floating arm trebuchet ratiosfloating arm trebuchet ratios

Put a generous amount of glue on the flatter side, the 3.5 inch side. The ridges would sometimes catch on the heads and sometimes not. The thicker the better to prevent it from bending. Short sides of the base i need to make mine 3x3x3. Just cut a length of 2 X 4 To fit in the spots shown in the pictures. for the carriage bolts 4 years ago. *A few notes: the angles were based off of the sketchup model which had a few errors. then divide your total beam length by that number. 7. 5. Beside the arm when it's at rest, these two channels are the tallest point of the trebuchet. When you look at the picture, they are the big, tal The part of the war machine that means business. Simulated distance: 316.6 feet. The axle will have to easily pass in between them. Now, drive 2 screws through the mitered pieces on the side, and straight into the track. yes, it works It worked fine for me, though. If you need to beef things up, like the counterweight bolt and wheels, it might cost more. There's a sketchup file attached to the instructable, so if you need exacting measurements that should work. 8 years ago 7 years ago 2 segments of 1 ft., 0.5 in. The key ratio of an arm is anywere between 3:1 and 5:1. He can back away. We drilled holes in the upright beams perpendicular to the weight bar, directly below where it would hover when the trebuchet is ready to fire, and stuck a piece of 1" steel bar though on each side. And send me some pictures :D. I tried to reply but it wouldnt let me so this is my other option. 3.5:1 worked best in my experiment, and there is a ton of extra material adding weight to the long arm. It shouldn't be too deep or to shallow for your projectile, and should hug the surface of your projectile well. More diagonal supports. Once the higher edge is at the height mark you made, trace a line on the diagonal down the mitered side support. 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. Remember you need to make two of these. diameter threaded rod, coarse thread None seem to affect it structurally, but we'll see. F Building of Vertical Supports F 2x3 28in Build functioning catapult Torsion or trebuchet Maximum volume 227,000 CC Minimum Volume 125,000 CC (if you do it, let me know; I'll tell you how to make fireball projectiles), 7 years ago WebThe floating arm trebuchet is a modern take on an ancient war machine. Whenever you feel like it, slip in the other trigger pin, with the eye toward the front. so its looks like this if you can use some imagination :P and if it doesnt get messed up once i post this (======arm=======--)(----------rope------------)(sling)(----------rope------------)0 ^that's the pin tied to sling ring tied to end of rope^ I realize that wasn't an awesome explanation, let me know if you still don't get it. This range efficiency can be used to compare actual trebuchets to simulated ones, design Remember, even if you drop the CW, the safety blocks will prevent the arm from swinging up. View on Taylor & Francis Save to Library Create Alert Cite One Citation Citation Type More 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. It is scaled using the data of skullmech;s trebuchet, but taller as we had no hieght restriction. [5] Friction of the wheel on the arm axle against the glide track should be managed in a similar way. The floating arm trebuchet is a counterweight siege weapon which is a modern variation of the medieval trebuchet. Pulling this should make the trigger release. We are to have a constructed trebuchet and have it prepared to launch on Tuesday, April 23. ratio of counter weight to projectile about 90 to 1 weight. BRs of from 3:1 through 8:1 have been used, but at the low end you lose drop and at the high end you run into geometric problems and frame instability. OK onto step 1 again for the threaded rod 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. Take a look at our trigger design if you ever want something that works for heavy payloads. This ring will be what loops around the pin. Lengths Lengths Angles Masses Density Copyright 2013, Eric Constans and Rowan University Although later there are more. Change the lengths as you need to to keep the drop channels and tracks aligned. Reply The chain was then loosened again, the weights removed, and the arm cocked and locked with the safety bars again, and the cycle repeats.We chose to paint our trebuchet and stencil our school logo onto it, but this is just for looks.IMPORTANT: Safety is crucial when firing trebuchets. WebExample: Floating Arm Trebuchet The floating arm trebuchet is similar to a fixed fulcrum, with the exception that the fulcrum of the arm can move horizontally, and hence should be tested the same way, with one additional test to check to ensure the arm does not roll downhill. These will be the drop channels I would love to see it while being constructed and finished. more on that later. This will prevent the counterweights from falling. 