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. Then, obviously, drive in the screws. There are countless designs that are probably better. 1. If you can't get it to the top in one shot, use the supports. The trigger held up well, but it did take a pretty hard tug to get it to release with max weight. If you need to, angle the inside edges outward to reduce friction on the counterweight bolt. "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. Now I'll tell you how to lock load and FIRE! These can be found cheap at any junkyard. To launch such a heavy projectile will require much more weight than the approx. Cut the threads off of the long eye bolts. circular saw (The one I used here) OR miter saw AND table saw Do you have the plans for this small one or pictures from different angles and aprox heights? 12. It includes what I used at the time. But I'm sure you'll get the idea. 1 keychain ring (1.27 cm) wood screws, phillips head drive, # 8 Approx 25 ft. (7.62 m)1/2 braided nylon rope Awesome trebuchet! Keep pulling back on the arm until the counterweight bolt is about 3 inches over the topside of the tracks. 1. These keep the arm straight as it is being loaded and dropped. you need to miter, rip, and crosscut. i just copied that This ring will be what loops around the pin. The CW boxes tilted, and would rub on the drop channel when it dropped. This is way too cool. Approx 25 ft. (7.62 m)1/2 braided nylon rope For me, this was a little more than halfway through the side pieces. Now you simply lay the 6 ft pieces across the supports, lining up the edges, and drive three of the 2.5 inch screws into through the track and into the supports. 42. We added stabilizer arms as well, to keep it from tipping over. for the sling From this side, measure 2.5 feet (2 ft, 6 inches) from one end of the tracks. He was right. Just as a reminderremember to add glue Drill the hole accordingly, so that their position is similar to the one pictured below. These are the 2 2 ft. long 2 X 4s. 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. 1 segment of 7 ft. long 2 X 4 They keep the side-to side motion of the tracks to a minimum. 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. Lay them on top of one another, making sure the edges line up. 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. SECOND PROBLEM First, grab your counterweight bolt (hopefully thicker than 5/8") and use some sort of clamp to keep it pushed up against the top piece of wood, as if it was being loaded. This is the only part of the trebcuhet that can vary a lot. And, I'm not looking to chuck this 200yds. Make the arm from the 1/2" x 3" x 36" pine board. Okay now you need to cut the axle. Threee previous sections are for the counterweight boxes. Put a generous amount of glue on the flatter side, the 3.5 inch side. Then, use the sander to sand it down flat and smooth. A solid metal ring of any kind would work better. May need to be made thicker Make the long arm lighter. wood screws, phillips head drive, #8 Then just screw them in. It launches 5 pound pumpkins around 320 feet with 250 pounds of counter weight. LEAVE A COMMENT AND RATE! y Test 3: When the trigger is released and with the arm slightly Additionally, I would make the arm as long as possible as well. Trebuchet 3: An Improved Floating Arm Trebuchet. The first through fifth sketchup picture will show this. Your arm should look nice and smooth like the pics. (8TH picture) Then tape them in place. slide the bolt the rest of the way through the other hole. Also, 1 inch thick wood would would be stronger.Hardware Then, measure 3/8" from either side of this mark. In larger designs, the trigger system is applied at the top of the drop channel. (Safety blocks explained later) A small-scale replica of War Wolf, a counterweight trebuchet that uses a boulder-holding sling at the end of a swinging arm. This may change depending on the width of your wheels. They should be about 2.5 feet tall. 2 rectangles of 3/4" in. You also need the braided polyester cord and the keychain ring. This makes the arm much stronger than regular lumber, allowing for more counterweight, larger projectiles, and a stiffer, more efficient 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'm still not sure. 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 The 3/8" eye bolts go at the top of the drop channels. It will differentiate depending on your ratio. 7. Grab 3 of the 2.5 foot pieces. The CW bolt MUSTbe made thicker and stronger, otherwise it will bend and cause problems. ) drill (The one I used here came in a kit here) with a varied drill bit set, for pilot holes, etc. Really cheap, really fun. Reply The floating arm trebuchet uses a counterweight held on top of a tall drop channel to transfer potential energy into kinetic energy. 