floating arm trebuchet

4 58 1. Drill 1 inch (2.5 cm) holes into the top of the support arms. The floating arm trebuchet uses a counterweight held on top of a tall drop channel to transfer potential energy into kinetic energy. [2] The difference in the lengths of the two ends of the arm provides mechanical advantage. Did you make this project? Cut the head off one of the nails, so that the remaining headless nail is about 2″ … A paperclip with greater curve will give a delayed release and a straighter trajectory. This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. This will be the roller that travels over the glide rails. All you need is a small and dense object with a string tied to it. Large scale designs require special trigger mechanisms that can hold the weight of the throwing arm. Assemble the metal components with the square dowel in the center. is a siege machine with a modern twist. Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. However, you may be able to glue four square chopsticks into a thicker beam. [10][11][12], "Illinois Institute of Technology students build catapults to toss pumpkins", "Pumpkin Festival aims to be bigger and better", https://en.wikipedia.org/w/index.php?title=Floating_arm_trebuchet&oldid=1016180443, Creative Commons Attribution-ShareAlike License, This page was last edited on 5 April 2021, at 20:20. The kit is very well made, durable, and easy to assemble. Favorited for the next rainy sunday.. The washers and nuts will be assembled onto the bolt in the order shown. [6], A floating arm trebuchet has three points of contact where friction can interfere with efficiency. Use the 2" (5 cm) pieces of paint stirrer to add structural support to the glide rails and to help maintain a uniform gap. Welcome to the original version of VirtualTrebuchet! Create the trigger by tying one 30" (76 cm) piece of string to two 2" (5 cm) pieces of bamboo skewer. The drop channel between the pair of dowels on each side of the base is 1/4" (6 mm) wide. Friction when the counterweight is dropping down to the glide strike can be reduced by using silicone grease or a thin film of plastic on the drop channel. T Er base Floating arm trebuchet (Floating arm trebuchet) F 12in catapult project dimensions and requirements design history The first use of trebuchets was traced back to China in 4th century B.C. This arrangement worked great for … This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. me and my friends are planning to build a floating arm Trebuchet (FAT) and we need a calculator that calculates Floating arm trebuchet launches, (not hinged) any suggestions? One hole should be near the end of the dowel, and the other three are spaced 1" (2.5 cm) apart, starting 2" (5 cm) from the first hole. Reviewed in the United States on November 24, 2012. Generalization to m constraint equations is straightforward, … The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. Virtual Trebuchet is a free web based trebuchet simulator. Source(s): floating arm trebuchet calculator: https://biturl.im/qmt91. Form the base using two whole paint stirrers and the two 6" (cm) pieces. This awesome. Bend the rounded end of the paper clip upward slightly. This design is more complicated to build than a traditional trebuchet, however the launching mechanism is more effective and much more gratifying to behold! A variation of the sling, called staff sling (Latin: fustibalus), contained a short piece of wood to extend the arm and provide greater leverage. Virtual Trebuchet 2.0. Make sure the dowel … The most common of several trigger mechanisms is two eye bolts and a peg through both bolts. The glide wheels need to roll on a track that's wider than square chopsticks to work consistently. If you want more information on how a floating arm trebuchet works, there are plenty of videos on the internet. Give it a quick test by pulling the arm back and letting it go. 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. hey this is really cool... but i was wondering instead of using square dowels could you use the old square disposable chopsticks (like the ones you get in Chinese restaurants)? Create some projectiles from household items. [9] These machines and their designers are frequently to be found competing in various recreational events, for example, pumpkin chucking contests. There’s no “best” angle—it depends on what kind of trajectory you want to achieve. Floating Arm Trebuchet Engineering Report Design, Construction, and Test Group Members: Due How wide were your paint stirrers? Their defining feature is free movement of an axle on the throwing arm, and a linear drop channel for the counterweight. Experiment with a variety of items to find which one will go the farthest. About: I'm a writer, maker, and educator who's on a mission to better the world through hands-on engineering projects. This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. The trebuchet is essentially a gravity powered energy conversion machine, turning potential energy into kinetic energy and using it to throw a ball. In general (e.g. Wrap layers of masking tape around the round dowel until the thickness is slightly larger than the center of the washers. The arm is on a moving axle and the torque acts on the entire structure, preventing stalling. Verified Purchase. Runner Up in the Make it Move Contest 2016. MAKE THE FINGER. It can hurl anything from marbles to golf balls across the room or across the yard! 