Awesome trebuchet! 24. 7. (if you do it, let me know; I'll tell you how to make fireball projectiles), 7 years ago 1). wood screws, phillips head drive, #8 The CW boxes tilted, and would rub on the drop channel when it dropped. It has two ropes coming off it, one in either direction. You can always add on later, but it's easier to get a long enough one in the beginning-before you glue everything together. Webconfigurations for the trebuchet: 1. The person holding the arm up can relax. It shouldn't be too deep or to shallow for your projectile, and should hug the surface of your projectile well. Although the trebuchet will work so small, it might be better to increase the arm ration. then divide your total beam length by that number. i was hoping you could tell me what the release system was rated for and if you have any recommendations on where i can acquire a quick release, 8 years ago I would get more in case some of their heads strip Still, it was strong enough with all the gorilla tape. Mine should have been made of aluminum or tapered toward the end, but it worked fine in the end. 11 years ago Im going to try to attach an image of this fine litle machine if i canim not an expert at this. 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. User Projects. (0.635 cm) bolts, matching thread I used the trebuchet frame as a fulcrum to lift it in the air. 5.6 + 1.6 = 7.2. The bottom is the side where the 2 ft 1 X 6 overlaps the long 1 X 6. Slip the ring over the pin, and stretch the sling lines to get rid of as much slack as possible. So, cut the first twisting brace, on the very front, as wide or narrow as you need it to keep the drop channels straight. To reset the device, the counterweight must be raised back to the original height and locked in with the trigger mechanism. Floating Arm Trebuchet Page 3 of 3 First 1 2 3. When firing, make sure no-one is down range, near to, or directly behind your trebuchet. The uncut section at the bottom should either be left longer, reinforced or improved. This directly blocks the weight bar from falling while loading the trebuchet. Trebuchet. drill (The one I used here came in a kit here) with a varied drill bit set, for pilot holes, etc. Take a look at our trigger design if you ever want something that works for heavy payloads. Drill a hole somewhere near the end of the armit doesn't matter, but it should be at least 3/4" from any edge. If the shot releases at the wrong time, adjust the pin angle. nails will slide out of the wood, and will not keep the box together. Short sides of the base Since one is steeper than the other, this meant that the vertical height ended up different. It's the same process of cutting slits, hammering out the wood and sanding it smooth. *It would be better if the two previous 1 X 6 pieces were 2 X 6, I'll explain later. This time, It's half the depth of 1 2 x 4, which is 0.75 (3/4) inches. (0.635 cm) diameter, 5.5 in. Hopefully they're willing to help. Start by cutting the pieces of plywood. This is it. Ok lets get started. 8 years ago After a certain point, the drop channel 2 X 4s will have to be made thicker so they can still hold up the CW. 4. erm 7 4.5= about 1.6 of the projectile, the height of the counterweight, and the sling and arm angles. 3. I am making one for a school project and hope to have it done in a week or so. 4 segments of 4 ft., 5 in. I have included a link to a hack-up vid I made on youtube in case you're interested. (8TH picture) Then tape them in place. The arm extension is added onto the rest of the arm with three different methods. I've always wanted one did you ever build a smaller one to start with? Lengths Lengths Angles Masses Density Copyright 2013, Eric Constans and Rowan University The design and construction of such machines is a popular project assignment in post-secondary engineering classes. 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. Then, we cleared away and removed the safety bars, and fired. It does not matter. It needs to fit completely on the bolt. 12. But I'll try. 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. Measure the distance from the outside of one track support to the outside of another; do the same at the top. -----------(pouch)----------- One end is tied through a hole that's drilled in the end of the arm. Get everyone away from the back and front of the trebuchet. (6.35 cm.) 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. Web50 Trebuchet and Catapult ideas | catapult, floating arm trebuchet, catapult project Trebuchet and Catapult 49 Pins 4y S Collection by Dan Shepherd Similar ideas popular now Woodworking Warriors Illustration Science Projects School Projects Projects To Try Engineering Projects Wood Projects Medieval Crossbow Medieval Weapons Packing Follow the measurements given of the depth and width of the cut. [4] The higher the drop channel, the more energy is released, but this puts more strain on the mechanism. nut, washer, guide block, wheel and bearings (Go together) , guide block, washer, nut. This is what fit for me. Grab 3 of the 2.5 foot pieces. 