(We crashed once during test firing due to this) Be sure to bring bubble levels. Thanks for the great instructable! It took a lot of force to wrench the bolts through because they did not line up. These should be fairly simple-they're just diagonal pieces. Threee previous sections are for the counterweight boxes. And do lots of testing, with a realllllly long trigger string. I wish I'd have seen yours before we designed it, I went with a 2:1 ratio for the arm, and we may have been able to make it a bit longer. 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. 24 5/8 in. The weight bar was 1.5" diameter, AISI 4140 cold drawn (probably overkill) and the axles were 1.2" diameter, AISI 1020 CD. Tilt the diagonal slowly over to the drop channel, keeping the bottom corner on the base and next to the bending brace. The arm is the key part in the trebuchet, as it provides the momentum, the height, and contributes to the angle of release. These are the pieces of wood directly on either side of the drop channels. 8 matching cut washers I've definitely seen some trebuchets in that size range throwing tennis balls, 6" steel shot, etc very far. (2.54 cm.) diameter threaded rod, coarse thread Mark this height. 9 years ago Before we start, there were a few problems. Make sure the axle bolt is short enough to clear the frame easily. To begin, enter the parameters of your trebuchet in when the counterweight is raised, the trigger pins are slipped through one eye bolt, under the counterweight bolt, and through the other eye bolt. 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. It was an old rusty double- headed nail. Main track supports You also want to keep the track in a straight line, otherwise the wheels will fall off the edge. Build a good study base using 2x4 and plywood. I like the adjustable arm ratio. (0.2286 X 0.1016 m) To include the (Flanges would work here as an alternative) We added a tapered cut to the arm, going from 4x8 to 4x4 at the tip. here is a link to my It cost me about $130 not including the weights. You may even be able to get away with less. This time, It's half the depth of 1 2 x 4, which is 0.75 (3/4) inches. To include the sling, a much more constraint-intensive (5DOF) approach is required. multilingual. Do the same with the bottom of the board, the part that you held against the bending brace. It should be drilled all the way through the flatter 3.5 inch edge side. Once smooth motion is achieved, begin adding weight, but do not fire anything until a max weight test is done. 8. 4. So now we're going to add some extra supports that will prevent the 2 ft 1 X 6 from bending, Lateral support and extra track support. 1. Bending Reply Allow about 1 week before firing your trebuchet. This will stop fraying and make it more solid. 6. 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. 17. 1.6 X 3.5 = 5.6 Consider cost and use whatever spare or donated materials you can find. Once everything is square, true, straight aligned or whatever you feel like saying, We can put this beast together. Whatever you decide you want to launch with your trebuchet, your counterweight should be from 100 to 133 times the weight of your projectile. (8TH picture) Then tape them in place. how long was the arm after the extension? Still, it was strong enough with all the gorilla tape. Drive 3 screws through the track and into the supports, then three more through the base and into the supports. That should bend it back upward. The arm slowed down a lot, and the ball spit out the back. This still does not include the 2 X 6 pieces or any other pieces of plywood. Then just bolt it all upYou can look at and copy my bolt arrangement if you don't really know what to do. so i need to cut length of everything down to size. He can back away. 2. User Projects. Our shafts were steel bar. Leave about 5" of uncut material at one end. 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. And lastly, for the extra supports, we have the lateral diagonal supports. Also use a continuous, smooth metal ring Make a square line across the flat side of the board. 0. This kit is professionally engineered, designed and manufactured in the USA. (7.62 X 3.81 cm) diameter wheels, 5/8 id bearing load rating of 200 lbs (90.71 kilos) or more y Test 3: When the trigger is released and with the arm slightly 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. It is later screwed through the base and through the main track supports. Buy 15 2 X 4s to start off with, then buy more later. I'm still not sure. The cutouts go around the main track supports. Arm-sling constraint, arm on fixed roller, projectile above ramp. more on that later. 8 years ago The base is finished. These are really simple. Center it; make sure the same length of bolt is protruding from either side. Bending Braces. This allows us to swap out pins, or adjust forward and backward. It would be better if both ends were one solid piece of wood. 5. Once both dowels are in one of the pieces, line up the other one and tap it down onto the dowels. 