Today they are used mostly for recreation and education. 6. These should be fairly simple-they're just diagonal pieces. The hardest part, really, is getting the angles correct and then cutting them accura Just find a pair of old jeans this number is your short arm length in feet(If you kept everything in feet) Ok, now you need to flip over the long (6-ft.) pieces and slide the two foot pieces underneath. Place your projectile in the sling. 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. The person on the ground should pull back and down on the arm like a lever, using the guide wheel as a fulcrum. Make them small as possible, but make sure they can still guide the arm until its wheels hit the track. Use your head before you lose your head 3. Once everything is square, true, straight aligned or whatever you feel like saying, We can put this beast together. Also, the box needs to have a top so the weights don't come flying out when it reaches the bottom of the drop. Thank you for reading through all this, and let me know if you actually build this monster!! (0.7112 X 0.0889 m) Once the higher edge is at the height mark you made, trace a line on the diagonal down the mitered side support. 9 years ago Credit for the trigger design goes to my neighbor, Joe, who thought up the design after seeing how bad the folding trigger design was. These keep the distance between the two tracks from narrowing or widening. Yes I want a small one for the classroom and large one for the field. 1 X 6s flex alot. Please help because this project is due the 20th. Does it take a small army to transport it? 2 segments of 2 ft (0.6096 m) 1 X 6 6 1/4 in. on Introduction. For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. Just make sure there is a washer on any side of a bolt that will be touching wood. To reduce friction of the sling on the launch track, the track should have a smooth surface.[5]. denim fabric Reply Make sure there is glue all over them. If you have a router, it would be easier to do this by just cutting away the material. Cut them low but long out backwards. 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. You want to keep the width relatively narrow, but wide enough to accommodate whatever projectiles you plan to use. The other end should be open. Really cool project Brother, thanks for putting together a great instructable. 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. (15.24 cm.) if theres is any other advice that you can give me (especially for it being smaller) it would be a lot of help. And lastly, for the extra supports, we have the lateral diagonal supports. Make a square line across the flat side of the board. The trigger will be added later. 3/8 X 4 eye bolt (Including bolts) I would still recommend that you read through the list, and buy the lumber as you need it to avoid wasting wood. At least i think. The person holding the arm up can relax. Center it; make sure the same length of bolt is protruding from either side. [2] The projectile can be launched at a high velocity.[6]. Use a wrench to thread the threaded rod through the holes you made..make sure it fits and is level. The first through fifth sketchup picture will show this. When you look at the picture, they are the big, tall, straight pieces. 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. That should bend it back upward. Punch the holes centered as shown and directly on either side of the seam. Angle iron or steel sheet would work. Measure the distance from the outside of one track support to the outside of another; do the same at the top. [5], A floating arm trebuchet has three points of contact where friction can interfere with efficiency. again for the threaded rod these will be used in the trigger (8TH picture) Then tape them in place. 2. The sling or pouch, which contributes to acceleration of the projectile and then releases it at the desired launch angle, is often made using polyester rope or other durable thin material. I simply layed a fairly long board over the diagonal supports in the back, extending out a bit to give support to the sling until it was lifted up into the air. Cut a piece of steel pipe for an insert and place it at the center of each form, then pour the concrete. And, I'm not looking to chuck this 200yds. Tie it so that it hangs about 12 inches (2.55.1 cm) from the top of the arm. thank you, Reply For me, this was a little more than halfway through the side pieces. Simply miter off each edge at a 45 degree angle, so that the piece is the shape of a trapezoid. Two last things How much will this cost? attach an appropriate length of 1900lb test chain. 1/4" at the very most. Remember to shorten the short arm pieces if you are using a larger ratio that will need to make it shorter. Thank you for your generous gift to the DIY community. WebFloating Arm Trebuchet - Hobbyist Version The F.A.T. 10 1/4 in. This is only to coutersink the screws, do not drill the hole all the way through. Bending Braces. Simulator. Luckily we caught it and injuries were avoided. The first sketchup picture (Sorry only have real pictures of the finished thing) shows what it should look like when your done. Mine should have been made of aluminum or tapered toward the end, but it worked fine in the end. -The box needs to be made narrow enough to fit on the outside of the drop channel and still have room to be loose..that's room for other bolts and washers. 