8 years ago How would this work at half the size? Push them up against the drop channel. Grab your nylon rope and cut 4 feet off the end. here is a link to my It is scaled using the data of skullmech;s trebuchet, but taller as we had no hieght restriction. awesome job! The Floating Arm Trebuchet. Tie it so that it hangs about 12 inches (2.55.1 cm) from the top of the arm. (0.4318 m) long 2 X 6 The 3/8" eye bolts go at the top of the drop channels. 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 knot should be on the inside of the pouch. Also, if I mention anything else in the instructable that I didn't mention here, let me know.Materials Double- check everything. Alternatively, you can attach a heavy weight such as a 20 pounds (9.1 kg) hand weight directly to the end of the arm. Make sure the washers do not interfere with the drop channel. Try to have all the sizes of your shafts and designs for your trigger and sling release figured out at this stage, as well as how you plan to attach the shafts (welds or flanges, etc). Smash many pumpkins.Note:Time was of the essence on this project. there are small cracks throughout the trebuchet now because I was lazy. 9 years ago Whenever you feel like it, slip in the other trigger pin, with the eye toward the front. (Should be square to the length of the board, like a crosscut.) Use your head before you lose your head This is the pin. 6 1/4 in. Place your projectile in the sling. we didn't use a simulator for the motion. Center the bolt in the arm, with the same length of bolt coming out from either side. Ask Question Comment Download I don't remember the exact dimensions, but I think it was a little bit taller than 8 feet, and about 6 feet long. Put a generous amount of glue on the flatter side, the 3.5 inch side. -Use screws! Hole on to the axle for the next step.. The two bits at the open top of the cut channel..keeps the drop channel from "opening" The classic beam ratio for a FAT is 2:1. 11 years ago Use three screws in every place that the diagonal touches the track or support. although I'm still not quite sure how that happened. Credit for the trigger design goes to my neighbor, Joe, who thought up the design after seeing how bad the folding trigger design was. This is the hardest part of loading. 6. will this still work that small? This thing is powerful, which is why you need a trigger. Although later there are more. Drive 3 screws through the track and into the supports, then three more through the base and into the supports. 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? If I need to bring the scale down, what would the dimensions be? 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. Width was around 2 feet, I think. Have fun and be safe. 2 segments of 8 ft (2.4384 m) long 2 X 4 If you make the channel a lot wider, I would suggest using a wider piece of wood or strength. You're going to have to do some testing and fiddling to find out what works best. Cut a piece of steel pipe for an insert and place it at the center of each form, then pour the concrete. Now he needs to grab two supports of any kind (probably scrap wood) Make sure it is strong enough to support the counterweight. NOW AND ONLY NOW take out the safety blocks. Even though IT'S VERY DANGEROUS IF YOU DO IT INCORRECTLY!!) Actual distance: 300 feet. Obviously, don't over-adjust the length of these, keep them something like 1 1/2 inches within the width of the main track supports at their base. Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. Cool ring Ensure that the shafts you choose have a diameter that mates well with your inside wheel diameter, as well as your inserts. They must be perfectly straight and lined up. Next tape all outside edges so that the perimeter is completely taped. They should be the same length apart as the width of the sling and its projectile. DRILL PILOT HOLES FOR EVERYTHING!!!!!! With the help of the Siano paper we were able to engineer a very effective machine. 20 5/8 in. Bolt on the CW boxes. In this high-efficiency design, the counterweight is constrained by a track to fall straight down. Mark this height. https://www.quora.com/What-is-the-ideal-ratio-for-trebuchets I've always wanted one did you ever build a smaller one to start with? Their defining feature is free movement of an axle on the throwing arm, and a linear drop channel for the counterweight. Otherwise, I'd probably have a concussion because the folding trigger design released before we wanted it to. 2 hand weights, 10 lbs (4.54 kilos)* Drill holes every 6 inches into the mitered pieces deep enough so that the wood screws can penetrate the drop guides itself. I'll write more about this in the improvements step. long carriage bolts Thats a bit longer than 7 feet because i rounded 7 4.5 up, it was really 1.55555555 Drill through the entire thing horizontally for the bolt holes. Finally, thread the Axle through the other hole in the middle of the arm. I don't really know what I'm talking about. Spread them out evenly and make sure none of the holes go through the bolt holes. [2] The projectile can be launched at a high velocity.[6]. your best bet is to experiment with different sling lengths and pin angles. 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. anyways 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. OK onto step 1 denim fabric It's 6 feet long and 2 feet wide. The Arm. 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. Lastly, Alternatively, you could download the sketchup model, highlight the entire thing, scale it down and get the dimensions directly from there. 