The straight track drop is an idea used in a FAT (Floating Arm Trebuchet), or in our Baby ASOK (Arm Slides Over Cam). (1.5875 cm.) WebVirtualTrebuchet is a web based trebuchet simulator that will allow you to quickly evaluate different trebuchet configurations. Hole on to the axle for the next step.. I'm still not sure. For the arm assembly Push them up against the drop channel. Mine should have been made of aluminum or tapered toward the end, but it worked fine in the end. Our starter model was 1/6 scale, it threw a bouncy ball 270 feet with 10 pounds of counterweight. There's a sketchup file attached to the instructable, so if you need exacting measurements that should work. 6. cut about 6 inches from the edge, along the 7 ft. arm. To do this, I stood the arm vertically on the ground, then climbed to the top of a ladder with a mallet. And send me some pictures :D. I tried to reply but it wouldnt let me so this is my other option. The base is finished. 2 segments of 2 ft. (0.6096 m) long 2 X 4 This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. Put the ratio hole wherever it goes. There should be two layers at the outside and 1 layer inside, in the middle. It's a little bit tricky to get the angles perfect. Remember that these adjust the front half of the tracks, the next bit adjusts the back. Reducing the drop distance of the wheel axle to the glide track would reduce damage, but also reduce the range of the trebuchet. on Introduction. (1.8796 m) long 2 X 4 Ok, now you need to flip over the long (6-ft.) pieces and slide the two foot pieces underneath. Just in case you didn't know I know the rod is 5/8", but this will minimize any friction in case the channels were cut slightly curved. The person holding the arm up can relax. If you need to, angle the inside edges outward to reduce friction on the counterweight bolt. so, the placement doesnt have to be exact, but the numbers help if you can follow that. I attached the arm extension to the rest of the arm with some wood pices, dowels and some leftover aluminum channeling. Since one is steeper than the other, this meant that the vertical height ended up different. The chain link on the opposite end should click into the door release easily. Make sure they are placed correctly, and make them as square as possible to the base. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 9 in. when the counterweight is raised, the trigger pins are slipped through one eye bolt, under the counterweight bolt, and through the other eye bolt. y Test 3: When the trigger is released and with the arm slightly I won't tell you which one was the best yet, although you can probably guess. Thanks for writing this 'ible. WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. 3 segments of 3 ft (0.9144 m) long 2 X 6 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. WebStep 2: Prepare the Arm. FDM 3D Printing; SLA 3D Printing; This would, however, change the lengths of the diagonal supports. This might change depending on your weights setup. The design and construction of such machines is a popular project assignment in post-secondary engineering classes. If the shot releases at the wrong time, adjust the pin angle. Then, measure 3/8" from either side of this mark. Tighten the bolt as much as you can. Thorsen said: boohbah said: unfortunately lordbob is no longer with us , he suffered a fatal blow to the temple from a golf ball. 4 years ago. Does anyone have a solid works file for this trebuchet? I see you mentioned you built 2. Credit for the trigger design goes to my neighbor, Joe, who thought up the design after seeing how bad the folding trigger design was. WebThe floating arm trebuchet is a modern take on an ancient war machine. The arm extension is added onto the rest of the arm with three different methods. Position yourself diagonally to the front of the trebuchet. Trebuchet. 1 keychain ring You should also cut off the head if you keep getting downward throws no matter how you adjust it. Center it; make sure the same length of bolt is protruding from either side. Although later there are more. At the tip of the arm, we welded a steel box around it to hold the pin for the sling release and a loop to tie the other end of the sling rope to. 9 years ago This list of materials is copied directly from my science fair project. Then, drive in the screws. 91.4 meters. First of all you need two people The ridges would sometimes catch on the heads and sometimes not. (0.2286 X 0.1016 m) We think that the downward throws were caused by these two heads. I'm kinda adding these as I think of them.. Make sure the washers do not interfere with the drop channel. This way, the screws take force from top to bottom, not sideways. And, I'm not looking to chuck this 200yds. It has two ropes coming off it, one in either direction. on Step 15. -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. 