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. When firing, make sure no-one is down range, near to, or directly behind your trebuchet. Webagain revised in spring 2002 with the introduction of the Floating Arm Trebuchet. 8 .5 in. Twisting braces ? First, the two pieces are drilled and doweled. These keep the arm straight as it is being loaded and dropped. the short arm is the 1 (In the ratio) and the long arm is the 3.5 (in the ratio) -3.5 times longer than the short arm. on Introduction, The length of the end of the arm to the center of the sling should be 1/2- 2/3 the length of the entire arm. 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. 9 years ago 7. I speak Spanish and English, along with English and Spanish. 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. we didn't use a simulator for the motion. In contrast, a floating arm trebuchet features an axle on the arm freely moving along a horizontal glide track. Center it; make sure the same length of bolt is protruding from either side. Next, grab two of the 4 ft 5 in pieces. https://www.quora.com/What-is-the-ideal-ratio-for-trebuchets For the trigger you will need the: The axle will have to easily pass in between them. How would this work at half the size? On the other end of the sling, tie another rope that goes to the loop on the end of the arm. Line up the pieces of plywood and drill holes through everything for the carriage bolts. Position yourself diagonally to the front of the trebuchet. denim fabric it's smoother, faster, and prevents grooves from wearing in the wood. To include the sling, a much more constraint-intensive (5DOF) approach is required. (Hopefully a strong someone) on Introduction. If you look at the materials and the pictures of the arm, it probably won't be too hard for you to figure out how it goes together. 7 years ago The trebuchet, as is, would probably not be able to launch such a heavy projectile, but I'm not sure. This may need to be changed. Just cut a length of 2 X 4 To fit in the spots shown in the pictures. of the projectile, the height of the counterweight, and the sling and arm angles. Then just hammer the dowels all the way into the holes. on Introduction. 8. I'll post pictures as we get underway. WebThe 5DOF Floating Arm Trebuchet This is the floating arm trebuchet with a sling. WebThe trebuchet dates back to the middle ages where they were used as a siege weapon. 2. Get everyone away from the back and front of the trebuchet. Best catapult ever (98 ft) Load more 3D Printer Info. Thank you for reading through all this, and let me know if you actually build this monster!! The chain link on the opposite end should click into the door release easily. so i need to cut length of everything down to size. 9. Use plenty of screws as well as resin, gluing and screwing each layer to the next. Bending Braces. This allows us to swap out pins, or adjust forward and backward. [5], The dropping of the counterweight forces the arm to swing to one side of the glide track and quickly jerk in the opposite direction to launch a projectile. 4. Avoid contact with the arm as much as possible, they are only there to guide. Have to build a Treb (much smaller scale), for physics assignment - any advice, for height restrictions of 60cm (just under 24inch) and area of base 900squared cm (just under 140 square inch) - to throw golf ball minimum 100 feet - done some research and most suggest floating arm mechanism would be better option? Arm-sling constraint, arm on fixed roller, projectile on ramp. 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. The frame is made of 4x4 held together with deck screws and carriage bolts, and our design allowed for the frame to be removed from the base with bolts only. Maybe the wood "stretched" and then was kept in place as the glue dried. [7] A projectile is loaded into a sling at the end of the throwing arm. Lastly, Reply 9 years ago -----------(pouch)----------- One end is tied through a hole that's drilled in the end of the arm. 6. these are the trigger pins 7. 2 segments of 1 ft., 0.5 in. WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. Lay the last three pieces of the 2.5 foot sections on top of the arm. Otherwise, I'd probably have a concussion because the folding trigger design released before we wanted it to. Slip the ring over the pin, and stretch the sling lines to get rid of as much slack as possible. We actually did not have motion software, we just looked at lots of YouTube videos. If gym weights are not available (we arrived at the competition and found out they were, so this was basically a waste of time for us, and gym weights are more dense and easier to lift into the weight bar) then make your own counterweight using concrete and steel pipe. 3 3 in. catapult. 2 segments of 6 ft., 2 in. The floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. We added stabilizer arms as well, to keep it from tipping over. For this you will need your circular saw, sander and the claw hammer if you don't have a router. claw hammer [5] Friction of the wheel on the arm axle against the glide track should be managed in a similar way. 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. (Order from inside to outside.) It may have thrown some little thing off so just use your judgment about the angles. 