Original Dark Harbor
VCG Calculations


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Dark Harbor Center of Gravity Calculations

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The location of the 'Vertical Center of Gravity' is one of the primary factors in Sizing the Sail-plan, Sizing the Mast Column, Calculating the Dynamic Stability Calculations, and Velocity Prediction Calculation that will ultimately determine the success of the Redesigned version of Dark Harbor for aluminum construction. 

Since I cannot find the 'Vertical Center of Gravity' anywhere on the four sheets of Construction Plans, looks like I will be doing a weight study  for the original Dark Harbor design.  I could estimate it at two or three inches below the Design Waterline.  Estimating this most important calculation would not set well with me and  defeat the whole purpose of this writing.

The 'Weight Study'  to determine the 'Center's of Gravity' will be based on the information I have on hand, being the Construction and Sail-plan drawings, the Specifications, and the Computer Model file. 

No interior features will be included in the 'Weight Study', since the Plans I am working from did not include any Interior plan and profile drawings.  However, at this point I am not to concerned.  The interior of 'Dark Harbor' was probably minimal anyway! 

When the Weight Study for the aluminum version is calculated I will not include any interior structures for a fair comparison.

I expect the modern day version of 'Dark Harbor' to be heaiver with the addition of an power plant, fuel, and other comforts found in todays craft.

Remember,

We are only at the beginning of the Re-design process.


Constructions Plans

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Construction Scantlings

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Go to Dark Harbor Links

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New - Ongoing

The redesign of the classic sailboat Dark Harbor for Aluminum construction

Updated - June 22 2025

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Go to Dark Harbor Redesign



Steel and Aluminum True Round Plans

Click Here for Plans


Demystifying the weight factor

By way of a VPP Race between two versions of 'Lighting Strike' (One steel and the other Aluminum)

The weight factor Demystifed

Go to Lighting Strike's Velocity Predictions


How to layout and fabricate Hull Intergrals

Fabricating Hull Intergrals such as a Hatch Coaming is the next stage of boat construction.

The below pics is an initial dimensioned hand sketch - The first step in the layout process.


Click here to continue the process.


English Wheeling

This is not your Father's 'English Wheeling' method.

See how the 'True Round' shell platting is reduced to a flat pattern. These Flat Patterns take the mystic out of English Wheeling.


Click Here for Details



Converting an existing Hard Chine Design to a True Round Design

Followed by a Race via a 'Velocity Prediction Program.

Click Here

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The top pic is the orginal design - The bottom pic is the converted True Round version.

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