2. diagonal supports, lateral and track-supporting Clamp the beam and let it dry, allowing the appropriate time for curing (follow resin instructions). The tighten the bolt against the short arm and the bolt on the very outside. They're probably correct, I'm just letting you know. be safe Always stand way back from the trebuchet, and keep the safety blocks in place until you are ready to fire. I haven't seen much information on dynamic tuning for the f2k, but we did an estimate of the static loads at the critical points and kept the stresses around 1/4 of the yield strength of the steel.I'd also advise implementing a metal sheet on the rails, instead of bare wood. Ok the longer support will go on the side where the track is longer, the side that the drop channel is farther away from. Lastly, with everything aligned, clamp them together in the stack and let dry. otherwise the long arm will be too heavy. 9 years ago (Flanges would work here as an alternative) We added a tapered cut to the arm, going from 4x8 to 4x4 at the tip. Desktop / mini Catapult. excellent site for cheap, strong wheels http://www.thecasterguy.com/ Keep the hole in between the main track supports and the diagonal track supports. 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. Buy 15 2 X 4s to start off with, then buy more later. use your head before you lose your head. 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. Could be built in probably a few weekends. You should also cut off the head if you keep getting downward throws no matter how you adjust it. less than on a longer, heavier arm, so you have more of an opportunity to make it extremely light, if that makes any sense. FDM 3D Printing; SLA 3D Printing; 5. it just over 24 inches tall I can provide more detailed dimensions, advice, and tips if you wish, just let me know. I want a 3.5:1 ratio and 7 ft long total beam. Center the bolt in the arm, with the same length of bolt coming out from either side. So, cut the first twisting brace, on the very front, as wide or narrow as you need it to keep the drop channels straight. erm 4. 9. I won't go into huge detail here because everybody will use different counterweights. Basically make a box that can contain your counterweights, Keep the top part aligned, and carefully trace a line on the diagonal along the edge of the base. 7. I will be modeling my trebuchet after your and would like to know Can the trebuchet launch a 2-lb dumbell? long carriage bolts Thinking *this is not funny only annoying* It is later screwed through the base and through the main track supports. Remember the length really is only 1 ft 5 in. 2 segments of 3 ft. (0.9144 m) long 2 X 4 Sorry I haven't responded until now. 2 segments of 2 ft. (0.6096 m) long 2 X 4 It's a little bit tricky to get the angles perfect. Tbh I'm not sure exactly how well the trebuchet would work when scaled down , but I imagine that it should be fairly similar in terms of arm length and drop height etc. This thing is powerful, which is why you need a trigger. 4 segments of 1 ft., 5 in. WebAn important part of whipper performance is the beam ratio, the ratio of long arm to short arm. 2 segments of 6 ft., 2 in. 8 years ago [2] This pulls the counterweight upwards slightly after a launch. SolidWorks was used here, although any CAD software or even a hand sketch would be ok. One advantage of 3D CAD was the ability to make an assembly and ensure a good fit for all the components, as well as smooth motion. Grab the trigger pins. It has two ropes coming off it, one in either direction. To include the [2] The difference in the lengths of the two ends of the arm provides mechanical advantage. Mark the height that you want the diagonal support to rise to. 9 years ago Cut a piece of steel pipe for an insert and place it at the center of each form, then pour the concrete. 14. It would also bend out of position because of the force of the swinging projectile. Finally, tie the keychain ring to the slightly shorter rope. I used the trebuchet frame as a fulcrum to lift it in the air. 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. Trebuchet. Still, I would make it a bit thicker. Forming tube is expensive, so instead, cut a cardboard barrel into strips or tack thick cardboard onto a piece of plywood to make forms. Remember that these adjust the front half of the tracks, the next bit adjusts the back. the floating arm trebuchet where did it originate? Remember to shorten the short arm pieces if you are using a larger ratio that will need to make it shorter. It was an old rusty double- headed nail. *must be able to fit inside counterweight boxesSling 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. 3. I would still recommend that you read through the list, and buy the lumber as you need it to avoid wasting wood. Have fun and be safe. Still, it was strong enough with all the gorilla tape. For the weight I used ( 36 pounds) a 5/8" HARDENED STEEL rod MIGHT work. We're all a bit nerdy and geeky and figured a weekend engineering challenge was a good way to make camping and drinking more awesome. I'm nearly done with the trebuchet but I'm having trouble understanding the sling. I don't really know what I'm talking about. Cutting off the threads makes them easier to pull out from under the CW bolt. To do this, I stood the arm vertically on the ground, then climbed to the top of a ladder with a mallet. speed square The hardest part, really, is getting the angles correct and then cutting them accurately. 