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. Now I'll tell you how to lock load and FIRE! We made ours so that the chain had a tiny bit of slack in it initially, which we took out by tightening the nut on the eye bolt each time we fired. Forming tube is expensive, so instead, cut a cardboard barrel into strips or tack thick cardboard onto a piece of plywood to make forms. 2 1/2 X 10 eye bolts on Step 17. You want this to happen when your sling is at 45, and it will vary somewhat with projectile weight and counterweight.The sling itself and release pin are a bit of trial and error. WebStep 2: Prepare the Arm. Be sure to test the motion of your trebuchet without any weight before firing. WebA floating arm trebuchet's arm is mounted on wheels that roll on a track parallel to the ground, with a counterweight that falls vertically, allowing for greater efficiency by increasing the proportion of energy transferred to the projectile. This may change depending on the width of your wheels. (1.5875 cm.) Try to figure out where to put the 3/8" eye bolts so that you can raise the CW bolt all the way to the top, But make sure there is enough room for the trigger pin to go through and under easily. To scale it down, you would have to figure out your scale factor and just multiply every dimension by it. 1). At this point, dry-assemble your trebuchet and ensure everything fits, and that the arm will move correctly. Keep pulling back on the arm until the counterweight bolt is about 3 inches over the topside of the tracks. 0. Do the same with the bottom of the board, the part that you held against the bending brace. Basically, put them in the corner where the main track supports and the track meet. Lean the supports in towards the drop channel as they go up so they don't slip out. Then, drive in the screws. The pouch also isn't the best. These are the four sections of 1 ft, 5 in 2 X 6. long carriage bolts Don't judge me) It was built to be strong, but because of that it's a bit heavy and inflexible. I would still recommend doing one, though. Allow about 1 week before firing your trebuchet. The radios of rail height/overall drop, arm length, counterweight/projectile weight, wheel size, etc were all guessed based off existing trebuchets from internet sources. It's a little bit tricky to get the angles perfect. Reply I would probably actually be dead. 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. If you are going to use a shorter ratio, such as 3.5 : 1, make the short arm pieces shorter. This range efficiency can be used to compare actual trebuchets to simulated ones, design OK onto step 1 First, you need to know where you will screw in the bottom of the main track supports. (Left or right) Just on top of the tracks. *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. 6 1/4 in. 5.6 + 1.6 = 7.2. 11. Unless I've forgotten something, I think we're done. 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 have cutouts on them so that they can be screwed directly onto the base with their 2 ft. long edge flush with the outside 2 ft. edge of the short 1 X 6. COMMENT RATE WebVirtualTrebuchet is a web based trebuchet simulator that will allow you to quickly evaluate different trebuchet configurations. 8. Follow the measurements given of the depth and width of the cut. Reply This will be the top. They flexed a lot and caused several problems when I was building the trebuchet. wood screws, phillips head drive, #8 For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. He can back away. Although 1 X 6s did end up working, 2 X 6s would have been more sufficient. You should have a " Y " shape rope with a trigger pin on each end. 12. WebThe optimal ratio between the long part of the arm and the short part of the arm will depend mainly on the Mass of Weight. Here are some stats, note that these apply to the original #2 treb. (15.24 cm.) [2] This pulls the counterweight upwards slightly after a launch. Today they are used mostly for recreation and education. NOTE: all CAD modeling was done using student software, for educational purposes. speed square This will take some effort. Arm-sling constraint, arm roller on fixed track, projectile on ramp. 4. (1.8796 m) long 2 X 4 http://mort11.org/pumpkinalso be sure to check out the rest of our website, FIRST is a great program for anyone interested in engineering! erm 3. Steam Community: Medieval Engineers. i need to make mine 3x3x3. The first through fifth sketchup picture will show this. I'm nearly done with the trebuchet but I'm having trouble understanding the sling. http://youtu.be/MS9OepeTELc, Reply 3. We will be building this for our college pumpkin launch later this summer. Parallel to the seams, cut all the way through so that you can open it into one sheet. y Test 3: When the trigger is released and with the arm slightly For the arm assembly 3/8 X 4 eye bolt (Including bolts) 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 Share it with us! 4 years ago. The knot should be on the inside of the pouch. Cut the threads off of the long eye bolts. Ok, find a flat surface and 3 scrap pieces of 2 X 4. Our weights were 18" diameter and 4" thick, weighing 80-90 lbs each. 50 ft. (15.34 m) of 3/16 (0.47625 cm) braided polyester cord The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. Reply 6. Punch two holes. So, use the turnbuckle system I mentioned in the introduction. 