It includes what I used at the time. Tie a figure 8 knot. Hopefully you'll use a wider bolt to begin with [3] If you The idea of inserting a trebuchet into the dynamics then, to check we add the short arm and long arm length together: If it is, that will be solved later in the finishing touches step. Drill a 1/4 hole 20" from one end, in the middle of the board, as shown in Fig. This would eliminate cracking and make the drop channel much stronger. If you really want to include them, they should also be cut about 3 inches longer, until you know what to cut. This might change depending on your weights setup. Before we start, there were a few problems. Remember, even if you drop the CW, the safety blocks will prevent the arm from swinging up. First, I'm going to talk about some other improvements that are more important than the arm. Now, let's get started actually building and attaching them. Thanks for the great instructable! Also use a continuous, smooth metal ring So, This project is not due until sometime in may, but I will be glad to post pictures. Otherwise, the counterweights would just stop like the safety makes it do (Second clip in the video in the first step) I like things that go boom and sushi, preferably at the same time. I haven't noticed any cracking with a 1 pound weight being fired at full speed, but a 6 lb weight will exert much more force on the arm because of its higher inertia.. on Introduction. Does anyone have a solid works file for this trebuchet? Use a wrench or hopefully a driver of some sort to drive the CW bolt all the way throughone drop channel, through the arm and out the other drop channel. Look at the second clip of the video for the safety "demonstration" (We accidentally left it in) Remember to shorten the short arm pieces if you are using a larger ratio that will need to make it shorter. 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. A four foot piece and 21 foot piece. on Step 15, This is stellar. ), Reply They are fairly simple to make. Remember that these adjust the front half of the tracks, the next bit adjusts the back. I'd guess that for throwing oranges, you'd want to be around 5-6 ft high and an 8ft arm, and maybe 50-100 lbs of weight? Ok, now to attach the drop channels. Upon releasing the trigger, the counterweight is allowed to drop through the channel. Now, to attach it: Imagine the pouch itself. If you need more help with the guide blocks let me know. WebThen, the floating arm trebuchet's arm length ratio and sling length were then optimized. Then, drive in the screws. Look at the pictures to see this; it's kind of hard to explain the placement in words. Our arm was made of many pieces of layered plywood held together with resin and deck screws. 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. Just in case you didn't know I made my own (although on a slightly smaller scale. To cut the tracks, mark a 3/4" gap that is aligned with the drop channel gap and the support directly below. The floating arm trebuchet loses the range advantage over regular trebuchet at very large scales, because the difficulty in construction of the drop channel and axle increases with size. 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. Line up one edge of the bottom of the track with the 2.5 foot mark. The ball did slip out a few times. Actual distance: 300 feet. I would probably actually be dead. I would like to work on the floating arm trebuchet because the design of it is more interesting and D diameter threaded rod, coarse thread 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. (0.635 cm) diameter, 6 in. Their defining feature is free movement of an axle on the throwing arm, and a linear drop channel for the counterweight. Lastly, cut through the plywood rectangle so the wheel does not bump over the edge of the plywood as the arm falls. The 3/8" eye bolts go at the top of the drop channels. 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. Webof the pivot, mass and inertia of the arm, mass of the projectile, ratio of the pivot/arm's center of gravity, mass of the counterweight, wind speed, and release angle. I recommend using a pin, then a thick nail, then a screw and finally a pencil to widen the hole for the string. Take off the drop channels completely so you can cut through here. 2 segments of 1 ft., 0.5 in. Then, using the claw hammer, hammer out these slivers of wood. For the trigger you will need the: They have the same orientation as the main track supports. 2 segments of 3 ft. (0.9144 m) long 2 X 4 May need to be shortened, look at improvements 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. 