P13031 jib transfer bench
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P13031 - Jib Transfer Bench. Team Members: Mike Walsh, Nick Davis, Charley Kowalyshyn , Zeb Koch Guides: Kate Leipold , Dr. DeBartolo. Project Description. Project Motivation: To provide an expanded and enhanced sailing experience for sailors with varying disabilities Project Goal:

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P13031 jib transfer bench

P13031 - Jib Transfer Bench

Team Members: Mike Walsh, Nick Davis,

Charley Kowalyshyn, Zeb Koch

Guides: Kate Leipold, Dr. DeBartolo

Project description
Project Description

Project Motivation:

  • To provide an expanded and enhanced sailing experience for sailors with varying disabilities

    Project Goal:

  • To design a mechanical solution to move a jib trimmer from side to side on a Sonar class sailboat, allowing them to function as a member of the crew.

Concept summary
Concept Summary

  • Concept heavily influenced by space constraint required due to Captain’s Chair

    • 23”front to back available

    • Cantilevered design fit best in space constraint

  • Rotational and translational movement required for jib trimmer

Customer needs recap
Customer Needs Recap

  • Gary & Zak

    • No leg mobility / core support

    • Desires to be fully secured

  • Cindy

    • Partial leg & core strength

    • Desires freedom to exit seat when necessary

    • Limited footprint available due to P13032’s chair

      • Cindy needs the option to sail with Gold Medal Chair or as a standalone device

Design summary
Design Summary

  • Two systems were to be built, requiring a comprehensive design to fit varying needs

  • Cantilevered seat – most viable option to fulfill needs at expense of weight, time and money

System architecture
System Architecture

  • Main components:

    • Baseplate platform

    • Side seat platforms

    • Bench

    • Lazy susan

    • Seat

    • Purchase system

    • Handholds

  • Points of contact with the boat are:

    • Baseplate, side seat platforms, handholds, purchase system


  • Modeled on previous baseplate

  • Legs are bolted through metal plate underneath

  • Base clamps to bilge cover

  • Allows adjustability – forward and backward

Side seat platforms
Side Seat Platforms

  • Protects boat from interference with jib transfer bench

  • Provides surface to distribute any forces from system

  • Parts of purchase system mounted to these platforms


  • Pillow block and carriage provide linear motion on bar and track

  • Most expensive component in system

  • Heaviest component

  • Most complex to install

Lazy susan and seat
Lazy Susan and Seat

  • Durable lazy susan

    • Greased bearings

    • Rigid against torque

  • Provides enough friction for braking, but allows easy rotation too


  • Provide adjustability to any Sonar handhold

    • Slides along 80/20 in X-Direction

    • 80/20 design allows for rotation to perfect angle

    • Slots in plates allow for extension into handhold cups

    • Turnbuckle gives max adjustability and security

Purchase system
Purchase System

  • Mounted behind occupant. Travels the width of device

  • Designed to give a 3-1 advantage

Cindy s system w o captain s chair
Cindy’s System w/o Captain’s Chair

  • Top of swivel stool used

  • Lap belt for support

Cindy s system w captain s chair
Cindy’s System w/ Captain’s Chair

  • System moved forward on baseplate with front handhold used

  • Limits space for Cindy to move

Zak gary s system
Zak & Gary’s System

  • Bucket seat and 5-point harness provide support

  • Leg supports

Evaluation success and failure
Evaluation: Success and Failure

  • System is overweight

    • Had to be robust due to space limitation

  • System is expensive

  • System is unable to be manufactured on a large scale in its current design

  • Some specifications are not feasible

  • Adjusting for multiple configurations is time consuming

Suggestions for future work
Suggestions for Future Work

Zeb worked on the PRP to iterate this project again in the 2014 school year

  • Eliminate space constraint due to Captain’s Chair

  • Reduce weight

  • Reduce cost

  • More off-the-shelf parts

  • Less machining

  • Better corrosion resistance

  • Re-evaluate specs

  • Evaluate feedback on rotation – if it needs a brake mechanism