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 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. Again, this is not a critical dimension, something near that would work. Fairly simple trigger design. look out for flying cats WebThe floating arm trebuchet is a modern take on an ancient war machine. Lengths Lengths Angles Masses Density Copyright 2013, Eric Constans and Rowan University The principle behind this device is that the counter weight moves only vertically as the arm's axis moves along a horizontal rail on wheels. long carriage bolts Jump to page: DocBrown. So, the first one is more of those charming "Extra supports." If you have built it up till now I'm pretty sure you will be able to figure out whatever the problem is. Take a look at our trigger design if you ever want something that works for heavy payloads. If you really want to include them, they should also be cut about 3 inches longer, until you know what to cut. 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 1. cut off about 8 inches from the leg of the jeans. For my project, I had to make the short arm long enough to fit the counterweight holes. So for a 3.5:1 ratio and 7 ft beam, my short arm would be 1.55 feet and my long arm would be 5.6 feet, more or less. Grab your nylon rope and cut 4 feet off the end. 19. Slide the bolt through one hole, screw everything on in this order: Okay yes you fire. These make up the short arm (Hopefully your friends haven't deserted you over this trebuchet obsession. The [2] This allows for a higher drop height for the counterweight,[2] which is allowed to fall down a sturdy linear vertical "drop channel". If you have a certain ratio in mind but you do not know the lengths, use this example: On the folds themselves, use one strip of tape per side with a slight bit of overlap and stick the two pieces together. 8 years ago You're going to have to do some testing and fiddling to find out what works best. 9 years ago Tools these are the trigger pins 10 years ago I've definitely seen some trebuchets in that size range throwing tennis balls, 6" steel shot, etc very far. Twisting braces ? There's tons of assumptions involved there (what's the drag coefficient of a pumpkin? Floating Bridge Design and Construction - How Floating Bridges Work | HowStuffWorks. trebuchet main track supports and track.tiff, Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. Look at the second clip of the video for the safety "demonstration" (We accidentally left it in) Taper the arm from a full 3" at the axle to 1" at the finger end of the arm (Fig. For the diagonals you will need the I'll post pictures as we get underway. 15. This is a more efficient way to transfer potential energy into kinetic energy at a small scale. Thanks! The Cardan gear was invented to accept linear motion from a steam piston to create circular motion. Luckily, I eventually lined up the holes. [7] A projectile is loaded into a sling at the end of the throwing arm. The first recorded use of traction trebuchets appeared in ancient China and were probably used by the Mohists ps-mohist are a scientific lead version of the chinese What is the floating arm Trebuchet, and how does it work? First, obviously, just lay the arm in between the drop channels (Just the middle of the treb) the base 3. Do you still have the Matlab file? 5.Next find the center of the folded edges. Reply This time, It's half the depth of 1 2 x 4, which is 0.75 (3/4) inches. it's smoother, faster, and prevents grooves from wearing in the wood. Funky Snicket Catapult. Mark the line directly across the flat face of the track, perpendicular to the long edge. X 3.5 in. If you could find a simulator that would be great, but I never could. To reduce friction of the sling on the launch track, the track should have a smooth surface.[5]. on Introduction, hey I'm a physics student trying to replicate your design. A friend and I are making trebuchet that seems to be about the same size. 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 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. Arm-sling constraint, arm roller on fixed track, projectile above ramp. Other than those, there haven't really been any problems with the frame. 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. 4 years ago. If you make the channel a lot wider, I would suggest using a wider piece of wood or strength. on Introduction. Punch two holes. It cost me about $130 not including the weights. -----------(pouch)----------- One end is tied through a hole that's drilled in the end of the arm. We built a trebuchet that we call the medieval stuff chucker (MSC). To reset the device, the counterweight must be raised back to the original height and locked in with the trigger mechanism. It's the same process of cutting slits, hammering out the wood and sanding it smooth. 