I used the trebuchet frame as a fulcrum to lift it in the air. Next, grab you trigger pin and just hold it beneath the CW bolt. Can the trebuchet launch a 6-lb shot? 1. Make the arm from the 1/2" x 3" x 36" pine board. Line them up so that their 1.5 inch edge is adjacent to the edge of the 2 ft 1 X 6, and so that their 3.5 inch edge is on the outside cut edge of the long 1 X 6. 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. here is a link to my Put a generous amount of glue on the flatter side, the 3.5 inch side. We had initially planned for around 500 lbs load, but were able to use gym weights and get close to 800 lbs without damaging the shafts.Our design required that we load each weight one at a time onto the weight bar using ladders. 4 segments of 4 ft., 5 in. Follow the measurements given of the depth and width of the cut. So, cut the first twisting brace, on the very front, as wide or narrow as you need it to keep the drop channels straight. WebSmall floating arm trebuchet plans. Lastly, 50 pounds that was used here. 7 years ago. NEEDS TO BE MADE THICKER: LOOK AT IMPROVEMENTS The straight track drop is an idea used in a FAT (Floating Arm Trebuchet), or in our Baby ASOK (Arm Slides Over Cam). Place your projectile in the sling. What did you finally use for the rollers? 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 them small as possible, but make sure they can still guide the arm until its wheels hit the track. Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz) New 08 Jul 2012 #21. Ideally, the arm should be vertical or slightly forward when the sling releases. The pin is made of all thread, 1 ft long, with the threads on the end ground off. for the sling 6. The CW bolt MUSTbe made thicker and stronger, otherwise it will bend and cause problems. ) 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. Punch the holes centered as shown and directly on either side of the seam. Grab 3 of the 2.5 foot pieces. For me, this was a little more than halfway through the side pieces. We didn't have time to do a thorough dynamic stress analysis, so we slowly added more weight. 1 segment of 7 ft. long 2 X 4 However, if you want your arm to be longer, just buy this piece longer. They keep the side-to side motion of the tracks to a minimum. Put the ratio hole wherever it goes. (1.5875 cm.) The box should have a bottom that is "outside" the walls, screwed in from this bottom and into the walls, not through the walls and into the bottom. 6. otherwise the long arm will be too heavy. Floating Bridge Design and Construction - How Floating Bridges Work | HowStuffWorks. Short arm, washer, bolt, washer, wheels and bearings, washer, bolt. Main track supports (remember the CW is supported by the trigger at the beginning, and the the trigger is screwed directly into the drop channels. ) Then just screw them in. A good way to estimate the range is to use conservation of energy. 10 ft. (3.048 m ) of gorilla tape 1 segment of 7 ft. long 2 X 4 the next 3 specifically show the dimensions for the short side. It includes what I used at the time. This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. If you are going to use a shorter ratio, such as 3.5 : 1, make the short arm pieces shorter. Make the long arm lighter. 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. 4. All scaled proportionally from the larger version (the tall vertical pieces are 130mm long, throwing arm 150mm). If the shot releases at the wrong time, adjust the pin angle. This way, it's easy to angle the board to get angled shots. nut, washer, guide block, wheel and bearings (Go together) , guide block, washer, nut. (0.635 cm) washers, matching carriage bolts It has two ropes coming off it, one in either direction. Then drive 2 screws through the board with the actual channel on either side of the gap, diagonal from each other so that you can fit two into the narrow width of the wood on either side of the gap. 9 years ago 15. We are to have a constructed trebuchet and have it prepared to launch on Tuesday, April 23. WebThe trebuchet dates back to the middle ages where they were used as a siege weapon. 12. Other than those, there haven't really been any problems with the frame. This might change depending on your weights setup. Beside the arm when it's at rest, these two channels are the tallest point of the trebuchet. Or you could buy a longer beam to begin with. Arm-sling constraint, arm roller on fixed track, projectile above ramp. So, again, cut off the ends of all the 1 ft, 5 in. Double- check everything. And, I'm not looking to chuck this 200yds. on Introduction. The CW boxes tilted, and would rub on the drop channel when it dropped. For me, for the side with the longer support, this was about 5 ft, 7 inches from the very bottom of the drop channel. 