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) I don't remember the exact dimensions, but I think it was a little bit taller than 8 feet, and about 6 feet long. 2. 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. Steam Community: Medieval Engineers. Maybe the wood "stretched" and then was kept in place as the glue dried. LEAVE A COMMENT AND RATE! These are the trigger pins. Have a nice day Before we start, there were a few problems. The Arm. Cut a piece of steel pipe for an insert and place it at the center of each form, then pour the concrete. (See 4th photo, near top of the trebuchet, steel bars hanging out)For the trigger: Cut a stepped, square slot out of a piece of lumber, as shown in the first photo, and screw your mechanism into the wood. The pouch also isn't the best. Lastly, hammer a nail anywhere into the end of the arm. To cut the half- lap, refer to step 1. The trebuchet, as is, would probably not be able to launch such a heavy projectile, but I'm not sure. 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? Next, grab you trigger pin and just hold it beneath the CW bolt. As far as we know, its the largest floating arm ever built by youths, and the largest wooden floating arm trebuchet in existance.The arm is 18 feet long, we use a 1.5 inch steel bar, and can load it up to about 800 pounds. claw hammer 1 segment of 7 ft. long 2 X 4 However, if you want your arm to be longer, just buy this piece longer. slide the bolt the rest of the way through the other hole. .and several of the bolts for the 5/8" threaded rod. there are small cracks throughout the trebuchet now because I was lazy. So, cut the first twisting brace, on the very front, as wide or narrow as you need it to keep the drop channels straight. So, use the turnbuckle system I mentioned in the introduction. Still, it was strong enough with all the gorilla tape. Mess around you'll figure it out. 7 years ago. They should be the same length apart as the width of the sling and its projectile. Arm-sling constraint, arm roller on fixed track, projectile on ramp. 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. (0.635 cm) washers, matching carriage bolts Now, drive 2 screws through the mitered pieces on the side, and straight into the track. Thats a bit longer than 7 feet because i rounded 7 4.5 up, it was really 1.55555555 (1.5875 cm.) 10 1/4 in. COMMENT RATE Use the top bolt for screwing in, and the bottom one for unscrewing. Grab the trigger pins. 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. Floating Arm Trebuchet Page 3 of 3 First 1 2 3. It wasn't the best design for very straight shots, but for me it worked very well. 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. it would be much appreciated!! 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. Width was around 2 feet, I think. Now I'll tell you how to lock load and FIRE! The 5/8" CW bolt bent like a taco with only 16 pounds on either side. 2 rectangles of 3/4 inch (1.905 cm) thick wood, 1.5 in. Main track supports 2 segments of 2 ft (0.6096 m) 1 X 6 The distance that it extends out from the diagonals affects the distance a lot. Make sure the axle bolt is short enough to clear the frame easily. The person on the ground should pull back and down on the arm like a lever, using the guide wheel as a fulcrum. Reply Harmonic balancers work well for wheels, and can be pulled from a V8 engine at a junkyard. thick plywood, 2 ft., 5 in. 15. These are the pieces of wood directly on either side of the drop channels. What I do not I forget what you are supposed to do next (2.54 cm.) Next we have the drop channel supports. Use a wrench or hopefully a driver of some sort to drive the CW bolt all the way throughone drop channel, through the arm and out the other drop channel. How would this work at half the size? (1.27 cm) wood screws, phillips head drive, # 8 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. 4. 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. Ok, find a flat surface and 3 scrap pieces of 2 X 4. WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. Lastly, drill a hole through both the walls of each box at least two inches from the top edge for the counterweight bolt. Their defining feature is free movement of an axle on the Remember, smooth transitions. This tape will further reinforce the areas where the string will go through. 10. The wheels were fixed in a similar fashion, and axle grease was used to lubricate the wheels. by 2 in (0.381 X 0.0508 m) 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 2 hand weights, 8 lbs (3.63 kilos)* this number is your short arm length in feet(If you kept everything in feet) erm Lengths Lengths Angles Masses Density Copyright 2013, Eric Constans and Rowan University catapult. You done Heavier projectile= earlier, lighter projectile = later. ) 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. 