Advanced Class in Traditional Wooden Boatbuilding

 

August 4, 2020:

For the last fifty years or more, Dolphin has had an iron bulb keel bolted to her underside as seen in the photo below. On the inside of the hull, a clumsily installed two by ten inch plank covered the original oak keel to help support the strain of the iron keel. Roy Cano (as a young man at the left of the old photo below) had told me that according to Ralph Flowers, instead of the iron keel, Dolphin had been built with a retractable centerboard.  The last communication that I had with Roy was on January 22, 2020, when he sent me this old photo of Dolphin with her old keel (Roy was discovered drowned in Sausalito on January 29). Earlier he had written that the iron keel was off as I had requested so that Dolphin could be more easily moved.  The other reason I wanted the iron keel off was to document whether or not Dolphin once had a centerboard.  With the iron keel off, we verified that Dolphin did indeed have a centerboard.  We measured the exact length and width of the original trunk.

 

 

The image below is of Dolphin’s construction drawing in profile where I have drawn in a centerboard with trunk as might have once existed.  With the board down as shown, Dolphin would draw three feet.  The old centerboard slot was two and a half inches wide indicating that her original centerboard must have been weighted.  To increase Dolphin’s stability, we could build the lower portion of the centerboard in lead which would add about seven hundred pounds of ballast where we most need it.

 Bob Darr

 

 

 

BELOW IS DOLPHIN’S BODY PLAN

JUNE 4, 2020: The above image is of Dolphin’s body plan.  The Advanced Class will prepare wooden molds of each section to be used in building the boat.

MAY 6, 2020: The photo to the right shows the first stage of Dolphin’s lofting, the transfer of hull shapes taken from the boat and reproduced as a full sized drawing of the boat in several two-dimensional views.  The profile, half-breadth, and body-plan views must all come into accord for the boat to be deemed properly “faired” and ready to build.

This is an avocational class for experienced woodworkers who want to broaden their knowledge of classical wooden boat design and traditional boatbuilding.  Weekly Thursdays sessions run from 9am to 1pm.  We are in the beginning stages of our latest historical project, lofting and preparing a set of lines taken from Dolphin (see description under Projects and Events).

Instructor: Bob Darr.

Tuition: $100 a month.  Experienced woodworkers may sign up at arqueschl@sbcglobal.net Before being accepted into the class, applicants must visit the school to introduce themselves.  Such introductions must be scheduled in advance online. They usually take place on Tuesdays and Thursdays between 11am and noon.  If the applicant is qualified for the class, we offer a free audit of the first session to help the applicant decided whether or not to take the class.  At this time, because of Covid-19, we only allow two students at this time in the class.  All must wear face masks and practice social distancing.