1. The Four-legged Water Walker
EDSGN 100 Sect. 007
Team 1:
Sarah Chomos, Page Barnett, Jess Maciejewski, and Wenjing Wu
Date of Submission: 03/04/16
Image 1. Final prototype

2. Table of Contents: Mission Statement
Stakeholder Needs & Specifications
Design Generation
Initial Comparison & Analysis of Design Ideas
Design Generation and Construction
Results of Testing and Modifications
Calculations
Summary
Questions

3. Mission Statement
Our mission is to capitalize on an opportunity to design and market a device that allows for college-aged individuals to walk on water and transport a maximum amount of weight.

4. To create an appealing product for the market, a survey was created to gather information about consumers.
How tall are you?
How much do you weigh? (lbs)
5’0”-5’11”
lbs
Chart 1. Consumer heights.
Chart 2. Consumer weights.

5. To create an appealing product for the market, a survey was created to gather information about consumers.
What price are you willing to pay?
Which attribute is most important to you?
$51-100
Safety $
Chart 3. Consumer willingness to pay.
Chart 4. Consumer evaluation of important attributes.

6. Based on the survey results, attributes were comparatively ranked in importance.
Table 1. Pairwise Comparison

7. Design specifications were produced from stakeholder needs.
The device should be safe.
Failure of prototype will present minimal risk of injury to the user or damage to the pool.
The device should be durable.
The prototype should be capable of a test run, a real run, and should be capable of performing for 5 years when used twice a week.
The device should be user friendly.
The prototype will cause no strain to the user and should take less than 10 minutes for the user to put on and begin using. Additionally the prototype will stay on the user’s feet while in use.
The device should be cost efficient.
The cost of manufacture of this prototype should be less than $150.
Table 2. Specifications & Customer Needs Assessment

8. Stakeholder Need Assessment Specification
The device should be good looking.
The prototype should be as aesthetically pleasing as possible without compromising any other specification.
The device should be sustainable.
The prototype will be environmentally friendly, built from recycled materials, and containing materials that can be reused and/or recycled.
The device should be easy to manufacture.
The prototype will be able to be assembled with minimal equipment and with common materials
The device should be portable.
The prototype will fit in the trunk of a car and carried with minimal effort.
Table 3. Specifications & Customer Needs Assessment

9. Our team generated concepts and brainstormed ideas based on stakeholder needs and specifications.
Figure 3. Tread Design
Figure 1. Block Design
Figure 2. Noodle Design

10. Our team generated concepts and brainstormed ideas based on stakeholder needs and specifications.
Figure 4. Bowl Design.
Figure 5. Ski Design

11. Matrices comparing the design ideas allowed for systematic choosing of which designs to continue.
Table 4. Screening Matrix

12. A weighted matrix further considered the remaining design ideas, ranking them from best to worst.
Table 5. Weighted Matrix

13. After assessing specifications for the ideas and recognizing pros and cons, the team chose to move forward with the number one ranked design.
Note: Scale: 1 block = 2 inches
Figure 6. Continued block design

14. After the start of construction of the original design, a new design--incorporating the arms and legs--emerged from the frame of the original.
NOTE:
Each isometric drawing to the left was constructed twice--one for each leg and arm.
The four separate pieces were conjoined by ropes.
Figure 7. Leg & Foot Piece
Figure 8. Arm & Hand Piece

15. The team constructed a prototype, tested it under final testing conditions, and made adjustments needed to optimize functionality.
Prototype after modifications
Prototype before modifications
Image 2. Prototype before modifications.
Image 3. Prototype with modifications.

16. The cost of our design materials was $121.89.
Pool Noodles (1): $ ” long
Foam Boards (2): $ in x 4ft x 8ft
Duct tape (3): $24.35
PVC Pipes (2): $ ” x 5ft
PVC Connectors: $ Tees and Elbows for 1.5” diameter pipes
Rope: $ ft
Total: $121.89

17. To calculate the depth of our device in water we used this equation.
Equation used to calculate depth:
d = depth in water
m = mass of device + person + extra weight
p = density of pure water (1000 kg/m^3)
A = Area of the device (Length * Width)

18. We utilized an Excel spreadsheet to see how the depth changed with different dimensions
First:
Table 6. Calculated dimensions.
Second:
Table 7. Calculated dimensions

19. Our design changed to two individually moving parts that held different amounts of weight.
Buoyant Force
Buoyant Force
Center of Mass
Center of Mass
Force of Gravity
Force of Gravity
30% of Weight
70% of Weight
Figure 9. Free Body Diagram of relevant forces.

20. To account for weight distribution we used different weight inputs.
Leg Device:
Arm Device:
Table 8. Calculated dimensions for leg device
Table 9. Calculated dimensions for arm device

21. The utilization of a Gantt chart allowed for efficient project management throughout the design process.
Table 10. Gantt chart.

22. Video of Trial Runs

23. Summary

24. Questions