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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: - PowerPoint PPT Presentation
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P13031 - Jib Transfer Bench
Team Members: Mike Walsh, Nick Davis, Charley Kowalyshyn, Zeb Koch
Guides: Kate Leipold, Dr. DeBartolo
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.
Project Description
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
Concept Summary
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
Customer Needs Recap
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
Design Summary
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
System Architecture
Modeled on previous baseplate
Legs are bolted through metal plate underneath
Base clamps to bilge cover
Allows adjustability – forward and backward
Baseplate
Protects boat from interference with jib transfer bench
Provides surface to distribute any forces from system
Parts of purchase system mounted to these platforms
Side Seat Platforms
Pillow block and carriage provide linear motion on bar and track
Most expensive component in system
Heaviest component Most complex to
install
Bench
Durable lazy susan◦ Greased bearings◦ Rigid against torque
Provides enough friction for braking, but allows easy rotation too
Lazy Susan and Seat
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
Handholds
Mounted behind occupant. Travels the width of device
Designed to give a 3-1 advantage
Purchase System
Purchase System
Top of swivel stool used
Lap belt for support
Cindy’s System w/o Captain’s Chair
System moved forward on baseplate with front handhold used
Limits space for Cindy to move
Cindy’s System w/ Captain’s Chair
Bucket seat and 5-point harness provide support
Leg supports
Zak & Gary’s System
Test #
Metric Marginal Target
Technical Target
Test Result Pass/Fail?
1 Device Weight 100 lbs 50 lbs 125 lbs Fail2 Transfer Time 5 sec 3 sec 2.9 sec Pass3 Vertical
Translation3 in 0 in 0 in Pass
4 Product footprint
1000 in2 800 in2 1242 in2 Fail(flaw)
5 Mechanical Solution (IFDS Standards)
IFDS Standards
IFDS Standards
Pass, per Appendix B of IFDS Standards
Pass
6 Time to enter seat
4 min 2 min 40 sec
Pass Pass
7 Time to exit seat 4 min 2 min 40 sec
Pass Pass
8 Force to start movement
150 N (33.7 lbs)
120 N (27 lbs)
26 lbs (2-1) Pass
Testing Results
Test #
Metric Marginal Target
Technical
Target
Test Result Pass/Fail?
9 Weight capacity 220 lbs 265 lbs 270 lbs Pass10 Comfort 3 on a 0-5
scale5 on a 0-5 scale
~4 Pass
11 Installation time 10 min 5 min 5:49 w/o purchase systemApprox 8 minutes with (speed demons)
Pass
Flaw in spec
12 Transfer Distance
40 in 50 in 39 in FailFlaw in Spec
13 Salt Chamber 12 hrs 24 hrs n/a Resource unavailable
14 Product width 20 in 18 in 22.75 Fail
Testing Results (continued)
Test #
Metric Marginal Target
Technical Target
Test Result Pass/Fail?
15 Seat accepts customer’s cushion or one is provided
W 18x18 20x20 16” cushion provided
Pass
16 Weight at a 45° angle forward to test harness
220 lbs 265 lbs 180 lbs safely
Inadequate test equipment
17 Emergency release time to activate
3 seconds 1 second < 1 second Pass
18 Rotates in final position
10° 20° > 20° Pass
19 Clamping force to maintain position
186.6 lbs 192 lbs 330 lbs Pass
Testing Results (continued)
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
Evaluation: Success and Failure
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
Suggestions for Future Work
Questions, Comments?