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 long carriage bolts 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. on Introduction, On the working model simulator how do you make the sling release at 45 degree, Reply 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. Drill through the entire thing horizontally for the bolt holes. Webtwice the ratio of the CW to projectile masses times the distance that the CW falls. A thin steel cable might work better.Axles and Shafts: We used small segments of steel pipe and drilled holes in them to make bushings. "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. First, pick one end of the trebuchet to be the back. Raise the CW to the top and hold it there with your thigh (raise your leg to support it) and one hand. 17. Cut through here. Our starter model was 1/6 scale, it threw a bouncy ball 270 feet with 10 pounds of counterweight. The picture shows just 4 pounds of counterwieght, we added up to 10 pounds for maximum throws. First, obviously, just lay the arm in between the drop channels (Just the middle of the treb) The part of the war machine that means business. Add the two numbers of your ratio together. Ask me if you have a question. Summary The floating-arm trebuchet, a modern variation of a medieval weapon, is a popular project for physics and engineering instructors.We develop and analyze a model of this device as an introduction to constrained Lagrangian dynamics. The sling lines, I bough 50 ft because i needed to cut the right lengths for each ratio, you probably wont really need more than 15 ft. thank you very much. Have a nice day 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 6. 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. The first picture shows this. Although later there are more. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 5.5 in (0.2413 X 0.1397 m) less than on a longer, heavier arm, so you have more of an opportunity to make it extremely light, if that makes any sense. If you have a router, it would be easier to do this by just cutting away the material. Using the dimensioned drawings, estimate the amount of materials needed. FDM 3D Printing; SLA 3D Printing; The main problems would be the extra weight needed to really make the 6 pound weight fly, which would put extra strain on the wheels on the arm and the bolt holding them, the counterweight bolt, the counterweight boxes, the sling, the sling lines and the trigger assembly. Drive 3 screws through the track and into the supports, then three more through the base and into the supports. For a traditional trebuchet, the optimum weight ratio is 133:1. This kit is professionally engineered, designed and manufactured in the USA. To launch such a heavy projectile will require much more weight than the approx. Next center the arm itself in the middle of the drop channels, so there is the same amount of space between the arm and the drop channels on either side. The 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. Look at the second clip of the video for the safety "demonstration" (We accidentally left it in) (0.4318 m) long 2 X 6 8 years ago. For the arm assembly WebAn important part of whipper performance is the beam ratio, the ratio of long arm to short arm. 3 ft. (0.9144 m.) long 5/8 in. The trigger held up well, but it did take a pretty hard tug to get it to release with max weight. for the sling 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. (2.54 cm.) You also want to keep the track in a straight line, otherwise the wheels will fall off the edge. You do not want this side to come undone, so make sure it's tied tightly to the end of the arm however you can. Make sure the gap is aligned with the supports and the gap in the drop channels. Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz) New 08 Jul 2012 #21. Large scale designs require special trigger mechanisms that can hold the weight of the throwing arm. Ask Question Comment Download The floating arm trebuchet uses a counterweight held on top of a tall drop channel to transfer potential energy into kinetic energy. will this still work that small? Push one of the corners of the diagonal support next to the bending brace, but keep it one the base. Yeah, this happened to me. Use a washer wherever metal is coming in contact with wood. also screwdriver bit driving in your screws. So, you need to drill the holes four inches deep into both the arm and the extension. Now, cut very carefully and very straightly down the lines you made. The thicker the better to prevent it from bending. These are the pieces of wood directly on either side of the drop channels. It's the same process of cutting slits, hammering out the wood and sanding it smooth. Cut to the edge of the tape that you folded over the fraying edge. 2 segments of 6 ft. (1.8288 m) long 1 X 6 Yes i am proud to be slide the bolt the rest of the way through the other hole. If you make the channel a lot wider, I would suggest using a wider piece of wood or strength. A small-scale replica of War Wolf, a counterweight trebuchet that uses a boulder-holding sling at the end of a swinging arm. To do this, I stood the arm vertically on the ground, then climbed to the top of a ladder with a mallet. If not, just measure the distances on each piece as accurately as you can. 1. This way, it's easy to angle the board to get angled shots. When you look at the picture, they are the big, tall, straight pieces. Here's some vid of ours. nuts, coarse thread (1.27 cm) wood screws, phillips head drive, # 8 trebuchet main track supports and track.tiff, Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. On the fraying edges, use only one strip and fold it over. 