes and walk the long one out its length to the front and side of the trebuchet. If you are going to use a thicker CW bolt, you need to make the drop gap wider. on Introduction. The Floating Arm Trebuchet. [5], The dropping of the counterweight forces the arm to swing to one side of the glide track and quickly jerk in the opposite direction to launch a projectile. Or you could buy a longer beam to begin with. (0.4318 m) long 2 X 6 Our starter model was 1/6 scale, it threw a bouncy ball 270 feet with 10 pounds of counterweight. with that. And, I'm not looking to chuck this 200yds. To reduce friction of the sling on the launch track, the track should have a smooth surface.[5]. -The box needs to be made narrow enough to fit on the outside of the drop channel and still have room to be loose..that's room for other bolts and washers. I've seen some really nice f2k's that have the wheels jump the gap on a ramp, but that would require much more engineering calculations and dynamic tuning than we had time for. I used the trebuchet frame as a fulcrum to lift it in the air. Now, I believe that the width between the bottom of the main track supports is somewhere around 1 ft, 1 inch. The arm wasn't too hard to extend, BUT whatever you use to join the parts MUST be strong enough. Because we are about to cut the tracks in half. Next, grab you trigger pin and just hold it beneath the CW bolt. there are small cracks throughout the trebuchet now because I was lazy. If you have built it up till now I'm pretty sure you will be able to figure out whatever the problem is. I've uploaded PDF's of the CAD drawings as well as a general schematic diagram for an f2k. diameter threaded rod, coarse thread I'll write more about this in the improvements step. They would at the very least be a good guideline. (0.4318 m) long 2 X 4 To cut the half- lap, refer to step 1. 1). You want the drop channels to be the SAME DISTANCE APART THE ENTIRE WAY up and down their length. (15.24 cm.) NEVER, NEVER LEAN OVER THE ARM!!! Summary The floating-arm trebuchet, a modern variation of a medieval weapon, is a popular project for physics and engineering instructors.We develop and analyze a model of this device as an introduction to constrained Lagrangian dynamics. The arm is the key part in the trebuchet, as it provides the momentum, the height, and contributes to the angle of release. Here's some vid of ours. Now he needs to grab two supports of any kind (probably scrap wood) Make sure it is strong enough to support the counterweight. 7. A pair of wheels allows the arm to roll along This is it. Finally, tie the keychain ring to the slightly shorter rope. Just in case you didn't know Remember, smooth transitions. 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. Make the arm from the 1/2" x 3" x 36" pine board. That's its fault. Unless one eye bolt cannot support the weight, relax. thick plywood, 2 ft., 5 in. User Projects. WebThen, the floating arm trebuchet's arm length ratio and sling length were then optimized. 17. use your head before you lose your head. 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. Change the lengths as you need to to keep the drop channels and tracks aligned. Reply um http://mort11.org/pumpkinalso be sure to check out the rest of our website, FIRST is a great program for anyone interested in engineering! It shouldn't be too deep or to shallow for your projectile, and should hug the surface of your projectile well. Again, the lengths can be changed slightly, but you want at least 22 feet of length away from the trigger pins when you fire. 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. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 9 in. Ensure that the shafts you choose have a diameter that mates well with your inside wheel diameter, as well as your inserts. 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. Lastly, hammer a nail anywhere into the end of the arm. Make a square line across the flat side of the board. [4] The higher the drop channel, the more energy is released, but this puts more strain on the mechanism. will this still work that small? Harmonic balancers work well for wheels, and can be pulled from a V8 engine at a junkyard. 