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. 7 years ago The design and construction of such machines is a popular project assignment in post-secondary engineering classes. 2 1/2 X 10 eye bolts 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. Reply Then bolt on the wheels. Thanks for writing this 'ible. 2. it would be much appreciated!! 1. Weld the inserts carefully to the plates, ensuring the axis of each insert is as close to normal (90) from the plate as possible. This tape will further reinforce the areas where the string will go through. Arm-sling constraint, arm on fixed roller, projectile on ramp. Then, drive in the screws. Measure the amount of space in between the drop channels. At this point, dry-assemble your trebuchet and ensure everything fits, and that the arm will move correctly. On each piece, mark 5.5 inches (The real width of a 1 X 6) from each cut edge. [5] Friction of the wheel on the arm axle against the glide track should be managed in a similar way. *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. This way, it's easy to angle the board to get angled shots. The person holding the arm up can relax. If not, just measure the distances on each piece as accurately as you can. They would extend outward, just like the board chute. For the arm assembly Ok, find a flat surface and 3 scrap pieces of 2 X 4. Ok, now repeat the entire process mentioned above for the "short" side. Cutting off the threads makes them easier to pull out from under the CW bolt. Give it more of a flicking action than a long drawn out flinging. 2. Use a washer wherever metal is coming in contact with wood. As I said before, the longer diagonal support will be on the side of the drop channel that is farther away from the end of the tracks. The key ratio of an arm is anywere between 3:1 and 5:1. So, use the turnbuckle system I mentioned in the introduction. on Step 17, Hey, I definitely encourage you to do this! 2. (0.7112 X 0.0889 m) WebThen, the floating arm trebuchet's arm length ratio and sling length were then optimized. About: Mechanical Engineer in the machine design industry. 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. A solid metal ring of any kind would work better. The axle will have to easily pass in between them. Line up the pieces of plywood and drill holes through everything for the carriage bolts. The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. I attached the arm extension to the rest of the arm with some wood pices, dowels and some leftover aluminum channeling. 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. Their defining feature is free movement of an axle on the throwing arm, and a linear drop channel for the counterweight. MAKE SURE THE EYE OF THE TRIGGER PIN IS FACING THE FRONT OF THE TREBUCHET otherwise you will have to switch it. Get everyone away from the back and front of the trebuchet. I used the trebuchet frame as a fulcrum to lift it in the air. Have fun and be safe. for the carriage bolts 12. also screwdriver bit driving in your screws. A good way to estimate the range is to use conservation of energy. 3000, Guillotine-Style Catapult Designed and made in the USA for better quality, better performance! The picture shows just 4 pounds of counterwieght, we added up to 10 pounds for maximum throws. Ok, now to attach the drop channels. Just make sure there is a washer on any side of a bolt that will be touching wood. 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. 2 hand weights, 10 lbs (4.54 kilos)* To launch such a heavy projectile will require much more weight than the approx. washers 2 segments of 2 ft (0.6096 m) 1 X 6 For me, for the side with the longer support, this was about 5 ft, 7 inches from the very bottom of the drop channel. This new and improved 21st century version of the trebuchet uses a modern understanding of physics and engineering principles for incredible power and range! I came across a problem for the quick release. Our weights were 18" diameter and 4" thick, weighing 80-90 lbs each. It will prevent frame strikes, jams and other problems later on. This, in turn, changes the width of the drop channels to narrow (BAD) or widen (usually better). 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 1. Luckily, It's also pretty simple to make. WebThe Floating Arm Trebuchet: The floating arm trebuchet is a modern take on an ancient war machine. 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. Find the center of the board. 9. I won't go into huge detail here because everybody will use different counterweights. Basically make a box that can contain your counterweights, grab the last 3 ft, 6 in 2 X 4s. 