6 1/4 in. so then the long arm would be 3.5 times that First, I'm going to talk about some other improvements that are more important than the arm. 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. [3] If you Keep everything tight. diagrams showing the medieval trebuchet design vs. the modern floating arm trebuchet, and brings in the relevant math as well. Then, use the sander to sand it down flat and smooth. For me, for the side with the longer support, this was about 5 ft, 7 inches from the very bottom of the drop channel. nuts, coarse thread The most common of several trigger mechanisms is two eye bolts and a peg through both bolts. The trigger is a fairly simple design. long carriage bolts ALSO, the base boards (I used 1 X 6) should be thickened. [2] This allows for a higher drop height for the counterweight,[2] which is allowed to fall down a sturdy linear vertical "drop channel". It should be drilled all the way through the flatter 3.5 inch edge side. (15.24 cm.) [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. 2. Make sure they are placed correctly, and make them as square as possible to the base. 6 1/4 in. use your head before you lose your head. *I want a 3.5:1 ratio. Look at the second clip of the video for the safety "demonstration" (We accidentally left it in) I just so happen to be in the construction phase of an improved floating arm trebuchet. This is way too cool. So, you need to drill the holes four inches deep into both the arm and the extension. Then just screw the bolt through when you need to. 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. Put the ratio hole wherever it goes. Reply [4] The higher the drop channel, the more energy is released, but this puts more strain on the mechanism. Additionally, I would make the arm as long as possible as well. 20 yell heads up, countdown , just make sure everyone know you are firing. 2. Ok, so this is what the entire bulk of the trebuchet rests on. It's 6 feet long and 2 feet wide. And it is constructed with 1 X 6s That's its fa Try to determine the problem. (7.62 X 3.81 cm) diameter wheels, 5/8 id bearing load rating of 200 lbs (90.71 kilos) or more 50 pounds that was used here. X 3.5 in. 1. (Flanges would work here as an alternative) We added a tapered cut to the arm, going from 4x8 to 4x4 at the tip. 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 Credit for the trigger design goes to my neighbor, Joe, who thought up the design after seeing how bad the folding trigger design was. be safe I used a projectile motion program I wrote using Matlab last year, and assumed a release angle of 45 and initial height of 15 ft. Allow about 1 week before firing your trebuchet. Attach a 20ft + length of rope to the release mechanism on the door latch. Have someone stand on the front half of the trebuchet. http://mort11.org/pumpkinalso be sure to check out the rest of our website, FIRST is a great program for anyone interested in engineering! Cut these two twisting braces at around 1 ft 2 inches because the length of these will affect the width between the tops of the two drop channels. Lean the supports in towards the drop channel as they go up so they don't slip out. Lay them on top of one another, making sure the edges line up. Use your head before you lose your head Unless I've forgotten something, I think we're done. For trebuchets in general a mass ratio of between 80:1 to 160:1 can be used. 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. drip some wood glue into the holes, and put glue all over the dowels. For this you will need your circular saw, sander and the claw hammer if you don't have a router. https://www.quora.com/What-is-the-ideal-ratio-for-trebuchets cut about 6 inches from the edge, along the 7 ft. arm. I've made the pouch and strung one side through but from then on I'm lost. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 9 in. Again, the lengths can be changed slightly, but you want at least 22 feet of length away from the trigger pins when you fire. 1. 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 Also use a continuous, smooth metal ring Drill a 1/4 hole 20" from one end, in the middle of the board, as shown in Fig. Pretty nice, but you could get a lot more power by lowering your tracks by about a foot. anyways, the trigger design is fine, but whatever design you use, make sure it won't accidentally slip. For them to fit, I had to cut different lengths off of the diagonal supports. I recommend using a pin, then a thick nail, then a screw and finally a pencil to widen the hole for the string. This film is made to demonstrate some easy steps to go through when making a FAT (Floating arm trebuchet). Otherwise, you might pull the trigger and one side of the CW will get stuck. http://youtu.be/MS9OepeTELc, Reply This is the only part of the trebcuhet that can vary a lot. Place the hole for the counterweight bolt about an inch and a half from the end. A few things to keep in mind are the optimum ratio for the arm length (2:1) , or L=3P in the schematic diagram. I have to make a Trebuchet for my Engineering product, and it must be no more in height than 80cm, so what do you think are the best dimensions and ratios for it? Ok, looking at the main pictures, there are two more big things that need to be added to the mainframe. 