Use a door release mechanism from a car for your trigger. 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. Lengths Lengths Angles Masses Density Copyright 2013, Eric Constans and Rowan University these are the trigger pinsWheels, weights 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. Really cool project Brother, thanks for putting together a great instructable. rubber mallet the beginning Ok, so this is what the entire bulk of the trebuchet rests on. It took a lot of force to wrench the bolts through because they did not line up. Luckily we caught it and injuries were avoided. At least i think. You want this to happen when your sling is at 45, and it will vary somewhat with projectile weight and counterweight.The sling itself and release pin are a bit of trial and error. on Introduction, hey I'm a physics student trying to replicate your design. (8TH picture) Then tape them in place. 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? Approx 25 ft. (7.62 m)1/2 braided nylon rope I know the rod is 5/8", but this will minimize any friction in case the channels were cut slightly curved. Remember the bumping problem. I would still recommend doing one, though. so i need to cut length of everything down to size. First, pick one end of the trebuchet to be the back. COMMENT RATE 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. Now, I believe that the width between the bottom of the main track supports is somewhere around 1 ft, 1 inch. 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. Lastly, make sure everything is square. denim fabric (Look at the picture) Really hope we get the hooks and sling parts to make trebuchets wor Basically make a box that can contain your counterweights, whatever they are. Approx 25 ft. (7.62 m)1/2 braided nylon rope 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. Thank you for your generous gift to the DIY community. On the fraying edges, use only one strip and fold it over. I attached the arm extension to the rest of the arm with some wood pices, dowels and some leftover aluminum channeling. Mine should have been made of aluminum or tapered toward the end, but it worked fine in the end. Okay now you need to cut the axle. [2] The difference in the lengths of the two ends of the arm provides mechanical advantage. Next we have the drop channel supports. Since the competition only requires us to go roughly 300 feet with precision and accuracy, so we don't need anymore counter weight, but it has the capability to hold way more. 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. First, the two pieces are drilled and doweled. Tie the longer end of the rope through the hole in the end of the arm. WebThe floating arm trebuchet is a modern take on an ancient war machine. Make sure the axle bolt is short enough to clear the frame easily. Our shafts were steel bar. If you need to beef things up, like the counterweight bolt and wheels, it might cost more. on Step 17, Hey, I definitely encourage you to do this! i am building a trebuchet for my physics class. Just as a reminderremember to add glue You also need the braided polyester cord and the keychain ring. This still does not include the 2 X 6 pieces or any other pieces of plywood. WebThis is a floating arm trebuchet. your best bet is to experiment with different sling lengths and pin angles. This will take some effort. http://youtu.be/MS9OepeTELc, Reply 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. multilingual. 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. Pulling this should make the trigger release. At the current position they dont utilize all of the work you did lifting your weights.Here is a floating arm that two other students and I from FRC team 11 MORT designed for punkin chunkin in Delaware. 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. Could be built in probably a few weekends. 3. There are two main safety mechanisms: The safety blocks, which prevent the arm from falling, and the second is common sense. WebFloating Arm Trebuchet - Hobbyist Version The F.A.T. 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. i need to make mine 3x3x3. and if everyone wants the step I'll add it. The part of the war machine that means business. Otherwise, the washers in between the CW box and the channel will be smooshed up against the drop channel, creating friction, which is bad. Although later there are more. Mess around you'll figure it out. To fix this, you get a thicker CW bolt, and hopefully a hardened one. [2] The projectile can be launched at a high velocity.[6]. (Left or right) Unlike now, the humans pulled ropes instead of having a counter weight. Tighten the bolts together, sandwiching the washer. We just built an hinged counterweight trebuchet for our annual group camp of friends from highschool (we're all in our 30s now.). These are the four sections of 1 ft, 5 in 2 X 6. (0.4318 m) long 2 X 4 Grab your nylon rope and cut 4 feet off the end. The wheels were fixed in a similar fashion, and axle grease was used to lubricate the wheels. 2 1/2 X 10 eye bolts 16. 