There's a sketchup file attached to the instructable, so if you need exacting measurements that should work. To dowel the pieces, simply drill two holes into both the arm and the extension. X 6.5 in (38.1 X 16.51 cm.) On the fraying edges, use only one strip and fold it over. 6. You may even be able to get away with less. Keep the top part aligned, and carefully trace a line on the diagonal along the edge of the base. About: Mechanical Engineer in the machine design industry. (KE = .5*GPE, so .5mv^2=.5mgh) Solve for the velocity. Upon releasing the trigger, the counterweight is allowed to drop through the channel. The tighten the bolt against the short arm and the bolt on the very outside. (0.635 cm) diameter, 5.5 in. 3 3 in. it's smoother, faster, and prevents grooves from wearing in the wood. Measure the amount of space in between the drop channels. Beside the arm when it's at rest, these two channels are the tallest point of the trebuchet. This thing is powerful, which is why you need a trigger. 3.5+1 represents the total length (Short plus long arm). You want to keep the width relatively narrow, but wide enough to accommodate whatever projectiles you plan to use. Check the alignment of the rails and ensure they are relatively close. -----------(pouch)----------- One end is tied through a hole that's drilled in the end of the arm. One drill bit MUST be the size of your threaded rod (Mine was 5/8", it should be thicker) Ideally, the drill bit would be a foot long, or 6 inches, so that the holes in the arm don't become misaligned. The person standing on the trebcuhet is no longer in danger unless he drops the bolt on his foot. [2] The projectile can be launched at a high velocity.[6]. The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. For them to fit, I had to cut different lengths off of the diagonal supports. Large scale designs require special trigger mechanisms that can hold the weight of the throwing arm. Axel for the masses is coathanger wire but ensure the axel never absobs the full impact of the falling masses as it will bend. 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. 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? Mark this height. (0.7112 X 0.0889 m) Unless I've forgotten something, I think we're done. A shorter length sling will work better for lighter projectiles, while a longer length will be better for heavier projectiles. If I need to bring the scale down, what would the dimensions be? Ok, now repeat the entire process mentioned above for the "short" side. WebFloating Arm Trebuchet. For the arm assembly (0.635 cm) washers, matching carriage bolts long carriage bolts 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? (We crashed once during test firing due to this) Be sure to bring bubble levels. It should be drilled all the way through the flatter 3.5 inch edge side. They have the same orientation as the main track supports. 5. i need to make mine 3x3x3. First, grab your counterweight bolt (hopefully thicker than 5/8") and use some sort of clamp to keep it pushed up against the top piece of wood, as if it was being loaded. on Introduction. Additionally stresses on the arm will be (exponentially?) for the carriage bolts So, again, cut off the ends of all the 1 ft, 5 in. 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. We're all a bit nerdy and geeky and figured a weekend engineering challenge was a good way to make camping and drinking more awesome. This was a bit too heavy as we had to load each weight manually to fire our trebuchet. 10 1/4 in. 7. 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. Before we start, there were a few problems. The knot should be on the inside of the pouch. [5], A floating arm trebuchet has three points of contact where friction can interfere with efficiency. The pin is made of all thread, 1 ft long, with the threads on the end ground off. Keep the hole in between the main track supports and the diagonal track supports. View on Taylor & Francis Save to Library Create Alert Cite One Citation Citation Type More You also need the braided polyester cord and the keychain ring. This variation features a drop channel, which allows the counterweight to fall straight down rather than there are small cracks throughout the trebuchet now because I was lazy. These will be the drop channels use your head before you lose your head. SolidWorks was used here, although any CAD software or even a hand sketch would be ok. One advantage of 3D CAD was the ability to make an assembly and ensure a good fit for all the components, as well as smooth motion. This allows us to swap out pins, or adjust forward and backward. Thank you for your generous gift to the DIY community. This makes the arm much stronger than regular lumber, allowing for more counterweight, larger projectiles, and a stiffer, more efficient arm. Their defining feature is free movement of an axle on the Have someone stand on the front half of the trebuchet. This will take more weight off of the long arm, which should be as light as possible. It launches 5 pound pumpkins around 320 feet with 250 pounds of counter weight. 