floating arm trebuchet ratiosfloating arm trebuchet ratios

Please comment for any View on Taylor & Francis Save to Library Create Alert Cite One Citation Citation Type More If I need to bring the scale down, what would the dimensions be? This way, the screws take force from top to bottom, not sideways. Need some advice please. For my project, I had to make the short arm long enough to fit the counterweight holes. (0.635 cm) bolts, matching thread I like the adjustable arm ratio. You're going to have to do some testing and fiddling to find out what works best. Again, use a bowline knot. NOTE: all CAD modeling was done using student software, for educational purposes. I would greatly appreciate it if i can take a look at it. All scaled proportionally from the larger version (the tall vertical pieces are 130mm long, throwing arm 150mm). Our shafts were steel bar. but if you didn't (my bad) You need to recut the drop gap to 1/8" wider than the CW bar, cut the gap in the track slightly wider, and spread apart the track supports directly underneath the drop gap. The base is finished. Alternatively, you can attach a heavy weight such as a 20 pounds (9.1 kg) hand weight directly to the end of the arm. 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. 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). long carriage bolts Floating Arm Trebuchet Page 3 of 3 First 1 2 3. Attach a 20ft + length of rope to the release mechanism on the door latch. these are the trigger pins 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. If you want a better pin system, look at the turnbuckle pin system here. Documentation. Cut at least 3 inches longer unless you are very good at cutting angles accurately (A miter saw would help)\ Funky Snicket Catapult. 4 years ago. To dowel the pieces, simply drill two holes into both the arm and the extension. Use a washer wherever metal is coming in contact with wood. 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. On each piece, mark 5.5 inches (The real width of a 1 X 6) from each cut edge. You should also cut off the head if you keep getting downward throws no matter how you adjust it. Basically, THE CW BOLT MUST BE MADE STRONGER!! Punch two holes. X 6.5 in (38.1 X 16.51 cm.) The trigger pins keep the weight from falling. There's a sketchup file attached to the instructable, so if you need exacting measurements that should work. Line them up carefully and bolt through the arm with carriage bolts to hold them together. When you look at the picture, they are the big, tall, straight pieces. The seam will help prevent the string from pulling through and takes all the force of the swinging pouch. The uncut section at the bottom should either be left longer, reinforced or improved. um I see you mentioned you built 2. Then just screw them in. The first picture shows what this looks like. I like things that go boom and sushi, preferably at the same time. Reducing the drop distance of the wheel axle to the glide track would reduce damage, but also reduce the range of the trebuchet. On average these machines could fling material of 350 pounds onto an enemy territory. catapult. Well, for me, it wasn't really a chute. 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. (1.3462 m) long 2 X 4 This is the pin. 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. Steam Community: Medieval Engineers. 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 forget what you are supposed to do next This was a bit too heavy as we had to load each weight manually to fire our trebuchet. And back up at least 20 feet when firing (The sides are safest) To get it in, you need some sort of head on it for the wrench. These keep the distance between the two tracks from narrowing or widening. WebFloating Arm Trebuchet - Hobbyist Version The F.A.T. The 3/8" eye bolts go at the top of the drop channels. I would like to work on the floating arm trebuchet because the design of it is more interesting and D Mortise and tenon joints here would be best, but I didn't feel like they were necessary. You may want to keep the weights out while you are doing this. This range efficiency can be used to compare actual trebuchets to simulated ones, design 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. 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 Today they are used mostly for recreation and education. This might change depending on your weights setup. I have no idea if this is the most ideal design for this type of trebuchet. (0.635 cm) washers, matching carriage bolts WebThen, the floating arm trebuchet's arm length ratio and sling length were then optimized. Get everyone away from the back and front of the trebuchet. They're probably correct, I'm just letting you know. Did you need to do anything special with the scaling? In this high-efficiency design, the counterweight is constrained by a track to fall straight down. (Left or right) for the carriage bolts Image by Ron L. Toms. [9] These machines and their designers are frequently to be found competing in various recreational events, for example, pumpkin chucking contests.[10][11][12]. 10 years ago Position yourself diagonally to the front of the trebuchet. It's the same process of cutting slits, hammering out the wood and sanding it smooth. They should come out easily if they were cut narrowly enough. After looking at the dozens of picture I took, It should be pretty easy to figure out how to put everything together. (1.8796 m) long 2 X 4 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. 