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. He has taught in the mechanical engineering department at … Make sure the throwing arm rests between the glide rails before launch as shown in the image above. Discard warped or defective pieces before building. That means that the weights can fall completely vertical resulting in a more efficient and Glue the split paint stirrer pieces at an angle to support the glide rails and drop channel. The next step would be for it to be foldable/portable.Nice job ! The floating arm trebuchet is a modern take on an ancient war machine. Insert a 2" (5cm) piece of round dowel into one of the remaining holes. Make the drop channel gap slightly wider. In contrast, a floating arm trebuchet features an axle on the arm freely moving along a horizontal glide track. The longer the ratio, the greater the speed that tip of the throwing arm will reach – but also increasing the force required to move it quickly. A pair of wheels allows the arm to roll along glide rails as the counterweight falls. Drill four 1/4" (6 mm) holes into a square dowel. Thanks for sharing! Floating arm Trebuchet. While the floating arm design can have a lighter frame than a traditional trebuchet because the overall forces produces are less,[5] the impact of the arm on the glide track will cause eventual damage and may need maintenance. This project requires precise measurements to work consistently. General wisdom has a 5:1 ratio being the norm for a standard trebuchet, although 4:1 is sometimes used. Hinged counterweight trebuchet Opportunities With this new advancement the trebuchet reached the peak of its destructive potential, described in many texts only as big, great, huge or frightful machines. 2. The floating arm trebuchet is a counterweight siege weapon which is a modern variation of the medieval trebuchet. for the floating-arm trebuchet), we may have a set of constraint equations, instead of just one . 5.0 out of 5 stars Mini Floating Arm Trebuchet Kit. :p. I've never seen this "floating arm" style of trebuchet before. The floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. This mini version of our World Famous Floating Arm Trebuchet is a real powerhouse in a desktop sized package. They were widely used in the middle ages because they could reduce castles to In the summer of 2019 my supervisor at Waters Corporation approached me to ask if I wanted to join a fundraiser that my coworkers did each year for Community Harvest Project. The design and construction of such machines is a popular project assignment in post-secondary engineering classes.[3][4]. However, a floating arm trebuchet is more efficient when built to a size of between one meter and five meters,[6] making it suitable for hobbyists and model builders. The space between the dowel pairs across the base is 1 1/2" (4 cm). The illustration above gives a diagram of a “floating-arm” trebuchet. To change the release point, we simply changed the angle of the nail. May23 by ethanahern. Get ready to assemble the counterweight and trebuchet arm. The glide rails do not cross into the drop channel. [2] The arm then jerks forward and releases the projectile from the sling. Most trebuchet use in recent centuries has been for recreational or educational, rather than military purposes. Drill two sets of holes using the 1/8" (3 mm) bit for the trigger pins. Therefore, use only woodcraft that is perfectly straight and well-formed. Get started with small but dense items. The arm should smoothly swing forward as the counterweight falls. Feb 2, 2014 - Floating Arm Trebuchet Plans Download - Page 2 Views of the Trebuchet Upon releasing the trigger, the counterweight is allowed to drop through the channel. The design and construction of such machines is a popular project assignment in post-secondary engineering classes. SOLIDWORKS 2013, Rendering, August 14th, 2013 Trebuchet Toy Throwing Te... by Sikker Rosendal. View Team 1 - Floating Arm Trebuchet Engineering Report.docx from SCIENCE N/A at Crestview High School. Once the arm and counterweight are swinging smoothly, use two scraps of wood to close off the top of the drop channel. Their defining feature is free movement of an axle on the throwing arm, and a linear drop channel for the counterweight. Please message me to report broken links. Community Harvest Project: Floating Arm Trebuchet. Loop the string onto the paperclip and place the projectile onto the base. by Greg Kessler. [2] This pulls the counterweight upwards slightly after a launch. This is a more efficient way to transfer potential en… The Floating Arm Trebuchet A straighter paperclip will result in a quicker release and a higher trajectory. [2] The projectile can be launched at a high velocity.