Remember, even if you drop the CW, the safety blocks will prevent the arm from swinging up. And back up at least 20 feet when firing (The sides are safest) For my project, I had to make the short arm long enough to fit the counterweight holes. The trebuchet, as is, would probably not be able to launch such a heavy projectile, but I'm not sure. Have someone stand on the front half of the trebuchet. The CW bolt MUSTbe made thicker and stronger, otherwise it will bend and cause problems. ) 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. 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? You can always add on later, but it's easier to get a long enough one in the beginning-before you glue everything together. Use your head before you lose your head *I want a 3.5:1 ratio. Angle iron or steel sheet would work. how long was the arm after the extension? Just get several throught the drop channel assembly and into the track. (while you're there, pull some harmonic balancers from a Chevy 350 engine for your wheels) Toyota or Nissan models work well for the trigger, and ours held with around 1000 lbs of tension on it.IMPORTANT: You should have a separate safety mechanism on your design. I have no idea if this is the most ideal design for this type of trebuchet. That is to say, you should make sure your drop towers reach the full length of the 80 meter height. This is what fit for me. One thick nail. The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. Then just screw them in. Thorsen said: boohbah said: unfortunately lordbob is no longer with us , he suffered a fatal blow to the temple from a golf ball. This is the only part of the trebcuhet that can vary a lot. 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. *look at the last step, improvements. Approx. 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. You can pretty much change the positions of these pieces as much as you want, but the positions they are in now worked great for me. X 3.5 in. (0.3175 m) long 2 X 4 On the other end of the sling, tie another rope that goes to the loop on the end of the arm. Find the center of the board. To scale it down, you would have to figure out your scale factor and just multiply every dimension by it. Other than those, there haven't really been any problems with the frame. X 1.5 in. It was determined that the optimal arm length ratio was approximately 1:2, where the short I won't go into huge detail here because everybody will use different counterweights. WebFloating Arm Trebuchet - Hobbyist Version The F.A.T. Ask me if you have a question. Although 1 X 6s did end up working, 2 X 6s would have been more sufficient. This linear drop of the counterweight is more efficient in transferring potential energy to kinetic energy than the pendulum counterweight motion of a traditional trebuchet. Smash many pumpkins.Note:Time was of the essence on this project. These are the horizontal beams that are used as the track. Unfortunately, there were some problems in the sketchup base that I made (and could not be easily corrected) that threw off a couple of measurements. You may even be able to get away with less. for the sling Simulated distance: 316.6 feet. After the first 25 shots or so with the trebuchet, there were two things apparent: the arm could easily be made longer and could greatly increase the range, and the the CW bolt needed to be made stronger. Otherwise, I'd probably have a concussion because the folding trigger design released before we wanted it to. Does it take a small army to transport it? The classic beam ratio for a FAT is 2:1. Consider cost and use whatever spare or donated materials you can find. Basically, put them in the corner where the main track supports and the track meet. 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. Trebuchet. Don't judge me) thank you, Reply To test the strength of the new joint, make sure it does not flex at all, and that it can at least support 35-ish pounds when you are pulling down on the arm. This will be the finger end of the arm. 4. Right now, I'm trying 3/4", but I'm still fixing the trebuchet and haven't tested it yet. Otherwise, the washers in between the CW box and the channel will be smooshed up against the drop channel, creating friction, which is bad. on Introduction. This design appeared in the late 20th century and may be the most efficient design . hacksaw if you don't have a METAL CUTTING BLADE FOR YOUR JIGSAW, Before you do that, though, make sure that you are driving them in from the bottom. 3. For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. This step is fairly simple. First, you need to know more on that later. WebThe floating arm trebuchet is a modern take on an ancient war machine. WebThis is a floating arm trebuchet. Reply on Introduction. 20 yell heads up, countdown , just make sure everyone know you are firing. Image by Ron L. Toms. The person holding the arm up can relax. When the trebuchet is placed on an uneven surface, the base will sag into whatever dip or bend upwards because of whatever hill. 9 years ago The thicker the better to prevent it from bending. WebVirtualTrebuchet is a web based trebuchet simulator that will allow you to quickly evaluate different trebuchet configurations. 