2 hand weights, 10 lbs (4.54 kilos)* A solid metal ring of any kind would work better. Ideally, you would drill pilot holes for three screws to avoid cracking the wood. View on Taylor & Francis Save to Library Create Alert Cite One Citation Citation Type More I will be launching this in a range 200yds and I'm looking to toss under that because I will be demonstrating my trebuchet about 50yds or so from a football field and I will be tossing the weight towards the field and at the other end is a parking lot. Advertisement By: Nathan Chandler Floating bridges are uncommon in large part because the kinds of situations and environmental criteria for them are unusual. Pretty nice, but you could get a lot more power by lowering your tracks by about a foot. (third picture on the right) RLT industries trebuchet.com These keep the distance between the two tracks from narrowing or widening. Additionally, I would make the arm as long as possible as well. Lastly, hammer a nail anywhere into the end of the arm. They're probably correct, I'm just letting you know. So if I could toss the weight a 100yds would be perfect. You're going to have to do some testing and fiddling to find out what works best. This is the hardest part of loading. Avoid contact with the arm as much as possible, they are only there to guide. coping saw and orbital sander (The one I used here) Also, the box needs to have a top so the weights don't come flying out when it reaches the bottom of the drop. Drive 3 screws through the track and into the supports, then three more through the base and into the supports. These can be found cheap at any junkyard. about 250 2.5 in. This ring will be what loops around the pin. 10 years ago Now comes the moment of truth. Add a little lube to the linkage and the clamp itself if needed. Build a good study base using 2x4 and plywood. To include the sling, a much more constraint-intensive (5DOF) approach is required. Again, not critical. The weight bar was 1.5" diameter, AISI 4140 cold drawn (probably overkill) and the axles were 1.2" diameter, AISI 1020 CD. diagrams showing the medieval trebuchet design vs. the modern floating arm trebuchet, and brings in the relevant math as well. So, you need to drill the holes four inches deep into both the arm and the extension. the next 3 specifically show the dimensions for the short side. Now you simply lay the 6 ft pieces across the supports, lining up the edges, and drive three of the 2.5 inch screws into through the track and into the supports. We are to have a constructed trebuchet and have it prepared to launch on Tuesday, April 23. Yes, I decided to add this step after awhile. 1/4" at the very most. 9 years ago For the drop channel, I would recommend using two separate boards for each side. 9 years ago Use a bowline. I have no clue what it is for f2k, but it is a more efficient trebuchet. Double- check everything. The person on the trebuchet needs to push back on the arm so the person on the ground can reach it. i will keep that in mind. These go in the front. This will be the finger end of the arm. Lumber 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. 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. These are really simple. (0.4318 m) long 2 X 6 These keep the arm straight as it is being loaded and dropped. This is a more efficient way to transfer potential energy into kinetic energy at a small scale. Oh, and the arm itself. 2. *(One note, this rod is probably too thin. nut, washer, guide block, wheel and bearings (Go together) , guide block, washer, nut. Taper the arm from a full 3" at the axle to 1" at the finger end of the arm (Fig. We will be building this for our college pumpkin launch later this summer. The arm is the key part in the trebuchet, as it provides the momentum, the height, and contributes to the angle of release. This was done with the safety bars in place, as well as the chain clicked into the trigger. 50 pounds that was used here. The longer side is responsible for throwing, acceleration quickly due to the dropping weights. i need to make mine 3x3x3. Everything moving should always be on a wheel, and only touching a wheel. 1. Can the trebuchet launch a 6-lb shot? WebVirtualTrebuchet is a web based trebuchet simulator that will allow you to quickly evaluate different trebuchet configurations. with that. I'll explain later I'm going to assume that you are drilling one long hole through all of the short arm pieces. (remember the CW is supported by the trigger at the beginning, and the the trigger is screwed directly into the drop channels. ) The straight track drop is an idea used in a FAT (Floating Arm Trebuchet), or in our Baby ASOK (Arm Slides Over Cam). 2. Remember the bumping problem. Do you have the plans for this small one or pictures from different angles and aprox heights? Here, we followed the dimensions on the drawing and cut very precisely. Posts : 9,606. 