0. (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. Lower it below the base, just rest it on the floor. Attach a 20ft + length of rope to the release mechanism on the door latch. 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. attach an appropriate length of 1900lb test chain. This will prevent the counterweights from falling. 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. 3. Yes i am proud to be This is essential for an efficient machine. If not, just measure the distances on each piece as accurately as you can. have a nice day 6 1/4 in. the base This, in turn, changes the width of the drop channels to narrow (BAD) or widen (usually better). Always stand way back from the trebuchet, and keep the safety blocks in place until you are ready to fire. here is a link to my 3 ft. (0.9144 m.) long 5/8 in. A small-scale replica of War Wolf, a counterweight trebuchet that uses a boulder-holding sling at the end of a swinging arm. WebStep 2: Prepare the Arm. Did you make this project? Again, use a bowline knot. 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. 4. The arm is on a moving axle and the torqueD|volume=26|doi=10.1088/0143-0807/26/4/002|issue=4}} The forward motion of the axle as the arm rotates adds speed to the projectile end of the arm. Also, the box needs to have a top so the weights don't come flying out when it reaches the bottom of the drop. 3. For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. This step is fairly simple. First, you need to know And it is constructed with 1 X 6s 50 pounds that was used here. Ensure that the tension will be applied in a direction that is similar to the way it is intended to be used in a car door. The angles shown in the pictures are based off of the sketchup model, but they seem to be correct. These go in the front. The weight bar was 1.5" diameter, AISI 4140 cold drawn (probably overkill) and the axles were 1.2" diameter, AISI 1020 CD. erm Line up the holes in the arm with the drop gap. I have no clue what it is for f2k, but it is a more efficient trebuchet. (0.4318 m) long 2 X 4 Push one of the corners of the diagonal support next to the bending brace, but keep it one the base. If this happens, use it on a hill or place two very thin pieces of scrap wood under the base, directly under the drop channels. You will need the denim and the monkey- no, sorry, gorilla tape. Tie it so that it hangs about 12 inches (2.55.1 cm) from the top of the arm. The arm is the key part in the trebuchet, as it provides the momentum, the height, and contributes to the angle of release. with that. 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. I recommend using a pin, then a thick nail, then a screw and finally a pencil to widen the hole for the string. You can use a clamp and a tape measure in combination to figure out the right lengths before you cut them. 4 segments of 1 ft., 5 in. He was right. Flexing will be reduced and you will have a stronger base to work with. This will stop fraying and make it more solid. These keep the distance between the two tracks from narrowing or widening. 3/8 X 4 eye bolt (Including bolts) 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. Socket wrench for your threaded rod A mortise and tenon joint would have also probably worked. on Introduction, hey I'm a physics student trying to replicate your design. From this line and out to the edge, cut 3/8" deep (Half the depth of a 1 x 6) with your circular saw every 16th of an inch or so, all the way across the flat side. 1.6 X 3.5 = 5.6 I would greatly appreciate it if i can take a look at it. I think that's it Well, for me, it wasn't really a chute. on Introduction. FDM 3D Printing; SLA 3D Printing; look in improvements, may need to be changed 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. speed square Everything should be centered. 2 segments of 2 ft (0.6096 m) 1 X 6 The two bits at the open top of the cut channel..keeps the drop channel from "opening" We'd have done much better with something like this. Really, you just want something to support your sling during the first part of the arm's swinging so the sling is not dragging on the rough ground. 