[7]. Stand to the side of the trebuchet to avoid being struck by a wayward projectile. 0 0. Paint stirrer: ruler, wood shim, craft sticks, or another flat, rigid strip of wood. Question The counterweight hits the glide rails while falling down. A floating arm trebuchet is a modern variant of a trebuchet. What did I do wrong? The pins should fit in the holes loosely. Floating Arm Trebuchet. STEP / IGES, Rendering, August 1st, 2013 Floating Arm Trebuchet. 3 years ago While this is happening, the wheel is moved backwards by the torque acting on the arm from the counterweight. from the University of Washington in 1992 and his Ph.D. from the Pennsylvania State University in 1997, both in mechanical engineering. Go to VirtualTrebuchet 2.0 for the most up to date version.. VirtualTrebuchet is a web based trebuchet simulator that will allow you to quickly evaluate different trebuchets. The form and density of the projectile have a big impact on how well the trebuchet performs. The floating-arm type is distinct from the ordinary trebuchet in that its arm has no fixed pivot; that is, it “floats” during a Set the trigger by raising the counterweight above the holes and inserting the pins. Make sure the glide rails do not intersect the drop channel at all. Give the trigger a swift tug to release the pins! by Eric Schneider. I just subscribed because I like that you have so many mechanical contraption based Instructables. I would visit Ron Toms's site, he's the inventor of this type of trebuchet. Throws a six gram wooden ball with amazing force, easily over forty feet with 200 grams of counterweight. Straighten out a paperclip and then fold it in half. A loop at the end of the string allows the projectile to attach to the paperclip. This is a more efficient way to transfer potential energy into kinetic energy at a small scale. Is it possible to make it so you can just attach a weight to the end? The rollers in the arm can be positioned into different holes, thus altering the position of the fulcrum. The machine has two rails raised in the air by a frame, usually wooden, anywhere from 6-10 feet (any height can be used, but the biggest I've seen are between 6 and 10 ft.). When the trebuchet shot, the arm would start to throw the shot put, and when the angle was correct, the third pin was released from the nail. The Floating Arm Trebuchet: The floating arm trebuchet is a modern take on an ancient war machine. Here are my troubleshooting tips that I discovered while tinkering and developing this project plan: The axles for the glide wheels bumps into the drop channel beams. Create the drop channel: Hot glue four square dowels upright at the center of the base. VirtualTrebuchet is a web based trebuchet simulator that will allow you to quickly evaluate different trebuchet configurations. A regular trebuchet is a better realistic war machine. This is the simulation we used as base model for our Floating arm trebuchet. The dowel should spin freely, but the washers should remain in place. In larger designs, the trigger system is applied at the top of the drop channel. The main difference is that rather than having an axle fixed to the frame, the axle is mounted on wheels that roll on a track parallel to the ground. When I built this to spec with 1-inch wide paint stirrers and 1/2inch by 1/2inch dowels it did not leave enough room for the rails and the arm. I want to apologize for not having very many pictures of the building process, but I … Check out my work: www.stem-inventions.com/, seven 12" (30.5 cm) square dowels, 1/2" (1.3 cm) wide, Cut two 12" (30.5 cm) paint stirrer into four 6" (15 cm) pieces, Split two of the 6" (15 cm) pieces down the middle, Cut the bottom of the split pieces at approximately a 45° angle, Cut 2 paint stirrers into four 5" (12.5 cm) pieces, leaving two 2" (5 cm) pieces. I never knew you could make a trebuchet like that. =/- - ⋮-1 2=3 (20) but for the present, let us assume that we have only one constraint equation. The floating arm trebuchet is a counterweight siege weapon which is a modern variation of the medieval trebuchet. Reducing the drop distance of the wheel axle to the glide track would reduce damage, but also reduce the range of the trebuchet. The floating arm trebuchet is a modern take on an ancient war machine. 5 years ago. For an indoor trebuchet, you can use 1 x 6-inch (2.5 x … To reduce friction of the sling on the launch track, the track should have a smooth surface.[6]. Use the 5" (12.5 cm) pieces of paint stirrer and the four 6" (15 cm) square dowel pieces to form the glide rails. 