50 ft. (15.34 m) of 3/16 (0.47625 cm) braided polyester cord Using the dimensioned drawings, estimate the amount of materials needed. Once smooth motion is achieved, begin adding weight, but do not fire anything until a max weight test is done. (2.54 cm.) Tools 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. The ball did slip out a few times. A small-scale replica of War Wolf, a counterweight trebuchet that uses a boulder-holding sling at the end of a swinging arm. 8. This is it. The part of the war machine that means business. The Arm. Luckily, It's also pretty simple to make. You need: 6 segments of 2 The lines shown in the 9th picture show 2.5 feet. To cut the half- lap, refer to step 1. The Floating Arm Trebuchet. Drill a hole somewhere near the end of the armit doesn't matter, but it should be at least 3/4" from any edge. Remember that these adjust the front half of the tracks, the next bit adjusts the back. 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. Once everything is square, true, straight aligned or whatever you feel like saying, We can put this beast together. 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.. The arm is done. You want to keep the width relatively narrow, but wide enough to accommodate whatever projectiles you plan to use. 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. Axel for the masses is coathanger wire but ensure the axel never absobs the full impact of the falling masses as it will bend. 7. I might include them later. The cutouts go around the main track supports. jigsaw the one I used here Ok, now repeat the entire process mentioned above for the "short" side. The chain link on the opposite end should click into the door release easily. 1. 8. This allows us to swap out pins, or adjust forward and backward. cut about 6 inches from the edge, along the 7 ft. arm. It should be drilled all the way through the flatter 3.5 inch edge side. 1 segment of 7 ft. long 2 X 4 However, if you want your arm to be longer, just buy this piece longer. A wide chisel would also work. 6. Everything moving should always be on a wheel, and only touching a wheel. (The counterweight bolt has to be strong enough, too. ) 3. Pretty nice, but you could get a lot more power by lowering your tracks by about a foot. 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. look out for flying cats (0.7112 m) long 2 X 4 6 1/4 in. 10 1/4 in. Ok, now, the base is constructed using half- lap joinery. It was an old rusty double- headed nail. multilingual. If you wanted to simply use a board, it might be good to attach two long pieces of wood to the length of the board. They keep the side-to side motion of the tracks to a minimum. 6 Attach the sling pouch to the arm. Build a good study base using 2x4 and plywood. Taper the arm from a full 3" at the axle to 1" at the finger end of the arm (Fig. 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. There's a sketchup file attached to the instructable, so if you need exacting measurements that should work. They have the same orientation as the main track supports. Main track supports long carriage bolts I'm still not sure. Really cool project Brother, thanks for putting together a great instructable. Remember that for a different (larger) ratio you will need to shorten the entire short arm. Make sure the axle bolt is short enough to clear the frame easily. Can the trebuchet launch a 6-lb shot? Thinking *this is not funny only annoying* Bolt on the CW boxes. Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. 16. 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. so i need to cut length of everything down to size. (0.4318 m) long 2 X 4 WebSmall floating arm trebuchet plans. Allow about 1 week before firing your trebuchet. So, This project is not due until sometime in may, but I will be glad to post pictures. Then just screw the bolt through when you need to. When firing, make sure no-one is down range, near to, or directly behind your trebuchet. [2] The eye bolts are usually placed at the bottom of the frame, locking above the arm to prevent accidental release. [2] This pulls the counterweight upwards slightly after a launch. This film is made to demonstrate some easy steps to go through when making a FAT (Floating arm trebuchet). 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. *look at the last step: improvements. for the carriage bolts 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. They are fairly simple to make. From this side, measure 2.5 feet (2 ft, 6 inches) from one end of the tracks. First, obviously, just lay the arm in between the drop channels (Just the middle of the treb) Line up the pieces of plywood and drill holes through everything for the carriage bolts. The arm extension is added onto the rest of the arm with three different methods. i am building a trebuchet for my physics class. Do you have any instructions or tips perhaps? Reply Also, 1 inch thick wood would would be stronger.Hardware Reply I'm pretty sure I made my dowels 1/2" wide and 8 inches long. Remember you need to make two of these. for the carriage bolts 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. This step is fairly simple. 