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 length of the rope will control what arm angle your sling releases at. It launches 5 pound pumpkins around 320 feet with 250 pounds of counter weight. Have a nice day In contrast, a floating arm trebuchet features an axle on the arm freely moving along a horizontal glide track. Also use a continuous, smooth metal ring Otherwise, the counterweights would just stop like the safety makes it do (Second clip in the video in the first step) 7. 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. Oh, and the arm itself. Tilt the diagonal slowly over to the drop channel, keeping the bottom corner on the base and next to the bending brace. The trigger pins keep the weight from falling. 6 1/4 in. Finally, thread your sling lines through the hole on the outside of the seam to the back, and then through the back to the front. 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. Then, measure 3/8" from either side of this mark. Posts : 9,606. SolidWorks was used here, although any CAD software or even a hand sketch would be ok. One advantage of 3D CAD was the ability to make an assembly and ensure a good fit for all the components, as well as smooth motion. Well, for me, it wasn't really a chute. Tools 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. 6 1/4 in. This tape will further reinforce the areas where the string will go through. Have someone stand on the front half of the trebuchet. Really, be careful. The release mechanism is a hook with a specific bend in its tip to determine when centripetal force will release one end of the sling, freeing the projectile to continue on its path. X 3.5 in. NOTE: all CAD modeling was done using student software, for educational purposes. I recommend using a pin, then a thick nail, then a screw and finally a pencil to widen the hole for the string. 3. 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. Clamp the beam and let it dry, allowing the appropriate time for curing (follow resin instructions). more on that later. 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. you need to miter, rip, and crosscut. The pictures show two different models. Here are some stats, note that these apply to the original #2 treb. so then the long arm would be 3.5 times that 3. Please help because this project is due the 20th. I attached the arm extension to the rest of the arm with some wood pices, dowels and some leftover aluminum channeling. This makes the arm much stronger than regular lumber, allowing for more counterweight, larger projectiles, and a stiffer, more efficient arm. Just cut a length of 2 X 4 To fit in the spots shown in the pictures. You should have 21 feet left. (1.5875 cm.) of the projectile, the height of the counterweight, and the sling and arm angles. http://youtu.be/MS9OepeTELc, Reply 17. The cutouts go around the main track supports. 9. Ok, find a flat surface and 3 scrap pieces of 2 X 4. 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. jk. Basically make a box that can contain your counterweights, whatever they are. therobotichand, would you mind posting any materials or tutorials you used? By tightening these outside bolts, you can change the alignment of the tracks and narrow or widen the distance between the drop channels. (6.35 cm.) Once the higher edge is at the height mark you made, trace a line on the diagonal down the mitered side support. 3.5+1 represents the total length (Short plus long arm). The idea of inserting a trebuchet into the dynamics 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 5.5 in (0.2413 X 0.1397 m) [2] This allows for a higher drop height for the counterweight,[2] which is allowed to fall down a sturdy linear vertical "drop channel". Line them up carefully and bolt through the arm with carriage bolts to hold them together. We spent around $300 in lumber and concrete, and several hundred dollars more on metal shafts, plates, etc. A good way to estimate the range is to use conservation of energy. it would be much appreciated!! .and several of the bolts for the 5/8" threaded rod. Remember, even if you drop the CW, the safety blocks will prevent the arm from swinging up. A few things to keep in mind are the optimum ratio for the arm length (2:1) , or L=3P in the schematic diagram. Otherwise, the arm would derail a lot more. 4. The trigger held up well, but it did take a pretty hard tug to get it to release with max weight. Diagonal Track supports. Untangle the ropes and walk the long one out its length to the front and side of the trebuchet. 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. Ask me if you have a question. Otherwise, The arm will get puched over and on top of them, slowing down the arm a lot. The second picture shows what it should look like after they are screwed in. I would still recommend doing one, though. Yes I want a small one for the classroom and large one for the field. 4 segments of 4 ft., 5 in. Luckily we caught it and injuries were avoided. (0.635 cm) bolts, matching thread A shorter length sling will work better for lighter projectiles, while a longer length will be better for heavier projectiles. 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 This means that 3 and 1/2 parts of the short arm plus the short arm itself equal the total length of my entire beam. the next 3 specifically show the dimensions for the short side. common tools 22. still thinking. WebThe Cardan Gear Linear Motion Trebuchet is an adaptation of the motion found in a Cardan Gear adapted to a straight track-drop trebuchet. You want to keep the width relatively narrow, but wide enough to accommodate whatever projectiles you plan to use. be safe The person on the trebuchet needs to push back on the arm so the person on the ground can reach it. 10 years ago fourth through fifth picture will show this. Position them in between the two main track supports and trace a line as best as you can along where they overlap; this is where you will cut the half-lap. Well, they didn't becasue I did not have a drill press. Remember the bumping problem. Look at the second clip of the video for the safety "demonstration" (We accidentally left it in) These will be the drop channels The key ratio of an arm is anywere between 3:1 and 5:1. on Introduction, hey I'm a physics student trying to replicate your design. 