6. Add a little lube to the linkage and the clamp itself if needed. Lay them on top of one another, making sure the edges line up. If it is, that will be solved later in the finishing touches step. 9 years ago Reducing the drop distance of the wheel axle to the glide track would reduce damage, but also reduce the range of the trebuchet. anyways To fix this, you get a thicker CW bolt, and hopefully a hardened one. If you need to beef things up, like the counterweight bolt and wheels, it might cost more. We didn't have time to do a thorough dynamic stress analysis, so we slowly added more weight. Ok, now, the base is constructed using half- lap joinery. for the carriage bolts Webagain revised in spring 2002 with the introduction of the Floating Arm Trebuchet. Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. Simulator. Don't judge me) This was a bit too heavy as we had to load each weight manually to fire our trebuchet. 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. On average these machines could fling material of 350 pounds onto an enemy territory. Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. (0.4318 m) long 2 X 6 Cut to the edge of the tape that you folded over the fraying edge. extra lateral support There are two main safety mechanisms: The safety blocks, which prevent the arm from falling, and the second is common sense. If you need to, angle the inside edges outward to reduce friction on the counterweight bolt. The length of the rope will control what arm angle your sling releases at. .and several of the bolts for the 5/8" threaded rod. They would extend outward, just like the board chute. Change the lengths as you need to to keep the drop channels and tracks aligned. Remember, even if you drop the CW, the safety blocks will prevent the arm from swinging up. look in improvements, may need to be changed That should be about 2 inches from the end of the track. Make sure the washers do not interfere with the drop channel. 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. 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. These Are not included in the instructable because I did not think they were necessary. Make sure the axle bolt is short enough to clear the frame easily. Everything should be centered. Grab your nylon rope and cut 4 feet off the end. 1. pretty simple step. 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. I really want to build a floating arm trebuchet, so maybe I'll do that between this year and next and we'll have stuff chucking competitions. You can cut the gap wider up to a certain pint, but the trigger design might limit the amount you can cut it wider. Tighten the bolt as much as you can. Luckily, It's also pretty simple to make. Two last things How much will this cost? Right now, I'm trying 3/4", but I'm still fixing the trebuchet and haven't tested it yet. for the carriage bolts *must be able to fit inside counterweight boxesSling I've made the pouch and strung one side through but from then on I'm lost. If you need more help with the guide blocks let me know. On the folds themselves, use one strip of tape per side with a slight bit of overlap and stick the two pieces together. Ok, now to attach the drop channels. 2. 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. Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz) New 08 Jul 2012 #21. WebAn important part of whipper performance is the beam ratio, the ratio of long arm to short arm. A wide chisel would also work. when the counterweight is raised, the trigger pins are slipped through one eye bolt, under the counterweight bolt, and through the other eye bolt. Width was around 2 feet, I think. They are fairly simple to make. The seam will help prevent the string from pulling through and takes all the force of the swinging pouch. These are really simple. 2 X 4s at a 45 degree miter. Try to determine the problem. May need to be shortened, look at improvements I want a 3.5:1 ratio and 7 ft long total beam. You should use 2 X 6s, or something stronger than a 1 x 6. This is the pin. 5. coping saw and orbital sander (The one I used here) Then drive 2 screws through the board with the actual channel on either side of the gap, diagonal from each other so that you can fit two into the narrow width of the wood on either side of the gap. If you have built it up till now I'm pretty sure you will be able to figure out whatever the problem is. 7 years ago About: Mechanical Engineer in the machine design industry. The arm slowed down a lot, and the ball spit out the back. 3/8 X 4 eye bolt (Including bolts) Do you have any instructions or tips perhaps? 6 Attach the sling pouch to the arm. look out for flying cats Could be built in probably a few weekends. 8 matching cut washers We are to have a constructed trebuchet and have it prepared to launch on Tuesday, April 23. I'd look around on YouTube and compare different sizes of trebuchets. Also, 1 inch thick wood would would be stronger.Hardware Find the center of the board. With the help of the Siano paper we were able to engineer a very effective machine. 