(Look at the picture) common tools Then just bolt it all upYou can look at and copy my bolt arrangement if you don't really know what to do. I would probably actually be dead. Although 1 X 6s did end up working, 2 X 6s would have been more sufficient. And do lots of testing, with a realllllly long trigger string. If not, just measure the distances on each piece as accurately as you can. You can use a clamp and a tape measure in combination to figure out the right lengths before you cut them. claw hammer Lean the supports in towards the drop channel as they go up so they don't slip out. Place the hole for the counterweight bolt about an inch and a half from the end. Make a square line across the flat side of the board. With the help of the Siano paper we were able to engineer a very effective machine. Basically, lift the weight into the air using the arm as a lever and the seam in the arm close to the fulcrum. Drill a hole horizontally and squarely directly through the track. To begin, enter the parameters of your trebuchet in 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. After going through much analytical geometry, etc., etc., Diagonal Track supports. these are the trigger pinsWheels, weights 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. (15.24 cm.) We spent around $300 in lumber and concrete, and several hundred dollars more on metal shafts, plates, etc. Smash many pumpkins.Note:Time was of the essence on this project. (2.54 cm.) Raise the CW to the top and hold it there with your thigh (raise your leg to support it) and one hand. 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. The arm wasn't too hard to extend, BUT whatever you use to join the parts MUST be strong enough. To fix this, you get a thicker CW bolt, and hopefully a hardened one. This will stop fraying and make it more solid. The cutouts go around the main track supports. hacksaw if you don't have a METAL CUTTING BLADE FOR YOUR JIGSAW, It was determined that the optimal arm length ratio was approximately 1:2, where the short Once they are pulled, they do not interfere with the motion of the arm. Hey Chans2901, Thanks for your questions, I love trebuchets! So, This project is not due until sometime in may, but I will be glad to post pictures. Ensure that the tension will be applied in a direction that is similar to the way it is intended to be used in a car door. First, obviously, just lay the arm in between the drop channels (Just the middle of the treb) I will be modeling my trebuchet after your and would like to know Can the trebuchet launch a 2-lb dumbell? (I had no idea what else to finish it off with. 1/4" at the very most. I really appreciate your work in building this instructable. Phsstpok's rule works well in determining the BR, maybe better than with HCWs. 8. -Use screws! Cut the threads off of the long eye bolts. [2] The difference in the lengths of the two ends of the arm provides mechanical advantage. While this is happening, the wheel is moved backwards by the torque acting on the arm from the counterweight. The trigger is a fairly simple design. Finally, tie the keychain ring to the slightly shorter rope. To cut the tracks, mark a 3/4" gap that is aligned with the drop channel gap and the support directly below. 3. 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. (0.889 m) long 2 X 6 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 It does not matter. anyways, the trigger design is fine, but whatever design you use, make sure it won't accidentally slip. 19. And lastly, for the extra supports, we have the lateral diagonal supports. 1. From this side, measure 2.5 feet (2 ft, 6 inches) from one end of the tracks. Remember to shorten the short arm pieces if you are using a larger ratio that will need to make it shorter. on Step 15. The distance that it extends out from the diagonals affects the distance a lot. The pouch also isn't the best. OK onto step 1 Webi'm working on a quick sketch for a floating arm trebuchet i'm making in an engineering class and need help selecting and using the correct mate tool in the on shape assembly tool. This will take some effort. *I want a 3.5:1 ratio. thick wood, 2 ft., 5 in. In this high-efficiency design, the counterweight is constrained by a track to fall straight down. SECOND PROBLEM The arm can be longer than your sheet of wood, but make sure the gaps between the pieces are in different spots for each layer. I like things that go boom and sushi, preferably at the same time. Don't judge me) Use a washer wherever metal is coming in contact with wood. (0.635 cm) diameter, 6 in. ), but I came up with distances reasonably close to the actual performance. About: Mechanical Engineer in the machine design industry. If the shot releases at the wrong time, adjust the pin angle. 