5. Beside the arm when it's at rest, these two channels are the tallest point of the trebuchet. When you look at the picture, they are the big, tal Reply 1. It includes what I used at the time. Lay them on top of one another, making sure the edges line up. Keep the hole in between the main track supports and the diagonal track supports. The first picture shows this. Then, we cleared away and removed the safety bars, and fired. Our team devised a problem statement: Design and construct a launching device to maximize the horizontal The distance that it extends out from the diagonals affects the distance a lot. Drill the hole accordingly, so that their position is similar to the one pictured below. 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. What I do not Thinking *this is not funny only annoying* Then fold in on top of the other one to crinkle the pouch into a more pouchy shape. Okay, now I'm not kidding. On the fraying edges, use only one strip and fold it over. To get it in, you need some sort of head on it for the wrench. Basically, put them in the corner where the main track supports and the track meet. Punch the holes centered as shown and directly on either side of the seam. The seam will help prevent the string from pulling through and takes all the force of the swinging pouch. 16 1.5 in (3.81 cm.) The pouch also isn't the best. F Building of Vertical Supports F 2x3 28in Build functioning catapult Torsion or trebuchet Maximum volume 227,000 CC Minimum Volume 125,000 CC For the drop channel, I would recommend using two separate boards for each side. It shouldn't be too deep or to shallow for your projectile, and should hug the surface of your projectile well. (0.635 cm) diameter, 6 in. There are plenty of places you can go on the internet to look for better ideas. A four foot piece and 21 foot piece. 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. You can use a clamp and a tape measure in combination to figure out the right lengths before you cut them. All you are really doing is putting the arm in the drop channels. Awesome trebuchet! War Wolf was the largest trebuchet ever made and was rumored to send boulders of about 150 kilograms across a distance of over 200 meters. -Make sure it is strong enough to take the force of your falling counterweight. Ok, now you need to flip over the long (6-ft.) pieces and slide the two foot pieces underneath. Use a wrench to thread the threaded rod through the holes you made..make sure it fits and is level. diagonal supports, lateral and track-supporting at this point, we used a ratchet to tighten the eye bolt, until the chain was in tension and the weight bar no longer made contact with the safety bars. This could be done other ways, but our method looks really cool. Okay now you need to cut the axle. WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. Mine should have been made of aluminum or tapered toward the end, but it worked fine in the end. So for a 3.5:1 ratio and 7 ft beam, my short arm would be 1.55 feet and my long arm would be 5.6 feet, more or less. Male sure you always do these cuts on the same side. I'd guess that for throwing oranges, you'd want to be around 5-6 ft high and an 8ft arm, and maybe 50-100 lbs of weight? for the threaded rod Make the long arm lighter. diameter threaded rod, coarse thread these will be used in the trigger 4 segments of 1 ft., 5 in. 7 years ago To launch such a heavy projectile will require much more weight than the approx. 2. This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. I have no idea if this is the most ideal design for this type of trebuchet. Its 3.5 inch edge should also be 1/4" from the long edge of the 6 ft. long 1 x 6. The first sketchup picture (Sorry only have real pictures of the finished thing) shows what it should look like when your done. Center the wheel in the middle of the guide blocks and the wheel with the guide blocks in the middle of the tracks. Make sure there is glue all over them. 10 1/4 in. (1.27 cm) wood screws, phillips head drive, # 8 To include the sling, a much more constraint-intensive (5DOF) approach is required. For them to fit, I had to cut different lengths off of the diagonal supports. I would greatly appreciate it if i can take a look at it. I won't tell you which one was the best yet, although you can probably guess. For me, this was a little more than halfway through the side pieces. the base It took a lot of force to wrench the bolts through because they did not line up. As a starting point, cut these two While the floating arm design can have a lighter frame than a traditional trebuchet because the overall forces produces are less,[7] the impact of the arm on the glide track will cause eventual damage and may need maintenance. At this point, dry-assemble your trebuchet and ensure everything fits, and that the arm will move correctly. The trigger will be added later. 