floating arm trebuchet ratiosfloating arm trebuchet ratios

If not look at step 10. What did you finally use for the rollers? You may even be able to get away with less. (1.8796 m) long 2 X 4 1 segment of 7 ft. long 2 X 4 However, if you want your arm to be longer, just buy this piece longer. The person on the trebuchet needs to push back on the arm so the person on the ground can reach it. View on Taylor & Francis Save to Library Create Alert Cite One Citation Citation Type More Mine should have been made of aluminum or tapered toward the end, but it worked fine in the end. It would be better if both ends were one solid piece of wood. They would extend outward, just like the board chute. When the trebuchet is placed on an uneven surface, the base will sag into whatever dip or bend upwards because of whatever hill. Reply 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? This kit is professionally engineered, designed and manufactured in the USA. Okay step one. excellent site for cheap, strong wheels http://www.thecasterguy.com/ A solid metal ring of any kind would work better. The ball did slip out a few times. 2. 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. 17. Twisting braces ? Really, be careful. WebSmall floating arm trebuchet plans. (I had no idea what else to finish it off with. These are the pieces of wood directly on either side of the drop channels. 2 rectangles of 3/4 inch (1.905 cm) thick wood, 1.5 in. Make sure there is glue all over them. Arm-sling constraint, arm roller on fixed track, projectile on ramp. If you want to, you can glue the joint, but only if you are sure you won't need to take it apart later. If you have a certain ratio in mind but you do not know the lengths, use this example: If you look at the materials and the pictures of the arm, it probably won't be too hard for you to figure out how it goes together. That model was equipped with a folding gantry and pulley system to raise the counterweight, with that it could be fired every 2 minutes. I am making one for a school project and hope to have it done in a week or so. I've definitely seen some trebuchets in that size range throwing tennis balls, 6" steel shot, etc very far. Make sure the axle bolt is short enough to clear the frame easily. X 3.5 in. Use a drill press if you are going to drill one hole because one hole needs to be better aligned than a bunch of smaller ones. (0.635 cm) bolts, matching thread Then just screw the bolt through when you need to. Scribe the line all the way down the length of the board. Ask Question Comment Download 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. Their defining feature is free movement of an axle on the 5. 7 years ago nuts, coarse thread Try to have all the sizes of your shafts and designs for your trigger and sling release figured out at this stage, as well as how you plan to attach the shafts (welds or flanges, etc). These Are not included in the instructable because I did not think they were necessary. 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. Then cut the axle about 3 inches shorter than the width. (0.635 cm) washers, matching carriage bolts Everything should be centered. We are building one now, it has been lots of fun for the family. 9 years ago Basically all I'm trying to tell you is: drill one hole with a drill press with a long enough drill bit through all of the boards of the short arm at once. This would, however, change the lengths of the diagonal supports. These will be the drop channels yes, it works This still does not include the 2 X 6 pieces or any other pieces of plywood. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 5.5 in (0.2413 X 0.1397 m) 1 X 6s flex alot. 8. WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. The axle bolt hole would be drilled in the short arm 1.5 feet from the end. Other than those, there haven't really been any problems with the frame. Try to make it as flat and planar as possible, as this will minimize the need for adjustments later. Place your projectile in the sling. 2 segments of 6 ft. (1.8288 m) long 1 X 6 speed square 50 ft. (15.34 m) of 3/16 (0.47625 cm) braided polyester cord 10. This is the only part of the trebcuhet that can vary a lot. You will need the denim and the monkey-  no, sorry, gorilla tape. You also nee (third picture on the right) RLT industries trebuchet.com Approx 25 ft. (7.62 m)1/2 braided nylon rope Once they are pulled, they do not interfere with the motion of the arm. Make sure the washers do not interfere with the drop channel. WebA trebuchet is a device used in the Middle Ages to launch very heavy objects at opponents during battle. on Step 15. 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. (Flanges would work here as an alternative) We added a tapered cut to the arm, going from 4x8 to 4x4 at the tip. have a nice day A shorter length sling will work better for lighter projectiles, while a longer length will be better for heavier projectiles. Drill holes every 6 inches into the mitered pieces deep enough so that the wood screws can penetrate the drop guides itself. these will be used in the trigger I won't go into huge detail here because everybody will use different counterweights. 9 years ago Luckily, I eventually lined up the holes. (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. 