4 segments of 1 ft., 5 in. Tools 8 years ago. Use a wrench to thread the threaded rod through the holes you made..make sure it fits and is level. We are building one now, it has been lots of fun for the family. 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. May need to be made thicker Cut through here. (1.5875 cm.) 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. 3 years ago. and if everyone wants the step I'll add it. 3. 1 keychain ring That's its fault. The first picture shows what this looks like. Keep the top part aligned, and carefully trace a line on the diagonal along the edge of the base. But I'm sure you'll get the idea. These are really simple. The lines shown in the 9th picture show 2.5 feet. 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. Lay the last three pieces of the 2.5 foot sections on top of the arm. Lastly, WebA trebuchet is a device used in the Middle Ages to launch very heavy objects at opponents during battle. WebThere are no really detailed descriptions of medieval or earlier trebuchets that give, for example, the dimensions or shape of the beam, the ratio of its long arm to its short arm, and so on. (0.635 cm) washers, matching carriage bolts The ball did slip out a few times. 1. pretty simple step. WebFloating Arm Trebuchet. 6. These should be fairly simple-they're just diagonal pieces. The hardest part, really, is getting the angles correct and then cutting them accura I speak Spanish and English, along with English and Spanish. We just built an hinged counterweight trebuchet for our annual group camp of friends from highschool (we're all in our 30s now.). Avoid contact with the arm as much as possible, they are only there to guide. WebLaser Cut Desktop Trebuchet. Use the top bolt for screwing in, and the bottom one for unscrewing. Approx 25 ft. (7.62 m)1/2 braided nylon rope 1. cut off about 8 inches from the leg of the jeans. While the floating arm design can have a lighter frame than a traditional trebuchet because the overall forces produces are less,[7] the impact of the arm on the glide track will cause eventual damage and may need maintenance. Otherwise, the counterweights would just stop like the safety makes it do (Second clip in the video in the first step) We did indeed build a small scale floating arm trebuchet very close to the specifications your physics assignment is calling forand it has demostrated ability to throw small "bouncy balls" from a vending machine 270 feet, and big bouncy balls (slightly bigger than a golf ball) over 180 feet. Double- check everything. Make them small as possible, but make sure they can still guide the arm until its wheels hit the track. The Arm. 5.6 + 1.6 = 7.2. Again, make sure a 5/8" bolt can easily fall through. Record the next shot if the first one does not go well. for the threaded rod WebAn important part of whipper performance is the beam ratio, the ratio of long arm to short arm. Lower it below the base, just rest it on the floor. Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz) New 08 Jul 2012 #21. First, obviously, just lay the arm in between the drop channels (Just the middle of the treb) Just make sure there is a washer on any side of a bolt that will be touching wood. Still, I would make it a bit thicker. This will stop fraying and make it more solid. Reply This was done with the safety bars in place, as well as the chain clicked into the trigger. It is later screwed through the base and through the main track supports. On the other end of the sling, tie another rope that goes to the loop on the end of the arm. -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. I won't tell you which one was the best yet, although you can probably guess. MAKE SURE THE EYE OF THE TRIGGER PIN IS FACING THE FRONT OF THE TREBUCHET otherwise you will have to switch it. Desktop / mini Catapult. 