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. Pulling this should make the trigger release. Arm-sling constraint, arm on fixed roller, projectile on ramp. It would be better if both ends were one solid piece of wood. 4 segments of 4 ft., 5 in. Basically make a box that can contain your counterweights, whatever they are. Start by cutting the pieces of plywood. Make sure that there are no cracking noises or flexing from the joint. (0.7112 m) long 2 X 4 I like things that go boom and sushi, preferably at the same time. It should be drilled all the way through the flatter 3.5 inch edge side. They are fairly simple to make. WebFloating Arm Trebuchet. Unless I've forgotten something, I think we're done. Because we are about to cut the tracks in half. A good way to estimate the range is to use conservation of energy. 1.6 X 3.5 = 5.6 Arm-sling constraint, arm roller on fixed track, projectile above ramp. And it is constructed with 1 X 6s The ridges would sometimes catch on the heads and sometimes not. 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. We just built an hinged counterweight trebuchet for our annual group camp of friends from highschool (we're all in our 30s now.). Hey I just made that up right now. If you are going to use a thicker CW bolt, you need to make the drop gap wider. on Introduction, The length of the end of the arm to the center of the sling should be 1/2- 2/3 the length of the entire arm. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 5.5 in (0.2413 X 0.1397 m) Now, drive 2 screws through the mitered pieces on the side, and straight into the track. This is the pin. 9 years ago Need some advice please. Actual distance: 300 feet. therobotichand, would you mind posting any materials or tutorials you used? Or you could use the angles I give you. Don't judge me) So if I could toss the weight a 100yds would be perfect. Have fun and be safe. You can always add on later, but it's easier to get a long enough one in the beginning-before you glue everything together. So, if you want them to be the same height, you may need to change the angles or the lengths mentioned here. Thank you for reading through all this, and let me know if you actually build this monster!! 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. The classic beam ratio for a FAT is 2:1. I keep them in one of the mitered side support screw holes so I can easily reach them once I get the CW to the top. Then, measure 3/8" from either side of this mark. Circuits | Floating Arm Trebuchet : 7 Steps (with Pictures) - Instructables ), Reply Quickly, before the other guy gets sore holding the arm, the person on the trebuchet will need to slide some scrap 2 X 4s around a foot long over the gap in the track. So, you need to drill the holes four inches deep into both the arm and the extension. Also, 1 inch thick wood would would be stronger.Hardware 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. WebThe Floating Arm Trebuchet: The floating arm trebuchet is a modern take on an ancient war machine. If you really want to include them, they should also be cut about 3 inches longer, until you know what to cut. But make sure you go to the website for wheels that I recommended in the Instructable to avoid paying too much for wheels. Now comes the fun part. 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. It is later screwed through the base and through the main track supports. The person on the ground should pull back and down on the arm like a lever, using the guide wheel as a fulcrum. The oddity with this trebuchet is that it has no arm ratio as the counterweight sits at the very end of the arm, and the arm itself tends to be shorter. Spread them out evenly and make sure none of the holes go through the bolt holes. [3] If you Keep everything tight. *look at the last step: improvements. The wheels were fixed in a similar fashion, and axle grease was used to lubricate the wheels. thank you, Reply i will keep that in mind. These can be found cheap at any junkyard. Leave a comment!!! extra lateral support ), but I came up with distances reasonably close to the actual performance. 4.5 The arm slowed down a lot, and the ball spit out the back. Trebuchets work by using a counterweight system turning the falling energy of the back end into a high speed launch of a heavy S Kei Sco Table Saw Sled Marble Machine Plan Drawing All The Way Down Viera Stick It Out Things That Bounce Element Simulator. these will be used in the trigger circular saw (The one I used here) OR miter saw AND table saw Make sure there is glue all over them. 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. Otherwise, the washers in between the CW box and the channel will be smooshed up against the drop channel, creating friction, which is bad. As long as it's a strong, flexible cloth pouch that is big enough to wrap around your projectile, It's fine. Tie the each end of the four foot piece to one of the trigger pins. 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. Next tape all outside edges so that the perimeter is completely taped. All you are really doing is putting the arm in the drop channels. Awesome! http://youtu.be/MS9OepeTELc, Reply How would this work at half the size? Make sure the washers do not interfere with the drop channel. Remember to shorten the short arm pieces if you are using a larger ratio that will need to make it shorter. Okay, now I'm not kidding. I would probably actually be dead. the beginning Ok, so this is what the entire bulk of the trebuchet rests on. nails will slide out of the wood, and will not keep the box together. Put them in that corner, towards the inside. It may have thrown some little thing off so just use your judgment about the angles. Center the wheel in the middle of the guide blocks and the wheel with the guide blocks in the middle of the tracks. 6 segments of 2 ft., 5 in. Cutting off the threads makes them easier to pull out from under the CW bolt. 