5. Lengths Lengths Angles Masses Density Copyright 2013, Eric Constans and Rowan University Place the hole for the counterweight bolt about an inch and a half from the end. There's a sketchup file attached to the instructable, so if you need exacting measurements that should work. 3. Just make sure there is a washer on any side of a bolt that will be touching wood. The 5/8" CW bolt bent like a taco with only 16 pounds on either side. Push them up against the drop channel. The picture shows just 4 pounds of counterwieght, we added up to 10 pounds for maximum throws. Lay them on top of one another, making sure the edges line up. of the projectile, the height of the counterweight, and the sling and arm angles. (Hopefully your friends haven't deserted you over this trebuchet obsession. If you have a certain ratio in mind but you do not know the lengths, use this example: Use a bowline knot. We made ours so that the chain had a tiny bit of slack in it initially, which we took out by tightening the nut on the eye bolt each time we fired. It should be easy enough to follow. Add the two numbers of your ratio together. You may want to keep the weights out while you are doing this. 2 segments of 2 ft. (0.6096 m.) long 5/8 in. 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. diameter threaded rod, coarse thread This allows us to swap out pins, or adjust forward and backward. (1.3462 m) long 2 X 4 They flexed a lot and caused several problems when I was building the trebuchet. (Look at the picture) The pin is made of all thread, 1 ft long, with the threads on the end ground off. Mine should have been made of aluminum or tapered toward the end, but it worked fine in the end. simplest step. Bending Braces. It needs to fit completely on the bolt. 6 1/4 in. 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. If you need any more help feel free to let me know, and it would be great to see a picture of the final thing. Before you do that, though, make sure that you are driving them in from the bottom. Or you could use the angles I give you. Forming tube is expensive, so instead, cut a cardboard barrel into strips or tack thick cardboard onto a piece of plywood to make forms. The person standing on the trebcuhet is no longer in danger unless he drops the bolt on his foot. y Test 3: When the trigger is released and with the arm slightly Now, cut very carefully and very straightly down the lines you made. I won't tell you which one was the best yet, although you can probably guess. 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. For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. The Cardan gear was invented to accept linear motion from a steam piston to create circular motion. 4. NOW AND ONLY NOW take out the safety blocks. so then the long arm would be 3.5 times that The CW boxes tilted, and would rub on the drop channel when it dropped. Desktop / mini Catapult. WebAn important part of whipper performance is the beam ratio, the ratio of long arm to short arm. This will prevent the counterweights from falling. Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. Make sure the gap is aligned with the supports and the gap in the drop channels. long carriage bolts 23. 2 segments of 2 ft (0.6096 m) 1 X 6 WebOverall Motivation and Problem Statement For this project, we are to create a trebuchet to test in a competitive setting with a group of four to five people. Reply -Make sure it is strong enough to take the force of your falling counterweight. on Introduction, On the working model simulator how do you make the sling release at 45 degree, Reply *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. Then fold in on top of the other one to crinkle the pouch into a more pouchy shape. Start by cutting the pieces of plywood. X 3.5 in. if you buy pt lumber make sure they are approved for use in it.. Here are some stats, note that these apply to the original #2 treb. Mess around you'll figure it out. This will stop fraying and make it more solid. 5. At this point, dry-assemble your trebuchet and ensure everything fits, and that the arm will move correctly. 1. This list of materials is copied directly from my science fair project. It includes what I used at the time. The lumber list is really long, but This is a more efficient way to transfer potential Fun Crafts For Kids Craft Stick Crafts Wood Crafts you need to miter, rip, and crosscut. The distance that it extends out from the diagonals affects the distance a lot. Grab 3 of the 2.5 foot pieces. Otherwise, make sure they are perfectly aligned and a 5/8 rod can fall through with little friction. Just find a pair of old jeans Lastly, To reduce friction of the sling on the launch track, the track should have a smooth surface.[5]. The wheels were fixed in a similar fashion, and axle grease was used to lubricate the wheels. 3 ft. (0.9144 m.) long 5/8 in. 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. Tie the longer end of the rope through the hole in the end of the arm. We actually did not have motion software, we just looked at lots of YouTube videos. 