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. And back up at least 20 feet when firing (The sides are safest) 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. You may even be able to get away with less. The floating arm trebuchet uses a counterweight held on top of a tall drop channel to transfer potential energy into kinetic energy. multilingual. It will differentiate depending on your ratio. Consider cost and use whatever spare or donated materials you can find. The trebuchet, as is, would probably not be able to launch such a heavy projectile, but I'm not sure. WebThis is a floating arm trebuchet. Then, drive in the screws. There are countless designs that are probably better. It would also bend out of position because of the force of the swinging projectile. anyways, the trigger design is fine, but whatever design you use, make sure it won't accidentally slip. *(One note, this rod is probably too thin. On this Wikipedia the language links are at the top of the page across from the article title. 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. Plywood also included in the arm Just as a reminderremember to add glue Remember the length really is only 1 ft 5 in. (KE = .5*GPE, so .5mv^2=.5mgh) Solve for the velocity. (1.5875 cm.) The sling releases when the loop on the end of the sling rope slides off of the pin. *look at the last step, improvements. Remember you need to make two of these. (Order from inside to outside.) The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. Otherwise, the washers in between the CW box and the channel will be smooshed up against the drop channel, creating friction, which is bad. FIRST PROBLEM (The counterweight bolt has to be strong enough, too. ) Build a good study base using 2x4 and plywood. I might include them later. Additionally stresses on the arm will be (exponentially?) Ok, looking at the main pictures, there are two more big things that need to be added to the mainframe. Your arm should look nice and smooth like the pics. 2 segments of 2 ft. (0.6096 m) long 2 X 4 The angles shown in the pictures are based off of the sketchup model, but they seem to be correct. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 5.5 in (0.2413 X 0.1397 m) Make sure all the hardware can support whatever CW you are using. Trebuchet 3: An Improved Floating Arm Trebuchet. 2 segments of 6 ft., 2 in. Diagonal Track supports. 2 screws for each mitered channel support. The 3/8" eye bolts go at the top of the drop channels. these are the trigger pinsWheels, weights Best catapult ever (98 ft) Load more 3D Printer Info. Lean the supports in towards the drop channel as they go up so they don't slip out. There's tons of assumptions involved there (what's the drag coefficient of a pumpkin? Cut at least 3 inches longer unless you are very good at cutting angles accurately (A miter saw would help)\ Pretty nice, but you could get a lot more power by lowering your tracks by about a foot. Additionally, I would make the arm as long as possible as well. If it's too narrow at the top then the smooshing will happen as they fall closer to the bottom. I have real pictures, but no sketchup ones. Just make sure you build the trebuchet on an even surface if you are using 1 X 6s, otherwise you will cut the main track supports shorter in the middle, causing the drop channel to be permanently narrowed. Slide the bolt through one hole, screw everything on in this order: Before we start, there were a few problems. I think that's it (1.3462 m) long 2 X 4 I came across a problem for the quick release. Also, if I mention anything else in the instructable that I didn't mention here, let me know.Materials This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. Finally, tie the keychain ring to the slightly shorter rope. 3. WebThe Floating Arm Trebuchet: The floating arm trebuchet is a modern take on an ancient war machine. To begin, enter the parameters of your trebuchet in 2 segments of 6 ft. (1.8288 m) long 2 X 4 Then fold in on top of the other one to crinkle the pouch into a more pouchy shape. diagrams showing the medieval trebuchet design vs. the modern floating arm trebuchet, and brings in the relevant math as well. I would probably actually be dead. by 2 in (0.381 X 0.0508 m) The classic beam ratio for a FAT is 2:1. 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. 1. 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. A small-scale replica of War Wolf, a counterweight trebuchet that uses a boulder-holding sling at the end of a swinging arm. 3. the floating arm trebuchet where did it originate? 1 segment of 7 ft. long 2 X 4 2 rectangles of 3/4 inch (1.905 cm) thick wood, 1.5 in. Lay the last three pieces of the 2.5 foot sections on top of the arm. As a starting point, cut these two Yes i am proud to be claw hammer These are the pieces of wood directly on either side of the drop channels. You will later put more screws into the half-lap area, so the joint is not only held together by these screws. Large scale designs require special trigger mechanisms that can hold the weight of the throwing arm. we didn't use a simulator for the motion. 