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 book is a compilation of step-by-step instructions for how to build nine different types of catapults and trebuchets, including plans for: A PVC Pipe Trebuchet, A Tabletop Trebuchet, The World Famous Floating Arm Trebuchet, The Historical WarWolf Trebuchet, A Rat-Trap Catapult, The Mangonel (or Onager), The Greek Ballista, a erm WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. Trebuchet 3: An Improved Floating Arm Trebuchet. 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. .and several of the bolts for the 5/8" threaded rod. 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? These are the horizontal beams that are used as the track. 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. WebFloating Arm Trebuchet - Hobbyist Version The F.A.T. although I'm still not quite sure how that happened. Mark the height that you want the diagonal support to rise to. on Step 15, This is stellar. ya that sounds good 20 yell heads up, countdown , just make sure everyone know you are firing. 10 1/4 in. Well, for me, it wasn't really a chute. 7. The uncut section at the bottom should either be left longer, reinforced or improved. on Introduction. 5. Beside the arm when it's at rest, these two channels are the tallest point of the trebuchet. When you look at the picture, they are the big, tal Lastly, Use plenty of screws as well as resin, gluing and screwing each layer to the next. If you need more help with the guide blocks let me know. I might include them later. The guide blocks can be any shape you want, but look at the picture notes below for shaping. on Step 17, Hey, I definitely encourage you to do this! The floating arm trebuchet uses a counterweight held on top of a tall drop channel to transfer potential energy into kinetic energy. Use your head before you lose your head 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. I have real pictures, but no sketchup ones. 50 ft. (15.34 m) of 3/16 (0.47625 cm) braided polyester cord You're going to have to do some testing and fiddling to find out what works best. Always stand way back from the trebuchet, and keep the safety blocks in place until you are ready to fire. Your arm should look nice and smooth like the pics. [2] This causes the wheel on the axle of the arm to impact the glide track,[2][8] which is usually held steady with strong support beams. (0.635 cm) washers, matching carriage bolts diameter threaded rod, coarse thread A note about the guide blocks: For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. Otherwise, The arm will get puched over and on top of them, slowing down the arm a lot. The arm can be longer than your sheet of wood, but make sure the gaps between the pieces are in different spots for each layer. It's 12 feet tall with a 10 foot arm. To dowel the pieces, simply drill two holes into both the arm and the extension. Double- check everything. WebThere are no really detailed descriptions of medieval or earlier trebuchets that give, for example, the dimensions or shape of the beam, the ratio of its long arm to its short arm, and so on. um.. (15.24 cm.) if theres is any other advice that you can give me (especially for it being smaller) it would be a lot of help. Look at the pictures for alignment. War Wolf was the largest trebuchet ever made and was rumored to send boulders of about 150 kilograms across a distance of over 200 meters. 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. when the counterweight is raised, the trigger pins are slipped through one eye bolt, under the counterweight bolt, and through the other eye bolt. I've uploaded PDF's of the CAD drawings as well as a general schematic diagram for an f2k. Heavier projectile= earlier, lighter projectile = later. ) Alternatively, you can attach a heavy weight such as a 20 pounds (9.1 kg) hand weight directly to the end of the arm. Please comment for any Attach a 20ft + length of rope to the release mechanism on the door latch. Harmonic balancers work well for wheels, and can be pulled from a V8 engine at a junkyard. Check the alignment of the rails and ensure they are relatively close. Also, if I mention anything else in the instructable that I didn't mention here, let me know.Materials 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. The more you pull the edge over the other one, the deeper the pouch will be. Cut the threads off of the long eye bolts. i am building a trebuchet for my physics class. First, the two pieces are drilled and doweled. 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. Trebuchet. The first through fifth sketchup picture will show this. A pair of wheels allows the arm to roll along F Building of Vertical Supports F 2x3 28in Build functioning catapult Torsion or trebuchet Maximum volume 227,000 CC Minimum Volume 125,000 CC I would love to see it while being constructed and finished. Again, make sure a 5/8" bolt can easily fall through. 7. I used the trebuchet frame as a fulcrum to lift it in the air. for the sling A four foot piece and 21 foot piece. anyways on Introduction. Clamp the beam and let it dry, allowing the appropriate time for curing (follow resin instructions). The arm wasn't too hard to extend, BUT whatever you use to join the parts MUST be strong enough. 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. On the other end of the sling, tie another rope that goes to the loop on the end of the arm. Cut a piece of steel pipe for an insert and place it at the center of each form, then pour the concrete. The pinis crap. It's a little bit tricky to get the angles perfect. Image by Ron L. Toms. Luckily, the exact size of these supports doesn't matter too much. you need to miter, rip, and crosscut. The key ratio of an arm is anywere between 3:1 and 5:1. The picture shows just 4 pounds of counterwieght, we added up to 10 pounds for maximum throws. WebThen, the floating arm trebuchet's arm length ratio and sling length were then optimized. Mark the line directly across the flat face of the track, perpendicular to the long edge. so i need to cut length of everything down to size. 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Basically make a box that can contain your counterweights, whatever they are relatively close bolt holes threads...