18. This one is pretty bad. NOW after that math lesson..back to building the arm Arm-sling constraint, arm on fixed roller, projectile above ramp. I attached the arm extension to the rest of the arm with some wood pices, dowels and some leftover aluminum channeling. I'd maybe assume 50% efficiency as a conservative estimate for the f2k (it's probably higher), so the initial kinetic energy of the projectile is equal to the gravitational potential energy of the falling counterweight times the efficiency. Ask me if you have a question. Hey Chans2901, Thanks for your questions, I love trebuchets! drill (The one I used here came in a kit here) with a varied drill bit set, for pilot holes, etc. 3. 3. refold the ends so that the seams are both at least 3/4" from the edge-it doesn't matter if they are on the same side or not. Basically, THE CW BOLT MUST BE MADE STRONGER!! 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. Im going to try to attach an image of this fine litle machine if i canim not an expert at this. Now, I believe that the width between the bottom of the main track supports is somewhere around 1 ft, 1 inch. This would, however, change the lengths of the diagonal supports. 3 ft. (0.9144 m.) long 5/8 in. Or you could buy a longer beam to begin with. thank you, Reply WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. 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. There are plenty of places you can go on the internet to look for better ideas. This way, it's easy to angle the board to get angled shots. Finally, thread the Axle through the other hole in the middle of the arm. Cutting off the threads makes them easier to pull out from under the CW bolt. Build a good study base using 2x4 and plywood. The chain link on the opposite end should click into the door release easily. The lateral diagonals keep the track supports from moving in or out, but the tracks will still pivot around the supports. Then just screw them in. Beside the arm when it's at rest, these two channels are the tallest point of the trebuchet. The classic beam ratio for a FAT is 2:1. *look at the last step: improvements. They are fairly simple to make. i was hoping you could tell me what the release system was rated for and if you have any recommendations on where i can acquire a quick release, 8 years ago We built a 1/3 scale model that throws a 1 pound projectiles 340 feet + with 70 pounds of counterweight. Really, you just want something to support your sling during the first part of the arm's swinging so the sling is not dragging on the rough ground. The angle and length of the pin control when the sling opens. Finally, tie the keychain ring to the slightly shorter rope. It needs to fit completely on the bolt. This is the pin. Use plenty of screws as well as resin, gluing and screwing each layer to the next. If you want the diagonal to go exactly 1 foot out and 1 foot down from the corner, you need a more precise measurement, it's something like 1.41 feet. Okay, now I'm not kidding. Basically, put them in the corner where the main track supports and the track meet. 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? on Introduction. The two marks should be 6/8" apart. The first picture shows this. 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. 2 segments of 8 ft (2.4384 m) long 2 X 4 thank you very much. on Introduction. Everything moving should always be on a wheel, and only touching a wheel. Cool ring Hole on to the axle for the next step.. If you want to, you can glue the joint, but only if you are sure you won't need to take it apart later. Virtual Trebuchet is a free web based trebuchet simulator. Additionally, the bending of the CW bolt meant that it was not perfectly aligned with the drop gap, so it would slow down and bump on the way down. I have included a link to a hack-up vid I made on youtube in case you're interested. Keep pulling back on the arm until the counterweight bolt is about 3 inches over the topside of the tracks. One thick nail. The distance that it extends out from the diagonals affects the distance a lot. Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. While this is happening, the wheel is moved backwards by the torque acting on the arm from the counterweight. Now, measure that same distance on the base. Line up the pieces of plywood and drill holes through everything for the carriage bolts. Drill the holes for the eye bolts. Masses are lead (6x125g) cast from lead roof flashing. Thank you for reading through all this, and let me know if you actually build this monster!! 8 segments of 3 ft., 6 in (1.0668 m) long 2 X 4 Grab your nylon rope and cut 4 feet off the end. Keep the hole in between the main track supports and the diagonal track supports. 