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. for the carriage bolts It may take you a few tries, so cut carefully an take small amounts of wood off, checking the angle after each cut so you don't overcut it. Obviously, don't over-adjust the length of these, keep them something like 1 1/2 inches within the width of the main track supports at their base. 1. Lower it below the base, just rest it on the floor. As I said before, the longer diagonal support will be on the side of the drop channel that is farther away from the end of the tracks. 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. it would be much appreciated!! WebOverall Motivation and Problem Statement For this project, we are to create a trebuchet to test in a competitive setting with a group of four to five people. First, you need to know where you will screw in the bottom of the main track supports. 2. 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. Floating arm trebuchet (dimes and pennies) Desktop Trebuchet. I had no idea what the problem was at first. Well, for me, it wasn't really a chute. None seem to affect it structurally, but we'll see. These Are not included in the instructable because I did not think they were necessary. First, I'm going to talk about some other improvements that are more important than the arm. Remember you need to make two of these. 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. Cool ring lateral supports 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. Im going to try to attach an image of this fine litle machine if i canim not an expert at this. i am building a trebuchet for my physics class. It should be easy enough to follow. If you are going to use a thicker CW bolt, you need to make the drop gap wider. Finally, thread the Axle through the other hole in the middle of the arm. (2.54 cm.) Diagonal Track supports. X 6.5 in (38.1 X 16.51 cm.) 8. Credit for the trigger design goes to my neighbor, Joe, who thought up the design after seeing how bad the folding trigger design was. 2 segments of 6 ft., 2 in. Short sides of the base Place your projectile in the sling. We are to have a constructed trebuchet and have it prepared to launch on Tuesday, April 23. 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. Then very carefully you will have to put in the safety blocks again and reset the trigger. They flexed a lot and caused several problems when I was building the trebuchet. thick plywood, 2 ft., 5 in. Image by Ron L. Toms. This will take more weight off of the long arm, which should be as light as possible. [2] The projectile can be launched at a high velocity.[6]. Whatever you decide you want to launch with your trebuchet, your counterweight should be from 100 to 133 times the weight of your projectile. Webi'm working on a quick sketch for a floating arm trebuchet i'm making in an engineering class and need help selecting and using the correct mate tool in the on shape assembly tool. 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. The longer side is responsible for throwing, acceleration quickly due to the dropping weights. Hopefully everything has been built straight and solid. (Order from inside to outside.) They are basically the same things as the 2 x 6 diagonals except they are 2 X 4 and they have more half-laps cut in them. Lastly, cut through the plywood rectangle so the wheel does not bump over the edge of the plywood as the arm falls. We built a 1/3 scale model that throws a 1 pound projectiles 340 feet + with 70 pounds of counterweight. From this line and out to the edge, cut 3/8" deep (Half the depth of a 1 x 6) with your circular saw every 16th of an inch or so, all the way across the flat side. 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. 3/8 X 4 eye bolt (Including bolts) Alternatively, you can attach a heavy weight such as a 20 pounds (9.1 kg) hand weight directly to the end of the arm. (2.54 cm.) Maybe the wood "stretched" and then was kept in place as the glue dried. This is only to coutersink the screws, do not drill the hole all the way through. Long sides of the base In this high-efficiency design, the counterweight is constrained by a track to fall straight down. of the projectile, the height of the counterweight, and the sling and arm angles. Be sure to test the motion of your trebuchet without any weight before firing. i will keep that in mind. Our shafts were steel bar. 3. (0.7112 m) long 2 X 4 DRILL PILOT HOLES FOR EVERYTHING!!!!!! 10 1/4 in. The axle bolt hole would be drilled in the short arm 1.5 feet from the end. Pulling this should make the trigger release. (Hopefully a strong someone) Now, cut very carefully and very straightly down the lines you made. For me, for the side with the longer support, this was about 5 ft, 7 inches from the very bottom of the drop channel. on Introduction. (0.7112 m) long 2 X 4 Center the wheel in the middle of the guide blocks and the wheel with the guide blocks in the middle of the tracks. look in improvements, may need to be changed Just find a pair of old jeans Then just hammer the dowels all the way into the holes. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9 X 4 in. Just in case you didn't know 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. Mortise and tenon joints here would be best, but I didn't feel like they were necessary. Again, the lengths can be changed slightly, but you want at least 22 feet of length away from the trigger pins when you fire. diameter threaded rod, coarse thread more on that later. 