The u-bolt should line up with the cross-brace, the winding catch should line up close to the winding "spool", and the firing pin catch should line up with the firing pin (this is a must). The holes should be a bit bigger than your carriage bolts, and will be used to hold the arm in place.Slide out the aluminum pipe, and slide it back on so that the Rotating Arm Holder is able to Rotate about it. Insert some holes in the longer ends, reinforcing them with grommets (metal) to stop tearing. Since you're drilling into fiberglass, you have to slowly step through all of the sizes of the bits, until you reach the final bit. Do not use a catapult to shoot hard things at people or animals. The first is located 1 in from the thickest end and the second is 10 in from that hole, heading towards the thinnest end. It depends on the force generated where the two popsicle sticks are joined by the rubber band. Beam Brace: Use the 7th set of 2 pieces of wood to measure as follows: Spacers: Use the 9th set of 2 pieces of wood and find washers to fit on them to hold them in place when so they can properly center the throwing arm. Try using different projectiles to see which will launch the farthest. A pouch is an essential ingredient, if you want to throw your dog a ball with a trebuchet. Ammunition: small marshmallows, beans, and pencil erasers are all great choices! please? Corner Leg 2: Copy the procedures for corner leg 1, creating a mirror image. on Introduction, the actual name for this is an "onager". Then, tie the other 2 sticks together at one end with a rubber band. Add a ton of padding to the cross brace - you'll need this if you don't want the catapult/arm to break. The cross-brace's top should be flush with the top of the two posts, and should be closer to the shorter side of the base of the frame. In 1480, Louis XI of France forbade the filling of tennis balls with chalk, sand, sawdust, or earth, and stated that they were to be made of good leather, well-stuffed with wool. Experiment with different sized craft sticks to make larger more powerful catapults. Experiment with different designs for your catapult projects. By using our site, you agree to our. You may also want to get a release style pin and put it at the top of the assembly or the bottom. Because if a hook is screwed in it, it seems like it would probably break out of it under the strain. the name was a donkey in old tongue. Basically, just weld the pipes together, putting about 2 inch welds every 4 inches or so. These weapons work like levers with the base acting as the fulcrum for the arm to pivot off of. Ping pong balls and grapes both work well with this catapult project. Science. To ensure a neat break, score the yardstick across its width using a utility knife. 1 6" length of wooden dowel, with a small enough diameter to fit through the straw. Counterweight: Drill 2 x 3/8in holes into the can, on opposite sides, near the top. Consider adding a second elastic band to the joint to make sure it is secure. Cut the third 2 pieces of wood to lengths of 34 in. Make your windings tight, but don't stretch it, just try and minimize slack. To create this article, 91 people, some anonymous, worked to edit and improve it over time. These can cause injury if used irresponsibly. on Step 3, 9 years ago 11 years ago Burning Laser How-To: Make a burning laser pointer | 2 different... How to Fart on Command – Takes just a minute to... 2 steel pipes, 1.58 in x ½ in diameter, with slip fit to go over the primary axle of 3/8 in, 1 ball of very strong brown twine, not packing variety, ¼ in round x 22 in x 1.17 in wooden molding, 2 pieces pole style wood ¾ in diameter x 1.58in, 1 x 6 in x 8ft x ¾ in wooden board without knots. Sorry about the run-onsScrew the not-welded part of the hinge into the back of the catapult so that the pipe is in the center of the back of the catapult. How would I do that still using these instructions? Make sure that the bolt is facing the opposite way that the u-bolt and eye bolts are facing (which should all be facing the same direction).Non-metallic Arm (fiberglass)You're going to need a drill press and a whole bunch of drill bits. Can I make a mini catapult out of toothpicks? If you want to build something like that, then you can use the same layout for this catapult but instead of Popsicle sticks, use 2 by 4s and in place of the rubber bands, use bungie cords. When its skein of cord is tightly twisted, the catapult I have described will hurl a round stone weighing 10 lbs. The more secure the attachment, the more spring you will get from your catapult. Cut and place a metal pipe into the holes, and leave a bit sticking out on each end - this will be the spool. Probably no more than 4-5 feet at the most, but you could build a stronger catapult that might shoot farther. Yes, "Project X" is finally here.Camera work done by [www.instructables.com/member/noahw noahw]Video editing done by [www.instructables.com/member/bofthem bofthem], Assemble the base of the frame first -Use 3" screws and don't forget to pre-drill. Yes, you can fire marshmallows with it, as long as they don't stick to the bottle cap. Play games with your catapult! This article has been viewed 231,704 times. A few feet in from the back of the catapult, on the upward sloping braces, drill a hole through each brace, so that a metal pipe can fit though the holes. wikiHow is a “wiki,” similar to Wikipedia, which means that many of our articles are co-written by multiple authors. why are all you people posting things about your pen15, and being black? Put a spacer on each end, the throwing arm, and another spacer. Excellent website where you can follow along as this guy constructs his own Trebuchet; lots of good pictures and would be very helpful to someone wanting to build one: Adjust it where you want for the distance you are trying to achieve. Create a second upright that is the mirror image of the first. A longer length will generally give a different equation: A longer arm would go further up than over. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/a\/ad\/Build-a-Basic-Catapult-Step-1.jpg\/v4-460px-Build-a-Basic-Catapult-Step-1.jpg","bigUrl":"\/images\/thumb\/a\/ad\/Build-a-Basic-Catapult-Step-1.jpg\/aid1187322-v4-728px-Build-a-Basic-Catapult-Step-1.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"