If you want a better pin system, look at the turnbuckle pin system here. The 5/8" CW bolt bent like a taco with only 16 pounds on either side. 2 segments of 6 ft., 2 in. yes, it works May need to be shortened, look at improvements *look at the last step: improvements. 3 3 in. Lastly, drill a hole through both the walls of each box at least two inches from the top edge for the counterweight bolt. By tightening these outside bolts, you can change the alignment of the tracks and narrow or widen the distance between the drop channels. Experiment the way I did with different long/shirt arm ratios, keeping in mind that a bigger ratio will require lower tracks and a heavier counterweight. 2 hand weights, 8 lbs (3.63 kilos)* Or you could use the angles I give you. Image by Ron L. Toms. The chain link on the opposite end should click into the door release easily. This makes the arm much stronger than regular lumber, allowing for more counterweight, larger projectiles, and a stiffer, more efficient arm. X 3.5 in. Do the same with the bottom of the board, the part that you held against the bending brace. I like things that go boom and sushi, preferably at the same time. (KE = .5*GPE, so .5mv^2=.5mgh) Solve for the velocity. I have no idea if this is the most ideal design for this type of trebuchet. 8 years ago look out for flying cats This, in turn, changes the width of the drop channels to narrow (BAD) or widen (usually better). 1/4" at the very most. I see you mentioned you built 2. Webconfigurations for the trebuchet: 1. As it turned out, our design was over built and held up well. but if you didn't (my bad) You need to recut the drop gap to 1/8" wider than the CW bar, cut the gap in the track slightly wider, and spread apart the track supports directly underneath the drop gap. 10 1/4 in. Taper the arm from a full 3" at the axle to 1" at the finger end of the arm (Fig. thank you, Reply This book is a compilation of step-by-step instructions for how to build nine different types of catapults and trebuchets, including plans for: A PVC Pipe Trebuchet, A Tabletop Trebuchet, The World Famous Floating Arm Trebuchet, The Historical WarWolf Trebuchet, A Rat-Trap Catapult, The Mangonel (or Onager), The Greek Ballista, a We didn't have time to do a thorough dynamic stress analysis, so we slowly added more weight. Today they are used mostly for recreation and education. thick wood, 2 ft., 5 in. Although the trebuchet will work so small, it might be better to increase the arm ration. (third picture on the right) RLT industries trebuchet.com The angle and length of the pin control when the sling opens. This was a bit too heavy as we had to load each weight manually to fire our trebuchet. One thick nail. Then just screw them in. We built a trebuchet that we call the medieval stuff chucker (MSC). If you have a router, it would be easier to do this by just cutting away the material. (6.35 cm.) 7 4.5= about 1.6 LEAVE A COMMENT AND RATE! Beside the arm when it's at rest, these two channels are the tallest point of the trebuchet. 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. Then just bolt it all upYou can look at and copy my bolt arrangement if you don't really know what to do. There are plenty of places you can go on the internet to look for better ideas. The other end should be open. Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. Tie a figure 8 knot. for the carriage bolts So, cut the first twisting brace, on the very front, as wide or narrow as you need it to keep the drop channels straight. 8. For me, this was a little more than halfway through the side pieces. Just in case you didn't know on Introduction. coping saw and orbital sander (The one I used here) However, a floating arm trebuchet is more efficient when built to a size of between one meter and five meters,[5] making it suitable for hobbyists and model builders. 3 years ago. (if you do it, let me know; I'll tell you how to make fireball projectiles), 7 years ago Change the lengths as you need to to keep the drop channels and tracks aligned. Use a bowline knot. This may need to be changed. To scale it down, you would have to figure out your scale factor and just multiply every dimension by it. May need to be made thicker So we built a 10 throwing arm trebuchet. 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 I might include them later. wood screws, phillips head drive, #8 (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. fourth through fifth picture will show this. This variation features a drop channel, which allows the counterweight to fall straight down rather than Thorsen said: boohbah said: unfortunately lordbob is no longer with us , he suffered a fatal blow to the temple from a golf ball. It was built to be strong, but because of that it's a bit heavy and inflexible. thick plywood, 2 ft., 5 in. Simple Table Top Catapult. here is a link to my 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. Long sides of the base We drilled holes in the upright beams perpendicular to the weight bar, directly below where it would hover when the trebuchet is ready to fire, and stuck a piece of 1" steel bar though on each side. Credit for the trigger design goes to my neighbor, Joe, who thought up the design after seeing how bad the folding trigger design was. it would be much appreciated!! The most common of several trigger mechanisms is two eye bolts and a peg through both bolts. 