P14031: Jib Trimmer Transfer Bench

Build, Test, Document

Table of Contents

This page will document our process as we move through MSD II. The project team will include work-in-progress as well as the latest test results.

Build and Integrate

Iterative activities to validate functionality and performance at the sub-system and system level.

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Jib Transfer System 3D PDF (right click and select "save link as" to save PDF before viewing)

Complete Jib Transfer System CAD Files, SolidWorks format with drawings

Jib Transfer System STEP Assembly File

Manufacture & Assembly Instructions

In order for someone to build their own Jib Transfer System they will need:

If you are interested in accessing the files separately, they are available here:

Sonar Installation Instructions

After the device is built, it is simple to install and remove from the Sonar as needed:

Test Plans & Test Results

A completed list of Test Plans & Results are shown below

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P14031 Test Plans PDF

P14031 Test Plans Excel

The following are selected test plans that were easily documented and explained using photos or videos.

TP8 - User's Unobstructed Field of View

The following is a video of a team member sitting in the device while rotating in the device. The video shows the actual point of view that the user will experience while using the device in the Sonar

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TP13 - Degrees of Rotation

The user can rotate +/- 90 degrees from the centerline of the Sonar, which is 180 degrees of possible rotation. The image below shows the device in the locked positions on the port and starboard sides, each locked position is 90 degrees from the centerline. public/Build and Test/Test Photos/TP13.JPG

TP14 - Vertical Distance between Seat and Boom

One major concern was that the user's head would hit the boom during transfer. The vertical distance between the top of the device's seat (where the user is seated) and the bottom of the boom was measured at 34.5" during testing. This is within the specified acceptable range, so most users should not hit the boom during transfer. NOTE: Users should still use caution during transfer because there is still the potential for a collision with the boom!
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TP18 - Plywood Life Testing

During the Detailed Design Review in MSD I, there was some concern with the use of our braking mechanism and the plywood base. The team designed this plywood life test to determine how many rotations the plywood base could withstand before being compromised (compromised is defined as the plywood having a groove of 0.25" or deeper). The system is design for 13,500 cycles (5 sailing seasons). The pin was positioned 1.88" from the center of the wood (3.76" diameter circle) to maintain a tangential velocity of 2115 in/min. The test was run at 179RPM, so 13,500 cycles is 76 minutes:

The spring was compressed 1in to simulate 40lbs of force on the plywood

The spring was compressed 1in to simulate 40lbs of force on the plywood

A 5

A 5" x 5" piece of marine grade plywood was positioned in the lathe

The lathe was set to 179 RPM and run for 76 minutes (every 5 minutes the direction was changed between CW and CCW

The lathe was set to 179 RPM and run for 76 minutes (every 5 minutes the direction was changed between CW and CCW

After 76 minutes the groove depth was 0.12

After 76 minutes the groove depth was 0.12" which is less than the failure point of 0.25"

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