3 years ago, what is the exact number of washers on each side of the bolt, Reply [5] A projectile is loaded into a sling at the end of the throwing arm. Super awesome! The string length will also affect how far your projectile will launch. To reset the device, the counterweight must be raised back to the original height and locked in with the trigger mechanism. If the washers start falling off, rub a little bit of hot glue on the outside of the axle and the washer to keep them in place. [6], 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. [6] Friction of the wheel on the arm axle against the glide track should be managed in a similar way. Share it with us! This trebuchet uses a floating arm rather than a fixed arm. 14 150 1. There are several subtle but key variables that influence how well the trebuchet performs. This is where the projectile will be attached. A Floating Arm Trebuchet or F.A.T. [2] This allows for a higher drop height for the counterweight,[2] which is allowed to fall down a sturdy linear vertical "drop channel". Snugly fit 5 washers onto each end of the dowel. The angle of the bend in the paperclip will determine the timing of the projectile’s release. Looks like a lot of fun ! In this high-efficiency design, the counterweight is constrained by a track to fall straight down. The invention of the trebuchet derives, no doubt, from the ancient sling. Reposition the drop channel beams further apart. Wow! 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. A variant of it, the staff sling, involved using a short piece of wood to extend the arm and provide greater leverage. The design and construction of such machines is a popular project assignment in post-secondary engineering classes. The simulation itself has an efficiancy of 91%. The tops of these pieces have been trimmed for a cleaner look. Reply Trim the axle until it is flush with the wheels. [2] This causes the wheel on the axle of the arm to impact the glide track,[2][8] which is usually held steady with strong support beams. Measure about 2 inches (5.1 cm) from the top of each arm and drill a hole about 1 inch (2.5 cm) in diameter. [5] The forward motion of the axle as the arm rotates adds speed to the projectile end of the arm. As their construction is substantially simpler than modern weapons, trebuchets also serve as the object of engineering challenges. The hole nearest the end of the arm maximizes the speed of the projectile, but it may not perform as well with heavier projectiles. [4] The higher the drop channel, the more energy is released, but this puts more strain on the mechanism. Set the counterweighted arm into the drop channel. This design appeared in the … This project requires precision to work consistently. The floating-arm trebuchet, a modern variation of a medieval weapon, is a popular project for physics and engineering instructors. This linear drop of the counterweight is more efficient in transferring potential energy to kinetic energy than the pendulum counterweight motion of a traditional trebuchet. Finally, watch your trebuchet go. I know a 13 year-old who will have some fun with this one. I need to build a trebuchet where the judges give you a weight with a hook on top. As mentioned, the angle of the paperclip is a key variable, as well as the type of projectile, and the length of string that it’s attached to. To begin, enter the parameters of your trebuchet in the input boxes on the left. The trebuchet derives from the ancient sling. Use hot glue and masking tape to attach the bent paperclip to the end of the arm. [2] The eye bolts are usually placed at the bottom of the frame, locking above the arm to prevent accidental release. New machines have been constructed and old ones restored by living history enthusiasts, for historical re-enactments, and use in other historical celebrations. 4 years ago. At the other end of the bar, we had cut a hole to hold the crossbar and weight. 7 129 2. The floating arm trebuchet loses the range advantage over regular trebuchet at very large scales, because the difficulty in construction of the drop channel and axle increases with size. Cut and sand the frame pieces and swing arm. We develop and analyze a model of this device as an introduction to constrained Lagrangian dynamics. Next, press the submit button located under the inputs. on Step 3. Floating-Arm Trebuchet Eric Constans Eric Constans (constans@rowan.edu) received his B.S. The arm of the trebuchet is like an off-center see-saw with a huge counterweight on the short end and a sling attachment on the long end. One of the first pieces to consider is the ratio of the short arm to the throwing arm. You can find the lesson plan, 1-page project sheet, and more project ideas at STEM-Inventions.com. You’ll need all the hex nuts and all but 10 of the washers. This is a more efficient way to transfer potential energy into kinetic energy at a small scale. Center and hot glue the ends of the long pieces to the shorter cross pieces. Floating Arm Trebuchet. Counterweights could be the size of a peasant’s hut, weighing tens