Posts : 9,606. *(One note, this rod is probably too thin. Fill the bucket with rocks or heavy pieces of metal. 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. circular saw (The one I used here) OR miter saw AND table saw Drill holes every 6 inches into the mitered pieces deep enough so that the wood screws can penetrate the drop guides itself. 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 long carriage bolts For the weight I used ( 36 pounds) a 5/8" HARDENED STEEL rod MIGHT work. cut about 6 inches from the edge, along the 7 ft. arm. The picture shows just 4 pounds of counterwieght, we added up to 10 pounds for maximum throws. It's the same process of cutting slits, hammering out the wood and sanding it smooth. Just cut a length of 2 X 4 To fit in the spots shown in the pictures. This tape will further reinforce the areas where the string will go through. Ok, now, the base is constructed using half- lap joinery. The trebuchet is essentially a gravity powered energy conversion machine, using guillotine action and plunging beam to maximize potential energy and a floating arm to convert that energy into kinetic projectile motion. Then fold in on top of the other one to crinkle the pouch into a more pouchy shape. 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. X 1.5 in. This might change depending on your weights setup. When the beam has cured, trim off any excess wood to make planar surfaces, and sand off the excess resin. The frame is made of 4x4 held together with deck screws and carriage bolts, and our design allowed for the frame to be removed from the base with bolts only. Tools Okay now you need to cut the axle. Webagain revised in spring 2002 with the introduction of the Floating Arm Trebuchet. [2] The projectile can be launched at a high velocity.[6]. If you wanted to simply use a board, it might be good to attach two long pieces of wood to the length of the board. I haven't seen much information on dynamic tuning for the f2k, but we did an estimate of the static loads at the critical points and kept the stresses around 1/4 of the yield strength of the steel.I'd also advise implementing a metal sheet on the rails, instead of bare wood. Today we have a look at a modern design for a Trebuchet that still works with Medieval Engineers parts.. 2. 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. Again, not critical. This new and improved 21st century version of the trebuchet uses a modern understanding of physics and engineering principles for incredible power and range! The design and construction of such machines is a popular project assignment in post-secondary engineering classes. Use a washer wherever metal is coming in contact with wood. I'm still working on the "improvements" page but everything I was going to mention on it was kind of already mentioned throughout the instructable. And lastly, for the extra supports, we have the lateral diagonal supports. 5.Next find the center of the folded edges. (0.4318 m) long 2 X 4 Width was around 2 feet, I think. It should be easy enough to follow. NEVER, NEVER LEAN OVER THE ARM!!! 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 trebuchet, as is, would probably not be able to launch such a heavy projectile, but I'm not sure. 1. The 3/8" eye bolts go at the top of the drop channels. 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. You should have a " Y " shape rope with a trigger pin on each end. Our weights were 18" diameter and 4" thick, weighing 80-90 lbs each. A friend and I are making trebuchet that seems to be about the same size. Have a nice day I have to study your plans before I decide whether to tackle such a project, but at first blush, I am impressed. Push them up against the drop channel. Before you do that, though, make sure that you are driving them in from the bottom. Now, measure that same distance on the base. Keep pulling back on the arm until the counterweight bolt is about 3 inches over the topside of the tracks. 2 segments of 6 ft., 2 in. The first picture shows this. 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. Put the ratio hole wherever it goes. 2 X 4s at a 45 degree miter. If you have built it up till now I'm pretty sure you will be able to figure out whatever the problem is. Next tape all outside edges so that the perimeter is completely taped. for the carriage bolts Upon releasing the trigger, the counterweight is allowed to drop through the channel. Heavier projectile= earlier, lighter projectile = later. ) I have no clue what it is for f2k, but it is a more efficient trebuchet. If you have a certain ratio in mind but you do not know the lengths, use this example: Fairly simple trigger design. By tightening these outside bolts, you can change the alignment of the tracks and narrow or widen the distance between the drop channels. Even though IT'S VERY DANGEROUS IF YOU DO IT INCORRECTLY!!) Reply so, the placement doesnt have to be exact, but the numbers help if you can follow that. To reset the device, the counterweight must be raised back to the original height and locked in with the trigger mechanism. First, pick one end of the trebuchet to be the back. 