156A Week 9

Overview of Status of Analysis, Design, Fabrication, Tests, etc.

Garrett’s

● Stingrays regrow barbs if they dislodge or get old

● https://youtu.be/zGcm_JSdCrY

○ Testing the Level IIA Kevlar against various knives. Knives used are the Opinel Eff 12 knife, AKM bayonet knife, Mtech Marine knife and the Lee Enfield Spike bayonet.

○ Kevlar 2a protects against many small bullets and would be used in a bullet proof “shirt” so it is likely to have the flexibility we need to make a shoe

● Woven carbon fiber?

● Numerical result of sting force:

https://www.brianchernicky.com/stingray-resistant-surf-booties/

Ho Wong 's

Accomplishments from Previous Week

● Brainstorming stingray sting deterrents, we have come down to two main paths with multiple routes:

○ Water Shoe:

■ Needs more research into puncture-resistant materials

■ Kevlar?

○ Stingray Repellant:

■ Stingrays can hear, see, and sense electrical (magnetic) fields, meaning there may be possible routes of repelling stingrays altogether

■ Our “Wow” design would be a simple yet effective deterrent, as it protects both the user and the stingray

● Material setup involves a testing setup with stingray barbs as

Figure below.

Goals for Next Week (list names after each item). Use specific and measurable objectives.

● Contacting those who have access to stingrays/stingray experts (Scripps) (Garrett’s and Miles)

○ Catching stingrays to test repellent methods if that option does not pan out (Jordan and Garrett)

● Continue brainstorming more possible methods to avoid stingray stings, becoming more specific (Ho)

● Building the puncture test setup (Garrett’s and Miles)

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments

● Focus less on the marketability of deterrents (advice is taken already, last on our list of concerns)

Instructor Comments from Last Meeting and Actions Taken to Address these Comments

● Focus less on the marketability of deterrents (advice is taken already, last on our list of concerns)

Risks and Areas of Concern (i.e. show stoppers)

● Lack of information/tests regarding methods for deterring stingrays

● Being able to find stingrays to test repellents on

○ Being able to catch stingrays during this time of year

○ Captive stingrays not easily accessed

● Some of the best materials for a water shoe may be difficult to acquire and/or work with

Risk reduction and milestone

●Settle on a design and perform puncture tests

●Regularly redesigning and performing puncture tests to improve design

●Perform design test with stingrays

●keep trying to catch stingrays

Budget (list amount spent and amount remaining)

amount spent $0

amount remaining $1000

Week 9 presentation slides and progress report