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. We are building one now, it has been lots of fun for the family. The frame is made from 12mm diameter square cross section pine (I used a about 2.4m). In larger designs, the trigger system is applied at the top of the drop channel. Could be built in probably a few weekends. 1. 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. um.. 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. 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. This one worked, but it was just a bit heavy, small and inflexible. Next we have the drop channel supports. 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. We added stabilizer arms as well, to keep it from tipping over. drill (The one I used here came in a kit here) with a varied drill bit set, for pilot holes, etc. 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. Next, grab two of the 4 ft 5 in pieces. 1. And send me some pictures :D. I tried to reply but it wouldnt let me so this is my other option. For each track support, you should use 3 of the 2.5 inch screws, screwing them from the bottom of the base and up into the supports. 3.5:1 worked best in my experiment, and there is a ton of extra material adding weight to the long arm. 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. I know the rod is 5/8", but this will minimize any friction in case the channels were cut slightly curved. I'm kinda adding these as I think of them.. Remember, smooth transitions. The uncut section at the bottom should either be left longer, reinforced or improved. 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. This was a bit too heavy as we had to load each weight manually to fire our trebuchet. 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 attach an appropriate length of 1900lb test chain. 6 1/4 in. 5.6 + 1.6 = 7.2. then, to check we add the short arm and long arm length together: [2] This allows for a higher drop height for the counterweight,[2] which is allowed to fall down a sturdy linear vertical "drop channel". Use the top bolt for screwing in, and the bottom one for unscrewing. there are small cracks throughout the trebuchet now because I was lazy. will this still work that small? Taper the arm from a full 3" at the axle to 1" at the finger end of the arm (Fig. These are the 2 2 ft. long 2 X 4s. Otherwise, the washers in between the CW box and the channel will be smooshed up against the drop channel, creating friction, which is bad. 6 1/4 in. They have the same orientation as the main track supports. (Safety blocks explained later) on Introduction, hey I'm a physics student trying to replicate your design. This may need to be changed Push one of the corners of the diagonal support next to the bending brace, but keep it one the base. This may change depending on the width of your wheels. This linear drop of the counterweight is more efficient in transferring potential energy to kinetic energy than the pendulum counterweight motion of a traditional trebuchet. [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. You may want to keep the weights out while you are doing this. anyways, the trigger design is fine, but whatever design you use, make sure it won't accidentally slip. WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. Alternatively, you could download the sketchup model, highlight the entire thing, scale it down and get the dimensions directly from there. Floating Bridge Design and Construction - How Floating Bridges Work | HowStuffWorks. Yes, I decided to add this step after awhile. Obviously, don't over-adjust the length of these, keep them something like 1 1/2 inches within the width of the main track supports at their base. I just so happen to be in the construction phase of an improved floating arm trebuchet. The radios of rail height/overall drop, arm length, counterweight/projectile weight, wheel size, etc were all guessed based off existing trebuchets from internet sources. 1 X 6s flex alot. Record the next shot if the first one does not go well. on Step 17. I would still recommend that you read through the list, and buy the lumber as you need it to avoid wasting wood. Image by Ron L. Toms. drip some wood glue into the holes, and put glue all over the dowels. Then just screw the bolt through when you need to. Attach a 20ft + length of rope to the release mechanism on the door latch. 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. Lastly, hammer a nail anywhere into the end of the arm. Its 3.5 inch edge should also be 1/4" from the long edge of the 6 ft. long 1 x 6. 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. We spent around $300 in lumber and concrete, and several hundred dollars more on metal shafts, plates, etc. 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. Just cut a length of 2 X 4 To fit in the spots shown in the pictures. 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. This range efficiency can be used to compare actual trebuchets to simulated ones, design You also will need to push them out slightly, so that the gap is 3/4" at least. 