2. 6. This could be done other ways, but our method looks really cool. 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. Does it take a small army to transport it? [2] This allows for a higher drop height for the counterweight,[2] which is allowed to fall down a sturdy linear vertical "drop channel". They flexed a lot and caused several problems when I was building the trebuchet. To cut the half- lap, refer to step 1. the next 3 specifically show the dimensions for the short side. [2] The eye bolts are usually placed at the bottom of the frame, locking above the arm to prevent accidental release. Add a little lube to the linkage and the clamp itself if needed. (1.5875 cm.) Here's some vid of ours. on Step 17, Hey, I definitely encourage you to do this! On the end of the arm, there will also be a nail, or some sort of strong metal pin. WebSmall floating arm trebuchet plans. awesome job! *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. more on that later. Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. http://youtu.be/MS9OepeTELc, Reply Now, let's get started actually building and attaching them. It would be better if both ends were one solid piece of wood. [9] These machines and their designers are frequently to be found competing in various recreational events, for example, pumpkin chucking contests.[10][11][12]. 16 1.5 in (3.81 cm.) The Cardan gear was invented to accept linear motion from a steam piston to create circular motion. 7 years ago. *look at the last step, improvements. anyways 9 years ago The Floating Arm Trebuchet The trebuchet is a medieval gravity powered engine of siege warfare designed to hurl a projectile, such as a heavy stone or a diseased animal, at a distant target such as castles. NOW AND ONLY NOW take out the safety blocks. Plywood also included in the arm This is what fit for me. If you really want to include them, they should also be cut about 3 inches longer, until you know what to cut. *It would be better if the two previous 1 X 6 pieces were 2 X 6, I'll explain later. 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. Beside the arm when it's at rest, these two channels are the tallest point of the trebuchet. I used a projectile motion program I wrote using Matlab last year, and assumed a release angle of 45 and initial height of 15 ft. So I'm still not sure if i should add it. I've definitely seen some trebuchets in that size range throwing tennis balls, 6" steel shot, etc very far. The pin is made of all thread, 1 ft long, with the threads on the end ground off. Lengths Lengths Angles Masses Density Copyright 2013, Eric Constans and Rowan University On the arm, drill a hole for an eye bolt, and use a washer on both ends. They're probably correct, I'm just letting you know. I lined up the holes with the dowels and hammered home. Ensure that the shafts you choose have a diameter that mates well with your inside wheel diameter, as well as your inserts. Finally, thread the Axle through the other hole in the middle of the arm. Long sides of the base 5. (See the last photo if this is confusing) When loaded, your projectile should sit directly between or slightly behind the upright beams. The CW boxes tilted, and would rub on the drop channel when it dropped. All you are really doing is putting the arm in the drop channels. I speak Spanish and English, along with English and Spanish. This design appeared in the late 20th century and may be the most efficient design . Look at the second clip of the video for the safety "demonstration" (We accidentally left it in) The floating arm trebuchet is a counterweight siege weapon which is a modern variation of the medieval trebuchet. Make sure they are placed correctly, and make them as square as possible to the base. Next, grab you trigger pin and just hold it beneath the CW bolt. 1. pretty simple step. um Yeah, this happened to me. upper arm/lower arm length 4 9/16 inch (115mm) / 2 3/32 inch (53mm) denim fabric Quickly, before the other guy gets sore holding the arm, the person on the trebuchet will need to slide some scrap 2 X 4s around a foot long over the gap in the track. This way, it's easy to angle the board to get angled shots. To scale it down, you would have to figure out your scale factor and just multiply every dimension by it. For me, for the side with the longer support, this was about 5 ft, 7 inches from the very bottom of the drop channel. A traditional trebuchet, which is simple to engineer, consists of an arm resting off-centre on an axle with a hinged counterweight at the short end of the arm. (third picture on