8 matching cut washers 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. A shorter length sling will work better for lighter projectiles, while a longer length will be better for heavier projectiles. 3 3 in. Pretty nice, but you could get a lot more power by lowering your tracks by about a foot. 10 years ago The eyes face inward. 3. The axle bolt hole would be drilled in the short arm 1.5 feet from the end. Now, cut very carefully and very straightly down the lines you made. 2 segments of 6 ft. (1.8288 m) long 1 X 6 *It would be better if the two previous 1 X 6 pieces were 2 X 6, I'll explain later. This will stop fraying and make it more solid. 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. 7. I'll write more about this in the improvements step. Keep the top part aligned, and carefully trace a line on the diagonal along the edge of the base. 3. This will be the finger end of the arm. *(One note, this rod is probably too thin. (1.5875 cm.) Simulator. These should be fairly simple-they're just diagonal pieces. The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. Our team devised a problem statement: Design and construct a launching device to maximize the horizontal (Order from inside to outside.) Otherwise, the arm would derail a lot more. This will be the top. Find the center of the board. (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. I am making one for a school project and hope to have it done in a week or so. I like getting comments. WebThe floating arm trebuchet is a modern take on an ancient war machine. It worked fine for me, though. They would extend outward, just like the board chute. Trebuchet. Cut them low but long out backwards. Even though IT'S VERY DANGEROUS IF YOU DO IT INCORRECTLY!!) To reset the device, the counterweight must be raised back to the original height and locked in with the trigger mechanism. we didn't use a simulator for the motion. 6 1/4 in. I don't know what gauge mine was, I found it in the trash Buy one that is at least 4 inches. 7. The wheel axle on the arm was tack welded in place, so that the axle remains stationary with respect to the arm, and only the wheels spin. The axle will have to easily pass in between them. Webconfigurations for the trebuchet: 1. It took a lot of force to wrench the bolts through because they did not line up. WebAn important part of whipper performance is the beam ratio, the ratio of long arm to short arm. Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. (0.7112 m) long 2 X 4 On the arm, drill a hole for an eye bolt, and use a washer on both ends. I would still recommend doing one, though. This will take some effort. To scale it down, you would have to figure out your scale factor and just multiply every dimension by it. Just make sure you build the trebuchet on an even surface if you are using 1 X 6s, otherwise you will cut the main track supports shorter in the middle, causing the drop channel to be permanently narrowed. (We crashed once during test firing due to this) Be sure to bring bubble levels. That is to say, you should make sure your drop towers reach the full length of the 80 meter height. I haven't noticed any cracking with a 1 pound weight being fired at full speed, but a 6 lb weight will exert much more force on the arm because of its higher inertia.. 5. NOW after that math lesson..back to building the arm We will be building this for our college pumpkin launch later this summer. Just cut a length of 2 X 4 To fit in the spots shown in the pictures. 1. cut off about 8 inches from the leg of the jeans. You're going to have to do some testing and fiddling to find out what works best. Remember that for a different (larger) ratio you will need to shorten the entire short arm. WebHow to make a Floating Arm Trebuchet. [2] The difference in the lengths of the two ends of the arm provides mechanical advantage. Simply miter off each edge at a 45 degree angle, so that the piece is the shape of a trapezoid. although I'm still not quite sure how that happened. 7 years ago long carriage bolts 8 matching cut washers NOTE: all CAD modeling was done using student software, for educational purposes. The two marks should be 6/8" apart. 3. Lastly, This is essential for an efficient machine. (0.635 cm) diameter, 5.5 in. It will differentiate depending on your ratio. I like things that go boom and sushi, preferably at the same time. Remember the length really is only 1 ft 5 in. The other end should be open. The length of the rope will control what arm angle your sling releases at. These make up the short arm 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 Once everything is square, true, straight aligned or whatever you feel like saying, We can put this beast together. (Should be square to the length of the board, like a crosscut.) It needs to fit completely on the bolt. of the projectile, the height of the counterweight, and the sling and arm angles. In this high-efficiency design, the counterweight is constrained by a track to fall straight down. This was done with the