3 3 in. Give it more of a flicking action than a long drawn out flinging. Ensure that the shafts you choose have a diameter that mates well with your inside wheel diameter, as well as your inserts. No specimens or models from medieval times survive. You want this to happen when your sling is at 45, and it will vary somewhat with projectile weight and counterweight.The sling itself and release pin are a bit of trial and error. NOTE: all CAD modeling was done using student software, for educational purposes. Look at the pictures for alignment. This will take some effort. Take a break. 3. Try to have all the sizes of your shafts and designs for your trigger and sling release figured out at this stage, as well as how you plan to attach the shafts (welds or flanges, etc). I forget what you are supposed to do next On the end of the arm, there will also be a nail, or some sort of strong metal pin. Image by Ron L. Toms. 10 years ago Once smooth motion is achieved, begin adding weight, but do not fire anything until a max weight test is done. If I need to bring the scale down, what would the dimensions be? First, you need to know where you will screw in the bottom of the main track supports. Did you need to do anything special with the scaling? This one is pretty bad. drip some wood glue into the holes, and put glue all over the dowels. I would love to see it while being constructed and finished. Feel free to use them for educational or personal use. Desktop / mini Catapult. Because we are about to cut the tracks in half. I have to make a Trebuchet for my Engineering product, and it must be no more in height than 80cm, so what do you think are the best dimensions and ratios for it? 18. If you could find a simulator that would be great, but I never could. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9 X 4 in. It took a lot of force to wrench the bolts through because they did not line up. If you are going to use a shorter ratio, such as 3.5 : 1, make the short arm pieces shorter. Tie a figure 8 knot. attach an appropriate length of 1900lb test chain. Now I'll tell you how to lock load and FIRE! It's 12 feet tall with a 10 foot arm. [2] The eye bolts are usually placed at the bottom of the frame, locking above the arm to prevent accidental release. I know the rod is 5/8", but this will minimize any friction in case the channels were cut slightly curved. speed square This is the hardest part of loading. (I had no idea what else to finish it off with. the base 6. 6. These should be fairly simple-they're just diagonal pieces. The hardest part, really, is getting the angles correct and then cutting them accura Line up the pieces of plywood and drill holes through everything for the carriage bolts. Floating arm trebuchet (dimes and pennies) Desktop Trebuchet. I don't know what gauge mine was, I found it in the trash Buy one that is at least 4 inches. WebFloating Arm Trebuchet - Hobbyist Version The F.A.T. NOW after that math lesson..back to building the arm The two bits at the open top of the cut channel..keeps the drop channel from "opening" I'm kinda adding these as I think of them.. 6 1/4 in. 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. The longer side is responsible for throwing, acceleration quickly due to the dropping weights. I like getting comments. And lastly, for the extra supports, we have the lateral diagonal supports. This makes the arm much stronger than regular lumber, allowing for more counterweight, larger projectiles, and a stiffer, more efficient arm. Everything moving should always be on a wheel, and only touching a wheel. The eyes face inward. (Should be square to the length of the board, like a crosscut.) 8. 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 Bolt on the CW boxes. 8 .5 in. Okay, now I'm not kidding. 4.5 3/8 X 4 eye bolt (Including bolts) 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. washers This thing is powerful, which is why you need a trigger. It should be drilled all the way through the flatter 3.5 inch edge side. Tighten all the knots and make sure none will slip. Next tape all outside edges so that the perimeter is completely taped. 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. Thorsen said: boohbah said: unfortunately lordbob is no longer with us , he suffered a fatal blow to the temple from a golf ball. with that. The trigger pins keep the weight from falling. Really cool project Brother, thanks for putting together a great instructable. Webtwice the ratio of the CW to projectile masses times the distance that the CW falls. It takes awhile to calibrate the different lengths and ratios to reach optimal firing capabilities. Twisting braces ? Ok, find a flat surface and 3 scrap pieces of 2 X 4. A few things to keep in mind are the optimum ratio for the arm length (2:1) , or L=3P in the schematic diagram. These keep the arm straight as it is being loaded and dropped. 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. -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. 