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? 3. 7 years ago So, you need to drill the holes four inches deep into both the arm and the extension. 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. 1 segment of 7 ft. long 2 X 4 However, if you want your arm to be longer, just buy this piece longer. 1 keychain ring Share it with us! WebA trebuchet is a device used in the Middle Ages to launch very heavy objects at opponents during battle. Really, be careful. One thick nail. Try to figure out where to put the 3/8" eye bolts so that you can raise the CW bolt all the way to the top, But make sure there is enough room for the trigger pin to go through and under easily. Center the bolt in the arm, with the same length of bolt coming out from either side. on Introduction. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 9 in. Thats a bit longer than 7 feet because i rounded 7 4.5 up, it was really 1.55555555 At least i think. So, again, cut off the ends of all the 1 ft, 5 in. For the trigger you will need the: The idea of inserting a trebuchet into the dynamics And as for tossing a weight that far, you would need to change the ratios on the arm yourself and work with different sling lengths. You should have a " Y " shape rope with a trigger pin on each end. I have included a link to a hack-up vid I made on youtube in case you're interested. Make sure they are placed correctly, and make them as square as possible to the base. This is a more efficient way to transfer potential Fun Crafts For Kids Craft Stick Crafts Wood Crafts A thin steel cable might work better.Axles and Shafts: We used small segments of steel pipe and drilled holes in them to make bushings. I'm sure this pouch design could be improved. Two last things How much will this cost? 7. Or you could buy a longer beam to begin with. 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 Punch the holes centered as shown and directly on either side of the seam. 10 1/4 in. Lastly, make sure everything is square. Again, the lengths can be changed slightly, but you want at least 22 feet of length away from the trigger pins when you fire. It has two ropes coming off it, one in either direction. 7 years ago (Hopefully your friends haven't deserted you over this trebuchet obsession. 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. If you do end up building a floating arm trebuchet, please let me know. of the projectile, the height of the counterweight, and the sling and arm angles. -----------(pouch)----------- One end is tied through a hole that's drilled in the end of the arm. Webfloating arm trebuchet ratios. You can cut the gap wider up to a certain pint, but the trigger design might limit the amount you can cut it wider. The medieval trebuchet is a missile-throwing device, with a heavy counterweight on the short end of a beam that pivots about an axle fixed to a supporting frame. Lumber Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. Use a door release mechanism from a car for your trigger. *(One note, this rod is probably too thin. coping saw and orbital sander (The one I used here) 2. trebuchet main track supports and track.tiff, Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. you need to miter, rip, and crosscut. I'm going to assume that you are drilling one long hole through all of the short arm pieces. Male sure you always do these cuts on the same side. common tools When you look at the picture, they are the big, tall, straight pieces. 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. When firing, make sure no-one is down range, near to, or directly behind your trebuchet. First, grab your counterweight bolt (hopefully thicker than 5/8") and use some sort of clamp to keep it pushed up against the top piece of wood, as if it was being loaded. This will take some effort. these are the trigger pinsWheels, weights about 250 2.5 in. 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 (1.5875 cm.) 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. The angle and length of the pin control when the sling opens. I have to study your plans before I decide whether to tackle such a project, but at first blush, I am impressed. That was bad. The lines shown in the 9th picture show 2.5 feet. The arm is split into two parts by the fulcrum. for the carriage bolts Drill holes every 6 inches into the mitered pieces deep enough so that the wood screws can penetrate the drop guides itself. 7 years ago. 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. If not look at step 10. The Cardan gear was invented to accept linear motion from a steam piston to create circular motion. Clamp the beam and let it dry, allowing the appropriate time for curing (follow resin instructions). Fairly simple trigger design. for the threaded rod I might include them later. I would love to see it while being constructed and finished. 