By: Mackenzie Yagodich, Vanessa Steber, AJ Knotts, and Sam Heck Slingshot Cannon By: Mackenzie Yagodich, Vanessa Steber, AJ Knotts, and Sam Heck EDSGN100 Project #2

Table Of Contents 3.1 Problem Statement 3.2 Specifications 4.0 Connectional Design 4.2 Charts and Calculations 5.0 Building Process and Detailed Design Summary 1.2 Gantt Chart References

3.1 Problem Statement To design a safe system of transporting 20-25 ml of a specific drink into a crowd of people which is both cost effective and portable.

3.2 Specifications Stakeholder Needs Specifications Our interviews concluded that: people would want this mechanism used at a sporting event. Use the crowd would want Gatorade shot to them during a sporting event. Sponsor the crowd would want about 8 oz of Gatorade to be shot at them. Amount of Liquid the crowd is concerned about their safety, and want the product that is getting shot to be well cushioned. Safe the mascot should be the one shooting the drinks into the crowd. Entertainment they would want some type of gun to shoot the drinks into the crowd. Mechanism they would not want to spend any more than $20 on this product Cost Effective they would want the person using the product to be able to easily shoot drinks into the crowd all throughout the arena. Portability they would want it to be able to be produced quickly with cheap but quality materials. Production

4.0 Conceptual Designs

4.2 Concept Screening- Table 2 Selection Criteria throwing a bottle into the crowd slingshot Slingshot Cannon catapult crossbow Cost Efficient p n Sustainable Safe Production Portability   Plus 2 1 3 Same 4 Minus Net -2 Rank Continue? no yes

4.2 Pairwise Comparisons- Table 3   Cost Efficient/ Profitable Sustainable Safe Production Portability Row Total Row Total/Total 1 1/3 1/5 2 4.53 0.11 3 1/2 6.70 0.16 5 21.00 0.50 3.03 0.07 Total 42

4.2 Weighted Selection Matrix- Table 4 Slingshot Slingshot Cannon Selection Criteria Weight Rank Weighted Score Cost Efficient 11% 5 0.55 4 0.44 Sustainable 16% 0.64 0.80 Safe 50% 3 1.50 2.00 Production 7% 0.35 0.21 Portability Total 3.84 4.09 2 1 Continue? No Yes

Calculations Conservation of Energy: Ui = Ki (1/2)(k)(x^2) = (1/2)(m)(v^2) (1/2)(2*3.7)(.584^2) = (1/2)(.096)(Vo^2) Vo = 5.13m/s   Umax = Ki (1/2)(m)(v^2) = mgh (1/2)(5.13^2) = (9.8)(h) h-max = 1.3m y = yo + vo(t) + (1/2)(a)(t^2) 1.34 = (5.13)(t) + (4.9)(t^2) t(horizontal) = 1.09s x = vt x = (5.13)(1.09) x = 5.6m

5.0 Building Process

5.0 Prototype Drawlings and Designs

Detailed Design Once we finished our concept screening and scoring charts, we decided to further our idea of a Slingshot Cannon. The Slingshot Cannon is built from a three inch PVC pipe which was 28 inches long. For the handle of the cannon we used a 1.5 inch PVC pipe with .75 inches in diameter holes near the top of the pipe. We put a metal zip tie through the holes of the handle and wrapped it around the 3 inch PVC to attach the parts together. We then Drilled 3 sets of holes in the 3 inch PVC pipe. One 2.75 inches from the front of the pipe on both sides, two 4 inches from the front, and two 7.5 inches from the front. All of the holes were .75 inches in diameter. Once we finished the barrel of the cannon, we started to construct the part of the gun that would launch the drinks. We used a 1.5 inch PVC pipe that was a foot long in length. We then drilled two holes near the top of the pipe that were .75 inches in diameter. We then threaded the exercise band through the holes in the launcher and then stuck the launcher into the barrel of the cannon. We then pulled the band through the holes that were 7.5 inches from the front, around the outside of the barrel and back into the holes that were 4 inches from the front of the barrel. Then we finally pulled the band out the final holes that were 2.75 inches from the front and tied both ends of the band together at the top of the cannon.

Summary Our prototype and design focuses on the launch and distribution of liquid refreshments to the audience at different sporting events. The device is designed to launch a contained liquid to different specified locations in the stands to provide entertainment and satisfaction to the viewers. Our design is very cost effective, safe, lightweight, portable, and easy to use. It is a great design for launching beverages into stadium stands. The effectiveness of our design was limited by time constraints in the design process and cost limitations. Our final design will look much cleaner, make use of a stronger launching band, and be even easier to use due to a handle grip and shoulder rest as opposed to PVC piping. Cost will not be an issue in retail production due to the seldom nature of production. Each stadium interested will only require one to two Slingshot Cannons, so the cost of mass production does not worry our design team. We hope that our design will provide an easy way to entertain and quench the thirst of sporting fans during events.

1.2 Gantt Chart- Table 1 Slingshot Cannon 2.0 12 days Mon 7/27/15 Task Name Duration Start Finish Slingshot Cannon 2.0 12 days Mon 7/27/15 Tue 8/11/15 Finishing Gantt Chart 2 days Tue 7/28/15 Problem Statement 3 days Thu 7/30/15 Survey Questions Wed 7/29/15 Fri 7/31/15 Survey People Mon 8/3/15 Tue 8/4/15 Measurements of the Stadium 1 day Specs Wed 8/5/15 Brainstorming Thu 8/6/15 Concept Screening Concept Scoring Pairwise Fri 8/7/15 Choosing a final design Finalizing calculations Sun 8/9/15 Purchasing materials Build of Prototype Testing Prototype 0.5 days Mon 8/10/15 Fix problems Competition Day Presentation

Refrences "Hemisphere Parachute Design (for Parafauna)." Hemisphere Parachute Design. N.p., n.d. Web. 10 Aug. 2015. "Model Rocket Parachute Descent Rate Calculator." Model Rocket Parachute Descent Rate Calculator. N.p., n.d. Web. 10 Aug. 2015. "Parachute Descent Calculations." Parachute Descent Calculations. N.p., n.d. Web. 10 Aug. 2015.

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