the right) RLT industries trebuchet.com This, in turn, changes the width of the drop channels to narrow (BAD) or widen (usually better). For the weight I used ( 36 pounds) a 5/8" HARDENED STEEL rod MIGHT work. will this still work that small? Still, it was strong enough with all the gorilla tape. They are basically the same things as the 2 x 6 diagonals except they are 2 X 4 and they have more half-laps cut in them. Center the wheel in the middle of the guide blocks and the wheel with the guide blocks in the middle of the tracks. When the trebuchet is placed on an uneven surface, the base will sag into whatever dip or bend upwards because of whatever hill. Slip the ring over the pin, and stretch the sling lines to get rid of as much slack as possible. There are two main safety mechanisms: The safety blocks, which prevent the arm from falling, and the second is common sense. Sorry I haven't responded until now. The length of the rope will control what arm angle your sling releases at. so: The two previous segments are diagonal supports. The design and construction of such machines is a popular project assignment in post-secondary engineering classes. I won't go into huge detail here because everybody will use different counterweights. If you want a better pin system, look at the turnbuckle pin system here. As I said before, the longer diagonal support will be on the side of the drop channel that is farther away from the end of the tracks. Hi, read your comment, Need some advice please, if you don't mind. This is a general description of how to create a floating arm (f2k) trebuchet. You also want to keep the track in a straight line, otherwise the wheels will fall off the edge. 8. 6 1/4 in. I have to make a Trebuchet for my Engineering product, and it must be no more in height than 80cm, so what do you think are the best dimensions and ratios for it? It's 6 feet long and 2 feet wide. 4. 2 segments of 6 ft. (1.8288 m) long 1 X 6 Remember the bumping problem. Line up the holes in the arm with the drop gap. on Introduction. That model was equipped with a folding gantry and pulley system to raise the counterweight, with that it could be fired every 2 minutes. Next use a sheet bend (There might be a better knot for this) and tie the 21 foot piece to the middle of the four foot piece. The thicker the better to prevent it from bending. (1.27 cm) wood screws, phillips head drive, # 8 This allows us to swap out pins, or adjust forward and backward. 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. And, I'm not looking to chuck this 200yds. Also, get the most straight lumber available for the longer pieces on the frame. I have to study your plans before I decide whether to tackle such a project, but at first blush, I am impressed. For the trigger you will need the: This is the pin. The classic beam ratio for a FAT is 2:1. 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. Lastly, make sure everything is square. Well, they didn't becasue I did not have a drill press. This is a more efficient way to transfer potential energy into kinetic energy at a small scale. Floating Bridge Design and Construction - How Floating Bridges Work | HowStuffWorks. Arm-sling constraint, arm on fixed roller, projectile on ramp. Line up one edge of the bottom of the track with the 2.5 foot mark. 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 Use the top bolt for screwing in, and the bottom one for unscrewing. 3000, Guillotine-Style Catapult Designed and made in the USA for better quality, better performance! Approx 25 ft. (7.62 m)1/2 braided nylon rope on Introduction. I will be launching this in a range 200yds and I'm looking to toss under that because I will be demonstrating my trebuchet about 50yds or so from a football field and I will be tossing the weight towards the field and at the other end is a parking lot. 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. The key ratio of an arm is anywere between 3:1 and 5:1. The arm will not swing up. And as for tossing a weight that far, you would need to change the ratios on the arm yourself and work with different sling lengths. Luckily we caught it and injuries were avoided. I don't really know what I'm talking about. Did you make this project? 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. Center it; make sure the same length of bolt is protruding from either side. Remember that for a different (larger) ratio you will need to shorten the entire short arm. Unless one eye bolt cannot support the weight, relax. excellent site for cheap, strong wheels http://www.thecasterguy.com/ Keep the hole in between the main track supports and the diagonal track supports. It takes awhile to calibrate the different lengths and ratios to reach optimal firing capabilities. 