The person standing on the trebcuhet is no longer in danger unless he drops the bolt on his foot. look out for flying cats 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 A small-scale replica of War Wolf, a counterweight trebuchet that uses a boulder-holding sling at the end of a swinging arm. Push one of the corners of the diagonal support next to the bending brace, but keep it one the base. 20 yell heads up, countdown , just make sure everyone know you are firing. It launches 5 pound pumpkins around 320 feet with 250 pounds of counter weight. (0.7112 X 0.0889 m) yes, it works Leave a comment!!! Just as a reminderremember to add glue if you buy pt lumber make sure they are approved for use in it.. 4. Otherwise, make sure they are perfectly aligned and a 5/8 rod can fall through with little friction. Okay now you need to cut the axle. Lastly, make sure everything is square. May need to be hanged if the diameter of the threaded rod is changed X 3.5 in. Scribe the line all the way down the length of the board. Before we start, there were a few problems. This is a general description of how to create a floating arm (f2k) trebuchet. Thinking *this is not funny only annoying* 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. diameter threaded rod, coarse thread This range efficiency can be used to compare actual trebuchets to simulated ones, design The trebuchet, as is, would probably not be able to launch such a heavy projectile, but I'm not sure. Tie a metal loop on one side of the rope to go onto the pin, and tie the other end to one end of the sling. 4.5 these will be used in the trigger diameter threaded rod, coarse thread Jump to page: DocBrown. If you see or hear bumping, look carefully at this back area w/ a video camera or just your eyes to see why it's doing that. Remember to shorten the short arm pieces if you are using a larger ratio that will need to make it shorter. 15. Do you have any instructions or tips perhaps? coping saw and orbital sander (The one I used here) The first recorded use of traction trebuchets appeared in ancient China and were probably used by the Mohists ps-mohist are a scientific lead version of the chinese What is the floating arm Trebuchet, and how does it work? We spent around $300 in lumber and concrete, and several hundred dollars more on metal shafts, plates, etc. long carriage bolts You should also cut off the head if you keep getting downward throws no matter how you adjust it. This was done with the safety bars in place, as well as the chain clicked into the trigger. 7. Keep in mind that the rails should be unobstructed, and the gap where the weight bar will go should be small enough that your wheels can easily glide over it. WebSmall floating arm trebuchet plans. After the first 25 shots or so with the trebuchet, there were two things apparent: the arm could easily be made longer and could greatly increase the range, and the the CW bolt needed to be made stronger. Tighten the bolt as much as you can. 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. Line them up so that their 1.5 inch edge is adjacent to the edge of the 2 ft 1 X 6, and so that their 3.5 inch edge is on the outside cut edge of the long 1 X 6. 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. circular saw (The one I used here) OR miter saw AND table saw Place the weights in the box and screw on the top. Consider how much weight you want to use, and size your shafts and frame accordingly. This is what fit for me. The floating arm trebuchet is a counterweight siege weapon which is a modern variation of the medieval trebuchet. Give it more of a flicking action than a long drawn out flinging. That's its fault. Oh man that is awesome. Right now, I'm trying 3/4", but I'm still fixing the trebuchet and haven't tested it yet. Two last things How much will this cost? 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. Then just screw the bolt through when you need to. They keep the side-to side motion of the tracks to a minimum. Grab the trigger pins. It may take you a few tries, so cut carefully an take small amounts of wood off, checking the angle after each cut so you don't overcut it. Next tape all outside edges so that the perimeter is completely taped. I see you mentioned you built 2. 2. 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. 9. 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. 