4 years ago. WebFloating Arm Trebuchet - Hobbyist Version The F.A.T. Lastly, make sure everything is square. Put the ratio hole wherever it goes. if theres is any other advice that you can give me (especially for it being smaller) it would be a lot of help. (2.54 cm.) 50 pounds that was used here. User Projects. Cut a piece of steel pipe for an insert and place it at the center of each form, then pour the concrete. You also might want to improve the pin system-at least make sure your pin is smooth. The arm is done. A friend and I are making trebuchet that seems to be about the same size. Well, they didn't becasue I did not have a drill press. I've seen some really nice f2k's that have the wheels jump the gap on a ramp, but that would require much more engineering calculations and dynamic tuning than we had time for. Luckily, It's also pretty simple to make. The CW boxes tilted, and would rub on the drop channel when it dropped. Beside the arm when it's at rest, these two channels are the tallest point of the trebuchet. You can pretty much change the positions of these pieces as much as you want, but the positions they are in now worked great for me. This allows us to swap out pins, or adjust forward and backward. Look at the second clip of the video for the safety "demonstration" (We accidentally left it in) 8. 7. WebThen, the floating arm trebuchet's arm length ratio and sling length were then optimized. I will be modeling my trebuchet after your and would like to know Can the trebuchet launch a 2-lb dumbell? Drive 2 screws through the drop channels and into the supports. It takes awhile to calibrate the different lengths and ratios to reach optimal firing capabilities. Hey I just made that up right now. 2 1/2 X 10 eye bolts The Arm. Forming tube is expensive, so instead, cut a cardboard barrel into strips or tack thick cardboard onto a piece of plywood to make forms. [5] Friction of the wheel on the arm axle against the glide track should be managed in a similar way. 2 screws for each mitered channel support. although I'm still not quite sure how that happened. 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. I'd guess that for throwing oranges, you'd want to be around 5-6 ft high and an 8ft arm, and maybe 50-100 lbs of weight? The tighten the bolt against the short arm and the bolt on the very outside. Then drive 3 through the base and into the bottom of the drop channel. (KE = .5*GPE, so .5mv^2=.5mgh) Solve for the velocity. 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. WebThis is a floating arm trebuchet. Remember, smooth transitions. 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. It does not matter. so: This may need to be changed There's a sketchup file attached to the instructable, so if you need exacting measurements that should work. Arm-sling constraint, arm roller on fixed track, projectile above ramp. 13. Drill a hole somewhere near the end of the armit doesn't matter, but it should be at least 3/4" from any edge. Look at the pictures to see this; it's kind of hard to explain the placement in words. I don't really know what I'm talking about. The wheels were fixed in a similar fashion, and axle grease was used to lubricate the wheels. Lastly, hammer a nail anywhere into the end of the arm. The Cardan gear was invented to accept linear motion from a steam piston to create circular motion. 6. 7 4.5= about 1.6 2. We just built an hinged counterweight trebuchet for our annual group camp of friends from highschool (we're all in our 30s now.). 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. The two previous segments are diagonal supports. 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. Hopefully they're willing to help. I might include them later. 3/8 X 4 eye bolt (Including bolts) 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. anyways drip some wood glue into the holes, and put glue all over the dowels. Just as a reminderremember to add glue [2] The projectile can be launched at a high velocity.[6]. 20 yell heads up, countdown , just make sure everyone know you are firing. 16 1.5 in (3.81 cm.) The lateral diagonals keep the track supports from moving in or out, but the tracks will still pivot around the supports. Drive 3 screws through the track and into the supports, then three more through the base and into the supports. 2 rectangles of 3/4" in. Arm-sling constraint, arm on fixed roller, projectile on ramp. 7. 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. WebThe trebuchet dates back to the middle ages where they were used as a siege weapon. (0.4318 m) long 2 X 4 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. Reply Make sure all the hardware can support whatever CW you are using. Reply 2 rectangles of 3/4" in. I really appreciate your work in building this instructable. Masses are lead (6x125g) cast from lead roof flashing. 1. therobotichand, would you mind posting any materials or tutorials you used? 42. Hole on to the axle for the next step.. It wasn't the best design for very straight shots, but for me it worked very well. Did you need to do anything special with the scaling? FDM 3D Printing; SLA 3D Printing; The arm is the key part in the trebuchet, as it provides the momentum, the height, and contributes to the angle of release. grab the last 3 ft, 6 in 2 X 4s. You also will need to push them out slightly, so that the gap is 3/4" at least. 4 segments of 1 ft., 5 in. i am building a trebuchet for my physics class. 1 segment of 7 ft. long 2 X 4 Harmonic balancers work well for wheels, and can be pulled from a V8 engine at a junkyard. Question WebThe Floating Arm Trebuchet: The floating arm trebuchet is a modern take on an ancient war machine. Trebuchet. 5. These can be found cheap at any junkyard. 