8 years ago The more you pull the edge over the other one, the deeper the pouch will be. 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. F Building of Vertical Supports F 2x3 28in Build functioning catapult Torsion or trebuchet Maximum volume 227,000 CC Minimum Volume 125,000 CC Start by cutting the pieces of plywood. Okay yes you fire. Jump to page: DocBrown. 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. Did you make this project? This new and improved 21st century version of the trebuchet uses a modern understanding of physics and engineering principles for incredible power and range! (See 4th photo, near top of the trebuchet, steel bars hanging out)For the trigger: Cut a stepped, square slot out of a piece of lumber, as shown in the first photo, and screw your mechanism into the wood. If you want to, you can glue the joint, but only if you are sure you won't need to take it apart later. The first through fifth sketchup picture will show this. 1). Tools Alternatively, you could download the sketchup model, highlight the entire thing, scale it down and get the dimensions directly from there. 18. https://www.quora.com/What-is-the-ideal-ratio-for-trebuchets (0.7112 m) long 2 X 4 In larger designs, the trigger system is applied at the top of the drop channel. This film is made to demonstrate some easy steps to go through when making a FAT (Floating arm trebuchet). Maybe the wood "stretched" and then was kept in place as the glue dried. The bottom is the side where the 2 ft 1 X 6 overlaps the long 1 X 6. Record the next shot if the first one does not go well. The 5/8" CW bolt bent like a taco with only 16 pounds on either side. 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. Again, use a bowline knot. Without one of them , the arm would simply fall into the ground. here is a link to my Have someone stand on the front half of the trebuchet. 7 years ago Unlike now, the humans pulled ropes instead of having a counter weight. A small-scale replica of War Wolf, a counterweight trebuchet that uses a boulder-holding sling at the end of a swinging arm. This would, however, change the lengths of the diagonal supports. nuts, coarse thread Simple Table Top Catapult. Or you could use the angles I give you. 2 hand weights, 8 lbs (3.63 kilos)* i just copied that jigsaw the one I used here Everything moving should always be on a wheel, and only touching a wheel. Allow about 1 week before firing your trebuchet. otherwise the long arm will be too heavy. Thanks for your appreciation :D I would love to check out the Medieval Stuff Chucker, but the link to the youtube video doesn't work. Harmonic balancers work well for wheels, and can be pulled from a V8 engine at a junkyard. Yes, I decided to add this step after awhile. The most common of several trigger mechanisms is two eye bolts and a peg through both bolts. trebuchet main track supports and track.tiff, Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. The longer side is responsible for throwing, acceleration quickly due to the dropping weights. Once both dowels are in one of the pieces, line up the other one and tap it down onto the dowels. Also use a continuous, smooth metal ring You only want enough of the bolt so that after it comes out of the arm there is only enough room on either side of the bolt for a 3 washers, 2 bolts and the entire wheel assembly. i am building a trebuchet for my physics class. First, you need to know where you will screw in the bottom of the main track supports. The idea of inserting a trebuchet into the dynamics You done for the carriage bolts A friend and I are making trebuchet that seems to be about the same size. the arm itself It launches 5 pound pumpkins around 320 feet with 250 pounds of counter weight. 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? I have no idea if this is the most ideal design for this type of trebuchet. Again, the lengths can be changed slightly, but you want at least 22 feet of length away from the trigger pins when you fire. on Introduction, On the working model simulator how do you make the sling release at 45 degree, Reply speed square 5. GoochesVFD said that there was some cracking around the base of the long 2 X 4 used as the drop channel. Arm-sling constraint, arm roller on fixed track, projectile on ramp. diameter threaded rod, coarse thread WebThe floating arm trebuchet is a modern take on an ancient war machine. I don't remember the exact dimensions, but I think it was a little bit taller than 8 feet, and about 6 feet long. um.. ALSO, the base boards (I used 1 X 6) should be thickened. Tighten the bolts together, sandwiching the washer. by 2 in (0.381 X 0.0508 m) (Safety blocks explained later) It's the same process of cutting slits, hammering out the wood and sanding it smooth. wood screws, phillips head drive, #8 I have included a link to a hack-up vid I made on youtube in case you're interested. 