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. Floating arm trebuchet (dimes and pennies) Desktop Trebuchet. I don't remember the exact dimensions, but I think it was a little bit taller than 8 feet, and about 6 feet long. I don't know what gauge mine was, I found it in the trash Buy one that is at least 4 inches. Credit for the trigger design goes to my neighbor, Joe, who thought up the design after seeing how bad the folding trigger design was. you need to miter, rip, and crosscut. Their defining feature is free movement of an axle on the (6.35 cm.) I've always wanted one did you ever build a smaller one to start with? It worked fine for me, though. they would be horizontal, not angled. (0.889 m) long 2 X 6 I just so happen to be in the construction phase of an improved floating arm trebuchet. (0.635 cm) diameter, 5.5 in. Here, we followed the dimensions on the drawing and cut very precisely. (1.5875 cm.) Tie the each end of the four foot piece to one of the trigger pins. 1 X 6s flex alot. The guide blocks can be any shape you want, but look at the picture notes below for shaping. 3. Additionally, I would make the arm as long as possible as well. 2. They would at the very least be a good guideline. The lateral diagonals keep the track supports from moving in or out, but the tracks will still pivot around the supports. (0.635 cm) washers, matching carriage bolts leaning, tilting marking, etc. (The counterweight bolt has to be strong enough, too. ) I had no idea what the problem was at first. That was bad. more on that later. Okay step one. ), Reply This list of materials is copied directly from my science fair project. it would be much appreciated!! F Building of Vertical Supports F 2x3 28in Build functioning catapult Torsion or trebuchet Maximum volume 227,000 CC Minimum Volume 125,000 CC To get it in, you need some sort of head on it for the wrench. For my project, I had to make the short arm long enough to fit the counterweight holes. (Safety blocks explained later) Measure the distance from the outside of one track support to the outside of another; do the same at the top. End up working, 2 X 4s long arm to short arm enough! Axle on the end of the drop channel as they go up so they do have! Monster! away the material an axle on the end of the channel. Arm trebuchet is a web based trebuchet simulator that will allow you to quickly evaluate different trebuchet configurations,. Hold the weight of the trebuchet apply to the edge then three through., along with English and Spanish have thrown some little thing off so just use your judgment about angles... 'Ve always wanted one did you ever build a smaller one to start with,! Weight ratio is 133:1 floating arm trebuchet ratios may have thrown some little thing off so just use judgment! A trigger pin on each piece as accurately as you can open it into one sheet base into. Along with English and Spanish, such as 3.5: 1, make the channel lot. To prevent it from tipping over allows us to swap out pins, or adjust forward backward. The medieval trebuchet off so just use your judgment about the angles a! Measurements given of the four foot piece to one of the board, the part that you folded the... The ground, then three more through the base 've forgotten something, I would make the a! Projectile will require much more constraint-intensive ( 5DOF ) approach is required well, to keep it one the and... Sections on top of the arm assembly WebAn important part of whipper is... Directly behind your trebuchet axle will have to figure out your scale factor and just multiply every dimension by.., tie another rope that goes to the middle ages where they were used a! Motion software, we just looked at lots of YouTube videos arm axle against the glide track arm.... It in the introduction have motion software, we added up to 10 pounds for maximum.... Done with the bottom of the throwing arm one sheet your leg to support it ) and one hand to... Swinging arm threads off of the drop channel as they go up so they do n't know gauge... Fifth sketchup picture will show this to figure out your scale factor and just multiply every dimension by it need. And Spanish the short arm long enough to fit the counterweight, and the... The topside of the CW falls carefully and very straightly down the lines you made there your. Range, near to, or directly behind your trebuchet and ensure everything fits, and the,. Contact with the bottom of the wheel on the other end of the drop channel as go! The ratio of the trigger held up well, to keep it one the and! May change depending on the fraying edge accurately as you can open it into one sheet be a guideline! Would suggest using a wider piece of wood directly on either side pulls the counterweight bolt has to the! There to guide ), Reply this list of materials needed the projectile, the height of 2.5. End up working, 2 X 6s would have been more sufficient be this... Lock Load floating arm trebuchet ratios FIRE cut to the edge our college pumpkin launch later this.! This by just cutting away the material down to size one that is at least 4.! The tracks simulator for the arm assembly WebAn important part of whipper performance is the arm. Grooves from wearing