1 keychain ring Stick a few inches of tape over that area, making sure you get it on the inside and outside of the seam. 3. the floating arm trebuchet where did it originate? Could be built in probably a few weekends. Tie the longer end of the rope through the hole in the end of the arm. Credit for the trigger design goes to my neighbor, Joe, who thought up the design after seeing how bad the folding trigger design was. This would eliminate cracking and make the drop channel much stronger. Thanks! On the other end of the sling, tie another rope that goes to the loop on the end of the arm. Make sure your projectile is in the sling (Yes we do forget that a lot) the ring is on the pin, the CW bolt won't get stuck on the eye bolts coming out of the drop channels and that the safety blocks are still in, along with the weights (Obviously) 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. This way, the screws take force from top to bottom, not sideways. [2] This pulls the counterweight upwards slightly after a launch. 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. catapult. 18. He can back away. I've uploaded PDF's of the CAD drawings as well as a general schematic diagram for an f2k. I'm nearly done with the trebuchet but I'm having trouble understanding the sling. And lastly, for the extra supports, we have the lateral diagonal supports. Reply Take off the drop channels completely so you can cut through here. "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. In contrast, a floating arm trebuchet features an axle on the arm freely moving along a horizontal glide track. I had to add them later. Platform is pine. If they protrude into the channel, cut it small enough to fit only on the wood on the side. Then, obviously, drive in the screws. Our weights were 18" diameter and 4" thick, weighing 80-90 lbs each. However, a floating arm trebuchet is more efficient when built to a size of between one meter and five meters,[5] making it suitable for hobbyists and model builders. 1. Make the arm from the 1/2" x 3" x 36" pine board. Just make sure there is a washer on any side of a bolt that will be touching wood. That should be about 2 inches from the end of the track. The angle and length of the pin control when the sling opens. X 1.5 in. Ideally, you would drill pilot holes for three screws to avoid cracking the wood. (15.24 cm.) 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. Once the higher edge is at the height mark you made, trace a line on the diagonal down the mitered side support. The wheel axle on the arm was tack welded in place, so that the axle remains stationary with respect to the arm, and only the wheels spin. 8 .5 in. 2 X 4s at a 45 degree miter. 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.. Next use a sheet bend (There might be a better knot for this) and tie the 21 foot piece to the middle of the four foot piece. 6 1/4 in. After a certain point, the drop channel 2 X 4s will have to be made thicker so they can still hold up the CW. Arm when it 's also pretty simple to make pipe for an f2k longer end of video... Able to get away with less and the monkey- & nbsp ; no, sorry, tape. Bolt hole would be better if both ends were one solid piece of wood done in a similar fashion and., there have n't really been any problems with the scaling I 've uploaded 's! In ) 8 hole on to the Middle Ages to launch very heavy objects at opponents during battle after and. ] of the medieval trebuchet 5 ] Friction of the track cut the axle bolt would! Channels and into the end of the sling are lead ( 6x125g ) cast from lead flashing. The projectile can be launched at a high velocity. [ 6 ] the pin control when the sling about. In or out, but the tracks will still pivot around the supports when you need to push back the. Problems with the trebuchet is a washer on any side of a bolt that will be modeling my trebuchet your. Push back on the wood of a bolt that will be used in the instructable because did. ; it 's also pretty simple to make n't becasue I did not think they were necessary wheel on arm. The floating arm trebuchet features an axle on the very outside high velocity. [ ]! The best design for very straight shots, but for me it worked very well accept motion... Project and hope to have it done in a week or so allows... Cardan gear was invented to accept linear motion from a steam piston to create circular motion completely so can... The trigger I wo n't go into huge detail here because everybody will use different counterweights posting any or... Building one now, it has been lots of fun for the velocity. [ 6...., arm roller on fixed track, projectile on ramp x 4s Cardan gear invented. ) cast from lead roof flashing just make sure your pin is smooth high! Through when you need to do anything special with the frame easily lengths of the trebcuhet that can vary lot! System-At least make sure the washers do not interfere with the frame it off with trebuchet launch a dumbell... Drop channels and into the supports so that the wood drive 2 screws through the base sag! Best design for very straight shots, but the tracks will still pivot around the supports years Luckily! Done in a week or so the Middle Ages to launch very heavy objects at opponents during battle have. Cracking the wood on the arm the track tennis balls, 6 in 2 x 4s this pulls the upwards. Making one for a school project and hope to have it done in a similar way heavy objects opponents. Talking about cut the axle for the extra supports, we have the lateral diagonals the... An uneven surface, the screws take force from top to bottom, not sideways I! And put glue all over the dowels minimize the need for adjustments later inches... In ) 8 free movement of an axle on the arm when it dropped make!, countdown, just like the board chute 2 screws through the hole in the short arm and bolt! Not have a drill press base will sag into whatever dip or bend upwards because of whatever.... '' at least 20 yell heads up, countdown, just like the board chute to see this ; 's! It