3/8 X 4 eye bolt (Including bolts) Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. Funky Snicket Catapult. Center the wheel in the middle of the guide blocks and the wheel with the guide blocks in the middle of the tracks. Luckily, I eventually lined up the holes. Center the bolt in the arm, with the same length of bolt coming out from either side. What did you finally use for the rollers? You will need the two 2- foot lengths of 1 X 6 and the two 6- foot lengths of the 1 X 6. Cut a piece of steel pipe for an insert and place it at the center of each form, then pour the concrete. Your arm should look nice and smooth like the pics. On the fraying edges, use only one strip and fold it over. 8 years ago Long sides of the base First, pick one end of the trebuchet to be the back. Be sure to test the motion of your trebuchet without any weight before firing. What I do not ), but I came up with distances reasonably close to the actual performance. This is the pin. The frame is made from 12mm diameter square cross section pine (I used a about 2.4m). So, cut the first twisting brace, on the very front, as wide or narrow as you need it to keep the drop channels straight. 15. If not look at step 10. 3. This is a general description of how to create a floating arm (f2k) trebuchet. When firing, make sure no-one is down range, near to, or directly behind your trebuchet. Ok, now repeat the entire process mentioned above for the "short" side. 8. This is it. The part of the war machine that means business. The Arm. Luckily, It's also pretty simple to  make. You need: 6 segments of 2 You will need the denim and the monkey- no, sorry, gorilla tape. (7.62 X 3.81 cm) diameter wheels, 5/8 id bearing load rating of 200 lbs (90.71 kilos) or more about 250 2.5 in. If it is, that will be solved later in the finishing touches step. nut, washer, guide block, wheel and bearings (Go together) , guide block, washer, nut. If you do end up building a floating arm trebuchet, please let me know. 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. Drill a hole somewhere near the end of the armit doesn't matter, but it should be at least 3/4" from any edge. Webagain revised in spring 2002 with the introduction of the Floating Arm Trebuchet. Their defining feature is free movement of an axle on the So, the first one is more of those charming "Extra supports." Now, let's get started actually building and attaching them. [5], A floating arm trebuchet has three points of contact where friction can interfere with efficiency. Do some experiments, that part is the most fun. That should bend it back upward. 23. also screwdriver bit driving in your screws. 1. If you need to beef things up, like the counterweight bolt and wheels, it might cost more. Then fold in on top of the other one to crinkle the pouch into a more pouchy shape. 2. The arm will not swing up. He can back away. Or you could use the angles I give you. um.. 3 segments of 3 ft (0.9144 m) long 2 X 6 There are two main safety mechanisms: The safety blocks, which prevent the arm from falling, and the second is common sense. on Introduction. i need to make mine 3x3x3. Please comment for any have a nice day 7 years ago Thats a bit longer than 7 feet because i rounded 7 4.5 up, it was really 1.55555555 Now we're finally going to add the last few lateral supports and the guide wheel. Cut these two twisting braces at around 1 ft 2 inches because the length of these will affect the width between the tops of the two drop channels. Reply If you have a certain ratio in mind but you do not know the lengths, use this example: The ridges would sometimes catch on the heads and sometimes not. Still, it was strong enough with all the gorilla tape. It's a little bit tricky to get the angles perfect. Heavier projectile= earlier, lighter projectile = later. ) for the sling These are the trigger pins. Luckily, the exact size of these supports doesn't matter too much. 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. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9 X 4 in. Male sure you always do these cuts on the same side. Masses are lead (6x125g) cast from lead roof flashing. The box should have a bottom that is "outside" the walls, screwed in from this bottom and into the walls, not through the walls and into the bottom. 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. Reply Tighten the bolts together, sandwiching the washer. I made my own (although on a slightly smaller scale. 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. Reply Floating Bridge Design and Construction - How Floating Bridges Work | HowStuffWorks. Line up the holes in the arm with the drop gap. 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. 8. The floating arm trebuchet uses a counterweight held on top of a tall drop channel to transfer potential energy into kinetic energy. 4. 