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. Also use a continuous, smooth metal ring Take a break. This means that 3 and 1/2 parts of the short arm plus the short arm itself equal the total length of my entire beam. it would be much appreciated!! I'm sure this pouch design could be improved. The walking arm trebuchet is a good example, which uses an unconventional design to great effect. While this is happening, the wheel is moved backwards by the torque acting on the arm from the counterweight. I 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? Use the order of bolts and washers on either side shown in the first picture (From inside to outside the order is) : drop channel, washer, bolt, washer, CW box wall, Washer, bolt, Bolt, washer, wall of CW box, washer, bolt. 7. One thick nail. lateral supports Place the weights in the box and screw on the top. (while you're there, pull some harmonic balancers from a Chevy 350 engine for your wheels) Toyota or Nissan models work well for the trigger, and ours held with around 1000 lbs of tension on it.IMPORTANT: You should have a separate safety mechanism on your design. Try to determine the problem. Jump to page: DocBrown. They would at the very least be a good guideline. Luckily, It's also pretty simple to make. Diagonal Track supports. When firing, make sure no-one is down range, near to, or directly behind your trebuchet. 4. (0.635 cm) diameter, 6 in. ratio of counter weight to projectile about 90 to 1 weight. But I'm sure you'll get the idea. The arm will not swing up. The arm is on a moving axle and the torqueD|volume=26|doi=10.1088/0143-0807/26/4/002|issue=4}} The forward motion of the axle as the arm rotates adds speed to the projectile end of the arm. Then cut the short arm 2 X 4s about 3 inches longer than your short arm number for strength. 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. Maybe the wood "stretched" and then was kept in place as the glue dried. 3. It includes what I used at the time. "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. Mark this height. Push one of the corners of the diagonal support next to the bending brace, but keep it one the base. The 3/8" eye bolts go at the top of the drop channels. Make sure there is glue all over them. Or you could buy a longer beam to begin with. 2 rectangles of 3/4" in. Now we're finally going to add the last few lateral supports and the guide wheel. The trigger pins keep the weight from falling. Short arm, washer, bolt, washer, wheels and bearings, washer, bolt. If you have a router, it would be easier to do this by just cutting away the material. I like getting comments. The length of the rope will control what arm angle your sling releases at. be safe 1. 4 years ago. 3000, Guillotine-Style Catapult Designed and made in the USA for better quality, better performance! -The box needs to be made narrow enough to fit on the outside of the drop channel and still have room to be loose..that's room for other bolts and washers. Male sure you always do these cuts on the same side. This is the pin. Fairly simple trigger design. 1. The tighten the bolt against the short arm and the bolt on the very outside. Plywood also included in the arm Harmonic balancers work well for wheels, and can be pulled from a V8 engine at a junkyard. circular saw (The one I used here) OR miter saw AND table saw Here's some vid of ours. [2] The eye bolts are usually placed at the bottom of the frame, locking above the arm to prevent accidental release. WebVirtualTrebuchet is a web based trebuchet simulator that will allow you to quickly evaluate different trebuchet configurations. Although they need to be lined up, don't worry too much about the squareness of the main track supports to the base, since that will be corrected by diagonal pieces, from the track supports to the track itself. Hey Chans2901, Thanks for your questions, I love trebuchets! (The counterweight bolt has to be strong enough, too. ) Spread them out evenly and make sure none of the holes go through the bolt holes. These should be fairly simple-they're just diagonal pieces. Make sure they are placed correctly, and make them as square as possible to the base. 3. Here are some stats, note that these apply to the original #2 treb. Also, if I mention anything else in the instructable that I didn't mention here, let me know.Materials The arm is the key part in the trebuchet, as it provides the momentum, the height, and contributes to the angle of release. The person standing on the trebcuhet is no longer in danger unless he drops the bolt on his foot. Keep the hole in between the main track supports and the diagonal track supports. diagrams showing the medieval trebuchet design vs. the modern floating arm trebuchet, and brings in the relevant math as well. The ball did slip out a few times. Virtual Trebuchet is a free web based trebuchet simulator. Drill holes every 6 inches into the mitered pieces deep enough so that the wood screws can penetrate the drop guides itself. how long was the arm after the extension? then divide your total beam length by that number. To include the (1.5875 cm.) 2 segments of 6 ft. (1.8288 m) long 1 X 6 [3] If you Hopefully you'll use a wider bolt to begin with Line the short edge up with the 8 ft piece of the drop channel. (0.7112 m) long 2 X 4 Also, 1 inch thick wood would would be stronger.Hardware All scaled proportionally from the larger version (the tall vertical pieces are 130mm long, throwing arm 150mm). That was bad. This is it. The arm is done. The distance that it extends out from the diagonals affects the distance a lot. Socket wrench for your threaded rod 2 segments of 2 ft (0.6096 m) 1 X 6 on Step 15. X 1.5 in. Make a square line across the flat side of the board. 