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. I'm pretty sure I made my dowels 1/2" wide and 8 inches long. Sorry I haven't responded until now. Once everything is square, true, straight aligned or whatever you feel like saying, We can put this beast together. Allow about 1 week before firing your trebuchet. The third clip in the video shows this problem well- the arm kind of rolled over and on top of the guide blocks because they were too high. For them to fit, I had to cut different lengths off of the diagonal supports. X 3.5 in. It's been 4 years since I built this in 8th grade (graduated high school by now), but its still lots of fun to set up and launch! If I need to bring the scale down, what would the dimensions be? Do you have the plans for this small one or pictures from different angles and aprox heights? That should bend it back upward. ALSO, the base boards (I used 1 X 6) should be thickened. No specimens or models from medieval times survive. The part of the war machine that means business. um The arm slowed down a lot, and the ball spit out the back. 2 screws for each mitered channel support. Just in case you didn't know these will be used in the trigger Lastly, cut through the plywood rectangle so the wheel does not bump over the edge of the plywood as the arm falls. Ensure that the shafts you choose have a diameter that mates well with your inside wheel diameter, as well as your inserts. Unless I've forgotten something, I think we're done. Keep the hole in between the main track supports and the diagonal track supports. 4. I won't go into huge detail here because everybody will use different counterweights. *look at the last step, improvements. I just so happen to be in the construction phase of an improved floating arm trebuchet. More diagonal supports. It was built to be strong, but because of that it's a bit heavy and inflexible. Licensed under CC BY 3.0, via Wikimedia Slide the bolt through one hole, screw everything on in this order: DRILL PILOT HOLES FOR EVERYTHING!!!!!! Mark the height that you want the diagonal support to rise to. Lean the supports in towards the drop channel as they go up so they don't slip out. The axle bolt hole would be drilled in the short arm 1.5 feet from the end. Stick a few inches of tape over that area, making sure you get it on the inside and outside of the seam. Make sure that there are no cracking noises or flexing from the joint. The tighten the bolt against the short arm and the bolt on the very outside. how long was the arm after the extension? There are plenty of places you can go on the internet to look for better ideas. 2 hand weights, 8 lbs (3.63 kilos)* on Step 15, This is stellar. The distance that it extends out from the diagonals affects the distance a lot. 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. Again, the lateral placement in this corner does not matter as long as both edges of the diagonal meet evenly along the track and support. 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. nuts, coarse thread wood screws, phillips head drive, #8 grab the last 3 ft, 6 in 2 X 4s. Also, the diagonal track supports are different heights (As you can see in the sketchup model) because in the original plan, the two mitered side drop channel supports were not included. Make a square line across the flat side of the board. 2 rectangles of 3/4" in. I wish I'd have seen yours before we designed it, I went with a 2:1 ratio for the arm, and we may have been able to make it a bit longer. It shouldn't be too deep or to shallow for your projectile, and should hug the surface of your projectile well. Did you make this project? Here are some stats, note that these apply to the original #2 treb. On the folds themselves, use one strip of tape per side with a slight bit of overlap and stick the two pieces together. These are the pieces of wood directly on either side of the drop channels. Just cut a length of 2 X 4 To fit in the spots shown in the pictures. Hey Chans2901, Thanks for your questions, I love trebuchets! 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. on Introduction. Use a forstner bit or any other drill bit and drill holes parallel to the length of the long 1 X 6 and near the inside corner. Our weights were 18" diameter and 4" thick, weighing 80-90 lbs each. (Order from inside to outside.) (8TH picture) Then tape them in place. I don't remember the exact dimensions, but I think it was a little bit taller than 8 feet, and about 6 feet long. (2.54 cm.) on Introduction. Make sure they are placed correctly, and make them as square as possible to the base. Line up one edge of the bottom of the track with the 2.5 foot mark. i am building a trebuchet for my physics class. If you could find a simulator that would be great, but I never could. The arm is split into two parts by the fulcrum. Remember, if you make your drop channel wider for a wider CW bolt, You may need to cut the washers down even more and move the bolts farther to the outside. i need to make mine 3x3x3. And do lots of testing, with a realllllly long trigger string. But I'll try. Okay now you need to cut the axle. drill (The one I used here came in a kit here) with a varied drill bit set, for pilot holes, etc. Push them up against the drop channel. So I'm still not sure if i should add it. Use three screws in every place that the diagonal touches the track or support. then, to check we add the short arm and long arm length together: Remember, though, that if your short arm is shorter you will need fewer bolts. 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. Okay yes you fire. WebStep 2: Prepare the Arm. Again, not critical. the base If gym weights are not available (we arrived at the competition and found out they were, so this was basically a waste of time for us, and gym weights are more dense and easier to lift into the weight bar) then make your own counterweight using concrete and steel pipe. Use a drill press if you are going to drill one hole because one hole needs to be better aligned than a bunch of smaller ones. The second picture shows what it should look like after they are screwed in. Now I'll tell you how to lock load and FIRE! Raise the CW to the top and hold it there with your thigh (raise your leg to support it) and one hand. Next, going to the back of the frame, we have the guide wheel and the guide blocks. You done Take off the drop channels completely so you can cut through here. It should be easy enough to follow. 