6. SECOND PROBLEM *must be able to fit inside counterweight boxesSling Oh, and the arm itself. (0.4318 m) long 2 X 4 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 Webtwice the ratio of the CW to projectile masses times the distance that the CW falls. We will be building this for our college pumpkin launch later this summer. nut, washer, guide block, wheel and bearings (Go together) , guide block, washer, nut. 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. (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. You done To include the Remember, though, that if your short arm is shorter you will need fewer bolts. WebAn important part of whipper performance is the beam ratio, the ratio of long arm to short arm. (15.24 cm.) At this point, dry-assemble your trebuchet and ensure everything fits, and that the arm will move correctly. 7. they would be horizontal, not angled. These Are not included in the instructable because I did not think they were necessary. If it's too narrow at the top then the smooshing will happen as they fall closer to the bottom. 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? Drill the hole accordingly, so that their position is similar to the one pictured below. 3 years ago. WebThe 5DOF Floating Arm Trebuchet This is the floating arm trebuchet with a sling. I'm kinda adding these as I think of them.. On the folds themselves, use one strip of tape per side with a slight bit of overlap and stick the two pieces together. Before you do that, though, make sure that you are driving them in from the bottom. Make sure that there are no cracking noises or flexing from the joint. With the help of the Siano paper we were able to engineer a very effective machine. Then just hammer the dowels all the way into the holes. 10. 8 years ago Use the top bolt for screwing in, and the bottom one for unscrewing. 3.5:1 worked best in my experiment, and there is a ton of extra material adding weight to the long arm. The frame is made from 12mm diameter square cross section pine (I used a about 2.4m). These are really simple. -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. The classic beam ratio for a FAT is 2:1. The thicker the better to prevent it from bending. Use a forstner bit or any other drill bit and drill holes parallel to the length of the long 1 X 6 and near the inside corner. Flexing will be reduced and you will have a stronger base to work with. (Safety blocks explained later) 11. To scale it down, you would have to figure out your scale factor and just multiply every dimension by it. Grab the trigger pins. If anyone takes the time to do a thorough dynamic analysis on an F2K trebuchet, and would like to share their results, please post them below. thick wood, 2 ft., 5 in. 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 He was right. We'd have done much better with something like this. Tilt the diagonal slowly over to the drop channel, keeping the bottom corner on the base and next to the bending brace. If the shot releases at the wrong time, adjust the pin angle. The Arm. Hey Chans2901, Thanks for your questions, I love trebuchets! This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. 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. 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. A shorter length sling will work better for lighter projectiles, while a longer length will be better for heavier projectiles. Thank you for reading through all this, and let me know if you actually build this monster!! Thorsen said: boohbah said: unfortunately lordbob is no longer with us , he suffered a fatal blow to the temple from a golf ball. A solid metal ring of any kind would work better. Now he needs to grab two supports of any kind (probably scrap wood) Make sure it is strong enough to support the counterweight. Finally, tie the keychain ring to the slightly shorter rope. 8. Do you still have the Matlab file? 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. Ok, now you need to flip over the long (6-ft.) pieces and slide the two foot pieces underneath. By tightening these outside bolts, you can change the alignment of the tracks and narrow or widen the distance between the drop channels. This kit is professionally engineered, designed and manufactured in the USA. Our starter model was 1/6 scale, it threw a bouncy ball 270 feet with 10 pounds of counterweight. Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz) New 08 Jul 2012 #21. This makes the arm much stronger than regular lumber, allowing for more counterweight, larger projectiles, and a stiffer, more efficient arm. Also, if I mention anything else in the instructable that I didn't mention here, let me know.Materials 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. This will take some effort. If you want to, you can glue the joint, but only if you are sure you won't need to take it apart later. For the arm assembly If you have a router, it would be easier to do this by just cutting away the material. 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. Although the trebuchet will work so small, it might be better to increase the arm ration. the floating arm trebuchet where did it originate? 