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 They flexed a lot and caused several problems when I was building the trebuchet. i am building a trebuchet for my physics class. That is to say, you should make sure your drop towers reach the full length of the 80 meter height. If it is, that will be solved later in the finishing touches step. Feel free to use them for educational or personal use. Tighten the bolts together, sandwiching the washer. On the other end of the sling, tie another rope that goes to the loop on the end of the arm. Just on top of the tracks. All you are really doing is putting the arm in the drop channels. Next, grab you trigger pin and just hold it beneath the CW bolt. Hey Chans2901, Thanks for your questions, I love trebuchets! I have to study your plans before I decide whether to tackle such a project, but at first blush, I am impressed. 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. This time, It's half the depth of 1 2 x 4, which is 0.75 (3/4) inches. Yes I want a small one for the classroom and large one for the field. Just get several throught the drop channel assembly and into the track. If you are going to use a shorter ratio, such as 3.5 : 1, make the short arm pieces shorter. simplest step. Ok, looking at the main pictures, there are two more big things that need to be added to the mainframe. the floating arm trebuchet where did it originate? Make sure your projectile is in the sling (Yes we do forget that a lot) the ring is on the pin, the CW bolt won't get stuck on the eye bolts coming out of the drop channels and that the safety blocks are still in, along with the weights (Obviously) Ok, now you need to flip over the long (6-ft.) pieces and slide the two foot pieces underneath. Remember, even if you drop the CW, the safety blocks will prevent the arm from swinging up. 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. Lastly, make sure everything is square. And do lots of testing, with a realllllly long trigger string. I like getting comments. This is the hardest part of loading. Ok the longer support will go on the side where the track is longer, the side that the drop channel is farther away from. 8 years ago. Still, it was strong enough with all the gorilla tape. When the trebuchet is placed on an uneven surface, the base will sag into whatever dip or bend upwards because of whatever hill. 4.5 Slide the bolt through one hole, screw everything on in this order: The walking arm trebuchet is a good example, which uses an unconventional design to great effect. [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. Finally, tie the keychain ring to the slightly shorter rope. The pinis crap. 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. If you have built it up till now I'm pretty sure you will be able to figure out whatever the problem is. To begin, enter the parameters of your trebuchet in We are to have a constructed trebuchet and have it prepared to launch on Tuesday, April 23. (2.54 cm.) 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. (if you do it, let me know; I'll tell you how to make fireball projectiles), 7 years ago It wasn't the best design for very straight shots, but for me it worked very well. therobotichand, would you mind posting any materials or tutorials you used? At the tip of the arm, we welded a steel box around it to hold the pin for the sling release and a loop to tie the other end of the sling rope to. Even though IT'S VERY DANGEROUS IF YOU DO IT INCORRECTLY!!) 24. There are plenty of places you can go on the internet to look for better ideas. Luckily, It's also pretty simple to make. Mark the height that you want the diagonal support to rise to. WebThen, the floating arm trebuchet's arm length ratio and sling length were then optimized. The trigger is a fairly simple design. (1.5875 cm.) 2 segments of 8 ft (2.4384 m) long 2 X 4 *I want a 3.5:1 ratio. Different jeans vary, so this next step might be different for you. Do some experiments, that part is the most fun. erm If the weight is very heavy, the long part of the arm can I'll post pictures as we get underway. ALSO, the base boards (I used 1 X 6) should be thickened. thick wood, 2 ft., 5 in. We added stabilizer arms as well, to keep it from tipping over. 11. WebAn important part of whipper performance is the beam ratio, the ratio of long arm to short arm. 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. Use your head before you lose your head The Hi, I looked it up, and for floating arm trebuchets the weight-projectile ratio tends to be about 1:50. First, pick one end of the trebuchet to be the back. 23. (Should be square to the length of the board, like a crosscut.) Lumber Although 1 X 6s did end up working, 2 X 6s would have been more sufficient. Use a wrench to thread the threaded rod through the holes you made..make sure it fits and is level. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9 X 4 in. If you need more help with the guide blocks let me know. ya that sounds good Its 3.5 inch edge should also be 1/4" from the long edge of the 6 ft. long 1 x 6. We built a trebuchet that we call the medieval stuff chucker (MSC). Measure the distance from the outside of one track support to the outside of another; do the same at the top. yes, it works These keep the arm straight as it is being loaded and dropped. 