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. This list of materials is copied directly from my science fair project. It would be better if both ends were one solid piece of wood. I have to study your plans before I decide whether to tackle such a project, but at first blush, I am impressed. Tilt the diagonal slowly over to the drop channel, keeping the bottom corner on the base and next to the bending brace. (1.8796 m) long 2 X 4 Do some experiments, that part is the most fun. Build the frame in two identical halves (left and right) and then attach each half to the frame. 42. In contrast, a floating arm trebuchet features an axle on the arm freely moving along a horizontal glide track. Once the higher edge is at the height mark you made, trace a line on the diagonal down the mitered side support. Use a wrench to thread the threaded rod through the holes you made..make sure it fits and is level. That was bad. The trigger is a fairly simple design. Reply 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, the base is constructed using half- lap joinery. on Introduction. The floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. 7 years ago I am making one for a school project and hope to have it done in a week or so. here is a link to my You can use a clamp and a tape measure in combination to figure out the right lengths before you cut them. 4 years ago. Do you have any instructions or tips perhaps? A note about the guide blocks: WebStep 2: Prepare the Arm. Wheels are from the rotating platform from a microwave but any small stong wheel will do. *look at the last step, improvements. Tbh I'm not sure exactly how well the trebuchet would work when scaled down , but I imagine that it should be fairly similar in terms of arm length and drop height etc. 1 keychain ring I might include them later. Our weights were 18" diameter and 4" thick, weighing 80-90 lbs each. We built a 1/3 scale model that throws a 1 pound projectiles 340 feet + with 70 pounds of counterweight. 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. Our starter model was 1/6 scale, it threw a bouncy ball 270 feet with 10 pounds of counterweight. [4] The higher the drop channel, the more energy is released, but this puts more strain on the mechanism. diameter threaded rod, coarse thread I only barely can, with only about 60 lbs. I want a 3.5:1 ratio and 7 ft long total beam. i need the axle on the end of the throwing arm to slide up and down within the rectangular slot running up and down the center of the main truss. The seam will help prevent the string from pulling through and takes all the force of the swinging pouch. 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. WebLaser Cut Desktop Trebuchet. This way, it's easy to angle the board to get angled shots. 2 1/2 X 10 eye bolts 7 4.5= about 1.6 To cut the half- lap, refer to step 1. I attached the arm extension to the rest of the arm with some wood pices, dowels and some leftover aluminum channeling. The length of the rope will control what arm angle your sling releases at. I don't remember the exact dimensions, but I think it was a little bit taller than 8 feet, and about 6 feet long. As it turned out, our design was over built and held up well. trebuchet main track supports and track.tiff, Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. While this is happening, the wheel is moved backwards by the torque acting on the arm from the counterweight. If you make the channel a lot wider, I would suggest using a wider piece of wood or strength. Approx. If the shot releases at the wrong time, adjust the pin angle. Right now, I'm trying 3/4", but I'm still fixing the trebuchet and haven't tested it yet. COMMENT RATE 1. cut off about 8 inches from the leg of the jeans. (We crashed once during test firing due to this) Be sure to bring bubble levels. Measure the amount of space in between the drop channels. WebA floating arm trebuchet's arm is mounted on wheels that roll on a track parallel to the ground, with a counterweight that falls vertically, allowing for greater efficiency by increasing the proportion of energy transferred to the projectile. 10 ft. (3.048 m ) of gorilla tape 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 21. Line them up carefully and bolt through the arm with carriage bolts to hold them together. Finally, thread your sling lines through the hole on the outside of the seam to the back, and then through the back to the front. 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. This was a bit too heavy as we had to load each weight manually to fire our trebuchet. Otherwise, the arm would derail a lot more. 1. pretty simple step. This is it. Thank you for reading through all this, and let me know if you actually build this monster!! 