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Dark Harbor 
(Aluminum Version Redesign)

 To promote 'Bezier Design and Construction' True Round  steel and aluminum boat building's method I will be redesigning Dark Harbor a classic design for aluminum construction in Real Time, well (My Real Time.)

The Reader will be able follow along the redesign and submit Comments to metalsailboats.com using the contact form at the end of each chapter in the redesign of Dark Harbor.

It is not the objective of this redesign to create a replica of the orginial design but to bring the classic appeal of Dark Harbor into the 21st century with the addition of a propulsion system, Toilet, electonics, enhanced companionway hatch design and a 7/8 fractional rig. while keeping classic charm of the orginial design as shown in Dark Harbor's gaff rigged sail-plan below.

It is also not the intent of the redesign of Dark Harbor for aluminum construction to have the same feel of the orginial design.  How would I know that feel, since I have never sailed Dark Harbor to know.

To create that Feel, I will first create a computer model from the of the orginial designs Lines drawing and Table of Offsets using the popular marine design software package - Multisurf,

Since a typical set of plans does not included much of the Engineering Data, I will calculate all the Engineering data for the original  design and enter that information into a 'Velocity Prediction' an addon to Multisurf to evaluate the orginial Dark Harbor design.  This data will create a Benchmark from which to compare the redesign Version of Dark Harbor. 

In the end the feel of the two version will be felt by the results of a Speed Prediction program.

A rendering  of the computer model for Dark Harbor is shown below.  Followed by the static hydrostatics. 

Static Hydrostatics

(Computer Model for Dark Harbor)

The follow data was taken from 'SailboatData.com'

(It is included here to verify the accuracy of the Computer Model created of 'Dark Harbor')

You can compare the the 'Static Hydrostatic' calculated for the computer model created for Dark Harbor to the information given at SailbatData.com for:

• Displacement
• Design Waterline length
• Maximum Draft
• Length Overall
• Displacement / Length Ratio
• Displacement / Ballast Ratio

(You will find the Computer Model created is spot on!)

I think that the proceeding  is a good point to start a conversation on bringing Dark Harbor into the 21st century.

I am looking forward to having fun with this redesign and your comments - Good or Bad.  Your comments will help direct me in the many decision that I will need to make the 21st century version of Dark Harbor viable.

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