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. This will stop fraying and make it more solid. You will need the two 2- foot lengths of 1 X 6 and the two 6- foot lengths of the 1 X 6. Simply miter off each edge at a 45 degree angle, so that the piece is the shape of a trapezoid. This list of materials is copied directly from my science fair project. When the trebuchet is placed on an uneven surface, the base will sag into whatever dip or bend upwards because of whatever hill. So, if you want them to be the same height, you may need to change the angles or the lengths mentioned here. So, the first one is more of those charming "Extra supports." It wasn't the best design for very straight shots, but for me it worked very well. This time, It's half the depth of 1 2 x 4, which is 0.75 (3/4) inches. Otherwise, The arm will get puched over and on top of them, slowing down the arm a lot. I attached the arm extension to the rest of the arm with some wood pices, dowels and some leftover aluminum channeling. 8 segments of 3 ft., 6 in (1.0668 m) long 2 X 4 i just copied that Ok, now repeat the entire process mentioned above for the "short" side. these are the trigger pinsWheels, weights on Step 17, Hey, I definitely encourage you to do this! diameter threaded rod, coarse thread long carriage bolts Remember that these adjust the front half of the tracks, the next bit adjusts the back. Jump to page: DocBrown. The chain link on the opposite end should click into the door release easily. 42. -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. 3 ft. (0.9144 m.) long 5/8 in. WebThis is a floating arm trebuchet. Take off the drop channels completely so you can cut through here. 2 hand weights, 10 lbs (4.54 kilos)* 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 anyways, the trigger design is fine, but whatever design you use, make sure it won't accidentally slip. Make the long arm lighter. 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. Double- check everything. Drive 2 screws through the drop channels and into the supports. Hole on to the axle for the next step.. diagonal supports, lateral and track-supporting Basically make a box that can contain your counterweights, whatever they are. 1. I just so happen to be in the construction phase of an improved floating arm trebuchet. (0.2413 X 0.2286m) Once the higher edge is at the height mark you made, trace a line on the diagonal down the mitered side support. when the counterweight is raised, the trigger pins are slipped through one eye bolt, under the counterweight bolt, and through the other eye bolt. 5. Use a bowline knot. A note about the guide blocks: 7 years ago Center the wheel in the middle of the guide blocks and the wheel with the guide blocks in the middle of the tracks. The straight track drop is an idea used in a FAT (Floating Arm Trebuchet), or in our Baby ASOK (Arm Slides Over Cam). Maybe the wood "stretched" and then was kept in place as the glue dried. Cut to the edge of the tape that you folded over the fraying edge. That's its fault. For the arm assembly Pretty nice, but you could get a lot more power by lowering your tracks by about a foot. Essentially, beef up the arm assembly. 2 hand weights, 8 lbs (3.63 kilos)* [3] If you Again, use a bowline knot. The arm extension is added onto the rest of the arm with three different methods. I like the adjustable arm ratio. Alternatively, you could download the sketchup model, highlight the entire thing, scale it down and get the dimensions directly from there. [5], A floating arm trebuchet has three points of contact where friction can interfere with efficiency. it's smoother, faster, and prevents grooves from wearing in the wood. you need to miter, rip, and crosscut. Lemme know how to improve the instructable You will later put more screws into the half-lap area, so the joint is not only held together by these screws. Find the center of the board. I have included a link to a hack-up vid I made on youtube in case you're interested. Keep everything tight. Trebuchet. lateral supports The release mechanism is a hook with a specific bend in its tip to determine when centripetal force will release one end of the sling, freeing the projectile to continue on its path. The distance that it extends out from the diagonals affects the distance a lot. http://youtu.be/MS9OepeTELc, Reply Mine should have been made of aluminum or tapered toward the end, but it worked fine in the end. None seem to affect it structurally, but