3. So we built a 10 throwing arm trebuchet. The axle will have to easily pass in between them. This new and improved 21st century version of the trebuchet uses a modern understanding of physics and engineering principles for incredible power and range! Before we start, there were a few problems. I've uploaded PDF's of the CAD drawings as well as a general schematic diagram for an f2k. We did indeed build a small scale floating arm trebuchet very close to the specifications your physics assignment is calling forand it has demostrated ability to throw small "bouncy balls" from a vending machine 270 feet, and big bouncy balls (slightly bigger than a golf ball) over 180 feet. The trebuchet, as is, would probably not be able to launch such a heavy projectile, but I'm not sure. Bolt on the CW boxes. Thank you for reading through all this, and let me know if you actually build this monster!! Now comes the fun part. Use a washer wherever metal is coming in contact with wood. Just as a reminderremember to add glue I came across a problem for the quick release. This film is made to demonstrate some easy steps to go through when making a FAT (Floating arm trebuchet). Luckily, It's also pretty simple to make. *look at the last step: improvements. Grab your nylon rope and cut 4 feet off the end. Remember, smooth transitions. 6 1/4 in. Taper the arm from a full 3" at the axle to 1" at the finger end of the arm (Fig. (0.635 cm) diameter, 5.5 in. The first 5 pictures (except the first and second) specifically show the dimensions for the "long" side. Now, to attach it: Imagine the pouch itself. Make sure all the hardware can support whatever CW you are using. I would love to see it while being constructed and finished. WebVirtualTrebuchet is a web based trebuchet simulator that will allow you to quickly evaluate different trebuchet configurations. slide the bolt the rest of the way through the other hole. Forming tube is expensive, so instead, cut a cardboard barrel into strips or tack thick cardboard onto a piece of plywood to make forms. excellent site for cheap, strong wheels http://www.thecasterguy.com/ Thanks for the great instructable! At the tip of the arm, we welded a steel box around it to hold the pin for the sling release and a loop to tie the other end of the sling rope to. It's 6 feet long and 2 feet wide. (0.4318 m) long 2 X 4 On the end of the arm, there will also be a nail, or some sort of strong metal pin. Whenever you feel like it, slip in the other trigger pin, with the eye toward the front. 1 keychain ring Our arm was made of many pieces of layered plywood held together with resin and deck screws. Our starter model was 1/6 scale, it threw a bouncy ball 270 feet with 10 pounds of counterweight. This is the only part of the trebcuhet that can vary a lot. NOW AND ONLY NOW take out the safety blocks. 10 years ago Also, the box needs to have a top so the weights don't come flying out when it reaches the bottom of the drop. Did you make this project? Place the hole for the counterweight bolt about an inch and a half from the end. Phsstpok's rule works well in determining the BR, maybe better than with HCWs. NEVER, NEVER LEAN OVER THE ARM!!! This, in turn, changes the width of the drop channels to narrow (BAD) or widen (usually better). Today we have a look at a modern design for a Trebuchet that still works with Medieval Engineers parts.. What I do not Add a little lube to the linkage and the clamp itself if needed. Try to make it as flat and planar as possible, as this will minimize the need for adjustments later. Keep everything tight. I really appreciate your work in building this instructable. There are countless designs that are probably better. Start by cutting the pieces of plywood. Clamp the beam and let it dry, allowing the appropriate time for curing (follow resin instructions). 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. therobotichand, would you mind posting any materials or tutorials you used? It's a little bit tricky to get the angles perfect. You also want to keep the track in a straight line, otherwise the wheels will fall off the edge. WebThen, the floating arm trebuchet's arm length ratio and sling length were then optimized. it would be much appreciated!! The frame is made of 4x4 held together with deck screws and carriage bolts, and our design allowed for the frame to be removed from the base with bolts only. 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. This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. Lastly, make sure everything is square. 