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. look in improvements, may need to be changed After going through much analytical geometry, etc., etc., 6 1/4 in. nails will slide out of the wood, and will not keep the box together. claw hammer Even though IT'S VERY DANGEROUS IF YOU DO IT INCORRECTLY!!) I have real pictures, but no sketchup ones. Projectiles can fly backwards, so keep people and cars AWAY from this area. Just find a pair of old jeans A solid metal ring of any kind would work better. hacksaw if you don't have a METAL CUTTING BLADE FOR YOUR JIGSAW, Make the long arm lighter. Angle iron or steel sheet would work. 10 years ago 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. [2] The arm then jerks forward and releases the projectile from the sling. drive 3 screws through the base and into the bottom of the diagonal, and 3 more through the diagonal and into the mitered side support pieces. This will take more weight off of the long arm, which should be as light as possible. That was bad. on Step 17, Hey, I definitely encourage you to do this! (third picture on the right) RLT industries trebuchet.com (0.889 m) long 2 X 6 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. Arm-sling constraint, arm roller on fixed track, projectile on ramp. Reply So, use the turnbuckle system I mentioned in the introduction. Additionally, I would make the arm as long as possible as well. The longer side is responsible for throwing, acceleration quickly due to the dropping weights. Line them up carefully and bolt through the arm with carriage bolts to hold them together. Also use a continuous, smooth metal ring grab the last 3 ft, 6 in 2 X 4s. This is way too cool. As it turned out, our design was over built and held up well. 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. (0.635 cm) bolts, matching thread fourth through fifth picture will show this. WebStep 2: Prepare the Arm. look out for flying cats This was done with the safety bars in place, as well as the chain clicked into the trigger. *(One note, this rod is probably too thin. 4 segments of 4 ft., 5 in. WebThe Floating Arm Trebuchet: The floating arm trebuchet is a modern take on an ancient war machine. Sorry I haven't responded until now. These keep the arm straight as it is being loaded and dropped. (0.635 cm) bolts, matching thread Also, 1 inch thick wood would would be stronger.Hardware The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. (1.8796 m) long 2 X 4 WebThe short arm/ long arm ratio is what I was testing, and the different ratios are 2:1, 2.5:1, 3:1 and 3.5:1. 2. First, the two pieces are drilled and doweled. First, grab two of the 8 foot long pieces. 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. This way, the screws take force from top to bottom, not sideways. i just copied that Make sure they are placed correctly, and make them as square as possible to the base. 7 years ago But I'll try. (0.2286 X 0.1016 m) When you look at the picture, they are the big, tall, straight pieces. Although later there are more. Since one is steeper than the other, this meant that the vertical height ended up different. 6 1/4 in. Posts : 9,606. The Cardan gear was invented to accept linear motion from a steam piston to create circular motion. i need the axle on the end of the throwing arm to slide up and down within the rectangular slot running up and down the center of the main truss. (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. lateral supports Look at the pictures to see this; it's kind of hard to explain the placement in words. I like getting comments. denim fabric 2 rectangles of 3/4" in. Make sure the axle bolt is short enough to clear the frame easily. Parallel to the seams, cut all the way through so that you can open it into one sheet. With the help of the Siano paper we were able to engineer a very effective machine. 3. the base Trebuchet. NEEDS TO BE MADE THICKER: LOOK AT IMPROVEMENTS (0.7112 m) long 2 X 4 The trigger held up well, but it did take a pretty hard tug to get it to release with max weight. 1/4" at the very most. 2 X 4s at a 45 degree miter. 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. It worked fine for me, though. Without one of them , the arm would simply fall into the ground. 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. SECOND PROBLEM I would still recommend that you read through the list, and buy the lumber as you need it to avoid wasting wood. it just over 24 inches tall I can provide more detailed dimensions, advice, and tips if you wish, just let me know. The first picture shows this. If you could find a simulator that would be great, but I never could. Thank you for reading through all this, and let me know if you actually build this monster!! *I want a 3.5:1 ratio. The angle and length of the pin control when the sling opens. Double- check everything. 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. 2 segments of 8 ft (2.4384 m) long 2 X 4 Did you make this project? Simulator. Make sure the washers do not interfere with the drop channel. 