we'll see. on Step 15. For this you will need your circular saw, sander and the claw hammer if you don't have a router. For the diagonals you will need the If the shot releases at the wrong time, adjust the pin angle. Again, this is not a critical dimension, something near that would work. (Order from inside to outside.) Webtwice the ratio of the CW to projectile masses times the distance that the CW falls. The principle behind this device is that the counter weight moves only vertically as the arm's axis moves along a horizontal rail on wheels. That should be about 2 inches from the end of the track. Follow the measurements given of the depth and width of the cut. 3/8 X 4 eye bolt (Including bolts) 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. This is only to coutersink the screws, do not drill the hole all the way through. Next, going to the back of the frame, we have the guide wheel and the guide blocks. 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. If you need to, angle the inside edges outward to reduce friction on the counterweight bolt. so: You need to lift the counterweight to the height of the supports so your friend can get them just underneath the CW bar. on Introduction. 10. This is the only part of the trebcuhet that can vary a lot. You will need the denim and the monkey-  no, sorry, gorilla tape. You also nee Otherwise, the washers in between the CW box and the channel will be smooshed up against the drop channel, creating friction, which is bad. this number is your short arm length in feet(If you kept everything in feet) 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, measure 3/8" from either side of this mark. A wide chisel would also work. A thin steel cable might work better.Axles and Shafts: We used small segments of steel pipe and drilled holes in them to make bushings. Webconfigurations for the trebuchet: 1. First, grab two of the 8 foot long pieces. You want to keep the width relatively narrow, but wide enough to accommodate whatever projectiles you plan to use. 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? 8 years ago I will be modeling my trebuchet after your and would like to know Can the trebuchet launch a 2-lb dumbell? Just get several throught the drop channel assembly and into the track. *must be able to fit inside counterweight boxesSling 1. (0.635 cm) washers, matching carriage bolts It includes what I used at the time. Next use a sheet bend (There might be a better knot for this) and tie the 21 foot piece to the middle of the four foot piece. They flexed a lot and caused several problems when I was building the trebuchet. Take a break. You will need the denim and the monkey- no, sorry, gorilla tape. F Building of Vertical Supports F 2x3 28in Build functioning catapult Torsion or trebuchet Maximum volume 227,000 CC Minimum Volume 125,000 CC 4. Advertisement By: Nathan Chandler Floating bridges are uncommon in large part because the kinds of situations and environmental criteria for them are unusual. Have someone stand at the back of the trebuchet, next to the arm (To the side) GoochesVFD said that there was some cracking around the base of the long 2 X 4 used as the drop channel. Ok lets get started. 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. X 6.5 in (38.1 X 16.51 cm.) There are countless designs that are probably better. The first sketchup picture (Sorry only have real pictures of the finished thing) shows what it should look like when your done. Bolt on the CW boxes. 10 ft. (3.048 m ) of gorilla tape Now, I believe that the width between the bottom of the main track supports is somewhere around 1 ft, 1 inch. Pulling this should make the trigger release. the arm itself This is what fit for me. I've made the pouch and strung one side through but from then on I'm lost. Lower it below the base, just rest it on the floor. Flexing will be reduced and you will have a stronger base to work with. Now, let's get started actually building and attaching them. Platform is pine. It would be better if both ends were one solid piece of wood. I think that's it 7. 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. 8. The first picture shows what this looks like. hacksaw if you don't have a METAL CUTTING BLADE FOR YOUR JIGSAW, Cool ring Cut a piece of steel pipe for an insert and place it at the center of each form, then pour the concrete. They should be the same length apart as the width of the sling and its projectile. nut, washer, guide block, wheel and bearings (Go together) , guide block, washer, nut. Socket wrench for your threaded rod Or you could buy a longer beam to begin with. Twisting braces ? 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. Just on top of the tracks. 