7 4.5= about 1.6 Ask Question Comment Download -Use screws! For the drop channel, I would recommend using two separate boards for each side. MAKE SURE THE EYE OF THE TRIGGER PIN IS FACING THE FRONT OF THE TREBUCHET otherwise you will have to switch it. Actual distance: 300 feet. http://mort11.org/pumpkinalso be sure to check out the rest of our website, FIRST is a great program for anyone interested in engineering! long carriage bolts 2 segments of 2 ft. (0.6096 m.) long 5/8 in. Again, the lengths can be changed slightly, but you want at least 22 feet of length away from the trigger pins when you fire. The floating arm trebuchet uses a counterweight held on top of a tall drop channel to transfer potential energy into kinetic energy. Reducing the drop distance of the wheel axle to the glide track would reduce damage, but also reduce the range of the trebuchet. Circuits | Floating Arm Trebuchet : 7 Steps (with Pictures) - Instructables 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. And it is constructed with 1 X 6s Axel for the masses is coathanger wire but ensure the axel never absobs the full impact of the falling masses as it will bend. (7.62 X 3.81 cm) diameter wheels, 5/8 id bearing load rating of 200 lbs (90.71 kilos) or more I'm still not sure. To include the look in improvements, may need to be changed Place the weights in the box and screw on the top. Ok, now you need to flip over the long (6-ft.) pieces and slide the two foot pieces underneath. Make sure that the washer in between the CW box and the drop channel is not caught on the bolts protruding from the eye bolts (Trigger pin holder.. things) Make sure it will be able to fall freely, But do not remove the safety yet. look out for flying cats First, obviously, just lay the arm in between the drop channels (Just the middle of the treb) Now comes the moment of truth. Mortise and tenon joints here would be best, but I didn't feel like they were necessary. 7 years ago 2 segments of 2 ft (0.6096 m) 1 X 6 The person on the ground should pull back and down on the arm like a lever, using the guide wheel as a fulcrum. Additionally stresses on the arm will be (exponentially?) I'm still working on the "improvements" page but everything I was going to mention on it was kind of already mentioned throughout the instructable. Make sure the gap is aligned with the supports and the gap in the drop channels. Next we have the drop channel supports. WebThe 5DOF Floating Arm Trebuchet This is the floating arm trebuchet with a sling. if theres is any other advice that you can give me (especially for it being smaller) it would be a lot of help. the short arm is the 1 (In the ratio) and the long arm is the 3.5 (in the ratio) -3.5 times longer than the short arm. Ok, find a flat surface and 3 scrap pieces of 2 X 4. on Introduction, do you have the exact dimensions of the final product. The lines shown in the 9th picture show 2.5 feet. We built a 1/3 scale model that throws a 1 pound projectiles 340 feet + with 70 pounds of counterweight. To launch such a heavy projectile will require much more weight than the approx. Remember you need to make two of these. the arm itself (Should be square to the length of the board, like a crosscut.) WebLaser Cut Desktop Trebuchet. [2] This pulls the counterweight upwards slightly after a launch. 3. We just built an hinged counterweight trebuchet for our annual group camp of friends from highschool (we're all in our 30s now.). You also need the braided polyester cord and the keychain ring. Tie the each end of the four foot piece to one of the trigger pins. It will differentiate depending on your ratio. 9. I want a 3.5:1 ratio and 7 ft long total beam. Now, I believe that the width between the bottom of the main track supports is somewhere around 1 ft, 1 inch. *A few notes: the angles were based off of the sketchup model which had a few errors. Use a bowline. When the trebuchet is placed on an uneven surface, the base will sag into whatever dip or bend upwards because of whatever hill. You also might want to improve the pin system-at least make sure your pin is smooth. 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. 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? there are small cracks throughout the trebuchet now because I was lazy. I'll explain later This may need to be changed Then fold in on top of the other one to crinkle the pouch into a more pouchy shape. First, grab your counterweight bolt (hopefully thicker than 5/8") and use some sort of clamp to keep it pushed up against the top piece of wood, as if it was being loaded. 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. 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. So, use the turnbuckle system I mentioned in the introduction. Add the two numbers of your ratio together. Again, make sure a 5/8" bolt can easily fall through. 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. 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. Once smooth motion is achieved, begin adding weight, but do not fire anything until a max weight test is done. The person standing on the trebcuhet is no longer in danger unless he drops the bolt on his foot. Line them up carefully and bolt through the arm with carriage bolts to hold them together. We will be building this for our college pumpkin launch later this summer. And back up at least 20 feet when firing (The sides are safest) Simple Table Top Catapult. [2] The difference in the lengths of the two ends of the arm provides mechanical advantage. Center it; make sure the same length of bolt is protruding from either side. Maybe the wood "stretched" and then was kept in place as the glue dried. 7. Luckily, I eventually lined up the holes. It took a lot of force to wrench the bolts through because they did not line up. Thats a bit longer than 7 feet because i rounded 7 4.5 up, it was really 1.55555555 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. Cut the threads off of the long eye bolts. 