1. 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

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

4. 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

5. 4.0 Conceptual Designs

6. 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

7. 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

8. 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

9. 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

10. 5.0 Building Process

11. 5.0 Prototype Drawlings and Designs

12. 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.

13. 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.

14. 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

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

16. Any Questions?