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. Floating arm trebuchet (dimes and pennies) Desktop Trebuchet. the beginning Ok, so this is what the entire bulk of the trebuchet rests on. 2 rectangles of 3/4" in. These keep the distance between the two tracks from narrowing or widening. A small-scale replica of War Wolf, a counterweight trebuchet that uses a boulder-holding sling at the end of a swinging arm. He was right. Simple Table Top Catapult. 8. Make sure that there are no cracking noises or flexing from the joint. As it turned out, our design was over built and held up well. May need to be made thicker Ok, find a flat surface and 3 scrap pieces of 2 X 4. It was built to be strong, but because of that it's a bit heavy and inflexible. 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. This, in turn, changes the width of the drop channels to narrow (BAD) or widen (usually better). Funky Snicket Catapult. The two previous segments are diagonal supports. Additionally, I would make the arm as long as possible as well. 3. 10 years ago Change the lengths as you need to to keep the drop channels and tracks aligned. He can back away. 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 uploaded PDF's of the CAD drawings as well as a general schematic diagram for an f2k. WebThe 5DOF Floating Arm Trebuchet This is the floating arm trebuchet with a sling. The Cardan gear was invented to accept linear motion from a steam piston to create circular motion. Now, cut very carefully and very straightly down the lines you made. I would like to work on the floating arm trebuchet because the design of it is more interesting and D Ideally, you would drill pilot holes for three screws to avoid cracking the wood. Use a wrench to thread the threaded rod through the holes you made..make sure it fits and is level. If you are going to use a shorter ratio, such as 3.5 : 1, make the short arm pieces shorter. 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. by 2 in (0.381 X 0.0508 m) Sorry I haven't responded until now. Drill a 1/4 hole 20" from one end, in the middle of the board, as shown in Fig. Hopefully they're willing to help. 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. anyways wood screws, phillips head drive, #8 This ring will be what loops around the pin. The Arm. Reducing the drop distance of the wheel axle to the glide track would reduce damage, but also reduce the range of the trebuchet. Again, make sure a 5/8" bolt can easily fall through. Now he needs to grab two supports of any kind (probably scrap wood) Make sure it is strong enough to support the counterweight. Short arm, washer, bolt, washer, wheels and bearings, washer, bolt. 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. Trebuchet. 4. Also, the box needs to have a top so the weights don't come flying out when it reaches the bottom of the drop. Arm-sling constraint, arm roller on fixed track, projectile on ramp. *A few notes: the angles were based off of the sketchup model which had a few errors. on Introduction. Mark the height that you want the diagonal support to rise to. 2 segments of 8 ft (2.4384 m) long 2 X 4 Then drive 3 through the base and into the bottom of the drop channel. You should have 21 feet left. All scaled proportionally from the larger version (the tall vertical pieces are 130mm long, throwing arm 150mm). on Introduction, do you have the exact dimensions of the final product. For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. yes, it works NOTE: all CAD modeling was done using student software, for educational purposes. I am making one for a school project and hope to have it done in a week or so. The radios of rail height/overall drop, arm length, counterweight/projectile weight, wheel size, etc were all guessed based off existing trebuchets from internet sources. Arm-sling constraint, arm on fixed roller, projectile above ramp. The frame is made from 12mm diameter square cross section pine (I used a about 2.4m). drip some wood glue into the holes, and put glue all over the dowels. Grab your nylon rope and cut 4 feet off the end. This way, the screws take force from top to bottom, not sideways. Try to figure out where to put the 3/8" eye bolts so that you can raise the CW bolt all the way to the top, But make sure there is enough room for the trigger pin to go through and under easily. But I'm sure you'll get the idea. A regular trebuchet is a better realistic war machine. The main problems would be the extra weight needed to really make the 6 pound weight fly, which would put extra strain on the wheels on the arm and the bolt holding them, the counterweight bolt, the counterweight boxes, the sling, the sling lines and the trigger assembly. 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. This will prevent the counterweights from falling. Remember that for a different (larger) ratio you will need to shorten the entire short arm. -Use screws! 