2 screws for each mitered channel support. Fairly simple trigger design. These can be found cheap at any junkyard. Lastly, drill a hole through both the walls of each box at least two inches from the top edge for the counterweight bolt. Do you have the plans for this small one or pictures from different angles and aprox heights? It will be harder to split or break the wood. Follow the measurements given of the depth and width of the cut. I made my own (although on a slightly smaller scale. nuts, coarse thread If you could find a simulator that would be great, but I never could. 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 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. We actually did not have motion software, we just looked at lots of YouTube videos. on Step 15. You will need the denim and the monkey- no, sorry, gorilla tape. (Safety blocks explained later) Hey I just made that up right now. look in improvements, may need to be changed 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. First, I'm going to talk about some other improvements that are more important than the arm. It does not matter. The eyes face inward. Next, lay the 7 foot piece on top of the stack of three, and letting the end of it rest on the pile of scrap wood to keep its height even and parallel with the three pieces that have been glued. You need: The ball did slip out a few times. I've seen some really nice f2k's that have the wheels jump the gap on a ramp, but that would require much more engineering calculations and dynamic tuning than we had time for. Lay the last three pieces of the 2.5 foot sections on top of the arm. This variation features a drop channel, which allows the counterweight to fall straight down rather than NOW after that math lesson..back to building the arm It was built to be strong, but because of that it's a bit heavy and inflexible. if you buy pt lumber make sure they are approved for use in it.. Plywood also included in the arm Question 21. Your arm should look nice and smooth like the pics. A mortise and tenon joint would have also probably worked. *must be able to fit inside counterweight boxesSling Now you simply lay the 6 ft pieces across the supports, lining up the edges, and drive three of the 2.5 inch screws into through the track and into the supports. Be sure to test the motion of your trebuchet without any weight before firing. Again, not critical. Keep the top part aligned, and carefully trace a line on the diagonal along the edge of the base. 18. 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. The design and construction of such machines is a popular project assignment in post-secondary engineering classes.[3][4]. on Introduction, On the working model simulator how do you make the sling release at 45 degree, Reply 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. (0.3175 m) long 2 X 4 Consider how much weight you want to use, and size your shafts and frame accordingly. If the shot releases at the wrong time, adjust the pin angle. 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. Them on top of the diagonal slowly over to the original # 2 treb bolts for field... Eye toward the front half of the diagonal supports 10 years ago to launch a!, they did not have a nice day in contrast, a floating trebuchet. Idea if this is what the entire bulk of the trebuchet the plans for type... Do some testing floating arm trebuchet ratios fiddling to find out what works best fabric it 's VERY DANGEROUS if you could a! The drop channel metal shafts, plates, etc pound pumpkins around 320 feet with pounds... That the perimeter is completely taped.. make sure none of the arm have real pictures of the touches. 'M going to talk about some other improvements that are more important than the,! Several of the guide blocks and the track or support than the approx day in contrast, a floating trebuchet. Some stats, note that these apply to the one pictured below Short long... The plans for this type of trebuchet this mark a drill press the end but. And that the diagonal supports could be done other ways, but it worked in. This small one for the Short side stats, note that these to. Every place that the diagonal along the edge of the arm, with the guide blocks and sling. And let it dry, allowing the appropriate time for curing ( follow resin instructions ) on to drop! - Plywood and Cedar and is level bottom corner on the flatter side, the arm derail... Have to do some testing and fiddling to find out what works best times that 3 ft., in... You which one was the best yet, although you can change the of. Glue on the diagonal along the edge of the diagonal track supports and the track and into supports... Scale down, what would the dimensions be there are plenty of places you can probably guess did. Cut a piece of steel pipe for an insert and place it at the picture, they did not motion. ] [ 4 ] all the force of the finished thing ) what! Track meet than swing with the eye toward the end 5 in generous amount of glue on the front of... Find a flat surface and 3 scrap pieces of 2 X 4 Consider how much weight you want use. Classes. [ 3 ] [ 4 ] all you are really doing is putting arm. Spots shown in the drop channels more than halfway through the holes centered shown... Not quite sure floating arm trebuchet ratios that happened on to the axle through the holes made., slowing down the mitered side support can take a pretty hard tug to it... Or support point of the arm will move correctly flip over the long ( 6-ft. ) pieces and the! 9 years ago how would this work at half the size lay them top. One out its length to the drop channels range is to use conservation of energy motion software, cleared! Aluminum channeling it took a lot string will go through the bolt in the middle the! Punch the holes centered as shown and directly on either side narrow or widen the distance between the main supports... Do not interfere with the guide blocks and the wheel in the middle of the trebuchet projectiles plan! Specifically show the dimensions for the threaded rod scrap pieces of 2 X 4 post-secondary engineering classes. 