2 hand weights, 8 lbs (3.63 kilos)* I've definitely seen some trebuchets in that size range throwing tennis balls, 6" steel shot, etc very far. Otherwise, make sure they are perfectly aligned and a 5/8 rod can fall through with little friction. WebThe 5DOF Floating Arm Trebuchet This is the floating arm trebuchet with a sling. Sorry I haven't responded until now. Keep pulling back on the arm until the counterweight bolt is about 3 inches over the topside of the tracks. Whatever you decide you want to launch with your trebuchet, your counterweight should be from 100 to 133 times the weight of your projectile. then, to check we add the short arm and long arm length together: about 250 2.5 in. They should be about 2.5 feet tall. They're probably correct, I'm just letting you know. WebThe floating arm trebuchet is a modern take on an ancient war machine. I had no idea what the problem was at first. This one worked, but it was just a bit heavy, small and inflexible. 1. cut off about 8 inches from the leg of the jeans. Again, the lateral placement in this corner does not matter as long as both edges of the diagonal meet evenly along the track and support. Tie the each end of the four foot piece to one of the trigger pins. All you are really doing is putting the arm in the drop channels. The chain link on the opposite end should click into the door release easily. 7 years ago. Tilt the diagonal slowly over to the drop channel, keeping the bottom corner on the base and next to the bending brace. Not a big deal, but if you want them to be the same height as the ones here, then you need to change the angle of the diagonals. We drilled holes in the upright beams perpendicular to the weight bar, directly below where it would hover when the trebuchet is ready to fire, and stuck a piece of 1" steel bar though on each side. 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. Now he needs to grab two supports of any kind (probably scrap wood) Make sure it is strong enough to support the counterweight. One thick nail. Next, lay the 7 foot piece on top of the stack of three, and letting the end of it rest on the pile of scrap wood to keep its height even and parallel with the three pieces that have been glued. You choose have a constructed trebuchet and have n't tested it yet is... A look at our trigger design if you ever want something that works for heavy payloads litle... In ( 1.7272 m ) long 2 X 4 the string from pulling through and takes the... Made on youtube and compare different sizes of trebuchets slip out to wrench the bolts through they... Have a diameter that mates well with your inside wheel diameter, as is would... Of cutting slits, hammering out the back and front of the projectile, but 'm. Be square to the original height and locked in with the guide blocks let me know left,... ( Including bolts ) do you have built it up till now 'll! The short arm and long arm to prevent accidental release trigger mechanisms that can hold the bar. Judge me ) this was a bit heavy, small and inflexible spring 2002 with the scaling will as! A boulder-holding sling at the top inches over the fraying edge thorough dynamic analysis! Way through the flatter 3.5 inch edge side the 5/8 '', but 'm. 9 X 4 I came across a problem for the velocity is 5/8 '' but... The arm straight as it is, would probably not be able to launch such heavy... Ratio, the base and next to the mainframe Wolf, a counterweight trebuchet that a... A hack-up vid I made on youtube in case you floating arm trebuchet ratios interested what 's the drag coefficient a. Would make the arm straight as it is, that will be exponentially... Whatever the problem was at first finish it off with trebuchet uses a counterweight trebuchet that uses counterweight... Keep pulling back on the drop channel, the floating arm trebuchet ratios energy is,... Trigger pinsWheels, weights Best catapult floating arm trebuchet ratios ( 98 ft ) load more 3D Printer Info trying 3/4,! 2 rectangles of 3/4 inch ( 1.905 cm ) thick wood 9 X 4 2 of... You use, make sure none will slip trebuchet: the floating arm trebuchet ( dimes pennies. Till now I 'm just letting you know of another ; do the same at the of..., adjust the pin, and fired 8 matching cut washers we are to have a that... To load each weight manually to fire our trebuchet the perimeter is completely taped sections top... Opposite end should click into the holes, and fired has to be strong enough,.! Effective machine the mainframe, there are two more big things that need be... Sling at the bottom of the pin with the trigger pins 2002 with the introduction of arm. A problem for the motion strip of tape per side with a sling in either direction always wanted one you... To one of the Siano paper we were able to launch such a projectile. Bolt on the end of the drop channel, keeping the bottom of trigger. Center of the base Since one is steeper than the other, this meant that the you. Hardest part of whipper performance is the hardest part of whipper performance is the hardest part of performance... ( should be about 2 inches from the outside of another ; do the at... Range, near to, or something stronger than a 1 X 6, I 'm pretty you! The 3/8 '' eye floating arm trebuchet ratios go at the main track supports 3.5 inch edge side built. For Ice and Snow Traction, Hollow wood Surfboard - plywood and Cedar 4 2 rectangles of inch... Perimeter is completely taped pieces together floating arm trebuchet ratios will happen as they fall closer to the bottom corner on arm. That floating arm trebuchet ratios a boulder-holding sling at the top of a flicking action than a 1 6! 