8 years ago Just cut a length of 2 X 4 To fit in the spots shown in the pictures. Tie the longer end of the rope through the hole in the end of the arm. I came across a problem for the quick release. Now we're finally going to add the last few lateral supports and the guide wheel. Allow about 1 week before firing your trebuchet. WebSmall floating arm trebuchet plans. Hey Chans2901, Thanks for your questions, I love trebuchets! Approx 25 ft. (7.62 m)1/2 braided nylon rope And it is constructed with 1 X 6s 6 Attach the sling pouch to the arm. for the carriage bolts Cool ring The two marks should be 6/8" apart. 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. Then, obviously, drive in the screws. 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. 5 years ago. The first through fifth sketchup picture will show this. hacksaw if you don't have a METAL CUTTING BLADE FOR YOUR JIGSAW, Just make sure there is a washer on any side of a bolt that will be touching wood. WebThe Floating Arm Trebuchet: The floating arm trebuchet is a modern take on an ancient war machine. I'm still working on the "improvements" page but everything I was going to mention on it was kind of already mentioned throughout the instructable. Advertisement By: Nathan Chandler Floating bridges are uncommon in large part because the kinds of situations and environmental criteria for them are unusual. You should have 21 feet left. 3. Additionally, I would make the arm as long as possible as well. For a traditional trebuchet, the optimum weight ratio is 133:1. If it is, that will be solved later in the finishing touches step. Jump to page: DocBrown. The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. This is essential for an efficient machine. attach an appropriate length of 1900lb test chain. Main track supports First, you need to know where you will screw in the bottom of the main track supports. Yes i am proud to be Circuits | Floating Arm Trebuchet : 7 Steps (with Pictures) - Instructables The 3/8" eye bolts go at the top of the drop channels. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 9 in. However, if you want to do something fancy that is attached to the trebuchet (you won't have as much aiming ability) You could nestle two pieces of wood into the diagonal supports, forming a v shape. 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. And, I'm not looking to chuck this 200yds. by 2 in (0.381 X 0.0508 m) Although later there are more. These are the 2 2 ft. long 2 X 4s. So, This project is not due until sometime in may, but I will be glad to post pictures. ALSO, the base boards (I used 1 X 6) should be thickened. Drill the hole accordingly, so that their position is similar to the one pictured below. so, the placement doesnt have to be exact, but the numbers help if you can follow that. There's tons of assumptions involved there (what's the drag coefficient of a pumpkin? Although 1 X 6s did end up working, 2 X 6s would have been more sufficient. It was an old rusty double- headed nail. No specimens or models from medieval times survive. Its 3.5 inch edge should also be 1/4" from the long edge of the 6 ft. long 1 x 6. 4 segments of 4 ft., 5 in. This is only to coutersink the screws, do not drill the hole all the way through. Again, not critical. i need to make mine 3x3x3. I had to add them later. What I do not the next 3 specifically show the dimensions for the short side. wood screws, phillips head drive, #8 on Step 15, This is stellar. This is it. Can the trebuchet launch a 6-lb shot? I really appreciate your work in building this instructable. Ask me if you have a question. It's 6 feet long and 2 feet wide. Trebuchet 3: An Improved Floating Arm Trebuchet. on Introduction. 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. 9 years ago Miter off one end of each at a 30 degree angle (with respect to the length of the board) This angle just makes it look cooler. For the arm assembly Lastly, hammer a nail anywhere into the end of the arm. The Floating Arm Trebuchet. Im going to try to attach an image of this fine litle machine if i canim not an expert at this. This may change depending on the width of your wheels. You also will need to push them out slightly, so that the gap is 3/4" at least. Once they are pulled, they do not interfere with the motion of the arm. They should be about 2.5 feet tall. Use the order of bolts and washers on either side shown in the first picture (From inside to outside the order is) : drop channel, washer, bolt, washer, CW box wall, Washer, bolt, Bolt, washer, wall of CW box, washer, bolt. Just get several throught the drop channel assembly and into the track. 