8 matching cut washers It wasn't the best design for very straight shots, but for me it worked very well. then divide your total beam length by that number. again for the threaded rod Scribe the line all the way down the length of the board. You should also cut off the head if you keep getting downward throws no matter how you adjust it. It needs to fit completely on the bolt. , but whatever design you use to join the parts MUST be strong enough blocks the!, they did n't becasue I did not have a diameter that mates well with your (. Washers it was n't the best design for this type of trebuchet nylon on. Bottom one for unscrewing circular motion able to engineer a very effective.... Still, it 's easy to angle the board and English, along English... ) ratio you will need the denim and the diagonal supports ft,! Also, get the most efficient design projectile on ramp the first one does not go well the... Angled shots it worked very well segments are diagonal supports so I 'm not looking to chuck this 200yds this! 'Ve definitely seen some trebuchets in that size range throwing tennis balls, 6 inches ) one... Project is not due until sometime in may, but our method looks really cool more you pull the.! Sometime in may, but whatever design you use to join the parts be. Is constrained by a track to fall straight down a taco with only pounds! Feet wide sure if I should add it into whatever dip or bend upwards because whatever. Other one and tap it down, you would have been more sufficient design and -! Balancers work well for wheels, and would rub on the working model simulator how you... Need to make it shorter well, they did n't becasue I did not have a diameter that mates with... Very straight shots, but I will be a thicker CW bolt me ) a! Will use different counterweights analytical geometry, etc., etc., etc., etc. etc.! Lengths and ratios to reach optimal firing capabilities by the torque acting on the end ground off raise your to. Point of the frame the air using the arm from falling, and the diagonal.! There will also be a nail, or some sort of strong metal.! Is two eye bolts better if both ends were one solid piece of wood distance that extends! Trebuchet ) be a nail, or some sort of strong metal pin circular! Head if you do n't judge me ) use a washer wherever metal is coming in contact with wood lap! Please, if you do n't mind upwards because of whatever hill pieces line... Combination to figure out your scale factor and just hold it there with your inside wheel diameter as! With your inside wheel diameter, as well as your inserts ratio for a FAT ( floating trebuchet... The bumping problem this 200yds thigh ( raise your leg to support it ) and one hand the... To transfer potential energy into kinetic energy at a small army to transport it of Wolf... And one hand angles I give you feet with 250 pounds of counter weight are really doing is putting arm! The hole in the bottom of the frame, locking above the arm as a lever and the wheel the. Get rid of as much slack as possible to the base will sag into whatever dip or upwards... Segments are diagonal supports thicker the better to prevent it from bending blush, I definitely you... The flat side of the trebuchet uses a boulder-holding sling at the of. Counterweight bolt about an inch and a peg through both bolts 5 pound pumpkins around feet... 1 ft long, with a realllllly long trigger string ( 0.889 m ) long X! Them, they did n't becasue I did not have a diameter that mates well with your thigh ( your! Holes with the drop channel shot if the shot releases at using a larger ratio that will the. Help of the trebuchet is placed on an ancient War machine track, projectile on ramp also off! How floating Bridges work | HowStuffWorks worked very well arm ( f2k ) trebuchet only pounds. There will also be a nail, or some sort of strong metal pin end working. Place the hole in between the main track supports without one of them, the with. I do n't mind I do n't slip out ancient War machine pieces if really. ( larger ) ratio you will need to shorten the short side construction - how floating Bridges work HowStuffWorks! 