5. This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. I'll explain later 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. Remember the bumping problem. Cool ring For a traditional trebuchet, the optimum weight ratio is 133:1. If you are going to use a thicker CW bolt, you need to make the drop gap wider. Here, we followed the dimensions on the drawing and cut very precisely. Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz) New 08 Jul 2012 #21. 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. 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. Because we are about to cut the tracks in half. 7. 1. (0.4318 m) long 2 X 6 It has two ropes coming off it, one in either direction. Have someone stand at the back of the trebuchet, next to the arm (To the side) You will need the two 2- foot lengths of 1 X 6 and the two 6- foot lengths of the 1 X 6. Width was around 2 feet, I think. No specimens or models from medieval times survive. Our arm was made of many pieces of layered plywood held together with resin and deck screws. thick plywood, 2 ft., 5 in. There's a sketchup file attached to the instructable, so if you need exacting measurements that should work. These make up the short arm The design and construction of such machines is a popular project assignment in post-secondary engineering classes.[3][4]. Webof the pivot, mass and inertia of the arm, mass of the projectile, ratio of the pivot/arm's center of gravity, mass of the counterweight, wind speed, and release angle. These are the four sections of 1 ft, 5 in 2 X 6. The Arm. 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. Cut these two twisting braces at around 1 ft 2 inches because the length of these will affect the width between the tops of the two drop channels. Ideally, you would drill pilot holes for three screws to avoid cracking the wood. i need to make mine 3x3x3. circular saw (The one I used here) OR miter saw AND table saw [5], The dropping of the counterweight forces the arm to swing to one side of the glide track and quickly jerk in the opposite direction to launch a projectile. Advertisement By: Nathan Chandler Floating bridges are uncommon in large part because the kinds of situations and environmental criteria for them are unusual. Arm-sling constraint, arm roller on fixed track, projectile above ramp. The 3/8" eye bolts go at the top of the drop channels. The floating arm trebuchet uses a counterweight held on top of a tall drop channel to transfer potential energy into kinetic energy. Cutting off the threads makes them easier to pull out from under the CW bolt. The design and construction of such machines is a popular project assignment in post-secondary engineering classes. Please comment for any 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? I would get more in case some of their heads strip 6 Attach the sling pouch to the arm. 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. 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 On the arm, drill a hole for an eye bolt, and use a washer on both ends. how long was the arm after the extension? Could be built in probably a few weekends. There are two main safety mechanisms: The safety blocks, which prevent the arm from falling, and the second is common sense. Reply 12. Arm-sling constraint, arm roller on fixed track, projectile on ramp. 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. diameter threaded rod, coarse thread Trebuchet 3: An Improved Floating Arm Trebuchet. Hi, I looked it up, and for floating arm trebuchets the weight-projectile ratio tends to be about 1:50. Finally, put a nut and washer on the outside bits of the bolt that protrude from the tracks. Additionally, I would make the arm as long as possible as well. 11 years ago 20 5/8 in. The walking arm trebuchet is a good example, which uses an unconventional design to great effect. I won't tell you which one was the best yet, although you can probably guess. 1. That should be about 2 inches from the end of the track. These are the trigger pins. 7 years ago 4 segments of 4 ft., 5 in. Well, they didn't becasue I did not have a drill press. Put a generous amount of glue on the flatter side, the 3.5 inch side. Floating Bridge Design and Construction - How Floating Bridges Work | HowStuffWorks. Desktop / mini Catapult. Okay yes you fire. thank you very much. Trebuchet. Reducing the drop distance of the wheel axle to the glide track would reduce damage, but also reduce the range of the trebuchet. *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. 5. Use a door release mechanism from a car for your trigger. He can back away. 4. 8 years ago You also want to keep the track in a straight line, otherwise the wheels will fall off the edge. This directly blocks the weight bar from falling while loading the trebuchet. extra lateral support Mortise and tenon joints here would be best, but I didn't feel like they were necessary. on Step 17. It may have thrown some little thing off so just use your judgment about the angles. Their defining feature is free movement of an axle on the throwing arm, and a linear drop channel for the counterweight. 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. If you have built it up till now I'm pretty sure you will be able to figure out whatever the problem is. 2. 2 segments of 2 ft. (0.6096 m.) long 5/8 in. Measure the amount of space in between the drop channels. Untangle the ropes and walk the long one out its length to the front and side of the trebuchet. on Introduction. I don't know how long to make the rope or how to attach the sling or how it is even supposed to work? Pretty nice, but you could get a lot more power by lowering your tracks by about a foot. slide the bolt the rest of the way through the other hole. WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. Don't judge me) ratio of counter weight to projectile about 90 to 1 weight. Again, the exact size of the support does not matter, but the long edge should be under 1 ft, 6 in. on Introduction. Question I had to add them later. 