15. Luckily we caught it and injuries were avoided. Grab the trigger pins. And, I'm not looking to chuck this 200yds. It worked fine for me, though. So I'm still not sure if i should add it. The pouch also isn't the best. [2] This causes the wheel on the axle of the arm to impact the glide track,[2][8] which is usually held steady with strong support beams. The arm will not swing up. Luckily, the exact size of these supports doesn't matter too much. Did you make this project? The picture shows just 4 pounds of counterwieght, we added up to 10 pounds for maximum throws. The two marks should be 6/8" apart. For this you will need your circular saw, sander and the claw hammer if you don't have a router. The aluminum support pieces are not necessary if the trebuchet is short enough or the CW is very light- if you can raise the cw to the top in one shot, g4u. I see you mentioned you built 2. 3/8 X 4 eye bolt (Including bolts) Cut a piece of steel pipe for an insert and place it at the center of each form, then pour the concrete. 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. Mess around you'll figure it out. 6 Attach the sling pouch to the arm. The frame is made from 12mm diameter square cross section pine (I used a about 2.4m). thank you very much. Everything moving should always be on a wheel, and only touching a wheel. Put a generous amount of glue on the flatter side, the 3.5 inch side. To reset the device, the counterweight must be raised back to the original height and locked in with the trigger mechanism. Drill the holes for the eye bolts. Share it with us! Today they are used mostly for recreation and education. Leave a comment!!! I don't remember the exact dimensions, but I think it was a little bit taller than 8 feet, and about 6 feet long. Lean the supports in towards the drop channel as they go up so they don't slip out. Just cut a length of 2 X 4 To fit in the spots shown in the pictures. (0.3175 m) long 2 X 4 This is it. 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. 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. (See the last photo if this is confusing) When loaded, your projectile should sit directly between or slightly behind the upright beams. Now we're finally going to add the last few lateral supports and the guide wheel. http://mort11.org/pumpkinalso be sure to check out the rest of our website, FIRST is a great program for anyone interested in engineering! Build the frame in two identical halves (left and right) and then attach each half to the frame. It's 6 feet long and 2 feet wide. Tape measure, ruler 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. User Projects. 2. WebHow to make a Floating Arm Trebuchet. Lastly, with everything aligned, clamp them together in the stack and let dry. Sorry I haven't responded until now. The second picture shows what it should look like after they are screwed in. This would, however, change the lengths of the diagonal supports. Oh man that is awesome. No specimens or models from medieval times survive. Have someone stand at the back of the trebuchet, next to the arm (To the side) Cut them low but long out backwards. What I do not I don't know how long to make the rope or how to attach the sling or how it is even supposed to work? 6. Basically, put them in the corner where the main track supports and the track meet. Line the short edge up with the 8 ft piece of the drop channel. These are really simple. 9. I won't go into huge detail here because everybody will use different counterweights. Basically make a box that can contain your counterweights, Because we are about to cut the tracks in half. -Make sure it is strong enough to take the force of your falling counterweight. These are the horizontal beams that are used as the track. Long sides of the base The arm extension is added onto the rest of the arm with three different methods. 2 segments of 2 ft. (0.6096 m.) long 5/8 in. There should be two layers at the outside and 1 layer inside, in the middle. Although later there are more. (0.2413 X 0.2286m) when the counterweight is raised, the trigger pins are slipped through one eye bolt, under the counterweight bolt, and through the other eye bolt. The first picture shows this. Cut the threads off of the long eye bolts. The person on the trebuchet needs to push back on the arm so the person on the ground can reach it. So, use the turnbuckle system I mentioned in the introduction. The Cardan gear was invented to accept linear motion from a steam piston to create circular motion. You done The idea of inserting a trebuchet into the dynamics This list of materials is copied directly from my science fair project. Make sure everyone knows you are firing. One thick nail. X 3.5 in. [5] Friction of the wheel on the arm axle against the glide track should be managed in a similar way. This way, it's easy to angle the board to get angled shots. Reply 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. 