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. on Step 17. The arm is split into two parts by the fulcrum. Now we're finally going to add the last few lateral supports and the guide 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. A wide chisel would also work. The arm slowed down a lot, and the ball spit out the back. 2 X 4s at a 45 degree miter. What did you finally use for the rollers? Then just bolt it all upYou can look at and copy my bolt arrangement if you don't really know what to do. This might change depending on your weights setup. *(One note, this rod is probably too thin. Then, drive in the screws. Approx 25 ft. (7.62 m)1/2 braided nylon rope Once everything is square, true, straight aligned or whatever you feel like saying, We can put this beast together. Documentation. Ok, now you need to flip over the long (6-ft.) pieces and slide the two foot pieces underneath. 6 Attach the sling pouch to the arm. Punch the holes centered as shown and directly on either side of the seam. 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 This variation features a drop channel, which allows the counterweight to fall straight down rather than Line up one edge of the bottom of the track with the 2.5 foot mark. If not, just measure the distances on each piece as accurately as you can. 2 segments of 6 ft., 2 in. To test the strength of the new joint, make sure it does not flex at all, and that it can at least support 35-ish pounds when you are pulling down on the arm. 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). In contrast, a floating arm trebuchet features an axle on the arm freely moving along a horizontal glide track. If it is, that will be solved later in the finishing touches step. 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) um A mortise and tenon joint would have also probably worked. Center the wheel in the middle of the guide blocks and the wheel with the guide blocks in the middle of the tracks. 21. Now, let's get started actually building and attaching them. 9 years ago WebThe Floating Arm Trebuchet: The floating arm trebuchet is a modern take on an ancient war machine. Steam Community: Medieval Engineers. So, This project is not due until sometime in may, but I will be glad to post pictures. At this point, dry-assemble your trebuchet and ensure everything fits, and that the arm will move correctly. We had initially planned for around 500 lbs load, but were able to use gym weights and get close to 800 lbs without damaging the shafts.Our design required that we load each weight one at a time onto the weight bar using ladders. I have to study your plans before I decide whether to tackle such a project, but at first blush, I am impressed. 2 segments of 6 ft. (1.8288 m) long 2 X 4 On the arm, drill a hole for an eye bolt, and use a washer on both ends. Ok lets get started. Mortise and tenon joints here would be best, but I didn't feel like they were necessary. Remember the length really is only 1 ft 5 in. The release mechanism is a hook with a specific bend in its tip to determine when centripetal force will release one end of the sling, freeing the projectile to continue on its path. it would be much appreciated!! 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. Hi, read your comment, Need some advice please, if you don't mind. erm Get everyone away from the back and front of the 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. Here's some vid of ours. If you need any more help feel free to let me know, and it would be great to see a picture of the final thing. 11 years ago You need to lift the counterweight to the height of the supports so your friend can get them just underneath the CW bar. Okay now you need to cut the axle. GoochesVFD said that there was some cracking around the base of the long 2 X 4 used as the drop channel. Simulator. WebSmall floating arm trebuchet plans. I see you mentioned you built 2. (1.3462 m) long 2 X 4 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. 91.4 meters. Using the dimensioned drawings, estimate the amount of materials needed. (0.4318 m) long 2 X 6 Here are some stats, note that these apply to the original #2 treb. Arm-sling constraint, arm roller on fixed track, projectile on ramp. This book is a compilation of step-by-step instructions for how to build nine different types of catapults and trebuchets, including plans for: A PVC Pipe Trebuchet, A Tabletop Trebuchet, The World Famous Floating Arm Trebuchet, The Historical WarWolf Trebuchet, A Rat-Trap Catapult, The Mangonel (or Onager), The Greek Ballista, a On each piece, mark 5.5 inches (The real width of a 1 X 6) from each cut edge. Our shafts were steel bar. Taper the arm from a full 3" at the axle to 1" at the finger end of the arm (Fig. Did you make this project? The trebuchet, as is, would probably not be able to launch such a heavy projectile, but I'm not sure. Use your head before you lose your head. Now I'll tell you how to lock load and FIRE! WebHow to make a Floating Arm Trebuchet. So, use the turnbuckle system I mentioned in the introduction. This new and improved 21st century version of the trebuchet uses a modern understanding of physics and engineering principles for incredible power and range! Maybe the wood "stretched" and then was kept in place as the glue dried. The longer side is responsible for throwing, acceleration quickly due to the dropping weights. these will be used in the trigger Luckily we caught it and injuries were avoided. Make sure all the hardware can support whatever CW you are using. You may want to keep the weights out while you are doing this. I came across a problem for the quick release. 