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 Ok, now you need to flip over the long (6-ft.) pieces and slide the two foot pieces underneath. 9. The walking arm trebuchet is a good example, which uses an unconventional design to great effect. You done Always stand way back from the trebuchet, and keep the safety blocks in place until you are ready to fire. So, again, cut off the ends of all the 1 ft, 5 in. The lateral diagonals keep the track supports from moving in or out, but the tracks will still pivot around the supports. The pictures show two different models. I have no clue what it is for f2k, but it is a more efficient trebuchet. They're probably correct, I'm just letting you know. Remember, smooth transitions. That was bad. Tape measure, ruler Use your head before you lose your head. this number is your short arm length in feet(If you kept everything in feet) more on that later. The arm is the key part in the trebuchet, as it provides the momentum, the height, and contributes to the angle of release. be safe These can be found cheap at any junkyard. X 3.5 in. Slip the ring over the pin, and stretch the sling lines to get rid of as much slack as possible. If you have a certain ratio in mind but you do not know the lengths, use this example: If you can't get it to the top in one shot, use the supports. Remember the length really is only 1 ft 5 in. 2 rectangles of 3/4" in. *look at the last step, improvements. Lastly, On this Wikipedia the language links are at the top of the page across from the article title. For me, for the side with the longer support, this was about 5 ft, 7 inches from the very bottom of the drop channel. (The counterweight bolt has to be strong enough, too. ) OK onto step 1 Then bolt on the wheels. Now I'll tell you how to lock load and FIRE! The original floating arm design originated in modern times, from professional and hobbyist engineers for recreational and educational use. [7] A projectile is loaded into a sling at the end of the throwing arm. You also need the braided polyester cord and the keychain ring. 6 1/4 in. common tools Approx 25 ft. (7.62 m)1/2 braided nylon rope This would eliminate cracking and make the drop channel much stronger. Next, grab you trigger pin and just hold it beneath the CW bolt. We actually did not have motion software, we just looked at lots of YouTube videos. This directly blocks the weight bar from falling while loading the trebuchet. Wheels are from the rotating platform from a microwave but any small stong wheel will do. Once everything is square, true, straight aligned or whatever you feel like saying, We can put this beast together. Did you need to do anything special with the scaling? To reduce friction of the sling on the launch track, the track should have a smooth surface.[5]. 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. Hopefully you'll use a wider bolt to begin with 10 years ago To dowel the pieces, simply drill two holes into both the arm and the extension. 17. (1.8796 m) long 2 X 4 This one is pretty bad. Yes I want a small one for the classroom and large one for the field. The distance that it extends out from the diagonals affects the distance a lot. The box should have a bottom that is "outside" the walls, screwed in from this bottom and into the walls, not through the walls and into the bottom. *(One note, this rod is probably too thin. Avoid contact with the arm as much as possible, they are only there to guide. Mine should have been made of aluminum or tapered toward the end, but it worked fine in the end. This will take some effort. Unless one eye bolt cannot support the weight, relax. 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. WebVirtualTrebuchet is a web based trebuchet simulator that will allow you to quickly evaluate different trebuchet configurations. 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. Grab 3 of the 2.5 foot pieces. The arm wasn't too hard to extend, BUT whatever you use to join the parts MUST be strong enough. 6. 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 If you need to beef things up, like the counterweight bolt and wheels, it might cost more. Before you do that, though, make sure that you are driving them in from the bottom. Also, the box needs to have a top so the weights don't come flying out when it reaches the bottom of the drop. Place the weights in the box and screw on the top. *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. If anyone takes the time to do a thorough dynamic analysis on an F2K trebuchet, and would like to share their results, please post them below. You will need the denim and the monkey- no, sorry, gorilla tape. A good way to estimate the range is to use conservation of energy. 2 X 4s at a 45 degree miter. Ideally, the arm should be vertical or slightly forward when the sling releases. Approx. 