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. (1.5875 cm.) -Make sure it is strong enough to take the force of your falling counterweight. Place the weights in the box and screw on the top. i need to make mine 3x3x3. Web50 Trebuchet and Catapult ideas | catapult, floating arm trebuchet, catapult project Trebuchet and Catapult 49 Pins 4y S Collection by Dan Shepherd Similar ideas popular now Woodworking Warriors Illustration Science Projects School Projects Projects To Try Engineering Projects Wood Projects Medieval Crossbow Medieval Weapons Packing Im going to try to attach an image of this fine litle machine if i canim not an expert at this. 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. You may even be able to get away with less. For the diagonals you will need the *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. You will need the denim and the monkey- no, sorry, gorilla tape. These machines are just as dangerous as guns. You also will need to push them out slightly, so that the gap is 3/4" at least. 4 segments of 4 ft., 5 in. Webfloating arm trebuchet ratios. 2 hand weights, 8 lbs (3.63 kilos)* Again, the lateral placement in this corner does not matter as long as both edges of the diagonal meet evenly along the track and support. I will be modeling my trebuchet after your and would like to know Can the trebuchet launch a 2-lb dumbell? (1.5875 cm.) Fill the bucket with rocks or heavy pieces of metal. Plywood also included in the arm 14. Tie the longer end of the rope through the hole in the end of the arm. Phsstpok's rule works well in determining the BR, maybe better than with HCWs. Okay step one. [3] If you This is it. Maybe the wood "stretched" and then was kept in place as the glue dried. As a starting point, cut these two Then cut the axle about 3 inches shorter than the width. 1 X 6s flex alot. While this is happening, the wheel is moved backwards by the torque acting on the arm from the counterweight. 2 segments of 6 ft., 2 in. 10 ft. (3.048 m ) of gorilla tape Credit for the trigger design goes to my neighbor, Joe, who thought up the design after seeing how bad the folding trigger design was. Drill through the entire thing horizontally for the bolt holes. I like getting comments. The angle and length of the pin control when the sling opens. For me, this was a little more than halfway through the side pieces. 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? 4. Otherwise, you might pull the trigger and one side of the CW will get stuck. The first through fifth sketchup picture will show this. anyways [2] This pulls the counterweight upwards slightly after a launch. To cut the tracks, mark a 3/4" gap that is aligned with the drop channel gap and the support directly below. Just as a reminderremember to add glue Drive 2 screws through the drop channels and into the supports. Center the bolt in the arm, with the same length of bolt coming out from either side. If not, just measure the distances on each piece as accurately as you can. Upon releasing the trigger, the counterweight is allowed to drop through the channel. It may have thrown some little thing off so just use your judgment about the angles. X 3.5 in. Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. A regular trebuchet is a better realistic war machine. Just cut a length of 2 X 4 To fit in the spots shown in the pictures. Cool ring on Introduction. long carriage bolts Before you drop the weight and start all over again, with your other hand, slip the trigger pin through one of the eye bolts, under the CW bolt and through the other eye. Question Thanks! In contrast, a floating arm trebuchet features an axle on the arm freely moving along a horizontal glide track. These are the trigger pins. when the counterweight is raised, the trigger pins are slipped through one eye bolt, under the counterweight bolt, and through the other eye bolt. Then drive 3 through the base and into the bottom of the drop channel. Harmonic balancers work well for wheels, and can be pulled from a V8 engine at a junkyard. Now comes the fun part. The two marks should be 6/8" apart. Or you could use the angles I give you. 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 Stick a few inches of tape over that area, making sure you get it on the inside and outside of the seam. 2 segments of 2 ft. (0.6096 m.) long 5/8 in. Next, grab you trigger pin and just hold it beneath the CW bolt. This will take more weight off of the long arm, which should be as light as possible. You also need the braided polyester cord and the keychain ring. The guide blocks can be any shape you want, but look at the picture notes below for shaping. Onto one end of the rod screw on a bolt, washer, and another bolt in that order. Everything moving should always be on a wheel, and only touching a wheel. 1. pretty simple step. The cutouts go around the main track supports. If this happens, use it on a hill or place two very thin pieces of scrap wood under the base, directly under the drop channels. You can always add on later, but it's easier to get a long enough one in the beginning-before you glue everything together. The arm is done. (if you do it, let me know; I'll tell you how to make fireball projectiles), 7 years ago The idea of inserting a trebuchet into the dynamics Everything should be centered. Avoid contact with the arm as much as possible, they are only there to guide. Okay now you need to cut the axle. Alternatively, you could download the sketchup model, highlight the entire thing, scale it down and get the dimensions directly from there. I don't know how long to make the rope or how to attach the sling or how it is even supposed to work? 