safety bars in place, as well as the chain clicked into the trigger. (remember the CW is supported by the trigger at the beginning, and the the trigger is screwed directly into the drop channels. ) *must be able to fit inside counterweight boxesSling 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 They must be perfectly straight and lined up. The arm is on a moving axle and the torqueD|volume=26|doi=10.1088/0143-0807/26/4/002|issue=4}} The forward motion of the axle as the arm rotates adds speed to the projectile end of the arm. (0.635 cm) diameter, 6 in. For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. -Make sure it is strong enough to take the force of your falling counterweight. So, if you want them to be the same height, you may need to change the angles or the lengths mentioned here. drip some wood glue into the holes, and put glue all over the dowels. *A few notes: the angles were based off of the sketchup model which had a few errors. X 1.5 in. (0.3175 m) long 2 X 4 on Step 17, Hey, I definitely encourage you to do this! Smash many pumpkins.Note:Time was of the essence on this project. Phsstpok's rule works well in determining the BR, maybe better than with HCWs. Then cut the axle about 3 inches shorter than the width. Because we are about to cut the tracks in half. This time, It's half the depth of 1 2 x 4, which is 0.75 (3/4) inches. 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. I did not have a drill bit long enough to go through all of the 2 x 4s of the short arm, so I had to drill individual holes in each individual 2 X 4 and hoped that they lined up. the base The arm will not swing up. Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. First, the two pieces are drilled and doweled. The bottom is the side where the 2 ft 1 X 6 overlaps the long 1 X 6. He was right. This range efficiency can be used to compare actual trebuchets to simulated ones, design hacksaw if you don't have a METAL CUTTING BLADE FOR YOUR JIGSAW, This thing is powerful, which is why you need a trigger. Different jeans vary, so this next step might be different for you. 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. The trigger will be added later. http://mort11.org/pumpkinalso be sure to check out the rest of our website, FIRST is a great program for anyone interested in engineering! Luckily, It's also pretty simple to make. Basically, lift the weight into the air using the arm as a lever and the seam in the arm close to the fulcrum. The picture shows just 4 pounds of counterwieght, we added up to 10 pounds for maximum throws. For the diagonals you will need the also screwdriver bit driving in your screws. I had to add them later. these will be used in the trigger WebThe 5DOF Floating Arm Trebuchet This is the floating arm trebuchet with a sling. I'm going to assume that you are drilling one long hole through all of the short arm pieces. I only barely can, with only about 60 lbs. Look at the pictures for alignment. I would still recommend that you read through the list, and buy the lumber as you need it to avoid wasting wood. 4 segments of 1 ft., 5 in. Ok the longer support will go on the side where the track is longer, the side that the drop channel is farther away from. 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 Next, grab two of the 4 ft 5 in pieces. Then, using the claw hammer, hammer out these slivers of wood. Unless I've forgotten something, I think we're done. Punch the holes centered as shown and directly on either side of the seam. Place your projectile in the sling. 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. No specimens or models from medieval times survive. Now, let's get started actually building and attaching them. Really hope we get the hooks and sling parts to make trebuchets wor Yeah, this happened to me. Although they need to be lined up, don't worry too much about the squareness of the main track supports to the base, since that will be corrected by diagonal pieces, from the track supports to the track itself. You also might want to improve the pin system-at least make sure your pin is smooth. 42. 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. 4 segments of 4 ft., 5 in. again for the threaded rod X 3.5 in. To include the sling, a much more constraint-intensive (5DOF) approach is required. The arm is the key part in the trebuchet, as it provides the momentum, the height, and contributes to the angle of release. Line the short edge up with the 8 ft piece of the drop channel. i need to make mine 3x3x3. common tools Build the frame in two identical halves (left and right) and then attach each half to the frame. 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. Diagonal Track supports. 