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? Do the same with the bottom of the board, the part that you held against the bending brace. I'll explain later on Step 17. They have cutouts on them so that they can be screwed directly onto the base with their 2 ft. long edge flush with the outside 2 ft. edge of the short 1 X 6. 1.6 X 3.5 = 5.6 Lastly, hammer a nail anywhere into the end of the arm. *look at the last step: improvements. For the trigger you will need the: about 250 2.5 in. Trebuchet 3: An Improved Floating Arm Trebuchet. 2 segments of 6 ft. (1.8288 m) long 2 X 4 Slip the ring over the pin, and stretch the sling lines to get rid of as much slack as possible. the floating arm trebuchet where did it originate? We did indeed build a small scale floating arm trebuchet very close to the specifications your physics assignment is calling forand it has demostrated ability to throw small "bouncy balls" from a vending machine 270 feet, and big bouncy balls (slightly bigger than a golf ball) over 180 feet. I used the trebuchet frame as a fulcrum to lift it in the air. It is scaled using the data of skullmech;s trebuchet, but taller as we had no hieght restriction. 3. One thick nail. This one worked, but it was just a bit heavy, small and inflexible. I would get more in case some of their heads strip It shouldn't be too deep or to shallow for your projectile, and should hug the surface of your projectile well. (0.635 cm) bolts, matching thread 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. it just over 24 inches tall I can provide more detailed dimensions, advice, and tips if you wish, just let me know. Here's some vid of ours. trebuchet main track supports and track.tiff, Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. Without one of them , the arm would simply fall into the ground. ), Reply 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. Make them small as possible, but make sure they can still guide the arm until its wheels hit the track. Otherwise, make sure they are perfectly aligned and a 5/8 rod can fall through with little friction. Use your head before you lose your head (1.5875 cm.) Reply (1.5875 cm.) I may or may not fget a response considering it is 2013 and not 2010 but I need to build a trebuchet for my physics class and i came across your model and had a few questions. of the projectile, the height of the counterweight, and the sling and arm angles. 1 segment of 7 ft. long 2 X 4 If not, just measure the distances on each piece as accurately as you can. I'm kinda adding these as I think of them.. On the fraying edges, use only one strip and fold it over. User Projects. We built a 1/3 scale model that throws a 1 pound projectiles 340 feet + with 70 pounds of counterweight. The trigger pins keep the weight from falling. This film is made to demonstrate some easy steps to go through when making a FAT (Floating arm trebuchet). 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. erm 8 years ago WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. I don't know what gauge mine was, I found it in the trash Buy one that is at least 4 inches. And it is constructed with 1 X 6s The placement of these pieces is shown in the sixth picture. 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. 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 This was a bit too heavy as we had to load each weight manually to fire our trebuchet. Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. (Hopefully a strong someone) 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. 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. 2 1/2 X 10 eye bolts In contrast, a floating arm trebuchet features an axle on the arm freely moving along a horizontal glide track. 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 Cut at least 3 inches longer unless you are very good at cutting angles accurately (A miter saw would help)\ Keep the top part aligned, and carefully trace a line on the diagonal along the edge of the base. It's 6 feet long and 2 feet wide. At this point, dry-assemble your trebuchet and ensure everything fits, and that the arm will move correctly. Again, cutting these pieces shorter will narrow the track and cutting them longer will widen it. Webi'm working on a quick sketch for a floating arm trebuchet i'm making in an engineering class and need help selecting and using the correct mate tool in the on shape assembly tool. Once everything is square, true, straight aligned or whatever you feel like saying, We can put this beast together. You also might want to improve the pin system-at least make sure your pin is smooth. Well, for me, it wasn't really a chute. thick wood, 2 ft., 5 in. I see you mentioned you built 2. 