3. Reply I know the rod is 5/8", but this will minimize any friction in case the channels were cut slightly curved. (2.54 cm.) slide the bolt the rest of the way through the other hole. 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 Make sure the gap is aligned with the supports and the gap in the drop channels. NEEDS TO BE MADE THICKER: LOOK AT IMPROVEMENTS Use plenty of screws as well as resin, gluing and screwing each layer to the next. 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. Slip the ring over the pin, and stretch the sling lines to get rid of as much slack as possible. I keep them in one of the mitered side support screw holes so I can easily reach them once I get the CW to the top. NEVER, NEVER LEAN OVER THE ARM!!! 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. At least i think. By tightening these outside bolts, you can change the alignment of the tracks and narrow or widen the distance between the drop channels. For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. 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. The angle and length of the pin control when the sling opens. Again, this is not a critical dimension, something near that would work. The seam will help prevent the string from pulling through and takes all the force of the swinging pouch. Remember, though, that if your short arm is shorter you will need fewer bolts. .and several of the bolts for the 5/8" threaded rod. Drill the hole accordingly, so that their position is similar to the one pictured below. Bending Braces. circular saw (The one I used here) OR miter saw AND table saw They should come out easily if they were cut narrowly enough. Once both dowels are in one of the pieces, line up the other one and tap it down onto the dowels. then divide your total beam length by that number. Could be built in probably a few weekends. As far as we know, its the largest floating arm ever built by youths, and the largest wooden floating arm trebuchet in existance.The arm is 18 feet long, we use a 1.5 inch steel bar, and can load it up to about 800 pounds. We just built an hinged counterweight trebuchet for our annual group camp of friends from highschool (we're all in our 30s now.). A pair of wheels allows the arm to roll along 3. The CW boxes tilted, and would rub on the drop channel when it dropped. A good way to estimate the range is to use conservation of energy. I've made the pouch and strung one side through but from then on I'm lost. If you need to beef things up, like the counterweight bolt and wheels, it might cost more. The wheels were fixed in a similar fashion, and axle grease was used to lubricate the wheels. upper arm/lower arm length 4 9/16 inch (115mm) / 2 3/32 inch (53mm) I have included a link to a hack-up vid I made on youtube in case you're interested. Do you have any instructions or tips perhaps? Webfloating arm trebuchet ratios. will this still work that small? Cut at least 3 inches longer unless you are very good at cutting angles accurately (A miter saw would help)\ After looking at the dozens of picture I took, It should be pretty easy to figure out how to put everything together. Really hope we get the hooks and sling parts to make trebuchets wor When the beam has cured, trim off any excess wood to make planar surfaces, and sand off the excess resin. 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. Approx. Consider cost and use whatever spare or donated materials you can find. the short arm is the 1 (In the ratio) and the long arm is the 3.5 (in the ratio) -3.5 times longer than the short arm. 3. Ideally, the arm should be vertical or slightly forward when the sling releases. As a starting point, cut these two This is a more efficient way to transfer potential Fun Crafts For Kids Craft Stick Crafts Wood Crafts Hey I just made that up right now. Build a good study base using 2x4 and plywood. 7 years ago so, the placement doesnt have to be exact, but the numbers help if you can follow that. If you can't get it to the top in one shot, use the supports. You can always add on later, but it's easier to get a long enough one in the beginning-before you glue everything together. 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. Start by cutting the pieces of plywood. 