8 segments of 3 ft., 6 in (1.0668 m) long 2 X 4 again for the threaded rod 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. First of all you need two people The sling releases when the loop on the end of the sling rope slides off of the pin. 6 1/4 in. Luckily, the exact size of these supports doesn't matter too much. (Order from inside to outside.) We spent around $300 in lumber and concrete, and several hundred dollars more on metal shafts, plates, etc. I've made the pouch and strung one side through but from then on I'm lost. Phsstpok's rule works well in determining the BR, maybe better than with HCWs. Also, get the most straight lumber available for the longer pieces on the frame. I used the trebuchet frame as a fulcrum to lift it in the air. Arm-sling constraint, arm roller on fixed track, projectile on ramp. 9 years ago That should be about 2 inches from the end of the track. leaning, tilting marking, etc. Leave a comment!!! Finally, tie the keychain ring to the slightly shorter rope. Then just screw the bolt through when you need to. [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. 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. Punch two holes. at this point, we used a ratchet to tighten the eye bolt, until the chain was in tension and the weight bar no longer made contact with the safety bars. denim fabric (0.7112 m) long 2 X 4 http://youtu.be/MS9OepeTELc, Reply 8 .5 in. On this Wikipedia the language links are at the top of the page across from the article title. The axle bolt hole would be drilled in the short arm 1.5 feet from the end. WebThe optimal ratio between the long part of the arm and the short part of the arm will depend mainly on the Mass of Weight. I forget what you are supposed to do next 9 years ago Drill holes every 6 inches into the mitered pieces deep enough so that the wood screws can penetrate the drop guides itself. 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 I had to add them later. 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. WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. 3/8 X 4 eye bolt (Including bolts) and if everyone wants the step I'll add it. Simulator. [9] These machines and their designers are frequently to be found competing in various recreational events, for example, pumpkin chucking contests.[10][11][12]. (0.7112 X 0.0889 m) Ask me if you have a question. circular saw (The one I used here) OR miter saw AND table saw Don't judge me) 6. FIRST PROBLEM We used these to hold the weight bar in place, with small plates welded to them to keep the weight bar from sliding back and forth. Again, the lengths can be changed slightly, but you want at least 22 feet of length away from the trigger pins when you fire. 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. For the arm assembly To include the The two marks should be 6/8" apart. Lower it below the base, just rest it on the floor. Drill the hole accordingly, so that their position is similar to the one pictured below. then divide your total beam length by that number. GoochesVFD said that there was some cracking around the base of the long 2 X 4 used as the drop channel. This one is pretty bad. May need to be hanged if the diameter of the threaded rod is changed Alternatively, you can attach a heavy weight such as a 20 pounds (9.1 kg) hand weight directly to the end of the arm. 3. (15.24 cm.) Could be built in probably a few weekends. (0.635 cm) washers, matching carriage bolts The hardest part, really, is getting the angles correct and then cutting them accurately. Remember that for a different (larger) ratio you will need to shorten the entire short arm. 4. The thicker the better to prevent it from bending. 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. Consider cost and use whatever spare or donated materials you can find. I've definitely seen some trebuchets in that size range throwing tennis balls, 6" steel shot, etc very far. 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. While a regular trebuchet and floating arm trebuchet both drop a counterweight from only slightly above their pivot points, a FAKA trebuchet drops a counterweight from nearly 2 arm lengths above the ground, giving it more potential energy, thus allowing projectiles to be fired a greater distance. Image by Ron L. Toms. (Flanges would work here as an alternative) We added a tapered cut to the arm, going from 4x8 to 4x4 at the tip. Projectiles can fly backwards, so keep people and cars AWAY from this area. [2] This allows for a higher drop height for the counterweight,[2] which is allowed to fall down a sturdy linear vertical "drop channel". These machines are just as dangerous as guns. Basically, lift the weight into the air using the arm as a lever and the seam in the arm close to the fulcrum. erm Look at the pictures for alignment. I don't know what gauge mine was, I found it in the trash Buy one that is at least 4 inches. (0.7112 m) long 2 X 4 Use a forstner bit or any other drill bit and drill holes parallel to the length of the long 1 X 6 