Where we saw wood splitting, we handmade braces out of metal to release some of the stress. We used a rectangle pin because it only has two points of contact. Students work in small groups to create a prototype. The pin's angle is an essential piece to your trebuchet. Candy Pumpkin Catapult: An Engineering Exploration of Levers and Force Created by Lesley Stranger Students utilize knowledge of levers and force to create catapult prototypes to help save a fictional town. Mount the last Eye Hook on the arm between the two you added to the frame. Mount 2 Eye Hooks to the center of the frame where the arm falls. With the chute, we diverted from the original blueprints due to time constraints and were happy with the end result as it allowed our arm to have more clearance on the wights we added, which in turn gave us more flexibility on our trebuhcet. but then made a few modifications to make it better. We also found adding grommets to the holes where our rope was tied to the sling, since the force tends to tear through it rather easily. We also recommend using 550 paracord since it has the best fitting characteristics to our project. We highly recommend this structural support.įor the sling we used a canvas bag material. We added support trusses where the support beams meet the 50'' bars to add even more support. After that we used both SolidWorks and a Virtual Trebuchet Simulator to test. With the brace's height's only limitation was our mitre saw's angle of 50º, we put brackets in the corners and we had a trebuchet frame.įor our design we used SolidWorks to build it virtually. ![]() The frame was built around that, we gave the length 2 6' 2x4's and the width 2 28" 2x4's. With a pivot height of 48" to the dot, we then put together an 8' arm with the pivot point placed in the spot we felt was the best after some math. Then we took into account the limitations the rules gave us and pushed everything to the limit. (It will be given references, before we turn it in.) Then the delving began, after much research, we finally found the information we needed to have the perfect trebuchet. We compared the abilities and mechanics of trebuchets to catapults at first, and we were convinced trebuchets were the way to go. From the beginning we had wanted to build a trebuchet, so that was the primary objective here. It was a very intense time, since we had so little of it. has a discussion on torsional bundles advice for rope.When we were first assigned this project we had to go through so many options and learn about so many new mechanics.we shoot pumpkins with the catapult and an air cannon from the field near the. Slide the stack of 5 craft sticks from earlier in between these 2 to make the catapult’s crossbar. Stack the stick with the bottle cap on top of the last craft stick and fasten them together with the last rubber band. Websites with Torsional Catapult suggestions: Because of a malfunction, one pumpkin went straight up in the air and the. Hot glue your plastic bottle cap to the end of one of the remaining sticks. ![]() Torsional Catapult Measuring for cuts on torsional catapult frame. And of course the classic craft stick catapults multiple times with younger kids.Families, friends and neighbors are getting together in their neighborhoods and at festivals to build and test out pumpkin catapults.This catapult allows you to decide how much power you want to put behind those pumpkins. See below for more on torsional catapults. Pumpkin chunkin' involves tossing pumpkins with catapults or trebuchets. Simple torsion design that uses 2×4′ s. ![]() ‘ Quick & Easy’ wooden catapult using 2×4’s.Catapults we’ve made The first group ‘Quick & Easy’ tabletop catapult test launch of a racquet ball. And if you need a sketchup for 3D work, you can download a copy for free if you select for personal use. This also may help us, an online trebuchet design/simulator tool. Should we add a floating arm to our trebuchet design? Check out this video – bowling ball warm-ups before the pumpkin launch!.6′ tall 2×4 design that should fit in a garage (needs new link).Ten foot tall trebuchet that uses mostly 4×4’s, claims a 6# rock 140′, but uses 220 lbs.We’re looking into a combination of one of these: There seems to be interest in doing a bigger catapult & we do have a lot of 4×4’s – will update this webpage with links & pictures as a plan develops.
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