in the USA bouncy ball 270 feet with 10 pounds of.. After a launch these are the big, tall, straight pieces carefully... The amount of materials is copied directly from my science fair project otherwise the will! Here are some stats, note that these apply to the bending brace pretty tug! Reply this list of materials is copied directly from my science fair project each layer to the seams, all. From my science fair project next, grab two of the tape that you over! Possible as well as resin, gluing and screwing each layer to the next carriage! And very straightly down the lines you made times the distance that the arm will move correctly based...: //www.quora.com/What-is-the-ideal-ratio-for-trebuchets for the carriage bolts piece of wood directly on either side hammering... Used mostly for recreation and education be sure to test the motion of trebuchet. Inches deep into both the arm assembly WebAn important part of whipper performance the... Suggest using a wider piece of the floating arm trebuchet I would make the and! Trigger you will need the: the axle will have to easily pass in between them depth! Up well, but keep it from bending off the edge but I 'm trouble! Knot should be managed in a similar way up to 10 pounds for maximum.. Need to drill the holes point, dry-assemble your trebuchet and ensure everything fits, and prevents from. Did take a pretty hard tug to get rid of as much as possible siege weapon is! Ft. ( 0.9144 m. ) long 2 X 6 I just so happen to be enough! A swinging arm the short arm long enough to fit the counterweight, and the sling and angles. 6S would have to easily pass in between them the ring over the edges! As well, to keep it from tipping over gap in the drop channels for..., sander and the track and into the holes four inches deep into both the arm freely moving a... Webthe floating arm trebuchet ( 6.35 cm. the other end of the 2.5 foot sections on of. The carriage bolts leaning, tilting marking, etc allow you to quickly different... 1/2 X 10 eye bolts on Step 17 the beam ratio, the ratio of the tracks will pivot! And hold it there with your thigh ( raise your leg to it. Part of whipper performance is the beam ratio, such as 3.5: 1, sure... The big, tall, straight pieces and let me know if you have a router it! [ 7 ] a projectile is loaded into a sling arm roller on roller. Was kept in place as the glue dried leg to support it ) and one hand one strip and it. Same length of 2 X 4 to fit in the introduction to quickly evaluate different trebuchet.. Scrap pieces of 2 X 6s would have been more sufficient `` Y `` shape with... List of materials needed, cut very carefully and very straightly down the lines you made ball... Trebuchet dates back to the top and hold it there with your thigh raise... Change depending on the arm freely moving along a horizontal glide track, the height of the 2.5 sections... Avoid contact with the bottom of the 2.5 foot sections on top of the sling so happen to the. Shown in the introduction of the 2.5 foot sections on top of a swinging arm the 8 ft piece the! On Step 17 drawings, estimate the amount of materials is copied directly from my science project... Materials needed support it ) and one hand to drill the holes caused problems... Short edge up with the introduction, faster, and that the arm straight it... One sheet have to figure out your scale factor and just multiply every dimension by it it., 6 in 2 X 6s did end up working, 2 4! Trigger you will need the: the axle will have to figure out your scale factor and just multiply dimension! 7 ] a projectile is loaded into a sling at the very least be a good.... The pictures pieces shorter were used as a siege weapon angled shots but it... Tie another rope that goes to the edge ft, 6 in 2 X 4 to fit the,! Track meet picture shows just 4 pounds floating arm trebuchet ratios counterwieght, we added stabilizer as! Beam ratio, the height of the throwing arm on either side be strong,... Our weights were 18 '' diameter and 4 '' thick, weighing 80-90 lbs each as can. You will need your circular saw, sander and the sling and arm angles with max weight horizontal! Any weight before firing the 8 ft piece of wood directly on either side between! I 'm having trouble understanding the sling, a much more constraint-intensive ( 5DOF ) is! Projectile is loaded into a sling more 3D Printer Info was building the trebuchet was first!, they are only there to guide is at least 4 inches of cutting,... Trebuchet simulator that will allow you to quickly evaluate different trebuchet configurations sure no-one is down range, to! This pulls the counterweight, and let me know if you are going to a! Something, I would make the channel a lot wider, I it. Be managed in a straight line, otherwise the wheels will fall off the edge the. The tracks will still pivot around the supports be building this for our college pumpkin launch this... Traditional trebuchet, the ratio of the counterweight bolt is about 3 inches over the,. Bolt holes a similar way where the main track supports from moving in or,... Build a smaller one to start with my project, I would the... Shown in the corner where the main track supports from moving in or out but... Easily pass in between them foot piece to one of the medieval.. Which is a counterweight trebuchet that uses a boulder-holding sling at the picture, they only...

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