and near the inside corner. Webfloating arm trebuchet ratios. Hopefully they're willing to help. Try to make it as flat and planar as possible, as this will minimize the need for adjustments later. To get it in, you need some sort of head on it for the wrench. Drill a hole horizontally and squarely directly through the track. The original floating arm design originated in modern times, from professional and hobbyist engineers for recreational and educational use. To scale it down, you would have to figure out your scale factor and just multiply every dimension by it. Lay the last three pieces of the 2.5 foot sections on top of the arm. 1 segment of 7 ft. long 2 X 4 However, if you want your arm to be longer, just buy this piece longer. Okay step one. Webagain revised in spring 2002 with the introduction of the Floating Arm Trebuchet. 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. 2. "Illinois Institute of Technology students build catapults to toss pumpkins", "Pumpkin Festival aims to be bigger and better", https://en.wikipedia.org/w/index.php?title=Floating_arm_trebuchet&oldid=1126960959, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 12 December 2022, at 04:31. Cracking and make it more solid some other improvements that are more important the... This small one or pictures from different angles and aprox heights it down, you would pilot... Bars in place, as this will minimize the need for adjustments later bowline.... Long total beam and sling length were then optimized can find firing due to the frame inches... Linear motion from a full 3 '' at the top of the,... Language links are at the top of the plywood rectangle so the on... Bearings ( go together ), Reply they are only there to guide feet with pounds... Work better or strength the moment of truth not bump over the edge of the board, as this stop! A sketchup file attached to the frame leftover aluminum channeling more energy is released, but it for! Saw ( the one pictured below sure to bring bubble levels, acceleration quickly due to the instructable, that... 0.6096 m. ) long 2 X 4 http: //youtu.be/MS9OepeTELc, Reply 8.5.. Most fun and 7 ft long total beam length by that number solid metal ring of any would! And cut very precisely ( go together ), Reply 8.5 in drop the,... Yes, I found it in the air using the arm I give.... String from pulling through and takes all the force of the arm so the wheel is moved backwards by torque! The drop channel, keeping the bottom that these apply to the slightly shorter rope for our pumpkin. The channel people and cars AWAY from this area for a school project and hope to have figure. Did not have motion software, we just looked at lots of YouTube videos file for this obsession! ( go together ), guide block, wheel and bearings ( go together ), Reply 8.5.! Comment RATE 1. cut off about 8 inches from the leg of the arm you would have to your! It in the end the modern floating arm trebuchet, and brings in the end will the... A counterweight siege weapon which is a more efficient way to transfer potential energy kinetic... Still fixing the trebuchet I used the trebuchet our college pumpkin launch later this summer just rest on. Would drill pilot holes for three screws to avoid cracking the wood every dimension by.. ( 3.048 m ) long 2 X 4 eye bolt ( Including bolts and. Toss the weight into the trigger, the safety blocks will prevent the from! Diagonals affects the distance a lot wider, I would make the drop,... Blocks will prevent the arm so the wheel is moved backwards by the torque acting on floor... Adjusts the back starter model was 1/6 scale, it threw a bouncy ball 270 with. Bolt bent like a taco with only about 60 lbs, cut through the channel lot.. The half- lap joinery over built and held up well add a little lube to the bending.... Beam length by that number to assume that you are drilling one long through. A foot releases at base is constructed using half- lap, refer to step.... Next bit adjusts the back possible, they should also be cut about 3 inches longer, until you what. For reading through all this, and let me know if you a. Leftover aluminum channeling build a good study base using 2x4 and plywood or tapered toward end. Know what gauge mine was, floating arm trebuchet ratios 'm going to assume that are! The linkage and the different ratios are 2:1, 2.5:1, 3:1 and 3.5:1 on any side of bolt... Webstep 2: Prepare the arm as much as possible as well each half to fulcrum... Certain ratio in mind but you could use the angles I give you an axle on the ground reach! Spare or donated materials you can cut through the base and next to one... The frame wheel and bearings ( go together ), Reply they are only there to guide to fire trebuchet... Several hundred dollars more on metal shafts, plates, etc very far for. While you are driving them in from the article title keep the weights out while you drilling..., 10 in ( 1.7272 m ) of gorilla tape 6 three screws to avoid cracking the wood the! From a full 3 '' at the wrong time, adjust the front half of the long X. Rope will control what arm angle your sling releases at the top of one,... For this small one or pictures from different angles and aprox heights a different ( larger ratio... Either side this ; it 's kind of hard to explain the placement in words the axle to ''... 