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 1 = most important Engineering Specification #Importance* 1 SourceSpecificationUnit of MeasureMarginal ValueIdeal Value ES11CN1, CN11Secure to Sonar with non-permanent attachmentsBinary Yes ES21CN2Adjustable Foot Restsin 4< ES31CN3Seat Adjustment (up/down)in 1< ES41CN4Hand Crank Adjustmentin 4< ES51CN5Percentage Amplification of User Force Input%3rev/ 90° Tiller 4rev/ 90° Tiller ES61CN6Corrosion resistanceBinary Yes ES71CN7Seat locks into position anywhere in travelBinary Yes ES81CN8Cost of components manufactured for MSD$ 3000> ES91CN9Entire seating system is moved aft from previous iterationin0<3< ES101CN10Minimum FOS of critical elements found via analysis#2≤3< ES111CN13Steps required to release rudder in emergency#3>1 ES121CN14Degree of movement of rudder from centerline of boatdegrees40<90< ES131CN14Backlash in lines controlling rudderin1>0.5> ES142CN22Grab handle(s) to assist seat movementBinary Yes ES152CN17Time required to attach or detach handss30<15< ES162CN18System has limited number of sharp corners or edges#10>0 ES172CN19Pinch points created by track platform#2>0 ES182CN20Steps required to release from harness#3>1 ES193CN21System fits multiple seats# 2≤ ES202CN11, CN21Time to fit system in SONAR sailboatminutes60>30> ES212CN11, CN21Time to adjust system for new userminutes60>30> ES222CN24Time to assemble systemminutes60>30> ES231CN3Seat 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 Unit of Measure Marginal ValueIdeal ValueTest Results ES11Secure to Sonar with non-permanent attachmentsBinary Yes ES21Adjustable Foot Restsin 4<4" ES31Seat Adjustment (up/down)in 1<~2.25" ES41Hand Crank Adjustmentin 4<4" ES51Percentage Amplification of User Force Input% 3rev/ 90° Tiller 4rev/ 90° Tiller ES61Corrosion resistanceBinary Yes ES71Seat locks into position anywhere in travelBinary Yes ES81Cost of components manufactured for MSD$ 3000> ~3500 ES91 Entire seating system is moved aft from previous iterationin0<3<3" ES101 Minimum FOS of critical elements found via analysis#2≤3<3 ES111Steps required to release rudder in emergency#3>11 ES121 Degree of movement of rudder from centerline of boatdegrees40<90< Specification Achieved Specification Not Yet Verified

Test Results Engineering Specification # Importance * 1 Specification Unit of Measure Marginal ValueIdeal ValueTest Results ES131Backlash in lines controlling rudderin1>0.5> ES142Grab handle(s) to assist seat movementBinary Yes ES152Time required to attach or detach handss30<15<0 sec. ES162 System has limited number of sharp corners or edges#10>0 ES172Pinch points created by track platform#2>00 ES182Steps required to release from harness#3>11 ES193System fits multiple seats# 2≤ ES202Time to fit system in SONAR sailboatminutes60>30>15 min. ES212Time to adjust system for new userminutes60>30>30 min. ES222Time to assemble systemminutes60>30>30 min. ES231Seat Adjusetment (fore/aft)in 3<2" Specification Achieved Specification Not Yet Verified

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?