P13032 Adjustable Sailing Seat Timothy Slattery - ME Andrey Sulik - ME Derek Topper - ME Marion Paredes Pages ISE May 10, 2013 Project Overview Objective: o Redesign team P12031's Motion Assistive Seating Device for Sailing (Keith Burhans) Gold Medal Sailing Seat Motion Assistive Seating Device Specifications Primary customer needs: o Provide adjustability for multiple users o Provide adjustability for other Sonar boats o Increase safety o Increase mechanical advantage o Provide enough space for Jib Transfer Bench (P13031) Translated into engineering specifications
Engineering Specifications Engineering Specification # Importance*1 ES1 1 Source Specification CN1, CN11 Secure to Sonar with non-permanent attachments Unit of Measure Marginal Value Binary Ideal Value Yes ES2 ES3 1 1 CN2 CN3 Adjustable Foot Rests Seat Adjustment (up/down) in in 4< 1< ES4 1 CN4 Hand Crank Adjustment
in 4< ES5 ES6 1 1 CN5 CN6 Percentage Amplification of User Force Input Corrosion resistance % Binary ES7 ES8 1 1 CN7 CN8 Seat locks into position anywhere in travel Cost of components manufactured for MSD Binary $ ES9 ES10 1 1 CN9
CN10 Entire seating system is moved aft from previous iteration Minimum FOS of critical elements found via analysis ES11 ES12 1 1 CN13 CN14 ES13 ES14 1 2 ES15 ES16 3rev/ 90 Tiller 4rev/ 90 Tiller Yes Yes 3000> in # 0< 2 3< 3< Steps required to release rudder in emergency Degree of movement of rudder from centerline of boat
# degrees 3> 40< 1 90< CN14 CN22 Backlash in lines controlling rudder Grab handle(s) to assist seat movement in Binary 1> 0.5> Yes 2 2 CN17 CN18 Time required to attach or detach hands System has limited number of sharp corners or edges s # 30< 10> 15< 0 ES17
ES18 2 2 CN19 CN20 Pinch points created by track platform Steps required to release from harness # # 2> 3> 0 1 ES19 ES20 3 2 CN21 System fits multiple seats CN11, CN21 Time to fit system in SONAR sailboat # minutes 60> 2 30> ES21 ES22 2
2 CN11, CN21 Time to adjust system for new user CN24 Time to assemble system minutes minutes 60> 60> 30> 30> ES23 1 1 = most important CN3 Seat Adjusetment (fore/aft) in 3< Design: First Steps Functional decomposition Design: Concept Concept development iterations Two design proposals o Redesigned trackless system o Modified track system design (system constraints +
customer preference) Primary improvement goals: o Hand crank, seat position, and foot rest adjustability o Reduced impact on body when swinging from side to side o Mounting plate that can secure different seat shells o Adjustable platform handle locks to lock in place in different Sonar boats o Emergency quick-release system Final System Design: Adjustability Anthropometric analysis to determine amount of adjustability o Accommodate about 90% of the population Adjustability: Design Components Hand Crank Design Components Pedestal Base Design Components Track Platform Test Results Engineering
Specification Importance # *1 Specification ES1 1 Secure to Sonar with non-permanent attachments ES2 1 ES3 ES4 Unit of Measure Marginal Value Ideal Value Test Results Binary Yes Yes Adjustable Foot Rests in 4< 4" 1
Seat Adjustment (up/down) in 1< ~2.25" 1 Hand Crank Adjustment in 4< 4rev/ 90 Tiller 4" 4rev/ 90 Tiller ES5 1 Percentage Amplification of User Force Input ES6 1 Corrosion resistance Binary Yes Yes ES7
1 Seat locks into position anywhere in travel Binary Yes Yes ES8 1 $ 3000> ~3500 ES9 1 ES10 1 Cost of components manufactured for MSD Entire seating system is moved aft from previous iteration Minimum FOS of critical elements found via analysis ES11 1 ES12 1
Steps required to release rudder in emergency Degree of movement of rudder from centerline of boat Specification Achieved Specification Not Yet Verified % 3rev/ 90 Tiller in 0< 3< 3" # 2 3< 3 # 3> 1 1 degrees 40< 90<
Test Results Engineering Specification Importance # *1 Specification Unit of Measure Marginal Value in 1> ES13 1 Backlash in lines controlling rudder ES14 2 Grab handle(s) to assist seat movement ES15 2 s ES16 2 Time required to attach or detach hands System has limited number of sharp corners or
edges ES17 2 ES18 0.5> Yes Yes 30< 15< 0 sec. # 10> 0 Pinch points created by track platform # 2> 0 0 2 Steps required to release from harness # 3>
1 1 ES19 3 System fits multiple seats # ES20 2 Time to fit system in SONAR sailboat minutes 60> 30> 15 min. ES21 2 Time to adjust system for new user minutes 60> 30> 30 min. ES22
2 Time to assemble system minutes 60> 30> 30 min. ES23 1 Seat Adjusetment (fore/aft) 3< 2" Specification Achieved Specification Not Yet Verified Binary Ideal Value Test Results in 2 Success and Failure
System provides full range of adjustability o Foot rest angle (bonus!) System provides greater comfort to user o Corbeau seat o 5 point harness Quick release tiller System is expensive System should be made more robust o Removal of wooden components o Foot rests Many parts to manufacture Final System Future Work Provide adjustability for other popular sailing boats o Ideal 18 o Freedom 20 Increase system portability Provide ergonomic handcycling grips (30 tilt) Decrease total installation time Questions?
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