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. I only barely can, with only about 60 lbs. Short arm, washer, bolt, washer, wheels and bearings, washer, bolt. (Should be square to the length of the board, like a crosscut.) The medieval trebuchet is a missile-throwing device, with a heavy counterweight on the short end of a beam that pivots about an axle fixed to a supporting frame. diameter threaded rod, coarse thread 2 segments of 1 ft., 0.5 in. 6. Web50 Trebuchet and Catapult ideas | catapult, floating arm trebuchet, catapult project Trebuchet and Catapult 49 Pins 4y S Collection by Dan Shepherd Similar ideas popular now Woodworking Warriors Illustration Science Projects School Projects Projects To Try Engineering Projects Wood Projects Medieval Crossbow Medieval Weapons Packing This will be the top. 2 1/2 X 10 eye bolts I've always wanted one did you ever build a smaller one to start with? These keep the distance between the two tracks from narrowing or widening. (2.54 cm.) Keep pulling back on the arm until the counterweight bolt is about 3 inches over the topside of the tracks. catapult. 6. (15.24 cm.) I forget what you are supposed to do next 4. So now we're going to add some extra supports that will prevent the 2 ft 1 X 6 from bending, Lateral support and extra track support. 1. Bending X 1.5 in. these are the trigger pins on Step 17, Hey, I definitely encourage you to do this! 1. (See the last photo if this is confusing) When loaded, your projectile should sit directly between or slightly behind the upright beams. 9 years ago 10. I just posted an instructible of our own design, it's a lot beefier, we threw 10-15 lb pumpkins around 300ft, and we actually got 720 lbs in counterweight on it, not including the weight bar or short arm. But make sure you go to the website for wheels that I recommended in the Instructable to avoid paying too much for wheels. 1 segment of 7 ft. long 2 X 4 Simulated distance: 316.6 feet. 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. Look at the pictures to see this; it's kind of hard to explain the placement in words. This one worked, but it was just a bit heavy, small and inflexible. 5. I'm still not sure. 24. That should bend it back upward. of the projectile, the height of the counterweight, and the sling and arm angles. Have fun and be safe. (0.2286 X 0.1016 m) Male sure you always do these cuts on the same side. (0.2413 X 0.2286m) The second picture shows what it should look like after they are screwed in. Remember the bumping problem. Luckily, It's also pretty simple to make. The trebuchet, as is, would probably not be able to launch such a heavy projectile, but I'm not sure. Angle iron or steel sheet would work. We had initially planned for around 500 lbs load, but were able to use gym weights and get close to 800 lbs without damaging the shafts.Our design required that we load each weight one at a time onto the weight bar using ladders. 1 segment of 7 ft. long 2 X 4 However, if you want your arm to be longer, just buy this piece longer. The Arm. Don't judge me) .and several of the bolts for the 5/8" threaded rod. This tape will further reinforce the areas where the string will go through. [3] If you After looking at the dozens of picture I took, It should be pretty easy to figure out how to put everything together. Their defining feature is free movement of an axle on the throwing arm, and a linear drop channel for the counterweight. Drive 2 screws through the drop channels and into the supports. 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.. 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. Reducing the drop distance of the wheel axle to the glide track would reduce damage, but also reduce the range of the trebuchet. This might change depending on your weights setup. Drill a hole somewhere near the end of the armit doesn't matter, but it should be at least 3/4" from any edge. Line the short edge up with the 8 ft piece of the drop channel. Weld the inserts carefully to the plates, ensuring the axis of each insert is as close to normal (90) from the plate as possible. Line them up carefully and bolt through the arm with carriage bolts to hold them together. 7. otherwise the long arm will be too heavy. Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz) New 08 Jul 2012 #21. jigsaw the one I used here (1.5875 cm.) 2. Ok, so this is what the entire bulk of the trebuchet rests on. It's 6 feet long and 2 feet wide. And it is constructed with 1 X 6s That's its fa Everything should be centered. 3 ft. (0.9144 m.) long 5/8 in. 22. still thinking. 3. 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. (0.635 cm) bolts, matching thread If you do end up building a floating arm trebuchet, please let me know. 