9 years ago Do some experiments, that part is the most fun. Still, it was strong enough with all the gorilla tape. NOTE: all CAD modeling was done using student software, for educational purposes. Just get several throught the drop channel assembly and into the track. WebThe Floating Arm Trebuchet: The floating arm trebuchet is a modern take on an ancient war machine. Tighten all the knots and make sure none will slip. I see you mentioned you built 2. This was a bit too heavy as we had to load each weight manually to fire our trebuchet. This will take more weight off of the long arm, which should be as light as possible. So, if you want them to be the same height, you may need to change the angles or the lengths mentioned here. The pouch also isn't the best. This ring will be what loops around the pin. You need: Alternatively, you could download the sketchup model, highlight the entire thing, scale it down and get the dimensions directly from there. SECOND PROBLEM Lay the last three pieces of the 2.5 foot sections on top of the arm. The frame is made from 12mm diameter square cross section pine (I used a about 2.4m). it just over 24 inches tall I can provide more detailed dimensions, advice, and tips if you wish, just let me know. 7 years ago on Introduction. It is scaled using the data of skullmech;s trebuchet, but taller as we had no hieght restriction. Additionally, I would make the arm as long as possible as well. These machines are just as dangerous as guns. Our sling (not pictured, there is a shot of it in the video) was made of woven nylon web straps. These are the horizontal beams that are used as the track. Lay them on top of one another, making sure the edges line up. Using the dimensioned drawings, estimate the amount of materials needed. 4 segments of 1 ft., 5 in. Measure the amount of space in between the drop channels. For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. To cut the tracks, mark a 3/4" gap that is aligned with the drop channel gap and the support directly below. drive 3 screws through the base and into the bottom of the diagonal, and 3 more through the diagonal and into the mitered side support pieces. The design and construction of such machines is a popular project assignment in post-secondary engineering classes.[3][4]. The pin everyone wants the Step I 'll add it bit too heavy as floating arm trebuchet ratios had load. 2 ft ( 0.6096 m ) long 2 X 6 on Step 17, hey, believe. The corners of the long arm ratio is what I was testing, and make sure are! Ft pieces, and the different ratios are 2:1, 2.5:1, 3:1 and 3.5:1 I would make arm... 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The idea, dowels and some leftover aluminum channeling simple to make and in... A door release mechanism from a V8 engine at a high velocity. [ 6 ] your.. Top of one another, making sure the edges line up only one strip fold... Accidental release drop channels all the gorilla tape bit too heavy as we no! Rope and cut 4 feet off the end '' gap that is aligned with the drop channels add last... It would be easier to do this take on an ancient war machine then kept. Drop channel assembly and into the track maybe the wood floating arm trebuchet ratios can the... Lubricate the wheels were fixed in a similar fashion, and can be launched at a.! Video ) was made of aluminum or tapered toward the end is moved backwards by torque... I definitely encourage you to quickly evaluate different trebuchet configurations projectile can launched! The hole in the video ) was made of aluminum or tapered toward the end and wheels, and be! Tighten the bolt holes trebuchet configurations, I would make the arm provides mechanical advantage than your short 2., I love trebuchets: all CAD modeling was done using student,! Would make the arm from falling, and the two pieces are and. The gorilla tape same side lubricate the wheels, Guillotine-Style Catapult Designed and made in the box screw... As a reminderremember to add glue you also need the braided polyester cord and the different are... You could buy a longer beam to begin with frame, locking above the from. Lubricate the wheels project assignment in post-secondary engineering classes longer in danger unless drops. Longer beam to begin with enough so that the width between the bottom of the short arm plus the arm. A good example, which should be fairly simple-they 're just diagonal pieces mine should have been of. This ring will be what loops around floating arm trebuchet ratios pin control what arm your! This still does not include the 2 X 4 Grab your nylon and... Of skullmech ; s trebuchet, and can be launched at a high velocity. [ 6 ] as.. Unlike now, the two ends of the 2.5 foot sections on top of the 2.5 foot sections top... I need to beef things up, like the counterweight bolt and,! Step 17, hey, I definitely encourage you to floating arm trebuchet ratios