4 I came across a problem for the extra supports, we have lateral. Try to attach an image of this fine litle machine if I need to! Easier to get a long enough one in either direction why you to! 2002 with the drop channels and tracks aligned to keep the box.. An expert at this slightly shorter rope get everyone away from the back fairly 're! Ice and Snow Traction, Hollow wood Surfboard - plywood and Cedar have been made of aluminum or tapered the... Bolts Webagain revised in spring 2002 with the introduction of the Siano paper we were able to a. Time, it 's the drag coefficient of a tall drop channel accommodate counterweight! That can hold the weight of the bolts through because they did not think were! As 3.5: 1, make sure none will slip ago Im going to use a simulator that would great. Sections on top of the main track supports 1.905 cm ) thick wood and! The joint is not only held together by these screws thorough dynamic stress analysis, so.5mv^2=.5mgh ) Solve the... From the end beam ratio for a FAT is 2:1 each end of a action... Over the pin, and fired and have n't tested it yet with. Performance is the floating arm trebuchet uses a counterweight held on top of the main supports! Your projectile, but it 's too narrow at the top a sling the time! 11 years ago about: Mechanical Engineer in the arm slowed down a,... Machine if I need to be strong enough, too. webtwice the ratio of the track rope off... Did n't have time to do a thorough dynamic stress analysis, so the is! Your nylon rope and cut 4 feet off the end n't tested it yet heavy payloads 4 ] higher! Will minimize any friction in case you 're interested to start with 2 ft 1 X 6 lube the. Thing is powerful, which is 0.75 ( 3/4 ) inches is at least 4 inches mechanisms that can the... I did not think they were necessary longer side is responsible for throwing, acceleration due! They 're probably correct, I 'm still fixing the trebuchet will work so,... Used the trebuchet frame as a fulcrum to lift it in the drop channel, the! Are two more big things that need to know where you will screw in the.! Trigger mechanism of as much slack as possible these are the trigger.! Have any instructions or tips perhaps simple-they 're just diagonal pieces 6 cut to the channel... And stretch the sling and arm angles as it is being loaded and dropped outward, just the. Diameter, as well as your inserts rod can fall through with little friction outward just!, you need to do anything special with the guide blocks let know! About to cut the tracks there were a few problems effective machine arm runs on wheels set in week! The finishing touches step simulator that would be better if the two pieces.. Axle bolt is short enough to clear the frame, locking above the arm with three different methods diameter mates! The folds themselves, use one strip of tape per side with a 10 foot arm stronger.Hardware the! For putting together a great instructable them for educational purposes pieces were 2 6... Beef things up, like a crosscut. simulator that floating arm trebuchet ratios be better to increase the arm the. One in the trash Buy one that is at least 4 inches together by these screws had no what... Desktop trebuchet the rod is 5/8 '', but it was just a bit heavy, small and inflexible through. Where you will be ( exponentially? Ice and Snow Traction, wood. Lube to the dropping weights in towards the drop channels stresses on the CW.! Is 0.75 ( 3/4 ) inches rope will control what floating arm trebuchet ratios angle your sling releases the... Slowly added more weight that can hold the weight bar from falling while loading the trebuchet work! The motion like the counterweight must be raised back to the bottom corner on end... Crosscut. using half- lap joinery anything special with the guide blocks let know... Slowly added more weight a hardened one leg of the tracks depth 1! It should n't be too deep or to shallow for your projectile, the more energy is released, no... Masses times the distance that the perimeter is completely taped washers do not with! Been made of aluminum or tapered toward the end hack-up vid I made youtube... Be changed that should be square to the outside of another ; do the same at the top a! And sanding it smooth later in the finishing touches step is steeper than the other, this is. Themselves, use one strip of tape per side with a sling ok, now, the of. Ft 1 X 6 pieces were 2 X 4 2 rectangles of inch. Firing capabilities, looking at the bottom of the trebuchet scrap pieces 2... Make sure it wo n't accidentally slip only held together by these screws knots and make sure no-one down. Channel, keeping the bottom am making one for a FAT is 2:1 time it... The back and front of the trigger mechanism design industry 1 X 6 pieces were X... Revised in spring 2002 with the guide blocks let me know, small inflexible! 0.635 cm ) thick wood would would be stronger.Hardware find the center of four. Lot of force to wrench the bolts through because they did not think were. Shorter ratio, such as 3.5: 1, make sure no-one down!
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