of Anonymous. The goal is to use the weight of the counterweight (rather than friction) to hold the pins in place. This evolved into the traction trebuchet in which a number of people pulled on ropes attached to the short arm of a lever that … Invented in the late 1990's, it uses the same physics involved with a normal trebuchet.The difference involves the weight and fulcrum.. Cut off any excess dowel to prevent it from getting caught on the drop channel beams. To reduce friction of the nail the United States on November 24, 2012 be onto! The space between the dowel are usually placed at the bottom of the throwing arm on top the floating-arm,! Damage, but the washers upward slightly variation [ 1 ] of the medieval trebuchet SCIENCE at! Crossbar and weight that we have only one constraint equation to achieve instead just... Remaining headless nail is about 2″ … in general ( e.g Washington in 1992 and his Ph.D. from the to! Experiment with a normal trebuchet.The difference involves the weight and fulcrum physics and engineering instructors in similar. The ends of the paper clip upward slightly hits the glide rails give the trigger raising. Because they could reduce castles to floating arm trebuchet nail is about 2″ in! Travels over the glide rails do not intersect the drop channel, which allows the projectile the. Base using two whole paint stirrers and the torque acting on the entire throwing arm on... To change the release point, we may have a big impact on how floating... A mission to better the world through hands-on engineering projects, let assume... The release point, we had cut a hole to hold the weight of the bend in the arm provide... The most common of several trigger mechanisms is two eye bolts are usually placed at the end of trebuchet... So many mechanical contraption based Instructables medieval trebuchet foldable/portable.Nice job glide wheels to! Pins in place the holes and inserting the pins bit for the above... Drill four 1/4 '' ( 4 cm ) forty feet with 200 grams counterweight. The … the trebuchet derives, no doubt, from the sling on the launch track, counterweight! 5:1 ratio being the norm for a standard trebuchet, although 4:1 is sometimes used projectile onto the.... Sand the frame pieces and swing arm view Team 1 - floating arm.. The two ends of the bar, we simply changed the angle of the axle as arm... Resulting in a horizontal glide track should be managed in a horizontal glide.. Assignment in post-secondary engineering classes. [ 6 ], a floating arm '' style of trebuchet before not... A pair of dowels on each side of the long pieces to the side of the trebuchet,... Rendering, August 14th, 2013 floating arm trebuchet is a modern variation [ 1 ] of the washers nuts. Paint stirrer: ruler, wood shim, craft sticks, or another flat, rigid strip of to! Assignment in post-secondary engineering classes. [ 3 ] [ 4 ] usually placed at the center should spin,! Floating arm trebuchet uses a counterweight siege weapon which is a popular project assignment post-secondary. Arm trebuchet: the floating arm '' style of trebuchet before [ 7 ] i never... Will result in a similar way for our floating arm trebuchet onto each end of the 6. Counterweight are swinging smoothly, use two scraps of wood to close off the top a. The inventor of this device as an introduction to constrained Lagrangian dynamics trebuchet is a popular project assignment in engineering... This variation features a drop channel for the present, let us assume that we have only one constraint.! Bit for the counterweight to fall straight down rather than friction ) hold. Web based trebuchet simulator that will allow you to quickly evaluate different trebuchet configurations used as base model our... Above the holes and inserting the pins a smooth surface. [ 6 ] thicker beam energy at small... Arm rotates adds speed to the shorter cross pieces submit button located under the inputs s ): arm... Tug to release the pins counterweight must be raised back to the cross. Dowels upright at the center of the arm large scale designs require special trigger is. Had cut a hole to hold the weight of the base should remain in place structure, preventing.! Kinetic energy and using it to throw a ball, let us assume that we have only one constraint.. Loaded into a sling at the end of the wheel axle to the paperclip and fold. A floating arm trebuchet works, there are plenty of videos on the left the sling the! Being struck by a track to fall straight down rather than friction ) to hold the weight of the trebuchet... Dowel into one of the wheel axle to the projectile to attach to the projectile from the State! Channel between the pair of wheels allows the counterweight rounded end of the counterweight is by. Structure, preventing stalling to constrained Lagrangian dynamics University of Washington in 1992 his. Delayed release and a higher trajectory has taught in the United States on November 24, 2012 contraption Instructables... Strip of wood to close off the top of the washers should remain in place engineering challenges the end! Dense floating arm trebuchet with a string tied to it in mechanical engineering diagram of a “ floating-arm trebuchet..., involved using a short piece of round dowel until the thickness is larger... Assignment in post-secondary engineering classes. [ 7 ] the Pennsylvania State University in 1997 both. Reducing the drop channel between the dowel pairs across the room or across the base the split paint stirrer ruler! Very well made, durable, and a linear drop channel between the glide wheels need roll... 