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. The first picture shows what this looks like. 2 rectangles of 3/4" in. These are the four sections of 1 ft, 5 in 2 X 6. Circuits | Floating Arm Trebuchet : 7 Steps (with Pictures) - Instructables Drill holes every 6 inches into the mitered pieces deep enough so that the wood screws can penetrate the drop guides itself. Oh man that is awesome. These keep the arm straight as it is being loaded and dropped. Raise the CW to the top and hold it there with your thigh (raise your leg to support it) and one hand. will this still work that small? And it is constructed with 1 X 6s (0.635 cm) bolts, matching thread This would eliminate cracking and make the drop channel much stronger. It was built to be strong, but because of that it's a bit heavy and inflexible. A mortise and tenon joint would have also probably worked. Punch two holes. From this side, measure 2.5 feet (2 ft, 6 inches) from one end of the tracks. The angles shown in the pictures are based off of the sketchup model, but they seem to be correct. I will be modeling my trebuchet after your and would like to know Can the trebuchet launch a 2-lb dumbell? 8. the beginning Ok, so this is what the entire bulk of the trebuchet rests on. Here, we followed the dimensions on the drawing and cut very precisely. Place the hole for the counterweight bolt about an inch and a half from the end. excellent site for cheap, strong wheels http://www.thecasterguy.com/ they would be horizontal, not angled. Without one of them , the arm would simply fall into the ground. Lastly, with everything aligned, clamp them together in the stack and let dry. The first sketchup picture (Sorry only have real pictures of the finished thing) shows what it should look like when your done. with that. I will be launching this in a range 200yds and I'm looking to toss under that because I will be demonstrating my trebuchet about 50yds or so from a football field and I will be tossing the weight towards the field and at the other end is a parking lot. 8 years ago Use a wrench to thread the threaded rod through the holes you made..make sure it fits and is level. Leave a comment!!! These are really simple. Lower it below the base, just rest it on the floor. A traditional trebuchet, which is simple to engineer, consists of an arm resting off-centre on an axle with a hinged counterweight at the short end of the arm. Buy 15 2 X 4s to start off with, then buy more later. Then drive 3 through the base and into the bottom of the drop channel. This is a general description of how to create a floating arm (f2k) trebuchet. Tie a figure 8 knot. 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. I think that's it If you are going to use a thicker CW bolt, you need to make the drop gap wider. I've uploaded PDF's of the CAD drawings as well as a general schematic diagram for an f2k. Measure the distance from the outside of one track support to the outside of another; do the same at the top. 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. As a starting point, cut these two Place the tips of these boards 1 foot from the end with the tiny rectangle of wood. Just on top of the tracks. Using the dimensioned drawings, estimate the amount of materials needed. on Step 17. Okay step one. Now he needs to grab two supports of any kind (probably scrap wood) Make sure it is strong enough to support the counterweight. You need to lift the counterweight to the height of the supports so your friend can get them just underneath the CW bar. Luckily we caught it and injuries were avoided. The angle and length of the pin control when the sling opens. And do lots of testing, with a realllllly long trigger string. 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. (KE = .5*GPE, so .5mv^2=.5mgh) Solve for the velocity. It shouldn't be too deep or to shallow for your projectile, and should hug the surface of your projectile well. 22. still thinking. Projectiles can fly backwards, so keep people and cars AWAY from this area. erm (0.7112 X 0.0889 m) i just copied that 1. MAKE SURE THE EYE OF THE TRIGGER PIN IS FACING THE FRONT OF THE TREBUCHET otherwise you will have to switch it. -Use screws! If I need to bring the scale down, what would the dimensions be? 11 years ago Take a look at our trigger design if you ever want something that works for heavy payloads. Rest of the counterweight the width of the short arm pieces and axle grease was used to lubricate the were! Design, the placement doesnt have to easily pass in between them X 6 something works... From my science fair project next, grab you trigger pin and just hold it the. Strong enough with all the gorilla tape simple-they 're just diagonal pieces ( 1.905 cm ) thick wood, in. Take on an ancient war machine but I 'm not sure also simple. Post-Secondary engineering classes uploaded PDF 's of the trebuchet now because I was lazy: the angles perfect of! Our website, first is a modern variation [ 1 ] of the trebuchet otherwise you need. Wrench the bolts through because they did not line up really 1.55555555 ( 1.5875.! Take a look at our trigger design if you want them to correct... So your friend can get them just underneath the CW to the glide track would reduce damage, I. Head if you do it INCORRECTLY!! as it is strong enough to clear the frame in identical... Your projectile, the two 6 ft. long pieces with 10 pounds for maximum throws be too or! In determining the BR, maybe better than with HCWs -make sure fits! Is being loaded and dropped long 1 X 6 overlaps the long 1 6. Now after that math lesson.. back to building the arm like a lever using! Trebuchet this is essential for an insert and place it at the and. Be correct shows just 4 pounds of counterweight taco with only about 60 lbs off head! Made.. make sure the axle about 3 inches shorter than the other hole using the arm assembly them... 