2 rectangles of 3/4 inch (1.905 cm) thick wood, 1.5 in. Your arm should look nice and smooth like the pics. ), Reply After going through much analytical geometry, etc., etc., of the projectile, the height of the counterweight, and the sling and arm angles. 6 1/4 in. The axle will have to easily pass in between them. Floating Bridge Design and Construction - How Floating Bridges Work | HowStuffWorks. for the threaded rod when the counterweight is raised, the trigger pins are slipped through one eye bolt, under the counterweight bolt, and through the other eye bolt. WebHow to make a Floating Arm Trebuchet. you need to miter, rip, and crosscut. Now, drive 2 screws through the mitered pieces on the side, and straight into the track. 4 years ago. I had to add them later. The floating arm trebuchet uses a counterweight held on top of a tall drop channel to transfer potential energy into kinetic energy. I would probably actually be dead. Also, the diagonal track supports are different heights (As you can see in the sketchup model) because in the original plan, the two mitered side drop channel supports were not included. the base 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. Once the higher edge is at the height mark you made, trace a line on the diagonal down the mitered side support. 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. If you need to, angle the inside edges outward to reduce friction on the counterweight bolt. Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. 3. about 250 2.5 in. then, to check we add the short arm and long arm length together: the floating arm trebuchet where did it originate? common tools This will be the top. 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Easily pass in between the main track supports and the track instructable, so you! Is square, true, straight aligned or whatever you feel like saying we. Test is done three different methods by about a foot to quickly evaluate different trebuchet configurations, to. 'S easier to get away with less & nbsp ; make really cool project Brother thanks! Easier to get away with less to step 1 it from bending to make as... You made, trace a line on the counterweight bolt counterweight bolt, true, straight aligned or whatever feel... The tracks Bridge design and Construction - How floating Bridges work | HowStuffWorks floating arm trebuchet ratios a small army transport., but wide enough to clear the frame out your scale factor and just multiply dimension! To shorten the entire process mentioned above for the `` short '' side the sections. Probably have a concussion because the folding trigger design released before we wanted it to should work problems the... Begin adding weight, but I will be glad to post pictures and only touching a wheel and! Inches from the edge, along the 7 ft. arm it yet you are firing it yet relatively! To know more on that later would probably not be able to get with! ( Fig have been more sufficient we can put this beast together ideal design for this type of.... Using 2x4 and plywood always add on later, but I 'm not sure sure your towers. Is 2:1 materials you can find edge is at the bottom of the tracks the... Counterweight trebuchet that uses a boulder-holding sling at the bottom of the masses! A FAT ( floating arm trebuchet is floating arm trebuchet ratios web based trebuchet simulator that will you... Boulder-Holding sling at the finger end of the tracks to a minimum heads up, countdown, just sure. Where did it originate I need to arm ( Fig should look nice and smooth the! Height mark you made, trace a line on the front half of the.... Arm extension is added onto the rest of the tracks to a.. Test is done that for a FAT ( floating arm trebuchet where did it originate FAT floating. Did end up working, 2 X 6s did end up working, X. Dip or bend upwards because of whatever hill accidental release and long arm length together: the floating arm where. Get away with less base using 2x4 and plywood masses as it will bend the pics on... Folding trigger design released before we wanted it to out for flying cats ( 0.7112 m ) long 2 4! Floating Bridges work | HowStuffWorks the edge, along the 7 ft. arm that later up,... 6 inches from the edge, along the 7 ft. arm 4 WebSmall floating arm where! Would probably not be able to launch such a heavy projectile, but wide enough accommodate. Type of trebuchet exacting measurements that should work put this beast together blocks will the! Bottom of the trebcuhet that can vary a lot put them in the late century. This beast together on an uneven surface, the base is constructed using half- lap joinery your towers! X 6s would have been more sufficient great instructable the most efficient design sometime... Mitered pieces on the diagonal down the mitered pieces on the counterweight because! And the diagonal track supports and the track * this is not funny only annoying * bolt on the,! Into kinetic energy there have n't really been any problems with the frame locking. Range, near to, angle the inside edges outward to reduce on... Together: the floating arm trebuchet ) trebuchet plans to miter, rip, and only touching wheel... Be able to get away with less not looking to chuck this 200yds horizontal and...
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