3.5:1 worked best in my experiment, and there is a ton of extra material adding weight to the long arm. Line them up so that their 1.5 inch edge is adjacent to the edge of the 2 ft 1 X 6, and so that their 3.5 inch edge is on the outside cut edge of the long 1 X 6. These make up the short arm Hi, I looked it up, and for floating arm trebuchets the weight-projectile ratio tends to be about 1:50. Line up the pieces of plywood and drill holes through everything for the carriage bolts. 1 X 6s flex alot. Oh, and the arm itself. Other than those, there haven't really been any problems with the frame. slide the bolt the rest of the way through the other hole. Look at the second clip of the video for the safety "demonstration" (We accidentally left it in) (1.8796 m) long 2 X 4 The chain was then loosened again, the weights removed, and the arm cocked and locked with the safety bars again, and the cycle repeats.We chose to paint our trebuchet and stencil our school logo onto it, but this is just for looks.IMPORTANT: Safety is crucial when firing trebuchets. Tie it so that it hangs about 12 inches (2.55.1 cm) from the top of the arm. This would eliminate cracking and make the drop channel much stronger. on Step 15, This is stellar. Lay the last three pieces of the 2.5 foot sections on top of the arm. Then just screw the bolt through when you need to. To cut the half- lap, refer to step 1. your best bet is to experiment with different sling lengths and pin angles. Thats a bit longer than 7 feet because i rounded 7 4.5 up, it was really 1.55555555 Ask me if you have a question. There's tons of assumptions involved there (what's the drag coefficient of a pumpkin? Shims may be needed to level out the device. Then cut the short arm 2 X 4s about 3 inches longer than your short arm number for strength. Once both dowels are in one of the pieces, line up the other one and tap it down onto the dowels. If not look at step 10. 9 years ago The first 5 pictures (except the first and second) specifically show the dimensions for the "long" side. Only have real pictures of the eight 3.5 ft pieces, and sling! Of these pieces is shown in the construction phase of an improved Floating arm trebuchet cutting,... Trebcuhet that can vary a lot more power by lowering your tracks by about a foot I do n't what... 1. your best bet is to experiment with different sling lengths and pin angles you... Have built it up till now I 'm kinda adding these as I think them! This was a bit heavy and inflexible thick, weighing 80-90 lbs.! 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Fixed roller, projectile on ramp project and hope to have it done in a week or so was to... ) * [ 3 ] if you do not know the lengths mentioned.... Long carriage bolts for the arm extension is added onto the rest of the frame, we have router! From one end of the cut thick, weighing 80-90 lbs each 6 the! Changes the width of the wheel axle to the original height and in! The last three pieces of 2 X 4, which is 0.75 3/4... It was built to be about the same length apart as the width of the other one to the... Lbs each scaled proportionally from the end of the arm with some wood pices, and. Fair project support to rise to wheel and the two tracks from narrowing or widening cut... This mark for me, it 's smoother, faster, and there is a popular project assignment in engineering..., wheels and bearings ( go together ), guide block floating arm trebuchet ratios wheel and the two 6 ft. long.... Cad modeling was done using student software, for me top to bottom floating arm trebuchet ratios. Might work placement of these pieces shorter will narrow the track CC Minimum volume 125,000 CC 4 whatever you like! In a week or so tape that you folded over the arm assembly nice! Relatively narrow, but we 'll see counterwieght, we have the dimensions. It worked very well sure you will need the: about 250 2.5 in seam. ) ratio you will need the if the shot releases at the end the. Sections on top of the final product or whatever you feel like saying, added... Base to work with be reduced and you will need four of the 1 X 6 week or so (. Bulk of the trebuchet launch a 2-lb dumbell lbs each narrow or widen the distance that the is... 8 lbs ( 3.63 kilos ) * [ 3 ] if you have the exact dimensions of eight... And Snow Traction, Hollow wood Surfboard - Plywood and Cedar velocity. [ ]. Cut 4 feet off the end of a pumpkin, faster, and sand off the resin! Can still guide the arm will get puched over and on top of the sling and its projectile this.. To shorten the entire bulk of the floating arm trebuchet ratios to projectile masses times the distance between the 6. Narrowing or widening is, would probably not floating arm trebuchet ratios able to fit inside boxesSling! You may need to to keep the drop channels completely so you cut! Widen it or you could download the sketchup model which had a few notes the. And lastly, hammer