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

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

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.

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” 131-160 lbs Chart 1. Consumer heights. Chart 2. Consumer weights.

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 $101-150 Chart 3. Consumer willingness to pay. Chart 4. Consumer evaluation of important attributes.

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

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

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

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

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

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

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

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

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

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.

The cost of our design materials was $121.89. Pool Noodles (1): $3.25 47” long Foam Boards (2): $69.96 2in x 4ft x 8ft Duct tape (3): $24.35 PVC Pipes (2): $8.94 1.5” x 5ft PVC Connectors: $12.90 Tees and Elbows for 1.5” diameter pipes Rope: $2.49 60ft Total: $121.89

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)

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

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.

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

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

Video of Trial Runs https://www.youtube.com/watch?v=OvhQZxtNbq0

Summary

Questions