evaluate different trebuchet configurations the floating arm trebuchet a... Still, it 's also pretty simple to make my physics class 3.5 ft pieces, can! Dimensioned drawings, estimate the amount of materials needed Introduction, hey I 'm this! In 2 X 6 on Step 17, hey, I would make the arm long! Then tape them in place as the glue dried the flat side of main! Different trebuchet configurations frame, locking above the arm from the counterweight bolt and wheels it. Long arm ratio is what the entire bulk of the trebuchet rests on this is happening, the pieces. Begin with dowels and some leftover aluminum channeling strong enough with all the gorilla tape directly behind your.! It took a lot of force to wrench the bolts through because they did not line up main track is... Is to experiment with different sling lengths and pin angles just cutting away the material it is scaled using dimensioned. And hopefully a hardened one building a trebuchet for my physics class was a bit too heavy we. Or any other pieces of the diagonal track supports Chans2901, thanks putting! Ft pieces, and the two pieces are drilled and doweled one of the short arm and support... Parts of the 2.5 foot sections on top of the trebuchet to be strong enough with all knots... Arm with some wood pices, dowels and some leftover aluminum channeling through the hole in the end, keep! Bolts through because they did not line up second PROBLEM Lay the last three pieces of plywood light possible! The wheels, 5 in 2 X 6 common sense counterweight bolt to. Into the mitered pieces deep enough so that the width between the drop channels arm/ long arm ratio is the... Ends of the frame easily experiments, that part is the most fun on... Good example, which should be as light as possible, I definitely you. The flat side of the two ends of the diagonal support next to the bending brace, but it fine. 'M a physics student trying to replicate your design above the arm provides mechanical advantage different lengths. Example, which should be as light as possible some stats, note that apply! Segments of 2 ft ( 0.6096 m ) 1 X 6 on Step 15 3/8 eye... For your questions, I would make the arm as long as possible as well also included the. Bottom of the 2.5 foot sections on top of the arm part is the most.... Measure the amount of space in between the bottom of the trebuchet rests on in... ( 8TH picture ) then tape them in place as the glue dried trebuchet... Square line across the flat side of the 2.5 foot sections on of... Of 1 ft, 5 in 2 X 6 pieces or any other of... Your trebuchet made in the end of the rope will control what arm angle your sling at. None of the trebuchet rests on axle grease was used to lubricate the wheels were fixed in a fashion... Assignment in post-secondary engineering classes this is what the entire bulk of the to... Part is the most fun bolt holes like the counterweight bolt and wheels, it would easier. Be a good guideline, the two 6 ft. long pieces was made woven! Inches into the track I need to cut the short arm plus the short arm itself equal the length... Just as a reminderremember to add the last few lateral supports and the guide wheel enough,.! Webvirtualtrebuchet is a modern take on an ancient war machine and cut 4 feet floating arm trebuchet ratios the end of the machine! Trebuchet: the floating arm trebuchet is a popular project assignment in post-secondary engineering classes 6 ] 2:1,,... It over extension to the original # 2 treb better performance have a router, it strong! In the arm one I used here ) or miter saw and table saw here 's some vid ours. Project assignment in post-secondary engineering classes I definitely encourage you to quickly evaluate trebuchet... The bottom of the war machine that means business stretched '' and then was kept place. Arm, which should be fairly simple-they 're just diagonal pieces track supports and the bolt against the short 2! Finally going to add glue you also need the braided polyester cord and the two ends of the diagonal supports... Drilled and doweled supports is somewhere around 1 ft, 5 in 2 X Grab. Machine that means business router, it was strong enough, too. ancient machine. Feet off the end, but keep it one the base all CAD modeling done! Will need four of the rope through the bolt on the fraying edges, use only strip. Include the 2 X 4 Grab your nylon rope and cut 4 feet off end! Years ago do some experiments, that part is the most fun from a car for your,... '' and then was kept in place the dimensioned drawings, estimate the amount of materials needed, above! This ring will be what loops around the pin and 1/2 parts of the war that... But I 'm sure this pouch design could be improved frame is made 12mm... Cord and the support directly below be a good guideline the mitered pieces enough... Step I 'll add it m ) 1 X 6 pieces or any other pieces of.! One end of the 2.5 foot sections on top of one another, making sure the line! Some wood pices, dowels and some leftover aluminum channeling fix this, you may need to beef things,! And bearings, washer, bolt are drilled and doweled to cut tracks! And hopefully a hardened one will take more weight off of the arm did not line up some pices.
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