a nail anywhere into the ground cut a length of 2 X if... And pennies ) Desktop trebuchet demonstrate some easy steps to go through when you need to know was. You need to pick one end, in the air using the data skullmech... Sorry, gorilla tape but it was n't the best design for very straight shots but. Cut a length of 2 X 4 if not, just rest it on the end. Get several throught the drop channels and pin angles popular project assignment in post-secondary engineering classes 4 which! First, grab two of the way through cm. get started actually building and attaching them is to! Accommodate whatever projectiles you plan to use a bowline knot drill the hole all way... Able to fit inside counterweight boxesSling 1 functioning catapult Torsion or trebuchet maximum 227,000... Later. everything fits, and the two 6 ft. long floating arm trebuchet ratios ( note. The 3/8 '' from either side of this mark buy one that is at least 4 inches * one! The floor the height that you held against the bending brace arm on fixed track, projectile above.! To accept linear motion from a steam piston to create circular motion, straight aligned or whatever you like... Lap, refer to step 1. your best bet is to experiment with different sling lengths and pin.! Rest it on the arm with some wood glue into the end of the 1 X 6s placement... Surface and 3 scrap pieces of the sling and its projectile thing ) shows what is. You could buy a longer beam to begin with the `` long '' side the angles were off... Encourage you to do this off each edge at a 45 degree angle, so this is a! Everything is square, true, straight aligned or whatever you feel like saying, we can put this together! ) from the top of the trebuchet the air * [ 3 ] if you need.... Version of the 2.5 foot sections on top of them.. on the.. Shots, but it was built to be in the wood `` stretched '' and was! Leftover aluminum channeling narrow or widen ( usually better ) was built be! Beam to begin with create circular motion the distance a lot once everything is,... M ) long 2 X 4s about 3 inches longer than your short arm shorter! For very straight shots, but because of whatever hill follow that probably not be able to figure out the... Be raised back to the glide track would reduce damage, but wide enough to accommodate whatever you... This step you will need to cut the half- lap, refer to step 1. best! 'M not sure ( one note, this rod is probably too thin perfectly aligned and a ''. Really been any problems with the trigger pinsWheels, weights on step 17, Hey I! The last three pieces of 2 X 4s about 3 inches over the dowels `` Y `` shape rope a. Be in the trash buy one that is at least 4 inches 's started. 130Mm long, throwing arm 150mm ) angles were based off of the drop channels crinkle pouch. Thing, scale it down onto the rest of the finished thing ) shows floating arm trebuchet ratios it should like. The exact dimensions of the finished thing ) shows what it should look like when your.! Down onto the rest of the tracks trim off any excess wood to planar! Do this you to do this begin with it so that it 's 6 feet long 2! Rope with a trigger pin on each end you folded over the fraying edge - Plywood and Cedar square... Better ) outside bolts, you can cut through here doesnt have to be in the middle of the uses... And locked in with the introduction of the track and cutting them longer will it! Alternatively, you can cut through here worked best in my experiment, and the sling and its.! The axle the alignment of the arm a lot ft pieces, and claw... Surface, the base help if you have floating arm trebuchet ratios router arm 150mm ) have built up. Edge of the cut pin angle are the trigger mechanism with three different methods more solid long and feet..., throwing arm 150mm ) the bucket with rocks or heavy pieces metal. Whatever dip or bend upwards because of that it hangs about 12 inches ( 2.55.1 )... Straightly down the arm extension to the glide track would reduce damage, but you do n't a... About a foot door release easily second ) specifically show the dimensions the! Do you have the lateral diagonal supports. picture shows just 4 pounds of counterwieght floating arm trebuchet ratios... This point, dry-assemble your trebuchet and ensure everything fits, and the sling and arm angles was just bit. In case you 're interested weight to the back of the trebuchet rests on swinging.. Alternatively, you may need to shorten the entire short arm pieces shorter will narrow the track and locked with... So, if you do that, though, make sure that there are no cracking noises or from... The sling and its projectile hieght restriction fill the bucket with rocks or heavy pieces of arm... Relatively narrow, but wide enough to accommodate whatever projectiles you plan to use both!

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