3. Once the higher edge is at the height mark you made, trace a line on the diagonal down the mitered side support. I have real pictures, but no sketchup ones. Look at the pictures for alignment. Virtual Trebuchet is a free web based trebuchet simulator. 3. 9 years ago Additionally, I would make the arm as long as possible as well. I'll post pictures as we get underway. 4 segments of 1 ft., 5 in. Approx 25 ft. (7.62 m)1/2 braided nylon rope The angle and length of the pin control when the sling opens. A small-scale replica of War Wolf, a counterweight trebuchet that uses a boulder-holding sling at the end of a swinging arm. WebFloating Arm Trebuchet - Hobbyist Version The F.A.T. *(One note, this rod is probably too thin. Wheels are from the rotating platform from a microwave but any small stong wheel will do. ), but I came up with distances reasonably close to the actual performance. COMMENT RATE (Look at the picture) 8. Now, measure that same distance on the base. FIRST PROBLEM I like things that go boom and sushi, preferably at the same time. The thicker the better to prevent it from bending. While this is happening, the wheel is moved backwards by the torque acting on the arm from the counterweight. First of all you need two people You should have 21 feet left. 2 1/2 X 10 eye bolts Hey I just made that up right now. To reduce friction of the sling on the launch track, the track should have a smooth surface.[5]. The two marks should be 6/8" apart. Simulator. Parallel to the seams, cut all the way through so that you can open it into one sheet. 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. ( usually better ) sag into whatever dip or bend upwards because of that it easy! Channels are the tallest point of the sling on the arm for interested... Place the hole for the counterweight upwards slightly after a launch beam and let it dry, the... Plenty of places you can go on the launch track, projectile above.... And the bolt against the short arm, washer, bolt, washer, nut up least!, these two channels are the tallest point of the trebuchet frame a... 5 pictures ( except the first and second ) specifically show the dimensions be the pieces of wood directly either! Of 2 ft. ( 7.62 m ) 1/2 braided nylon rope and cut 4 feet off the of... Main track supports and the bolt on the internet to look for better ideas were! Added more weight grab the last 3 ft, 1 ft, 1,. Down, what would the dimensions for the great instructable as possible the... You How to lock load and FIRE should n't be too heavy, like a crosscut. down. Pieces shorter dimensions for the `` long '' side it prepared to launch on Tuesday April... Depth and width of the trebuchet 3.5:1 ratio and sling length were then optimized 20 feet when firing the... Ft. ( 7.62 m ) 1/2 braided nylon rope the angle and length of 2 X 4s bit. Tricky to get angled shots is at the wrong time, adjust the pin angle edge! Monster!!!!!!!!!!!!!!!... 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You trigger pin, with the threads on the diagonal supports pieces are 130mm long throwing! Second picture shows what it should look like after they are placed correctly, and the guide.. This was a little bit tricky to get the angles perfect 've uploaded PDF 's of pin. Weight, but because of whatever hill 130mm long, throwing arm )! The safety blocks it took a lot the thicker the better to prevent from... Is, would probably not be able to launch such a heavy projectile, and the spit. Projectile will require much more weight than the approx Wolf, a counterweight held on of! Drop channels completely so you can cut through here looking to chuck this 200yds the... Materials or tutorials you used moved backwards by the torque acting on arm! Just as a general schematic diagram for an f2k drop channels to narrow ( BAD ) or widen usually. Itself ( should be vertical or slightly forward when the trebuchet are small cracks the! The distance a lot ( look at the end to estimate the range is to use conservation energy. Also might want to improve the pin is smooth but because of that it out... The bolts through because they did not line up control when the opens! [ 2 ] this pulls the counterweight bolt about an inch and half! It: Imagine the pouch itself 's rule works well in determining BR. Block, wheel and bearings ( go together ), guide block, wheel and bearings ( together! Cracks throughout the trebuchet is a free web based trebuchet simulator channel to transfer potential into! Channel when it 's also pretty simple to make we have the plans for small. Tricky to get angled shots the trebuchet ) and one hand the approx guide the arm as long possible! Can still guide the arm should be thickened switch it version ( the tall vertical pieces are 130mm,. Or slightly forward when the trebuchet uses a boulder-holding sling at the finger end of a swinging arm the,! Beast together 's at rest, these two channels are the pieces of wood directly on either of... Lines shown in the air program for anyone interested in engineering middle ages where they were used as a to! Will allow you to quickly evaluate different trebuchet configurations picture shows what it should n't be too heavy trebuchet as! Until its wheels hit the track in a straight line, otherwise the arm... Glide track would reduce damage, but I came up with distances reasonably close to the top I a! Back up at least 20 feet when firing ( the sides are safest simple!
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