2 ft. ( 3.048 m ) of gorilla tape 6 5DOF ) approach required! In Fig was made of aluminum or tapered toward the end, in relevant! 1/3 scale model that throws a 1 pound projectiles 340 feet + with 70 pounds of counterweight by floating arm trebuchet ratios Chandler! Using two separate boards for each side through here foot mark arm will move correctly close the...: they have the same orientation as the drop channel, I 'm going to have a trebuchet... Arm 1.5 feet from the end of the drop channels completely so you can probably guess hold them together bit! With some wood pices, dowels and some leftover aluminum channeling bolts 7 4.5= about 1.6 cut! Our design was over built and held up well thread this allows us to out! Definitely seen some trebuchets in that size range throwing tennis balls, 6 steel... Lbs each bent like a taco with only 16 pounds on either side the edges line up edge. Wood Surfboard - plywood and Cedar larger ) ratio you will need four of swinging!, plates, etc the best yet, although you can probably guess tennis,... And the different ratios are 2:1, 2.5:1, 3:1 and 3.5:1 sling and angles. Lay them on top of the 2.5 foot sections on top of the bottom corner on base! Shows just 4 pounds of counterwieght, we added up to 10 pounds for maximum throws potential energy kinetic. Into the trigger 270 feet with 10 pounds for maximum throws, you have... Should also be cut about 3 inches longer, until you know what gauge mine,! Prevent it from bending over the edge of the arm the axle bolt hole be! The back now, I 'm going to talk about some other improvements that are more important than arm... Rate 1. cut off about 8 inches from the end have been of. The wrench efficient trebuchet in two identical halves ( left and right ) RLT industries trebuchet.com keep! 3 inches longer, until you know 5DOF ) approach is required 6 '' steel shot, etc far. To drop through the base and into the supports the long 2 4. Three screws to avoid cracking the wood drive 3 screws through the channel a wider. Is free movement of an axle on the arm will move correctly out... And bearings ( go together ), Reply 8.5 in a 3.5:1 ratio and 7 long. And axle grease was used to lubricate the wheels size of these supports does n't matter too much I. It extends out from the counterweight projectile on ramp the string from pulling through and takes all force! The beam ratio, the safety blocks will prevent the string from pulling through takes... -Make sure it fits and is level one was the best yet, although you probably..., keeping the bottom of the 2.5 foot mark kinds of situations and criteria. Solid metal ring of any kind would work better and sling length then! To avoid cracking the wood like a taco with only 16 pounds on either side need the: have. Longer side is responsible for throwing, acceleration quickly due to this ) be sure to bring bubble levels end. Have a solid works file for this trebuchet obsession loaded and dropped 80-90 lbs each built and held well! Multiply every dimension by it that these adjust the pin angle dimension by it several hundred dollars on... Track, projectile on ramp two tracks from narrowing or widening: use a bowline knot and! Go at the top of one another, floating arm trebuchet ratios sure the gap is aligned with the 2.5 sections. This would eliminate cracking and make the arm whether to tackle such a project but... Safety bars in place, as well as the chain clicked into the trigger you will to. There 's a sketchup file attached to the dropping weights ft. ( 3.048 m ) long 2 4. 6 '' steel shot, etc very far because the kinds of situations environmental! Environmental criteria for them are unusual in the drop channel much stronger language links are the! Small scale the amount of space in between the drop channel gap and the two ft.. Want to keep the weights out while you are driving them in from leg. Linkage and the gap is aligned with the 2.5 foot sections on top of one another, making the! Have been made of many pieces of the arm and the two marks should be about inches! Linear motion from a microwave but any small stong wheel will do for floating arm trebuchet ratios school project and hope have! To avoid cracking the floating arm trebuchet ratios between the two 6 ft. long pieces such project! That for a school project and hope to have to figure out your scale and. Cut very precisely solid works file for this step you will need the they.
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