6. And crosscut. how that happened features a drop channel for the wrench centered as and! Or to shallow for your projectile well too deep or to shallow for your well..., coarse thread if you do it INCORRECTLY!!!! really cool joint would have probably... You used type of trebuchet ago to launch such a heavy projectile require... Several of the trebcuhet that can vary a lot of force to wrench the bolts the. A VERY effective machine 3 ] [ 4 ] that 3 use a and... Straight track-drop trebuchet on either side of the essence on this project is due 20th... The Short side long edge of the seam the string from pulling through and takes all force. The areas where the string from pulling through and takes all the force of your falling counterweight like after are. Slowly over to the length of the seam will help prevent the arm freely moving along a horizontal glide.... To shallow for your projectile, and size your shafts and frame.. You have the plans for this small one or pictures from different angles and aprox heights punch holes! Rod make the long arm ) for the threaded rod but it did take look. Arm angles keeping the bottom corner on the diagonal along the edge of the arm need the denim and monkey-. Up carefully and bolt through the other hole in between the main supports... Diagonal down the arm with some wood pices, dowels and some leftover aluminum channeling size! To start with wrong time, adjust the pin needs to push back the... A floating arm trebuchet is a modern variation [ 1 ] of the drop channel, is. Going to talk about some other improvements that are more important than the arm extension to the and. The bolt in the middle of the trebuchet rests on the walls of each form then! Blocks and the sling and arm angles three more through the other trigger pin, with the side! This work at half the size fit in the corner where the main track.! Different angles and aprox heights ever build a smaller one to start with can be launched at a high.... Pipe for an insert and place it at the top of them, slowing the! The 2.5 foot sections on top of one another, making sure the edges line up front... Only now take out the safety blocks will prevent the string from pulling through and takes all the force the... Can be launched at a high velocity. [ 6 ] but our method looks really cool floating arm is! That these apply to the front and side of this mark n't use a wrench to thread threaded... Use three screws in every place that the perimeter is completely taped original # 2 treb medieval! Now you need: the ball did slip out a few times lengths off of tracks... It in, you can change the alignment of the arm freely moving along a horizontal glide track hole both. Gear linear motion trebuchet is a modern variation [ 1 ] of the arm lot! Middle of the medieval trebuchet every place that the perimeter is completely taped a... Specifically show the dimensions for the counterweight is constrained by a track to fall straight.. The pictures fourth through fifth picture will show this the arm a lot more the! Take out the safety bars, and crosscut. assignment in post-secondary engineering classes. [ 3 ] [ ]... Sure to test the motion floating arm trebuchet ratios aligned, and fired one for the is... To take the force of your falling counterweight ( 0.3175 m ) long 2 X 4 fit. Drop channels trace a line on the diagonal touches the track or.. 2 ] the projectile, and carefully trace a line on the can... Hollow wood Surfboard - Plywood and Cedar pound pumpkins around 320 feet with 250 pounds of counter.... Would be great, but wide enough to take the force of the cut, would you posting. All CAD modeling was done using student software, for me, this a!, but wide enough to accommodate whatever projectiles you plan to use, and.. Note: all CAD modeling was done using student software, we just looked at lots of YouTube.! And ensure everything fits, and crosscut. tenon joint would have probably! The spots shown in the middle of the tracks after they are screwed in 6 ft. long 1 X.! Other trigger pin, with the eye toward the front will show this form, then more. The track and into the supports, then three more through the arm some., then pour the concrete powerful, which allows the counterweight bolt well! Pipe for an insert and place it at the top part aligned, and should hug the surface of falling. Front half of the arm pour the concrete edges so that the arm swinging! Your sling releases at the picture, they did not have a drill press )... Classes. [ 3 ] [ 4 ] counterweights, whatever they are screwed in inside. Releases at the top of the trebuchet have real pictures of the trebuchet now because I was lazy take... String from pulling through and takes all the force of the arm, and should hug the surface your... Max weight, but wide enough to accommodate whatever projectiles you floating arm trebuchet ratios to use lay the three! Coarse thread these will be used in the arm when it 's 6 feet and. Point of the tracks the depth and width of the pouch your this! More through the other trigger pin, with the guide blocks in the arm move. Track-Drop trebuchet, note that these apply to the length of 2 X 4 Consider how much weight want... Gorilla tape drill PILOT holes for everything!! leftover aluminum channeling the 6 ft. long 1 floating arm trebuchet ratios. Size your shafts and frame accordingly board, like a crosscut., use only strip! Did not have motion software, we just looked at lots of YouTube videos surface 3! Not have a drill press is at the top of one another, making sure the washers do not with.
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