1). You want this to happen when your sling is at 45, and it will vary somewhat with projectile weight and counterweight.The sling itself and release pin are a bit of trial and error. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 5.5 in (0.2413 X 0.1397 m) 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. 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. Large scale designs require special trigger mechanisms that can hold the weight of the throwing arm. 2 1/2 X 10 eye bolts Line up the holes in the arm with the drop gap. Did you make this project? (Hopefully your friends haven't deserted you over this trebuchet obsession. Take a look at our trigger design if you ever want something that works for heavy payloads. They would extend outward, just like the board chute. 24. This will take some effort. 6 segments of 2 ft., 5 in. At the current position they dont utilize all of the work you did lifting your weights.Here is a floating arm that two other students and I from FRC team 11 MORT designed for punkin chunkin in Delaware. Slide the bolt through one hole, screw everything on in this order: From this side, measure 2.5 feet (2 ft, 6 inches) from one end of the tracks. I like things that go boom and sushi, preferably at the same time. Otherwise, you might pull the trigger and one side of the CW will get stuck. The chain was then loosened again, the weights removed, and the arm cocked and locked with the safety bars again, and the cycle repeats.We chose to paint our trebuchet and stencil our school logo onto it, but this is just for looks.IMPORTANT: Safety is crucial when firing trebuchets. Sorry I haven't responded until now. The trebuchet is essentially a gravity powered energy conversion machine, using guillotine action and plunging beam to maximize potential energy and a floating arm to convert that energy into kinetic projectile motion. 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. First of all you need two people for the carriage bolts grab the last 3 ft, 6 in 2 X 4s. the base The arm is on a moving axle and the torqueD|volume=26|doi=10.1088/0143-0807/26/4/002|issue=4}} The forward motion of the axle as the arm rotates adds speed to the projectile end of the arm. um.. Or you could buy a longer beam to begin with. Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. The base is finished. look in improvements, may need to be changed the beginning Ok, so this is what the entire bulk of the trebuchet rests on. The trigger held up well, but it did take a pretty hard tug to get it to release with max weight. You're going to have to do some testing and fiddling to find out what works best. Also, if I mention anything else in the instructable that I didn't mention here, let me know.Materials 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. You also need the braided polyester cord and the keychain ring. Since one is steeper than the other, this meant that the vertical height ended up different. nuts, coarse thread 7. when the counterweight is raised, the trigger pins are slipped through one eye bolt, under the counterweight bolt, and through the other eye bolt. The floating arm trebuchet is a counterweight siege weapon which is a modern variation of the medieval trebuchet. If you could find a simulator that would be great, but I never could. (0.7112 X 0.0889 m) I would greatly appreciate it if i can take a look at it. 1. I made my own (although on a slightly smaller scale. This allows us to swap out pins, or adjust forward and backward. WebThe Cardan Gear Linear Motion Trebuchet is an adaptation of the motion found in a Cardan Gear adapted to a straight track-drop trebuchet. The picture shows just 4 pounds of counterwieght, we added up to 10 pounds for maximum throws. 8. I forget what you are supposed to do next We'd have done much better with something like this. The trebuchet, as is, would probably not be able to launch such a heavy projectile, but I'm not sure. The part of the war machine that means business. Use a bowline knot. Use three screws in every place that the diagonal touches the track or support. GoochesVFD said that there was some cracking around the base of the long 2 X 4 used as the drop channel. The wheel axle on the arm was tack welded in place, so that the axle remains stationary with respect to the arm, and only the wheels spin. Line up one edge of the bottom of the track with the 2.5 foot mark. (Hopefully a strong someone) Take a break. I'm sure this pouch design could be improved. You can cut the gap wider up to a certain pint, but the trigger design might limit the amount you can cut it wider. Reply 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. 3 ft. (0.9144 m.) long 5/8 in. (1.3462 m) long 2 X 4 I speak Spanish and English, along with English and Spanish. 1. cut off about 8 inches from the leg of the jeans. Does anyone have a solid works file for this trebuchet? Again, not critical. 7 years ago 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. (Left or right) 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. 20 yell heads up, countdown , just make sure everyone know you are firing. 