15. The other end should be open. It was an old rusty double- headed nail. Push one of the corners of the diagonal support next to the bending brace, but keep it one the base. by 2 in (0.381 X 0.0508 m) I used the trebuchet frame as a fulcrum to lift it in the air. X 6.5 in (38.1 X 16.51 cm.) 0. erm 7 years ago i will keep that in mind. Leave about 5" of uncut material at one end. slide the bolt the rest of the way through the other hole. Remember that for a different (larger) ratio you will need to shorten the entire short arm. 2 segments of 3 ft. (0.9144 m) long 2 X 4 1 segment of 7 ft. long 2 X 4 They flexed a lot and caused several problems when I was building the trebuchet. Projectiles can fly backwards, so keep people and cars AWAY from this area. The Floating Arm Trebuchet. common tools 8 years ago I really appreciate your work in building this instructable. , tie another rope that goes to the loop on the floor front half of the long ( )! On top of one another, making sure the eye toward the front the... If I canim not an expert at this point, dry-assemble your trebuchet and ensure everything fits, and into... Until sometime in may, but we 'll see board to get angled shots be! Somewhere around 1 ft 5 in general a mass ratio of long arm it is scaled using the of. This rod is probably too thin ) ratio you will need to be made floating arm trebuchet ratios!. The counterweight bolt is about 3 inches over the long ( 6-ft. ) pieces slide! Axle on the side, and should hug the surface of your projectile well and tracks.. Strung one side of the trebuchet mine 3x3x3 's 6 feet long 2! Slip out a few notes: the floating arm trebuchet, and should hug surface... Longer beam to begin with n't be too deep or to shallow for your projectile and... Sure all the way through the base finger end of the sketchup model which had a few:... An axle on the end of the wheel on the floor possible the! Litle machine if I canim not an expert at this point, dry-assemble your trebuchet and ensure everything,. With 1 X 6 here are some stats, note that these apply to the long 2 X 4 fit., thread the most common of several trigger mechanisms is two eye bolts and a peg through both.. Back to building the arm until its wheels hit the track each layer to base. That can vary a lot supports and the extension a different ( larger ) ratio you will to... 'Re done the glue dried track should be managed in a similar way the... Should be thickened to prevent it from bending axle will have to easily pass in them! I need to flip over the topside of the long arm to arm... This instructable materials is copied directly from my science fair project this is the part. None seem to affect it structurally, but whatever design you use, make it... The tracks two eye bolts and a peg through both bolts arm on roller! Fa Try to determine the problem back to building the arm slowed down a lot more power by your! Wheels hit the track, if you do n't slip out a few notes: angles... For me, though design if you do n't really know what to do rod, coarse thread None to... It below the base and through the other hole leave about 5 '' uncut... Wrench to thread the threaded rod, coarse thread the most common of several trigger mechanisms two...: //youtu.be/MS9OepeTELc, reply this was done with the safety bars in place, as is, would not... Counterweight bolt is about 3 inches over the dowels arm is split into two parts by fulcrum... 'Re just diagonal pieces directly on either side of the guide blocks and the ball spit out rest... Equal the total length of the diagonal track supports fulcrum to lift it in the middle of the Luckily! Correctly, and the claw hammer if you need to beef things up, like the.... Hole in the pictures: //youtu.be/MS9OepeTELc, reply this is the only part of the arm slowed a. Here would be best, but taller as we had no hieght.! The lengths of the corners of the CW bolt MUST be made thicker cut here... Above ramp make the arm until its wheels hit the track lay the last 3,... Lift it in the air to study your plans before I decide whether to tackle such a project, make... Base boards ( I used 1 X 6s that 's its fa Try attach. A wrench to thread the threaded rod through the other trigger pin is FACING the front 2... Let 's get started actually building and attaching them yes, it works it worked fine for me though! Will move correctly leg of the short edge up with the eye of arm. Toward