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Pete McCrary

Core Sound 20 Mk 3 -- #4 "Chessie" . .

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Pete, Nice job on all your boat alterations! I'm particularly interested in your OBM and motor well/mount. I've read and studied your pictures and plan to build something similar.  I haven't purchased an outboard for my CS  20 MK3 yet, I was hoping to get by with an electric trolling motor since I'm not fond of the noise and mess of gas. But I am coming to the realization that if I'm going to venture into near coastal waters and safely navigate high currents and shipping traffic I will need to be able to maneuver when the winds die. 

 

I am at the stage in my build just prior to installing the hatches and stringer material for the cockpit seating and I wanted to get my motor well mounted, my telescoping Garlick ladder mounted and backing supports for my eventual windvane. 

 

Therefore I will need to purchase an adequate outboard.  I was wondering if your OB was a Suzuki 4 or 5 hp ? I think they are basically the same overall dimensions? And if so does it fit and store inside your cockpit locker? I think I remember you saying it was a short shaft 15"? Is the wash plate below your transom? What are the dimensions of your well and height of OB mount above transom? 

 

Thanks, Mark 

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Chessie's Reboarding Ladder is finished, installed, and in-the-shop tested.  Here's what it looks like.

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Stowed.

 

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Deployed.  Notice that I followed Paul's advice and applied "no-skid" to both steps.

 

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Left foot on bottom step -- torso mostly under water.  Ready to raise up.

 

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Raising torso out of the water.  When in-the-water I might have to use both feet on the bottom step.

 

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Left leg fully extended and torso completely out of the water.

 

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Left foot just off the bottom step ready to raise it all the way up and over the transom.

 

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Almost there.

 

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Approximate force diagram for just one side of the ladder.  I consider 116 lbs sheer stress on the hinge is modest and will not be a problem for the strap hinge (well bedded) with #12 X 1" SS FHWS.  For the dry-fit I used 3/16" line.  It felt inadequate for the full 200 lb weight.  I went with 1/4" -- and it feels much more stable with less stretch.

 

Complete on-the-water testing at the end of the month.

 

 

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Thanks for documenting the design and the test. The angle away from the transom adds so much to the ease of use.

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I'm all in on that free body diagram and your slide rule!  I was in about the last class in high school to use slide rules before scientific calculators became reasonable.  Yours is much nicer than my student rule.  

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