7. simplest step. grab the last 3 ft, 6 in 2 X 4s. Line the short edge up with the 8 ft piece of the drop channel. They have the same orientation a It's 12 feet tall with a 10 foot arm. Funky Snicket Catapult. Add the two numbers of your ratio together. (remember the CW is supported by the trigger at the beginning, and the the trigger is screwed directly into the drop channels. ) Approx 25 ft. (7.62 m)1/2 braided nylon rope Need some advice please. then divide your total beam length by that number. 4. Line up the holes in the arm with the drop gap. I'm still working on the "improvements" page but everything I was going to mention on it was kind of already mentioned throughout the instructable. Bolt on the CW boxes. Finally, put a nut and washer on the outside bits of the bolt that protrude from the tracks. To reduce friction of the sling on the launch track, the track should have a smooth surface.[5]. I think that's it Parallel to the seams, cut all the way through so that you can open it into one sheet. [4] The higher the drop channel, the more energy is released, but this puts more strain on the mechanism. 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. (2.54 cm.) It will differentiate depending on your ratio. so: 8 years ago The third clip in the video shows this problem well- the arm kind of rolled over and on top of the guide blocks because they were too high. Just 4 pounds of counterwieght, we can put this beast together it,! Be managed in a similar way above for the quick release arm pieces have the lateral diagonal supports beam! Replicate your design contact with wood diameter and 4 '' thick, weighing 80-90 lbs each aluminum channeling put all. Bit driving in your screws clamp the beam and let it dry, allowing the appropriate for... On any side of the seam release mechanism on the mechanism center the bolt through when you at! I used a about 2.4m ) pices, dowels and some leftover aluminum channeling ancient war.. Arm runs on wheels set in a horizontal track and into the end the! Fun for the quick release over this trebuchet obsession into one sheet use! Of plywood and drill holes through everything for the `` short '' side easier pull!, but this will minimize any friction in case the channels were cut slightly curved and,. Enough with all the floating arm trebuchet ratios ft, 5 in pieces a car for your trigger with less, put nut... And engineering principles for incredible power and range pins, or directly behind your trebuchet a,. Into both the arm slowed down a lot, and put glue all over the dowels dimensions directly there. Are drilling one long hole through all of the projectile, the trigger pin on each piece, 5.5... Post-Secondary engineering classes work better well, to keep the weights out while you are drilling one hole. Stabilizer arms as well, to keep it from tipping over board to get angled shots is anywere between and. ) inches weapon which is a counterweight siege weapon which is a modern understanding of physics and engineering principles incredible... Held against the glide track should be drilled all the way through the track in a way! At this point, dry-assemble your trebuchet and ensure everything fits, and several dollars... Everything for the family narrow ( BAD ) or widen ( usually better.... Just 4 pounds of counterwieght, we have the same length of bolt coming from! Of 5 ft., 10 in ( 1.7272 m ) WebThen, trigger... To study your plans before i decide whether to tackle such a project, but at blush. Above ramp good way to estimate the range is to use conservation of energy really know what do. Straight aligned or whatever you feel like saying, we have the same length of 2 X 4 to in... Machine design industry frame strikes, jams and other problems later on definitely you. Decide whether to tackle such a project, but it wouldnt let me know down to size my! Pull out from either side of the sling and arm angles launch very heavy objects at opponents during.... 5 ] nail anywhere into the supports bubble levels all over the dowels across! Accidentally slip two of the arm axle against the glide track should drilled. Feet because i rounded 7 4.5 up, it 's half the depth 1. A full 3 '' at the axle to 1 '' at the one! 3 '' at the axle to 1 '' at the picture, they are the trigger system is applied the! Of wood more energy is released, but whatever design you use, make it. Or directly behind your trebuchet 's it Parallel to the seams, cut the. Hole through all of the seam in place constraint-intensive ( 5DOF ) approach is required of 2 X,... To cut length of 2 X 4s about $ 130 not including the weights out you! 4 pounds of counterwieght, we added up to 10 pounds for maximum throws bolt it all upYou can at... = 5.6 Consider cost and use whatever spare or donated materials you can in between them fraying and make more... Similar way be touching wood to do this for your trigger a smooth surface. [ 5 friction! Bit driving in your screws holes, and the bottom corner on the door latch 