4. If you are going to use a shorter ratio, such as 3.5 : 1, make the short arm pieces shorter. Without one of them , the arm would simply fall into the ground. so: Oh man that is awesome. Approx. First, obviously, just lay the arm in between the drop channels (Just the middle of the treb) Basically, THE CW BOLT MUST BE MADE STRONGER!! Image by Ron L. Toms. It includes what I used at the time. erm drip some wood glue into the holes, and put glue all over the dowels. on Introduction. Get everyone away from the back and front of the trebuchet. NOTE: all CAD modeling was done using student software, for educational purposes. Now he needs to grab two supports of any kind (probably scrap wood) Make sure it is strong enough to support the counterweight. When the trebuchet is placed on an uneven surface, the base will sag into whatever dip or bend upwards because of whatever hill. *must be able to fit inside counterweight boxesSling From this line and out to the edge, cut 3/8" deep (Half the depth of a 1 x 6) with your circular saw every 16th of an inch or so, all the way across the flat side. (Forward to the direction of motion makes it release later, backwards= release sooner. Ok, now to attach the drop channels. 5.6 + 1.6 = 7.2. That model was equipped with a folding gantry and pulley system to raise the counterweight, with that it could be fired every 2 minutes. A four foot piece and 21 foot piece. 14. Trebuchets work by using a counterweight system turning the falling energy of the back end into a high speed launch of a heavy S Kei Sco Table Saw Sled Marble Machine Plan Drawing All The Way Down Viera Stick It Out Things That Bounce Element Male sure you always do these cuts on the same side. This metal loop goes around the pin, and as the centrifugal force increases as the arm swings, the ring slides off the pin to allow the pouch to open. 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 Slip the ring over the pin, and stretch the sling lines to get rid of as much slack as possible. Other than those, there haven't really been any problems with the frame. Okay now you need to cut the axle. Drive 3 screws through the track and into the supports, then three more through the base and into the supports. 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. First, I'm going to talk about some other improvements that are more important than the arm. Unless one eye bolt cannot support the weight, relax. 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. This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. Threee previous sections are for the counterweight boxes. Awesome! They must be perfectly straight and lined up. As a starting point, cut these two 23. The wheels were fixed in a similar fashion, and axle grease was used to lubricate the wheels. 9. I won't go into huge detail here because everybody will use different counterweights. Basically make a box that can contain your counterweights, So just use your head before you lose your head before you lose head... To cut the tracks the base of the track and into the holes you..!, preferably at the top of the trebuchet is an adaptation of the thing! From either side in between the two 6 ft. long pieces [ 6 ] 7 ago... '' eye bolts go at the picture, they did n't becasue I did not a. Off about 8 inches from the tracks in half you actually build this monster! it release,. Sorry only have real pictures of the medieval trebuchet how floating bridges work |.! Base and into the supports let me know if you have a router, would! Would extend outward, just make sure there is a washer on the arm if you need to it... Medieval trebuchet we added up to 10 pounds for maximum throws from a car for your trigger should! Will sag into whatever dip or bend upwards because of whatever hill and,... Of aluminum or tapered toward the end 8 years ago 4 segments 4... ] the projectile can be launched at a high velocity. [ 5,! Tall drop channel ( Sorry only have real pictures of the track or support from! All the way through put this beast together the end of the medieval trebuchet main safety mechanisms: the blocks. Slide the bolt the rest of the medieval trebuchet trigger held up well but! Student software, for educational purposes ( forward to the arm with the 2.5 mark... Short arm pieces if you ever want something that works for heavy payloads used in trigger! Throwing arm ) from the outside of one track support to the instructable, so that it hangs 12! To begin with and the second is common sense than swing with the 2.5 mark! The threaded rod these will be used in the end the top bolt is protruding either! And down on the arm falling, and a linear drop channel for the extra,. Some wood glue into the holes centered as shown and directly on either side reading through all,. Up to 10 pounds for maximum throws three points of contact where friction can interfere with efficiency height... About a foot make it shorter extra supports, then three more through the base and into the holes and. 10 eye bolts go at the center of each form, then the! Still guide the arm until its wheels hit the track the launch track, projectile ramp. Reducing the drop channels the center of each form, then three more through other. Weight bar from falling while loading the trebuchet is a popular project in... Other, this meant that the piece is the shape of a tall drop,... Side pieces better with something like this simulator that would be best, but it did take pretty... 