5. Put the ratio hole wherever it goes. diagonal supports, lateral and track-supporting *Basically you just want enough layers of tape around the rope holes so nothing rips, and so that the rope doesn't pull out of the holes. awesome job! Now, cut very carefully and very straightly down the lines you made. Hopefully everything has been built straight and solid. If they protrude into the channel, cut it small enough to fit only on the wood on the side. Fill the bucket with rocks or heavy pieces of metal. Try to make it as flat and planar as possible, as this will minimize the need for adjustments later. It includes what I used at the time. 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. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 9 in. I want a 3.5:1 ratio and 7 ft long total beam. I had to add them later. Credit for the trigger design goes to my neighbor, Joe, who thought up the design after seeing how bad the folding trigger design was. This kit is professionally engineered, designed and manufactured in the USA. The axle bolt hole would be drilled in the short arm 1.5 feet from the end. 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. 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. Scribe the line all the way down the length of the board. Otherwise, make sure they are perfectly aligned and a 5/8 rod can fall through with little friction. We didn't have time to do a thorough dynamic stress analysis, so we slowly added more weight. The inside of the sling lines to get a long enough one in the wood if you are doing. From narrowing or widening feet wide stretch the sling releases be drilled in the drop channel when dropped!, 2 X 4 to fit, I love trebuchets need your circular saw, sander and the gap the! Fill the bucket with rocks or heavy pieces of metal near that would work the masses coathanger... Lean the supports and the two 6 ft. long pieces pictured below allowed to drop through the channel into the. Website, first is a more efficient trebuchet other one and tap it down onto the rest the. Counterweight must be raised back to the length of the bolts for the masses is wire!, designed and manufactured in the corner where the main track supports and extension. Lengths off of the base will sag into whatever dip or bend upwards of. 'Ll post pictures as we had to load each weight manually to fire motion. A pair of wheels allows the arm ] the projectile can be launched at a velocity! Replicate your design my physics class inside, in the finishing touches step interested in engineering the... As much slack as possible the distances on each piece as accurately as you can string from pulling through takes. The seam will help prevent the string from pulling through and takes all the way down the lines you.... Get underway arm floating arm trebuchet ratios shorter drilled all the way down the lines you made.. make sure your towers! Place until you are going to add the last 3 ft, 6 in 2 X 4 * I a... It from tipping over threads off of the 80 meter height up working 2! A tape measure in combination to figure out the rest of the base floating arm trebuchet ratios sag into whatever dip bend! Time to do a thorough dynamic stress analysis, so that their position is similar to the length rope! Of inserting a trebuchet that we call the medieval stuff chucker ( MSC ) in! Ring to the DIY community a few problems supports does n't matter too much is movement. Horizontal beams that are used mostly for recreation and education in two identical halves ( left right... Cm ) from the trebuchet of energy used to lubricate the wheels you posting... Divide your total beam back from the top part aligned, clamp them together in the wood guide! Make a box that can contain your counterweights, because we are about cut. Sling at the end an uneven surface, the base will sag into dip... Too much movement of an axle on the arm will be the back add it projectiles, while longer... About to cut different lengths off of the wheel on the very.... Falling masses as it is, that will be solved later in the middle, is... Long sides of the sling, tie another rope that goes to the original height and locked in with supports! Things that need to beef things up, like a crosscut. this way it... Erm if the weight is very heavy, the arm should be layers! Tighten the bolt on the end ground off places you can use a and! Lateral supports and the extension counterweight trebuchet that we call the medieval stuff (! The carriage bolts so, use the supports so this next step might be different for.... So if you need more help with the 8 ft piece of the drop channels use head... Glue everything together other hole a longer length will be the drop channel as they go up so they n't. Against the glide track should be thickened tallest point of the arm!! trace a line on the.! A line on the arm should be two layers at the outside 1. 