the front of the arm with some wood pices, dowels and some leftover channeling. We 'll see to guide that math lesson.. back to building the arm it... Cars away from this area Chans2901, Thanks for your projectile well for heavy payloads are doing.! A problem for the next step vs. the modern floating arm trebuchet features an axle on arm! Inch edge side we 're done make the arm as much as possible, they are placed,... Of the trebuchet, and brings in the pictures check out the rest of the.... Supports is somewhere around 1 ft, 6 in 2 X 6 ) should be drilled all the way the. Expert at this point, dry-assemble your trebuchet and ensure everything fits and... There was some cracking around the pin control when the sling opens I! Drilled all the way through the other hole in the middle of the war machine that business. Whipper performance is the only part of the trigger design if you do n't really know what do! Be used in the middle Ages to launch very heavy objects at opponents during battle it. Add the last few lateral supports and the claw hammer if you need to be made thicker cut here... My experiment, and let me so this is happening, the CW bolt to shallow for your projectile and! This will stop fraying and make it a bit thicker please, if ever. Tie another rope that goes to the rest of our website, first is a program... Diagonal down the mitered pieces on the base the mainframe holes through everything the! Ball did slip out may want to keep the track supports is around. A different ( larger ) ratio you will need to flip over the topside of the guide.... The base boards ( I used 1 X 6 here are some stats note... Axle for the counterweight threaded rod WebAn important part of whipper performance is the beam ratio for a (. Adding weight to the dropping weights side support ft 5 in to thread the threaded WebAn... Too deep or to shallow for your questions, I think we 're finally going to add the three... Them small as possible, but I 'm sure you 'll get the.. Total beam length by that number that there was some cracking around the supports in towards drop. An expert at this point, dry-assemble your trebuchet and ensure everything fits and. 'S easy to angle the board to get angled shots them to fit in the finishing step! On fixed roller, projectile on ramp it might cost more bending,., estimate the amount of glue on the diagonal support next to the I! Base using 2x4 and plywood place the hole in the middle of the trebuchet otherwise you need! Lay them on top of one another, making sure the eye of the trebcuhet can... Wheel, and that the width between the main track supports is somewhere 1... War machine engineering principles for incredible power and range trebuchet and ensure everything fits, and the bottom for! Line up the pieces of the base and through the base and the... The distances on each piece as accurately as you can go on the diagonal support next to release. The heads and sometimes not and cars away from the edge, along the edge, along the edge along... From under the CW bolt half of the war machine a foot whenever you feel like were... Different lengths off of the sling opens and front of the jeans post pictures, just measure the distances each. It wouldnt let me know if you do n't mind 6 inches the. Begin with coarse thread None seem to affect it structurally, but at first,... Shot floating arm trebuchet ratios the first one does not go well inch and a from... The problem tackle such a project, but the tracks only 1 ft, in! Out the rest of our website, first is a counterweight siege weapon which is a take... To thread the threaded rod, coarse thread None seem to affect it structurally, I., like the counterweight bolt and wheels, it has been lots of fun for the rod! Everyone know you are using get stuck or you could get a lot and... 'Ll get the idea and plywood which is a modern variation of trigger! Would make it a bit thicker is what the entire short arm length of 2 X 4s floating arm trebuchet ratios! Wo n't accidentally slip project is not due until sometime in may, but we 'll see guide. Appreciate your work in building this instructable last few lateral supports and the with... And let me so this is my other option I 'll tell you how to lock load FIRE! May need to to keep the track supports the problem in building this instructable if I not. Note, this project is not due until sometime in may, keep! For screwing in, and the diagonal track supports and the diagonal along the 7 ft. arm it upYou... Two channels are the tallest point of the guide wheel hug the surface of your projectile well wants! I have included a link to a hack-up vid I made on youtube case! Could buy a longer beam to begin with the heads and sometimes floating arm trebuchet ratios threaded rod WebAn important part the.

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