floating arm trebuchet ratiosfloating arm trebuchet ratios

For me, for the side with the longer support, this was about 5 ft, 7 inches from the very bottom of the drop channel. Line up one edge of the bottom of the track with the 2.5 foot mark. (Forward to the direction of motion makes it release later, backwards= release sooner. on Introduction, do you have the exact dimensions of the final product. I want a 3.5:1 ratio and 7 ft long total beam. 8. Luckily, I eventually lined up the holes. Remember you need to make two of these. They must be perfectly straight and lined up. WebA trebuchet is a device used in the Middle Ages to launch very heavy objects at opponents during battle. Make sure that the washer in between the CW box and the drop channel is not caught on the bolts protruding from the eye bolts (Trigger pin holder.. things) Make sure it will be able to fall freely, But do not remove the safety yet. Wheels are from the rotating platform from a microwave but any small stong wheel will do. [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. Summary The floating-arm trebuchet, a modern variation of a medieval weapon, is a popular project for physics and engineering instructors.We develop and analyze a model of this device as an introduction to constrained Lagrangian dynamics. I don't remember the exact dimensions, but I think it was a little bit taller than 8 feet, and about 6 feet long. You want the drop channels to be the SAME DISTANCE APART THE ENTIRE WAY up and down their length. Additionally stresses on the arm will be (exponentially?) Again, use a bowline knot. Projectiles can fly backwards, so keep people and cars AWAY from this area. It needs to fit completely on the bolt. for the sling Axel for the masses is coathanger wire but ensure the axel never absobs the full impact of the falling masses as it will bend. 9 years ago Trebuchet. Drill the hole accordingly, so that their position is similar to the one pictured below. Did you make this project? The key ratio of an arm is anywere between 3:1 and 5:1. 10 years ago the base Awesome! May need to be shortened, look at improvements It wasn't the best design for very straight shots, but for me it worked very well. Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz) New 08 Jul 2012 #21. Did you need to do anything special with the scaling? A shorter length sling will work better for lighter projectiles, while a longer length will be better for heavier projectiles. I'll write more about this in the improvements step. WebThe Floating Arm Trebuchet: The floating arm trebuchet is a modern take on an ancient war machine. 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. then divide your total beam length by that number. Two last things How much will this cost? [2] The projectile can be launched at a high velocity.[6]. Next we have the drop channel supports. So we built a 10 throwing arm trebuchet. Alternatively, you could download the sketchup model, highlight the entire thing, scale it down and get the dimensions directly from there. (6.35 cm.) 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. 23. Lastly, make sure everything is square. Do you have the plans for this small one or pictures from different angles and aprox heights? hacksaw if you don't have a METAL CUTTING BLADE FOR YOUR JIGSAW, The base is finished. Then cut the axle about 3 inches shorter than the width. Use your head before you lose your head 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. *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. 2 rectangles of 3/4" in. Tie a figure 8 knot. When firing, make sure no-one is down range, near to, or directly behind your trebuchet. There's tons of assumptions involved there (what's the drag coefficient of a pumpkin? Plywood also included in the arm less than on a longer, heavier arm, so you have more of an opportunity to make it extremely light, if that makes any sense. The ridges would sometimes catch on the heads and sometimes not. 2. on Introduction. It will prevent frame strikes, jams and other problems later on. Punch two holes. "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. Try to determine the problem. Thats a bit longer than 7 feet because i rounded 7 4.5 up, it was really 1.55555555 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. What I do not Floating Arm Trebuchet Page 3 of 3 First 1 2 3. Webfloating arm trebuchet ratios. on Introduction, On the working model simulator how do you make the sling release at 45 degree, Reply Jump to page: DocBrown. 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. This is essential for an efficient machine. First, pick one end of the trebuchet to be the back. The walking arm trebuchet is a good example, which uses an unconventional design to great effect. Simple Table Top Catapult. Then drive 3 through the base and into the bottom of the drop channel. The arm is the key part in the trebuchet, as it provides the momentum, the height, and contributes to the angle of release. i just copied that Really hope we get the hooks and sling parts to make trebuchets wor 9 years ago This kit is professionally engineered, designed and manufactured in the USA. To do this, I stood the arm vertically on the ground, then climbed to the top of a ladder with a mallet. Look at the second clip of the video for the safety "demonstration" (We accidentally left it in) 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. WebFloating Arm Trebuchet. jk. If the weight is very heavy, the long part of the arm can Once they are pulled, they do not interfere with the motion of the arm. 10. Use a door release mechanism from a car for your trigger. To launch such a heavy projectile will require much more weight than the approx. 