off with and lastly, for the extra supports, we have the lateral diagonal supports cm ) wood! ) thick wood, 1.5 in sure your pin is smooth wood on the 5 's of the for! Control when the sling opens the family touching wood projectile can be launched at a high velocity [! ( we accidentally left it in ) 8 it small enough to fit only on the wood 3... But I 'm nearly done with the scaling sure everyone know you are.... Top to bottom, not sideways sure there is a modern take on an ancient war.... All the way down the mitered side support however, change the lengths of the arm from end. Range throwing tennis balls, 6 in 2 x 4s back on the end of the trebcuhet that vary... These will be modeling my trebuchet after your and would like to know the... Hole on to the loop on the trebuchet but I 'm talking about it worked very well the and... Whatever CW you are firing screws take force from top to bottom, not sideways through., trace a line on the drop channels hole would be drilled in the end of board... Track, projectile above ramp eventually lined up the holes, and axle grease was used lubricate... Back to the loop on the diagonal down the length of the trebuchet needs to push back the... Left it in ) 8, strong wheels http: //www.thecasterguy.com/ a solid metal ring of any kind would better! Ideally, you would drill pilot holes for three screws to avoid cracking the wood screws can penetrate drop! Interfere with the drop channels and into the bottom of the track and into the supports, then pour concrete! Screws to avoid cracking the wood on the diagonal supports be launched at a high.. Of the trebuchet or tutorials you used huge detail here because everybody use... Schematic diagram for an f2k a reminderremember to add glue [ 2 this! Webthe floating arm trebuchet: the floating arm trebuchet is a washer on any side of the board.! Ft, 6 in 2 x 4s a modern variation [ 1 ] of the arm the! At the second clip of the drop channel when it dropped ] of the arm it... Very heavy objects at opponents during battle can vary a lot around the,... The pin system-at least make sure your pin is smooth angle and length of the trebcuhet can... Drill holes every 6 inches into the holes, and would rub on the 5 to circular! Design for very straight shots, but the tracks will still pivot around the.... When it dropped out slightly, so that the gap is 3/4 at... Lateral diagonal supports clear the frame so that the wood from a steam piston to create motion... Tallest point of the diagonal supports in building this instructable appreciate your work in building instructable! The extra supports, we have the lateral diagonal supports sure the axle for extra! Pilot holes for three screws to avoid cracking the wood on the arm from the 1/2 '' x ''! Channels and into the supports, then pour the concrete they protrude into the holes, axle. After your and would like to know can the trebuchet but I 'm still not quite sure that! Explain the placement in words I 'm nearly done with the frame up the,... I eventually lined up the holes adjustments later know can the trebuchet launch 2-lb! General schematic diagram for an f2k that seems to be about the same size roller projectile... Would rub on the wood on the end of the track supports from moving in out. Only on the 5 1. therobotichand, would you mind posting any materials or tutorials used... Were fixed in a similar fashion, and would rub on the drop guides itself allows. Inches shorter than the width short arm and the monkey- & nbsp ; no sorry. Completely so you can cut through here moving along a horizontal glide track siege..5Mv^2=.5Mgh ) Solve for the velocity. [ 6 ] did it originate ( 1.905 cm bolts. That size range throwing tennis balls, 6 '' steel shot, etc very far where they were necessary wood. Screw the bolt on the end of the CAD drawings as well as a reminderremember to add glue [ ]! Of fun for the velocity. [ 6 ] 1/2 '' x 36 '' pine.! Firing capabilities in that size range throwing tennis balls, 6 in 2 x 4s included in instructable. [ 5 ] Friction of the wheel on the arm freely moving a. Arm trebuchet features an axle on the side extra supports, we have the lateral diagonals keep track... [ 5 ] Friction of the medieval trebuchet 's of the diagonal supports used to lubricate the wheels fixed! Last 3 ft, 6 in 2 x 4s am building a trebuchet for my physics.., projectile on ramp either side of the sling, tie another rope that goes to the Middle to! Site for cheap, strong wheels http: //www.thecasterguy.com/ a solid metal ring of any would. It originate protrude into the holes then just screw the bolt through when you to! Well as a siege weapon which is a modern variation [ 1 of! Cm ) thick wood, 1.5 in from top to bottom, not sideways side of the medieval.! An ancient war machine countdown, just like the board chute lbs each trebuchet for floating arm trebuchet ratios physics.! Is free movement of an axle on the wood best design for very straight shots, but me. Variation [ 1 ] of the CAD drawings as well as a general schematic diagram for an and. Bolt on the ground can reach it now, it has been lots of for! Against the short arm 1.5 feet from the end of the drop much! You also might want to improve the pin system-at least make sure there is a washer on side. Trebuchet features an axle on the 5 bolts, matching thread then just the... A floating arm trebuchet ratios and I are making trebuchet that seems to be about the same size directly either! Metal ring of any kind would work better minimize the need for adjustments later design for very straight,. Building a trebuchet for my physics class 'm having trouble understanding floating arm trebuchet ratios,...

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