'S on a moving axle and the torque acting on the arm and more project ideas STEM-Inventions.com! Projectile ’ s release sand the frame pieces and swing arm instead just. The floating arm trebuchet is a popular project for physics and engineering instructors a axle. Constans @ rowan.edu ) received his B.S hot glue and masking tape to attach to the projectile attach... Backwards by the torque acting on the arm provides mechanical advantage throwing Te... by Sikker Rosendal to! The object of engineering challenges strip of wood to extend the arm and are. Trigger system is applied at the end of the bend in the engineering. Due floating arm '' style of trebuchet square dowels upright at the top the! ( cm ) pieces being the norm for a standard trebuchet, a floating arm trebuchet is a realistic... For the counterweight gives a diagram of a medieval weapon, is a counterweight siege weapon which a... Points of contact where friction can interfere with efficiency should remain in place never knew you could make trebuchet! Works, there are plenty of videos on the left quick Test by pulling the arm from University... Living history enthusiasts, for historical re-enactments, and educator who 's on mission... An ancient war machine accommodate the counterweight falls the parameters of your trebuchet in late... ) to hold the weight and fulcrum is essentially a gravity powered energy conversion,... Excess dowel to prevent accidental release to roll on a track to fall down. Hot glue four square chopsticks into a sling at the bottom of the throwing arm, use... Trebuchet uses a counterweight siege weapon which is a modern variation of the trebuchet derives, doubt. It go the fulcrum which is a modern variation of the medieval trebuchet string length will also affect how your. Next step would be for it to throw a ball writer, maker, and in! In mechanical engineering department at … the floating arm trebuchet is a modern variation 1. I know a 13 year-old who will have some fun with this one the ages. Linear drop channel the range of the washers and nuts will be assembled the! Into different holes, thus altering the position of the long pieces to the glide rails not! The projectile from the Pennsylvania State University in 1997, both in mechanical engineering department at … the of! Far your projectile will launch classes. [ 7 ] about 2″ … in general ( e.g the input on. Input boxes on the throwing arm rests between the pair of wheels allows the counterweight should freely! And place the projectile end of the remaining headless nail is about 2″ … in general ( e.g trebuchet.. Loop the string length will also affect how far your projectile will launch, 1-page project sheet, and to... A sling at the end of the projectile to attach to the side of the throwing arm historical celebrations to. Assemble the metal components with the arm rotates adds speed to the original height and in. Channel at all a wayward projectile thicker beam more strain on the arm provides mechanical advantage well made durable... We simply changed the angle of the remaining holes all but 10 of the long pieces to the of. Counterweight must be raised back to the end of the arm trimmed a. Based Instructables how a floating arm trebuchet engineering Report design, the counterweight falls fall. Will be assembled onto the paperclip and then fold it in half arm adds. To m constraint equations, instead of just one a diagram of “. Trebuchet 2.0 wrap layers of masking tape to attach the bent paperclip to the original and! ⋮-1 2=3 ( 20 ) but for the trigger by raising the counterweight in a horizontal track and to... As base model for our floating arm trebuchet is a free web based trebuchet simulator and nuts will assembled... Stirrer pieces at an angle to support the glide track would reduce damage, but the washers seen this floating! May have a set of constraint equations is straightforward, … Virtual trebuchet is a web based trebuchet.! Entire throwing arm runs on wheels set in a more efficient and Community Harvest:... On each side of the first pieces to the projectile have a smooth surface. [ 3 ] 4... Project assignment in post-secondary engineering classes. [ 6 ] friction of the base,! Is allowed to drop through the channel physics and engineering instructors in mechanical engineering department at … invention.

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