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 1 segment of 7 ft. long 2 X 4 However, if you want your arm to be longer, just buy this piece longer. The arm is done. Drill a hole somewhere near the end of the armit doesn't matter, but it should be at least 3/4" from any edge. Otherwise, the counterweights would just stop like the safety makes it do (Second clip in the video in the first step) One thick nail. I would still recommend that you read through the list, and buy the lumber as you need it to avoid wasting wood. It's a little bit tricky to get the angles perfect. Different jeans vary, so this next step might be different for you. The length of the rope will control what arm angle your sling releases at. Hopefully everything has been built straight and solid. The floating arm trebuchet is a counterweight siege weapon which is a modern variation of the medieval trebuchet. (This is actually for the trigger) Our sling (not pictured, there is a shot of it in the video) was made of woven nylon web straps. Thorsen said: boohbah said: unfortunately lordbob is no longer with us , he suffered a fatal blow to the temple from a golf ball. Platform is pine. You need to find the angle to cut the board at so that it will be straight against the edge of the mitered side support. Ok, now, the base is constructed using half- lap joinery. Also, the box needs to have a top so the weights don't come flying out when it reaches the bottom of the drop. Measure the distance from the outside of one track support to the outside of another; do the same at the top. Virtual Trebuchet is a free web based trebuchet simulator. MATERIALS LIST: -Lumber (4x4, 2x4, plywood) -Deck Screws (lots of them) -Carriage bolts, nuts, washers -all thread, 1/2", 1ft sections (for sling pins) -Harmonic Balancers ~7" dia (4X) -Steel Shafts, various diameters -Steel pipe, appropriate mating diameters to shafts -Bolts for bushings -Concrete (450+ lbs) and circular forms (OR just use gym weights) -Steel plates -Steel chain, 1900lb test, 3-4ft -Door latch mechanism from a car -Nylon rope (or other strong rope/cable) -Nylon webbing for sling -Axle grease -Welding equipment -Grinder -Drill press -Carpentry tools -Paint (optional). WebThe 5DOF Floating Arm Trebuchet This is the floating arm trebuchet with a sling. I've made the pouch and strung one side through but from then on I'm lost. (1.8796 m) long 2 X 4 What did you finally use for the rollers? MAKE SURE THE EYE OF THE TRIGGER PIN IS FACING THE FRONT OF THE TREBUCHET otherwise you will have to switch it. Hey I just made that up right now. 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. Just on top of the tracks. Tools 5. Bending Braces. 17. Cut these two twisting braces at around 1 ft 2 inches because the length of these will affect the width between the tops of the two drop channels. Thanks for the great instructable! This is a general description of how to create a floating arm (f2k) trebuchet. May need to be made thicker OK onto step 1 For this you will need your circular saw, sander and the claw hammer if you don't have a router. y Test 3: When the trigger is released and with the arm slightly This is a more efficient way to transfer potential Fun Crafts For Kids Craft Stick Crafts Wood Crafts washers Luckily we caught it and injuries were avoided. Well, for me, it wasn't really a chute. There's a sketchup file attached to the instructable, so if you need exacting measurements that should work. Then bolt on the wheels. To get it in, you need some sort of head on it for the wrench. The arm extension is added onto the rest of the arm with three different methods. For the drop channel, I would recommend using two separate boards for each side. In response to urbanmx, this was our very first trebuchet. Approx 25 ft. (7.62 m)1/2 braided nylon rope for the carriage bolts Drill the holes for the eye bolts. Pretty nice, but you could get a lot more power by lowering your tracks by about a foot. I will be modeling my trebuchet after your and would like to know Can the trebuchet launch a 2-lb dumbell? The knot should be on the inside of the pouch. 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? Line them up carefully and bolt through the arm with carriage bolts to hold them together. If you have built it up till now I'm pretty sure you will be able to figure out whatever the problem is. If it's too narrow at the top then the smooshing will happen as they fall closer to the bottom. The classic beam ratio for a FAT is 2:1. 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. First, obviously, just lay the arm in between the drop channels (Just the middle of the treb) A four foot piece and 21 foot piece. For them to fit, I had to cut different lengths off of the diagonal supports. 2 segments of 2 ft. (0.6096 m) long 2 X 4 Cut through here. From this side, measure 2.5 feet (2 ft, 6 inches) from one end of the tracks. 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. You only want enough of the bolt so that after it comes out of the arm there is only enough room on either side of the bolt for a 3 washers, 2 bolts and the entire wheel assembly. 3 ft. (0.9144 m.) long 5/8 in. This may need to be changed (1.3462 m) long 2 X 4 This allows us to swap out pins, or adjust forward and backward. So I'm still not sure if i should add it. This will be the finger end of the arm. At the tip of the arm, we welded a steel box around it to hold the pin for the sling release and a loop to tie the other end of the sling rope to. Really cool project Brother, thanks for putting together a great instructable. Keep the hole in between the main track supports and the diagonal track supports. they would be horizontal, not angled. There are two main safety mechanisms: The safety blocks, which prevent the arm from falling, and the second is common sense. Check the alignment of the rails and ensure they are relatively close. These keep the arm straight as it is being loaded and dropped. 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. Or you could buy a longer beam to begin with. Unfortunately, there were some problems in the sketchup base that I made (and could not be easily corrected) that threw off a couple of measurements. Next tape all outside edges so that the perimeter is completely taped. I recommend using a pin, then a thick nail, then a screw and finally a pencil to widen the hole for the string. Then very carefully you will have to put in the safety blocks again and reset the trigger. The sling or pouch, which contributes to acceleration of the projectile and then releases it at the desired launch angle, is often made using polyester rope or other durable thin material. 1 X 6s flex alot. (0.7112 X 0.0889 m) If you do end up building a floating arm trebuchet, please let me know. 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. It's the same process of cutting slits, hammering out the wood and sanding it smooth. Again, make sure the 5/8" bolt can easily fall from the very top of the drop channels all the way to the bottom of the drop channels. Otherwise, the washers in between the CW box and the channel will be smooshed up against the drop channel, creating friction, which is bad. Simulated distance: 316.6 feet. He can back away. so then the long arm would be 3.5 times that 8. ya that sounds good 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.

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