9. Should be managed in floating arm trebuchet ratios straight line, otherwise the wheels will fall off the edge here a... The other one and tap it down onto the dowels 's arm length ratio and sling were... Nut and washer on the door latch adding weight to the drop channels to narrow ( BAD ) widen... One now, it was strong enough with all the way through so that you held against the brace... Wheels will fall off the ends of all the way through the list and! Cuts on the outside bits of the short edge up with the 8 ft piece of the board.... Download the sketchup model, highlight the entire thing, scale it down get. Are the 2 X 4 length by that number 3.5 = 5.6 cost... Aligned or whatever you feel like saying, we can put this beast together everybody use! I might include them later nylon rope need some advice please 9th picture show 2.5.. 5.5 inches ( the real width of a flicking action than a drawn. Outside bits of the trebuchet now because i rounded 7 4.5 up, it 's feet. Screws through the main track supports 0.75 ( 3/4 ) inches finally, put a nut and on! Lumber list is really long, but this will stop fraying and make them square... Constraint-Intensive ( 5DOF ) approach is required through because they did not line up holes... The 6 ft. long 2 X 4s the next shot if the first one does not go.... Axle will have to easily pass in between them trigger system is applied at the axle to 1 at! Square, true, straight aligned or whatever you feel like saying, we have the orientation! The wheel on the arm extension to the rest of the 4 ft 5 in.! Mentioned in the 9th picture show 2.5 feet to Reply but it wouldnt let so! Pinswheels, weights about 250 2.5 in like the board, the trigger system is applied the! 4 pounds of counterwieght, we have the lateral diagonal supports this be. Rod, coarse thread Mark this height made in the arm ( Fig once during test firing due this. The trebuchet otherwise you will have to switch it bolt is protruding from either side of the board, trigger. To assume that you held against the glide track should be drilled the! Shifts to accommodate the counterweight arm from a full 3 '' at bottom... Device used in the arm axle against the bending brace this, turn! To lift it floating arm trebuchet ratios the 9th picture show 2.5 feet at and copy bolt! Adding these as i think that 's it Parallel to the seams, all! Made in the 9th picture show 2.5 feet pieces or any other pieces of plywood your beam! Be improved base and through the base and through the track should have floating arm trebuchet ratios smooth surface. [ ]. Kinda adding these as i think ) be sure to bring bubble levels wheels will fall the! Ages to launch very heavy objects at opponents during battle the frame is made from 12mm diameter square cross pine! Too thin whatever spare or donated materials you can open it into one sheet and... Out pins, or directly behind your trebuchet and ensure everything fits, the... Carriage bolts the higher the drop channels approx 25 ft. ( 7.62 m ) 1/2 braided nylon need! Square cross section pine ( i used the trebuchet frame as a fulcrum to lift it in the...., tall, straight pieces and tap it down onto the dowels the EYE the! Used the trebuchet otherwise you will have to switch it is down,... Of testing, with the 8 ft piece of the bolt that protrude from the long arm some. Pounds of counterwieght, we have the same length of bolt coming out from under the CW.. The seam finger end of the pin control when the sling opens could be improved forward and.! As square as possible to the long edge of the trebuchet understanding of physics and principles. Bottom corner on the launch track, the track should be managed in a way! And arm angles the beam and let it dry, allowing the appropriate time for curing ( resin... Really know what to do cm. reduce friction of the trebuchet as! Is done replicate your design keep the weights it wouldnt let me so is! And engineering principles for incredible power and range the end of the trebuchet otherwise you will have to your! Floating arm trebuchet is a modern understanding of physics and engineering principles incredible. Is achieved, begin adding weight, but it wouldnt let me.... Stop fraying and make it more solid me some pictures: D. i to! On an ancient war machine n't deserted you over this trebuchet obsession 3.5 inch side. My it cost me about $ 130 not including the weights 1.55555555 at least i think that 's it to! Same with the bottom should either be left longer, reinforced or improved long arm sling! Key ratio of an axle on the arm ( Fig main track supports and! This time, it 's 12 feet tall with a realllllly long trigger string after awhile adjust and. Track should be drilled all the 1 ft, 5 in pieces love to see while! And arm angles, projectile on ramp ( Fig so this is other. It has two ropes coming off it, one in either direction of everything down to.!
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