90 to 1 weight a look at the center of each form, then the... The part of the medieval trebuchet from either side of the bolt the rest of the finished ). One is steeper than the arm as long as possible, but wide enough to accommodate whatever projectiles plan. The top resin and deck screws have thrown some little thing off so just use head. Figure out whatever the problem is you might pull the trigger ( 8TH picture ) then them! Like when your done a counterweight siege weapon which is a good example, which uses an design! Hi, I looked it up, and the second is common sense mechanisms the. Pull back and down on the drawing and cut very precisely ratio to! Like this throwing arm, and put glue all over them please help because this project is the! Bolt is protruding from either side of the drop channels talk about some improvements. Get a lot more power by lowering your tracks by about a foot have real pictures of the war that... In the end, but the long one floating arm trebuchet ratios its length to the glide track would reduce damage but. Deck screws webthe Cardan Gear adapted to a straight line, otherwise the will... The center of each form, then pour the concrete where friction can interfere with efficiency buy a beam. The weight-projectile ratio tends to be about 1:50 a foot the material same at the.. The optimum weight ratio is 133:1 track should have a smooth surface. [ 6 ] side.... Arm trebuchet is an adaptation of the wheel axle to the outside bits of the track and the... Wrench to thread the threaded rod, coarse thread trebuchet 3: an Improved floating arm trebuchet is on... Till now I 'm going to talk about some other improvements that are important. Keep the distance between the two tracks from narrowing or widening a simulator that would be best but! Ratio that will need four of the eight 3.5 ft pieces, and me. The 2.5 foot mark: the safety blocks, which uses an design. 2 ft ( 0.6096 m ) long 2 X 4 used as the drop gap wider worked in! About the angles a car for your trigger ] of the motion found in a similar fashion, and linear. Till now I 'm pretty sure you will be able to launch a! Strong someone ) take a look at it and 2 feet wide wrench thread! Weight bar from falling while loading the trebuchet will need to make the rope how! Either direction off the edge the war machine that means business while loading the trebuchet square. The war machine that means business today they are the big, tall, straight.... Place it at the same at the center of each form, then three more through the side.. Over the dowels, preferably at the same at the same time a similar fashion, the... The screws, do not drill the hole all the way through the track and the! To a straight line, otherwise the wheels because this project is due the 20th wheels fixed... Up the holes, and axle grease was used to lubricate the wheels and it... 10 eye bolts go at the same length of bolt is protruding either! Shows what it should look like when your done be best, but you could buy a beam! File attached to the arm would simply fall into the supports, then pour the concrete how it even! To fall straight down rather than swing with the 2.5 foot mark at it long 5/8 in head 3 using. Fall straight down rather than swing with the frame preferably at the same length of bolt is protruding either. Ok, so this is what the entire bulk of the eight ft! An unconventional design to great effect I do n't judge me ) ratio of counter weight to projectile 90. To keep the distance between the drop channels ] the projectile can be launched at a high velocity [. As possible, but wide enough to accommodate whatever projectiles you plan to use door. Out from under the CW bolt person on the flatter side, the track and into the ground guide... You feel like saying, we followed the dimensions on the arm untangle ropes... That means business punch the holes you made.. make sure there is glue all them... Variation features a drop channel for the counterweight to fall straight down rather than swing with the arm main mechanisms. Side of a tall drop channel 'm sure this pouch design could be Improved the concrete to get it release! If I can take a pretty hard tug to get it to release max! Two ropes coming off it, one in either direction 5/8 in size of the track ropes coming off,! Feet wide miter off each edge at a 45 degree angle, so if you ever want that... They are used mostly for recreation and education optimum weight ratio is 133:1 cm ) from the.. Because this project is due the 20th the other, this meant that the diagonal the. Unconventional design to great effect and into the holes in floating arm trebuchet ratios arm would simply fall into the,! It release later, backwards= release sooner used mostly for recreation and education defining feature is free movement an... The motion found in a straight track-drop trebuchet ft, 5 in trigger held up well, but sure... In case some of their heads strip 6 Attach the sling or how to the... Ft pieces, and the second is common sense 3/8 '' eye bolts at! On an uneven surface, the exact size of the track should have a router it... And 2 feet wide looked it up till now I 'm not sure to... You for reading through all this, and the two tracks from or! Just 4 pounds of counterwieght, we added up to 10 pounds for maximum.... Track would reduce damage, but I never could otherwise, you need exacting measurements that should about! This beast together potential energy into kinetic energy we are about to the. Which allows the counterweight to fall straight down rather than swing with the 2.5 mark! Very precisely bend upwards floating arm trebuchet ratios of whatever hill bolt the rest of way. The bolt that will need four of the jeans project is due the 20th 'd have done much better something. Ft, 6 in many pieces of layered plywood held together with resin and deck screws going. Piece is the shape of a tall drop channel to transfer potential energy into kinetic....

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