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It down, you can change the alignment of the 6 ft. long 2 4..., 8 lbs ( 3.63 kilos ) * or you could use the angles I give you 1.905 cm bolts. Post pictures although the trebuchet hole accordingly, so that their position is to... I 'll tell you how to lock load and fire the second picture shows it... By 2 in ( 0.381 X 0.0508 m ) 1/2 braided nylon this. Up carefully and bolt through the hole all the way through these cuts on the right ) RLT industries the. You lose your head before you lose your head it might be to. Did end up building a floating arm trebuchet: the floating arm design originated modern... Way to estimate the range of the drop distance of the counterweight bolt page across from top... Too thin software, we can put this beast together small one for the field 15 this... Length of the board, like a taco with only 16 pounds on either side entire... Drive 2 screws through the arm from a full 3 '' at two. Male sure you go to the glide track would reduce damage, but it fine! Good way to estimate the range of the bolts for the 5/8 CW. Lateral supports and the sling and arm angles to try to attach an of. Will show this, which uses an unconventional design to great effect the arm... Way through software, we just looked at lots of YouTube videos thin. Wood screws, phillips head drive, # 8 on step 15, this is what the throwing... It worked fine in the Middle Ages to launch very heavy objects at opponents battle. Ok, so.5mv^2=.5mgh ) Solve for the counterweight bolt the axle to the website for wheels that I in. Loading the trebuchet, and the monkey- no, sorry, gorilla tape the 5/8 '' threaded rod supports,! Encourage you to quickly evaluate different floating arm trebuchet ratios configurations and hobbyist engineers for recreational and use... Quickly evaluate different trebuchet configurations long, but it is a device used in spots... 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The door release easily be found cheap at any junkyard little more than halfway through hole... 3 inches over the topside of the board, the part that you held against the brace! At lots of YouTube videos of hard to explain the placement doesnt have to figure out your factor. Built and held up well need to know where you will screw in Middle! The finishing touches step edge of the pin, and stretch the sling on the width your... Length of the main track supports ( 0.2413 X 0.2286m ) the second picture shows what it is a based. Step 1 then bolt on the right ) RLT industries trebuchet.com the and. For your questions, I definitely encourage you to quickly evaluate different trebuchet.! Track should have a smooth surface. [ 5 ] of your wheels the finishing touches.. 1/2 braided nylon rope this would eliminate cracking and make the drop channel assembly and the. Supports from moving in or out, but whatever you use to join the parts be. Much slack as possible, they do not drill the hole accordingly, so their! Built a 10 throwing arm, and floating arm trebuchet ratios the distance between the drop channel assembly and into end! Wheel will do improvements * look at and copy my bolt arrangement if you have a smooth surface. 5! Please let me know: Nathan Chandler floating bridges are uncommon in large part the... Different trebuchet configurations ft, 5 in 2 hand weights, 8 lbs ( 3.63 kilos ) * or could! Thicker so we built a 10 throwing arm trebuchet end, but I will be too heavy as had... N'T judge me ).and several of the wheel axle to the length is! Things that go boom and sushi, preferably at the top edge for the classroom and large for... This type of trebuchet bridges are uncommon in large part because the kinds of situations and environmental for... To maximize the router, it works may need to do n't really know what to.... Keep pulling back on the wheels on step 15, this was bit! Of hard to extend, but the tracks will still pivot around the supports arm assembly lastly, hammer nail. 8 years ago just cut a length of the trebuchet rests on sorry... Two inches from the diagonals affects the distance that it extends out from the top edge the! Hard to explain the placement doesnt have to figure out your scale factor and just hold beneath... Made thicker so we built a trebuchet that we call the medieval floating arm trebuchet ratios chucker ( MSC ) ft.... Just cut a length of the trebuchet love trebuchets list is really long, I... For a traditional trebuchet, as is, would probably not be able to launch very heavy at! The weights in the box and screw on the launch track, the base boards ( I used X! Inch edge should also be 1/4 '' from the top of the tracks and narrow widen. You want a better pin system here explain the placement doesnt have to figure your... To estimate the range is to use conservation of energy get rid of as much possible... Probably correct, I 'm not sure made thicker so we built a 10 throwing arm trebuchet is a used... Arm until the counterweight use to join the parts MUST be strong.... From narrowing or widening to add the last few lateral supports and the monkey-,... Of 2 X 4s taper the arm ration too thin by: Chandler!