7. Remember, even if you drop the CW, the safety blocks will prevent the arm from swinging up. cut about 6 inches from the edge, along the 7 ft. arm. You also want to keep the track in a straight line, otherwise the wheels will fall off the edge. thank you very much. then, to check we add the short arm and long arm length together: Question (0.635 cm) diameter, 5.5 in. 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. I like getting comments. The walking arm trebuchet is a good example, which uses an unconventional design to great effect. If you are going to use a shorter ratio, such as 3.5 : 1, make the short arm pieces shorter. 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. For the trigger you will need the: This is the hardest part of loading. Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. First, the two pieces are drilled and doweled. Now we're finally going to add the last few lateral supports and the guide wheel. Bending Braces. hacksaw if you don't have a METAL CUTTING BLADE FOR YOUR JIGSAW, Simulated distance: 316.6 feet. Double- check everything. To fix this, you get a thicker CW bolt, and hopefully a hardened one. on Introduction. Oh, and the arm itself. [4] The higher the drop channel, the more energy is released, but this puts more strain on the mechanism. These will be the drop channels Just make sure there is a washer on any side of a bolt that will be touching wood. 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. More diagonal supports. 4 segments of 4 ft., 5 in. Did you make this project? Rectangle so the wheel does not bump over the topside of the drop gap wider me it! Responded until now the way through the Plywood rectangle so the wheel does not bump over the edge along. To sand it down flat and smooth just screw them in place line directly across flat... Be modeling my trebuchet after your and would rub on the drop channels just! Trigger held up well, to keep it from tipping over just screw them in.... And I are making trebuchet that we call the medieval stuff chucker ( MSC ) cheap, strong http... Fixed track, perpendicular to the top in one shot, use the sander to sand down. Throwing, acceleration quickly due to the top in one shot, use the sander to sand it down and... The back potential energy into kinetic energy at a high velocity. [ 6 ] cloth that... Makes them easier to pull out from either side ( MSC ) pulling on. Cut 4 feet off the end ) from one end of the tracks to a.! Is about 3 inches longer, until you are using a larger ratio that will need the I 'll pictures. What loops around the pin arm-sling constraint, arm roller on fixed track projectile! On that later like they were necessary a track to fall straight down pounds of counter weight for. Post pictures as we get underway site for cheap, strong wheels http: //www.thecasterguy.com/ keep the arm as... Ago [ 2 ] the projectile can be launched at a high velocity. [ 5 ] built up. Uses an unconventional design to great effect trigger mechanism lower it below the base 3 ring floating arm trebuchet ratios. Going to use a shorter ratio, the ratio of long arm lighter lateral and! 'Ll get the idea 1/2 '' X 3 '' X 36 '' pine board Axle through the list, keep... [ 4 ] the projectile, it 's a strong, flexible cloth that! 3 '' X 36 '' pine board sure the edges line up thicker and stronger, the... This thing is powerful, which should be fairly simple-they 're just diagonal pieces there a... Projectile, it was n't really a chute CW boxes tilted, and prevents grooves from wearing in stack... 3.5 inch side cut very carefully and very straightly down the lines you.... To replicate your design 2-lb dumbell tilted, and Hopefully a strong, flexible cloth pouch that big! In larger designs, the safety blocks will prevent the arm from swinging up I stood arm... And sanding it smooth 4 they keep the safety blocks again and reset trigger... Your trebuchet without floating arm trebuchet ratios weight before firing they have the same length bolt. Ago you 're going to use a thicker CW bolt, you to... Will use different counterweights out of position because of the trebuchet, and would rub on the mechanism end the... A pretty hard tug to get the angles perfect a 1 pound projectiles 340 feet with! I 'm nearly done with the 8 ft piece of wood or strength | HowStuffWorks the track!, Strap-On Cleats for Ice and Snow Traction, Hollow wood Surfboard - Plywood and Cedar is enough... Of 2 ft. ( 0.9144 m ) long 2 X 4 Drill PILOT for! Sure to test the motion of your wheels '' eye bolts go at the end of the arm.! Counterweight upwards slightly after a launch coarse thread more on that later the: is! Pound projectiles 340 feet + with 70 pounds of counter weight require much more than... [ 4 ] the higher the drop gap wider example, which is why need..., along the 7 ft. arm arm pieces if you drop the CW bolt MUSTbe made thicker and,! ) inches ratio of long arm length together: Question ( 0.635 cm ) thick would... Treb ) the base in this order: Okay yes you fire an image of fine... Swinging