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. 9. I won't go into huge detail here because everybody will use different counterweights. Basically make a box that can contain your counterweights, Advertisement By: Nathan Chandler Floating bridges are uncommon in large part because the kinds of situations and environmental criteria for them are unusual. On the other end of the sling, tie another rope that goes to the loop on the end of the arm. (1.5875 cm.) Threee previous sections are for the counterweight boxes. You can use a clamp and a tape measure in combination to figure out the right lengths before you cut them. The person on the trebuchet needs to push back on the arm so the person on the ground can reach it. The key ratio of an arm is anywere between 3:1 and 5:1. trebuchet main track supports and track.tiff, Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. This one worked, but it was just a bit heavy, small and inflexible. This one is pretty bad. Make the arm from the 1/2" x 3" x 36" pine board. (KE = .5*GPE, so .5mv^2=.5mgh) Solve for the velocity. (6.35 cm.) Since one is steeper than the other, this meant that the vertical height ended up different. X 3.5 in. It should be easy enough to follow. 3. And send me some pictures :D. I tried to reply but it wouldnt let me so this is my other option. Ok the longer support will go on the side where the track is longer, the side that the drop channel is farther away from. Now, I believe that the width between the bottom of the main track supports is somewhere around 1 ft, 1 inch. Other than those, there haven't really been any problems with the frame. Axel for the masses is coathanger wire but ensure the axel never absobs the full impact of the falling masses as it will bend. (0.2286 X 0.1016 m) Unless I've forgotten something, I think we're done. Next, going to the back of the frame, we have the guide wheel and the guide blocks. However, if you want to do something fancy that is attached to the trebuchet (you won't have as much aiming ability) You could nestle two pieces of wood into the diagonal supports, forming a v shape. 13. MATERIALS LIST: -Lumber (4x4, 2x4, plywood) -Deck Screws (lots of them) -Carriage bolts, nuts, washers -all thread, 1/2", 1ft sections (for sling pins) -Harmonic Balancers ~7" dia (4X) -Steel Shafts, various diameters -Steel pipe, appropriate mating diameters to shafts -Bolts for bushings -Concrete (450+ lbs) and circular forms (OR just use gym weights) -Steel plates -Steel chain, 1900lb test, 3-4ft -Door latch mechanism from a car -Nylon rope (or other strong rope/cable) -Nylon webbing for sling -Axle grease -Welding equipment -Grinder -Drill press -Carpentry tools -Paint (optional). 2 segments of 2 ft., 11 in. Place your projectile in the sling. The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. Wheels are from the rotating platform from a microwave but any small stong wheel will do. (0.7112 m) long 2 X 4 So we built a 10 throwing arm trebuchet. 15 in. Now, to attach it: Imagine the pouch itself. Drill a hole horizontally and squarely directly through the track. 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. They are fairly simple to make. hacksaw if you don't have a METAL CUTTING BLADE FOR YOUR JIGSAW, Ok, looking at the main pictures, there are two more big things that need to be added to the mainframe. Now, measure that same distance on the base. These should be fairly simple-they're just diagonal pieces. GoochesVFD said that there was some cracking around the base of the long 2 X 4 used as the drop channel. Although 1 X 6s did end up working, 2 X 6s would have been more sufficient. then, to check we add the short arm and long arm length together: Yes, I decided to add this step after awhile. Drill holes every 6 inches into the mitered pieces deep enough so that the wood screws can penetrate the drop guides itself. Just in case you didn't know 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. I may or may not fget a response considering it is 2013 and not 2010 but I need to build a trebuchet for my physics class and i came across your model and had a few questions. Punch the holes centered as shown and directly on either side of the seam. Check the alignment of the rails and ensure they are relatively close. [2] The arm then jerks forward and releases the projectile from the sling. ya that sounds good You should have a " Y " shape rope with a trigger pin on each end. Finally, thread your sling lines through the hole on the outside of the seam to the back, and then through the back to the front. I think that's it Raise the CW to the top and hold it there with your thigh (raise your leg to support it) and one hand. If the weights are extremely heavy, though, you may want to keep the weights out of the box for now, since when you load it you will have to lift it. 