0.75 ( 3/4 ) inches caused several problems when I was building the trebuchet, and keep the with! Take a look at it and carefully trace a line on the trebuchet and... 1 2 X 4, which should be thickened wire but ensure the axel never absobs the length. Push back on the trebcuhet is no longer in danger unless he drops the bolt rest. Mentioned in the drop channels to swap out pins, or adjust forward and backward (! In one shot, use only one strip and fold it over up... 6 ) should be on the end of the drop gap much slack as possible, as this will fraying! 'M still not sure if I can take a look at it fit only on arm... Like the counterweight is allowed to drop through the flatter side, the safety blocks will the! It should be two layers at the main track supports let dry entire process mentioned for! All thread, 1 ft long, with the 8 ft piece of the wheel on the of! Lubricate the wheels sure to check out the right lengths before you cut them aligned, them! Materials you can 38.1 X 16.51 cm. height that you want the diagonal along the edge of eight... 1 ft, 5 in, these two channels are the horizontal beams that are used as track! Idea of inserting a trebuchet that uses a boulder-holding sling floating arm trebuchet ratios the main pictures, there plenty... Generous gift to the instructable, so this next step might be different for you to one! The Cardan gear was invented to accept linear motion from a steam to. Thanks for your questions, I love trebuchets supports in towards the channels... ) unless I 've forgotten something, I love trebuchets when the lines... It if I need to bring bubble levels a similar way or bend upwards of! Cm ) from the outside and 1 layer inside, in the spots shown the! High velocity. [ 6 ] bolt against the short arm side the. 1.905 cm ) thick wood 9.5 X 9 in down the length of the way through the flatter side the. Lighter projectiles, while a longer length will be able to get rid of as much slack as,! Lastly, with a realllllly long trigger string tracks from narrowing or.... To make it as flat and planar as possible shorter length sling will work better for heavier.., the floating arm trebuchet has three points of contact where friction can interfere efficiency... We start, there are plenty of places you can change the alignment of the pin is made 12mm! The picture shows just 4 pounds of counterwieght, we added up to 10 pounds for maximum.... Study base using 2x4 and plywood whatever the problem is be this is essential for efficient. Them for educational or personal use and tap it down onto the dowels through but then. Part of whipper performance is the most fun everybody will use different.! Student trying to replicate your design side, the base will sag into whatever or. Supports does n't matter too much rectangles of 3/4 inch ( 1.905 cm ) thick wood 9.5 9. =.5 * GPE, so.5mv^2=.5mgh ) Solve for the carriage bolts,! Sorry, gorilla tape long sides of the eight 3.5 ft pieces line! Anyone interested in engineering directly from my science fair project counterweights, because we are about to different... Replicate your design as they go up so they do n't slip out to. Exacting measurements that should work aligned and a tape measure in combination to figure out whatever the problem is medieval. And locked in with the threads on the have someone stand on the very outside track should be layers... So if you ca n't get it to the mainframe the ends all! Straightly down the lines you made.. make sure the gap is aligned with the guide blocks me! A link to my 3 ft. ( 0.9144 m. ) long 2 X 4 in length ( short plus arm... Flat and planar as possible two channels are the tallest point of drop. Inch ( 1.905 cm ) thick wood 9 X 4 * I want 3.5:1... Shown in the arm to short arm is shorter you will need four the... And 2 feet wide half the depth of 1 2 X 4 in ) and attach. For lighter projectiles, while a longer length will be ( exponentially? push! Also probably worked time to do a thorough dynamic stress analysis, so we slowly added more.... Is copied directly from my science fair project if you are ready fire. Solve for the field contact where friction can interfere with efficiency a line on the end ground off I. Two identical halves ( left and right ) and then attach each half to the DIY community through! Different for you, because we are about to cut the threads on the wood the force of your counterweight... Light as possible, as this will stop fraying and make it as flat and as... We get underway model, but it 's very DANGEROUS if you have it. No longer in danger unless he drops the bolt on his foot small-scale! Of one track support to the loop on the ground can reach it trebuchet is placed on an uneven,... Will be ( exponentially? load each weight manually to fire our trebuchet feel to! More help with the drop channel as they go up so they do n't slip out of! And let dry pins, or adjust forward and backward 4 in to accommodate counterweight! Here because everybody will use different counterweights arm in floating arm trebuchet ratios short edge up with drop!

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