4.5 The thicker the better to prevent it from bending. Otherwise, the counterweights would just stop like the safety makes it do (Second clip in the video in the first step) 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. They must be perfectly straight and lined up. (0.3175 m) long 2 X 4 Use a forstner bit or any other drill bit and drill holes parallel to the length of the long 1 X 6 and near the inside corner. Okay step one. (Order from inside to outside.) Our sling (not pictured, there is a shot of it in the video) was made of woven nylon web straps. Different jeans vary, so this next step might be different for you. Take a break. These are the 2 2 ft. long 2 X 4s. This film is made to demonstrate some easy steps to go through when making a FAT (Floating arm trebuchet). washers In larger designs, the trigger system is applied at the top of the drop channel. WebVirtualTrebuchet is a web based trebuchet simulator that will allow you to quickly evaluate different trebuchet configurations. Otherwise, the washers in between the CW box and the channel will be smooshed up against the drop channel, creating friction, which is bad. Did you make this project? First of all you need two people Also, get the most straight lumber available for the longer pieces on the frame. 1. 2 hand weights, 10 lbs (4.54 kilos)* The key ratio of an arm is anywere between 3:1 and 5:1. I don't really know what I'm talking about. Hopefully everything has been built straight and solid. The bottom is the side where the 2 ft 1 X 6 overlaps the long 1 X 6. For me, this was a little more than halfway through the side pieces. Right now, I'm trying 3/4", but I'm still fixing the trebuchet and haven't tested it yet. If you can't get it to the top in one shot, use the supports. Luckily, It's also pretty simple to make. Finally, thread the Axle through the other hole in the middle of the arm. They should come out easily if they were cut narrowly enough. 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. Remember, though, that if your short arm is shorter you will need fewer bolts. 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. For me, for the side with the longer support, this was about 5 ft, 7 inches from the very bottom of the drop channel. The seam will help prevent the string from pulling through and takes all the force of the swinging pouch. 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Cut narrowly enough 0.9144 m. ) long 2 X 4 in can interfere with drop... The channel a lot and caused several problems when I was lazy webthe Cardan Gear invented. Probably correct, I stood the arm with the introduction counterweight upwards slightly after launch. The short arm is shorter you will later put more screws into the half-lap area, so this step! Fulcrum to lift it in the 9th picture show 2.5 feet to explain the placement in words easily they... Step 1 dowels are in one of them, the trigger the weights track should have a router up now.. [ 5 ], a much more constraint-intensive ( 5DOF ) approach is required saw, and... Bolts, matching thread fourth through fifth picture will show this you can open into. 2- foot lengths of the trebuchet arm trebuchet this is a web based trebuchet simulator that will be to... Always do these cuts on the fraying edges, use one strip of tape per side with a.. Them together the picture, they are perfectly aligned and a 5/8 rod can fall with! ( one note, this was a little more than halfway through the other, this rod is probably thin... Put a generous amount of glue on the ground, relax the trigger demonstrate some steps... The box together 4 did you make the arm then jerks forward releases! It in the improvements step interfere with efficiency the topside of the pieces, line up holes... Webthe 5DOF floating arm trebuchet with a slight bit of overlap and stick the two 2- foot lengths the. Process mentioned above for the 5/8 '' threaded rod, coarse thread 'll... Buy a longer beam to begin with probably too thin does n't matter too much was made of woven web. And sling length were then optimized perfectly aligned and a 5/8 rod can fall through with friction! An adaptation of the base first, the floating arm trebuchet: the angles.... Higher the drop gap wider and can be pulled from a V8 engine a. A shot of it in the improvements step counterweight bolt and wheels and. Found in a Cardan Gear was invented to accept Linear motion trebuchet is a modern take an... A simulator that will be able to engineer a very effective machine ( 2.4384 m ) 2. ( floating arm trebuchet from the sling on the fraying edges, use the angles give!, although you can open it into one sheet parts MUST be strong enough all. Prevent it from bending of 5 ft., 10 lbs ( 4.54 ). 'S a little more than halfway through the other hole in the arm will move correctly lengths 1. Use a thicker CW bolt, you need: 6 segments of 2 you will need fewer bolts ) the!

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