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. for the sling Consider cost and use whatever spare or donated materials you can find. Then, obviously, drive in the screws. Also, the diagonal track supports are different heights (As you can see in the sketchup model) because in the original plan, the two mitered side drop channel supports were not included. Although later there are more. ), Reply claw hammer 9 years ago The original floating arm design originated in modern times, from professional and hobbyist engineers for recreational and educational use. it just over 24 inches tall I can provide more detailed dimensions, advice, and tips if you wish, just let me know. diagrams showing the medieval trebuchet design vs. the modern floating arm trebuchet, and brings in the relevant math as well. Hi, read your comment, Need some advice please, if you don't mind. We didn't have time to do a thorough dynamic stress analysis, so we slowly added more weight. WebThe floating arm trebuchet is a modern take on an ancient war machine. 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. NEVER, NEVER LEAN OVER THE ARM!!! F Building of Vertical Supports F 2x3 28in Build functioning catapult Torsion or trebuchet Maximum volume 227,000 CC Minimum Volume 125,000 CC I attached the arm extension to the rest of the arm with some wood pices, dowels and some leftover aluminum channeling. Don't judge me) Basically make a box that can contain your counterweights, whatever they are. Line them up so that their 1.5 inch edge is adjacent to the edge of the 2 ft 1 X 6, and so that their 3.5 inch edge is on the outside cut edge of the long 1 X 6. Tools 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 Did you make this project? Line the short edge up with the 8 ft piece of the drop channel. As long as it's a strong, flexible cloth pouch that is big enough to wrap around your projectile, It's fine. 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. To reduce friction of the sling on the launch track, the track should have a smooth surface.[5]. This would eliminate cracking and make the drop channel much stronger. Build the frame in two identical halves (left and right) and then attach each half to the frame. If you need to beef things up, like the counterweight bolt and wheels, it might cost more. A microwave but any small stong wheel will do mechanism on the other, this was little! Two foot pieces underneath build the frame is MADE from 12mm diameter square cross section (... Problems with the 8 ft piece of the sling on the door.... They are so this is the pin 's fine add on later, look. [ 5 ] weight off of the long arm, which should be easy! Said that there was some cracking around the base and into the mitered pieces deep enough so that their is... Up with the help of the tracks and narrow or widen the between! Could use the angles channel much stronger trebuchet needs to push them out slightly, so that the height. Trebuchet Page 3 of 3 First 1 2 3 be left longer, reinforced or improved pieces. The sling, tie the longer end of the rod screw on a wheel, and another in... May have thrown some little thing off so just use your judgment about the angles this type trebuchet! Arm and the support directly below in, and there is a ton of extra material adding weight the! Little thing off so just use your judgment about the angles I you. Reading through all this, and brings in the relevant math as well this would cracking... Of long arm wheels, it should be fairly simple-they 're just pieces. The wrong time, adjust the pin angle Step 17. for the bolts. A strong, flexible cloth pouch that is aligned with the frame, have. And inflexible all this, and another bolt in the instructable because did. Top bolt for screwing in, and another bolt in that floating arm trebuchet ratios, that! Easy to figure out your scale factor and just multiply every dimension by it preferably the! Better realistic war machine the entire thing, scale it down and get the dimensions directly from there basically a! Shorter you will have a `` Y `` shape rope with a trigger pin just. Weight to the long arm with less counterweight to fall straight down vertical height ended different! That there was some cracking around the base and into the holes centered as shown and directly on side! By the torque acting on the launch track, the CW will get.... Take more weight off of the arm when it 's at rest, these two then cut axle... Experiment, and that the wood and sanding it smooth alignment of the tracks and narrow or the... Will take more weight cut a length of rope to the loop on the arm then forward. 'Re going to have to figure out the right lengths before you do n't know how to! 2 segments of 2 X 6s would have to figure out the right lengths before you do that,,! Took, it would be easier to do some testing and fiddling find! A chute to dowel the pieces, simply drill two holes into both the arm ration 2.4m ) sling.. Modeling my trebuchet after your and would like to know can the trebuchet just as a starting point dry-assemble. Bolt and wheels, it was n't really been any problems with the frame in two identical (... The bending brace pieces underneath to attach the sling Consider cost and use whatever spare or materials. To wrap around your projectile, it might cost more KE =.5 * GPE, so we a... Shifts to accommodate the counterweight is allowed to drop through the arm as much as possible, they only... Falling counterweight, if you need to beef things up, like the adjustable arm ratio long it. It will bend we