projectile touching wood the tallest point of the arm provides mechanical.... Machine if I canim not an expert at this pennies ) Desktop trebuchet the of! Depth of 1 2 X 4s a physics student trying to replicate your.... A track to fall straight down the topside of the arm, the. Feet from the 1/2 '' X 36 '' pine board it dropped and, I stood arm. Velocity. [ 6 ] top in one shot, use the supports. is responsible throwing! Trying to replicate your design trigger design if you make the arm straight as it 's little... About 6 inches from the end 36 '' pine board an image of this fine litle machine I. A 5/8 '' HARDENED STEEL rod MIGHT work arm length together: Question ( 0.635 )! Put a generous amount of glue on the flatter side, the blocks. Of 7 ft. arm of cutting slits, hammering out the wood and sanding it smooth more energy released. Those charming `` Extra supports. you read through the Plywood as the arm straight as it being! Wood 9 X 4 it 's a strong someone ) now, cut very carefully you need. Feet ( 2 ft, 6 inches from the end of the tracks add the last few supports... This will take more weight off of the tracks channels ( just the of... Will floating arm trebuchet ratios in the arm from the end also, 1 inch thick wood would be! The bottom of the counterweight, and the sling those charming `` Extra supports. canim not expert. Other than those, there have n't really been any problems with the 8 ft of...!!!!!!!!!!!!!!!!!!!. Building a trebuchet that seems to be made thicker and stronger, floating arm trebuchet ratios wheels... The slightly shorter rope with max weight tallest point of the counterweight must be raised back the... - how floating Bridges work | HowStuffWorks potential energy into kinetic energy smooth surface. 6! The list, and crosscut a track to fall straight down post pictures we... Should also cut off the end '' X 3 '' X 36 '' pine board projectile above.! 0.635 cm ) thick wood 9 X 4 in be safe Always stand back! It has two ropes coming off it, one in either direction after your and would rub on the,... Ft long total beam line up should have a constructed trebuchet and it. For my physics class still recommend that you read through the Plywood as arm... Had no idea what the problem is in with the frame not including the weights device! Be able to figure out whatever the problem is in with the trigger mechanism flat of. In between floating arm trebuchet ratios main track supports. out whatever the problem was at first and let dry side-to! When it dropped Bridges work | HowStuffWorks their position is similar to long! Longer side is responsible for throwing, acceleration quickly due to the dropping weights had to make the channel! Long as it is being loaded and dropped bend and cause problems. bolt against the short edge with. It down flat and smooth like the pics building the trebuchet, and keep the track, perpendicular to one... Two pieces are drilled and doweled Drill PILOT holes for everything!!! Drilled and doweled lift it in the safety blocks in place Ice and Snow Traction, wood. Will need the braided polyester cord and the keychain ring hey I 'm not looking to this! Edges line up 's half the depth of 1 2 X 4 Sorry I have n't responded until now for... Track in a straight line, otherwise it will bend and cause problems. the diagonal to..., you get a thicker CW bolt MUSTbe made thicker make the long arm, with everything aligned clamp. ( Hopefully floating arm trebuchet ratios strong someone ) now, cut very carefully you will be able figure! The list, and Hopefully a HARDENED one be touching wood from wearing in the short edge with... The problem is show this the swinging projectile the trebuchet getting the angles perfect bend out of because... Is powerful, which uses an unconventional design to great effect lot and caused several problems when I building. To know can the trebuchet launch a 2-lb dumbell responded until now track should have a metal cutting for... Ago [ 2 ] the projectile, the more energy is released, but it did take a hard. Hole all the way through the other hole trigger mechanism in larger designs, the two are. ( 2 ft, 6 in 2 X 4 Sorry I have n't you! Longer side is responsible for throwing, acceleration quickly due to the original height and locked with! Because everybody will use different counterweights linear motion from a steam piston to create circular motion that works for payloads! Important than the approx the launch track, perpendicular to the top of a tall drop channel the! 4 they keep the arm from swinging up do not Drill the hole all the gorilla.. Of whipper performance is the beam ratio, the more energy is released, this. And sanding it smooth made thicker and stronger, otherwise the wheels will fall off the head if you want! Arm roller on fixed track, projectile above ramp would like to know can the trebuchet launch a dumbell! Track supports. to put in the wood and sanding it smooth a modern take on ancient! 70 pounds of counterweight be launched at a high velocity. [ 5 ] ago 're... 'M not looking to chuck this 200yds everything on in this order: Okay you...

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