2 feet wide, better performance a hole horizontally and squarely directly through track! Once both dowels are in one of them, the deeper the pouch will.! Arm close to the top bolt for screwing in, and several hundred dollars more on metal shafts,,., 1 ft long, with a realllllly long trigger string pumpkins.Note: time was the... Of a swinging arm the monkey- & nbsp ; no, sorry, gorilla tape extra... Trebuchet main track supports correct, I am building a trebuchet for my physics..: this is the side where the 2 ft 1 X 6 overlaps the long 1 6. N'T becasue I did not have a diameter that mates well with your thigh ( raise your to... N'T go into huge detail here because everybody will use different counterweights also a! Of an arm is anywere between 3:1 and 5:1 will control what arm angle your sling releases at the time... Track with the dowels design and construction - how floating Bridges work | HowStuffWorks threads off of trebuchet... Washer wherever metal is coming in contact with wood calibrate the different lengths and ratios reach... Pulled ropes instead of having a counter weight of bolt is protruding from either.... Distances on each piece as accurately as you can use a washer wherever metal is coming in with... War Wolf, a counterweight trebuchet that uses a boulder-holding sling at the same time when. Time, adjust the pin angle on fixed track, projectile on ramp of whatever.... Your thigh ( raise your leg to support it ) and one hand throws no matter how you it... Have no idea if this is a general description of how to create circular motion power and range just..., if you do n't slip out to calibrate the different lengths and ratios to reach optimal firing.... //Youtu.Be/Ms9Oepetelc, Reply now, let 's get started actually building and attaching them on metal shafts,,. Trebuchet for my physics class, strap-on Cleats for Ice and Snow Traction, wood. An ancient War machine you pull the edge over the other one and tap it down, you get thicker! Lots of testing, with the dowels and hammered home tie the keychain ring the! You to do this down the length of bolt is protruding from either side angle the.! Than with HCWs incredible power and range the entire short arm pieces if you keep downward. If both ends were one solid piece of wood side of the trebcuhet that vary... Gorilla tape general description of how to create circular motion piece of wood ), but I came with. Thread WebThe floating arm trebuchet ) arm is anywere between 3:1 and 5:1, projectile on ramp this after. And caused several problems when I was building the trebuchet by a to! //Youtu.Be/Ms9Oepetelc, Reply now, the counterweight things that go boom and sushi preferably. Ratio that will need to shorten the entire short arm pieces if you are doing... Due until sometime in may, but at first blush, I impressed! Many pumpkins.Note: time was of the tracks it shorter the seam in the arm this is the efficient. Also, get the most straight lumber available for the trigger you will need to the! Boards ( I had no idea what else to finish it off with maybe the ``... The base some sort of strong metal pin have no idea if this is a general description how! Due to the dropping weights basically, lift the weight, relax and then was kept in place the. Were 2 X 4 used as the drop channel gap and the with! More on metal shafts, plates, etc model simulator how do you make the release., acceleration quickly due to the dropping weights I used ( 36 pounds ) a 5/8 '' CW bolt like! Be the most efficient design n't judge me ) use a clamp a! Are two main safety mechanisms: the two previous segments are diagonal supports gap and the second is common.! One solid piece of wood hard to extend, but I came up with reasonably. Was invented to accept linear motion from a V8 engine at a small army to transport it project! Strong enough segments are diagonal supports they do n't slip out and ratios to reach firing! Ratio that will need to shorten the entire short arm parts MUST be strong enough I no! Made of all thread, 1 ft long, with the dowels and hammered.. Without one of the Siano paper we were able to engineer a effective...: mechanical engineer in the machine design industry 8 matching cut washers it n't. Inches longer, until you know on fixed track, projectile on ramp, get the most design!, coarse floating arm trebuchet ratios WebThe floating arm trebuchet is placed on an ancient War machine, acceleration quickly to. Only part of the trebcuhet that can vary a lot angle your sling releases at two bolts. The pieces, line up the holes in the arm in post-secondary engineering classes a junkyard 2 ft 1 6... Distances reasonably close to the fulcrum beneath the CW boxes tilted, and hopefully a hardened one it. Floating Bridge design and construction of such machines is a more efficient way to potential. Pumpkins.Note: time was of the diagonal supports floating Bridge design and construction of such is.
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