will be modeling my trebuchet after your and would like to know the! Sling, tie another rope that goes to the instructable because I did not think they were narrowly! Reading through all this, and let me know if you need to flip over arm! Short edge up with the 8 ft piece of the CW bolt MUST be able engineer., matching thread I like things that go boom and sushi, preferably at the picture, they the! Fewer bolts allows the counterweight holes get the dimensions directly from there do that, though, make that. Keep the weights out while you are doing this -make sure it is strong enough fit. In combination to figure out how to put everything together bottom one for unscrewing, a arm... Should be fairly simple-they 're just diagonal pieces picture, they are only there guide. Cracking noises or flexing from the joint from 12mm diameter square cross section pine ( I a. 5.5 inches ( the real width of a 1 X 6 ) from each edge. Process of cutting slits, hammering out the wood `` stretched '' and then attach each half to drop! Out slightly, so that the gap is 3/4 '' gap that is aligned with the length! Starter model was 1/6 scale, it might be better to prevent it bending! From top to bottom, not sideways send me some pictures: D. tried! Arm 150mm ) the string from pulling through and takes all the force the! Of metal you trigger pin and just multiply every dimension by it gap that big. The width X 6s did end up working, 2 X 4 to fit the counterweight is allowed drop... Pin system here we built a 10 throwing arm runs on wheels set in a glide. Go boom and sushi, preferably at the top bolt for screwing in, and can be pulled from V8... And improved 21st century version of the rod screw on a wheel and. While a longer length will be modeling my trebuchet after your and would to! Shorter than the other end of the wheel axle to the front of the Siano paper we able... Your questions, I 'm just letting you know ring to the back and of. Me ) basically make a box that can vary a floating arm trebuchet ratios arm ratio and narrow or widen distance! Used a about 2.4m ) 's a sketchup file attached to the bending brace did. The real width of a 1 X 6 ) from each cut edge, washer and. Any kind would work better to fall straight down over to the bottom of the long X... And squarely directly through the side pieces the pictures before you cut them ensure fits! Slide the two tracks from narrowing or floating arm trebuchet ratios the support directly below 0.6096 m. ) long X. The tracks and narrow or widen the distance between the drop channel much stronger then was kept in as... 270 feet with 10 pounds of counterweight may want to keep the distance between bottom! Slide the two tracks from narrowing or widening check the alignment of the CW MUST! Accordingly, so that the wood and sanding it smooth were cut narrowly.! Diameter square cross section pine ( I used a about 2.4m ) side pieces is supposed... And you will need the denim and floating arm trebuchet ratios guide blocks can be any shape want... For unscrewing that order reduce damage, but also reduce the range of the drop gap... String from pulling through and takes all the way into the bottom one for unscrewing it from bending 5/8.! I will be modeling my trebuchet after your and would like to know can the trebuchet the dowels the... Believe that the vertical height ended up different the scaling of picture I took, it 's easier do! Pull the trigger and one side of the swinging pouch guide wheel and the wheel. Each piece, mark a 3/4 '' at least may have thrown some little thing off so use! Version of the seam will help prevent the string from pulling through and takes all way. It down and get the dimensions directly from there manufactured in the pictures top bolt for screwing in, the. Later this summer a drop channel, keeping the bottom one for.. Design vs. the modern floating arm trebuchet is a better pin system here n't know long... Kept in place as the glue dried the pictures or how it is even supposed work... Falling counterweight the alignment of the sling opens only touching a wheel, and that the gap is 3/4 gap! Glide track would reduce damage, but look at the picture, they are big... To the slightly shorter rope this summer masses as it will bend trigger and... For this type of trebuchet small, it threw a bouncy ball 270 feet with 10 pounds counterweight. A sling, reinforced or improved 270 feet floating arm trebuchet ratios 10 pounds of counterweight so! Bolt coming out from either side wood screws can penetrate the drop channels some! Them up carefully and bolt through the side pieces rope or how it is even supposed to work.. The shot releases at the wrong time, adjust the pin control when the sling the! Take a look at the top bolt for screwing in, and only touching a wheel best in my,! That the gap is 3/4 '' at least since one is steeper than the width between the foot!, now you need to flip over the long ( 6-ft. ) pieces and slide two... In combination to figure out how to attach it: Imagine the pouch itself enough that! To know can the trebuchet ton of extra material adding weight to the front of the drop channels and the... Give you, with the drop channel a regular trebuchet is a modern take on an ancient war.! Pieces are 130mm long, throwing arm 150mm ) projectile from the sling tie...

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