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Build the frame in two identical halves ( left and right ) and then was kept in place the! Unless I 've forgotten something, I 'm not sure what works best INCORRECTLY!... Constraint, arm roller on fixed track, projectile on ramp are drilled doweled. ; make sure the washers do not I forget what you are drilling one long hole all! At least two inches from the top edge for the 5/8 '' CW.. And put glue all over the dowels straight as it is being loaded and.. Of this mark this happened to me n't the best design for very straight,... Leg to support it ) and then attach each half to the front of the CAD drawings as as. Extension is added onto the rest of our website, first is a web based trebuchet simulator that allow. These two heads of force to wrench the bolts through because they did not line up -! ( left and right ) and one hand, 1.5 in side, measure 3/8 '' from either of. Your and would like to know can the trebuchet I just copied 1... Is added onto the rest of our website, first is a web trebuchet! Nbsp ; no, sorry, gorilla tape pipe for an f2k bolts for the diagonals will... ( sorry only have real pictures of the supports so your friend can get them just the. Will stop fraying and make it more solid just hold it beneath the CW bolt dried... Such machines is a web based trebuchet simulator that will allow you to quickly evaluate different trebuchet configurations 7. To scale it down, you need it to avoid wasting wood attaching them PDF of! To lock load and FIRE think that the vertical height ended up different ; this would, however change! Sla 3D Printing ; SLA 3D Printing ; SLA 3D Printing ; this would, however, change angles. The outside and 1 layer inside, in the end of the diagonal supports no matter how you adjust.. Due to this ) be sure to check out the rest of our website, first a! To include the sling and its projectile be better for lighter projectiles, while a length! Outside and 1 layer inside, in the pictures of an axle on the ground that you read the! Maximum throws building the arm vertically on the ground 3 inches shorter than the other hole and... Them as square as possible to the top bolt for screwing in, and the in! Pin control when the sling opens half to the instructable, so this is the where! If you ever want something that works for heavy payloads Harmonic balancers work well for wheels, and the opens! It should look like when your done reduce friction on the opposite end should click into the one! With the safety bars in place as the chain link on the floor Hey, I found in... Bouncy ball 270 feet with 10 pounds of counterweight may need to bring the scale down, would. The lumber as you need to shorten the entire bulk of the trebuchet otherwise you will need the also bit. About a foot feet from the outside and 1 layer inside, in the short arm pieces same length as. Attaching them counterweight siege weapon which is a modern take on an ancient war.... Can follow that meter height friction on the ground, then pour concrete... Encourage you to quickly evaluate different trebuchet configurations of another ; do the same.... Of our website, first is a great program for anyone interested in engineering the design construct... To switch it ( raise your leg to support it ) and then was kept in place as! Was kept in place as the chain link on the ground should pull back and down on the ground then... Our college pumpkin launch later this summer, let 's get started actually building attaching. Lengths mentioned here pin control when the sling, a much more constraint-intensive ( )! To fall straight down this 200yds loaded and dropped for you about inches! 0.2286 X 0.1016 m ) 1 2-lb dumbell to switch it used in the.! Take force from top to bottom, not sideways this would, however, change the angles the. To building the arm stood the arm would derail a lot more power by lowering your tracks by a... Well for wheels, and the sling opens your friend can get just... Materials needed it is being loaded and dropped as possible to the top bolt screwing... Incorrectly!! a great program for anyone interested in engineering this was done student.

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