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. (0.7112 m) long 2 X 4 diagrams showing the medieval trebuchet design vs. the modern floating arm trebuchet, and brings in the relevant math as well. For the arm assembly on Introduction, do you have the exact dimensions of the final product. This is the only part of the trebcuhet that can vary a lot. on Step 15, This is stellar. Does it take a small army to transport it? 8 matching cut washers We are to have a constructed trebuchet and have it prepared to launch on Tuesday, April 23. of the projectile, the height of the counterweight, and the sling and arm angles. Push them up against the drop channel. Take off the drop channels completely so you can cut through here. (remember the CW is supported by the trigger at the beginning, and the the trigger is screwed directly into the drop channels. ) you need to miter, rip, and crosscut. Since one is steeper than the other, this meant that the vertical height ended up different. I would like to work on the floating arm trebuchet because the design of it is more interesting and D Place the hole for the counterweight bolt about an inch and a half from the end. Use the top bolt for screwing in, and the bottom one for unscrewing. Ask me if you have a question. So if I could toss the weight a 100yds would be perfect. (Note: rope angle of 45 is different than arm angle of 90-105) Nylon rope held fine, but it stretched every time we fired, making fine-tuning tough. Make matching steel plates and drill holes into them for bolts and for both the counterweight bar and the axle, allowing room for steel pipe inserts. Everything should be centered. For this you will need your circular saw, sander and the claw hammer if you don't have a router. I lined up the holes with the dowels and hammered home. Taper the arm from a full 3" at the axle to 1" at the finger end of the arm (Fig. nut, washer, guide block, wheel and bearings (Go together) , guide block, washer, nut. The hardest part, really, is getting the angles correct and then cutting them accurately. diameter threaded rod, coarse thread All you are really doing is putting the arm in the drop channels. Could be built in probably a few weekends. Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. Ok the longer support will go on the side where the track is longer, the side that the drop channel is farther away from. I would love to see it while being constructed and finished. Diagonal Track supports. A good way to estimate the range is to use conservation of energy. Look at the pictures for alignment. 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. This kit is professionally engineered, designed and manufactured in the USA. thick wood, 2 ft., 5 in. (I saw a car roof get crushed by a pumpkin flying backwards)Use a long trigger rope and keep yourself at a safe distance.Have fun. Again, use a bowline knot. 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.. This still does not include the 2 X 6 pieces or any other pieces of plywood. The design and construction of such machines is a popular project assignment in post-secondary engineering classes. Lastly, Again, the lengths can be changed slightly, but you want at least 22 feet of length away from the trigger pins when you fire. again for the threaded rod 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. 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. the next 3 specifically show the dimensions for the short side. To reduce friction of the sling on the launch track, the track should have a smooth surface.[5]. by 2 in (0.381 X 0.0508 m) It should be easy enough to follow. Again, this is not a critical dimension, something near that would work. 8. It's a little bit tricky to get the angles perfect. Use plenty of screws as well as resin, gluing and screwing each layer to the next. Reducing the drop distance of the wheel axle to the glide track would reduce damage, but also reduce the range of the trebuchet. here is a link to my The Floating Arm Trebuchet The trebuchet is a medieval gravity powered engine of siege warfare designed to hurl a projectile, such as a heavy stone or a diseased animal, at a distant target such as castles. You also need the braided polyester cord and the keychain ring. Otherwise, the arm would derail a lot more. 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. I like getting comments. Additionally, I would make the arm as long as possible as well. You want the drop channels to be the SAME DISTANCE APART THE ENTIRE WAY up and down their length. Drill the holes for the eye bolts. for the carriage bolts If the weight is very heavy, the long part of the arm can This is a more efficient way to transfer potential energy into kinetic energy at a small scale. The tighten the bolt against the short arm and the bolt on the very outside. 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. You will need the denim and the monkey- no, sorry, gorilla tape. 11. but if you didn't (my bad) You need to recut the drop gap to 1/8" wider than the CW bar, cut the gap in the track slightly wider, and spread apart the track supports directly underneath the drop gap. Project assignment in post-secondary engineering classes consider how much weight you want the drop distance of the arm ( )..., as well as resin, gluing and screwing each layer to the bending brace, but 'm! 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