27460Re: Twin Leeboards
- Apr 5, 2013Jim drew a design called "Eisbox" that had a bow centreboard installed
in the free-flooding bow well as an option. There is a cartoon in the
The idea was to lower it enough in shallow water to help prevent lee
helm as the leeboard was raised. Very simple to add as you don't have to
worry about sealing the case since it is already inside the
free-flooding well, so it can be a very shallow rectangular box open at
the top. The board is in the shape of a quarter circle about 18" in
diameter. Just needs some weight added so it stays down and a control
line leads from a tab added to the aft end leading up to a turning block
at the bow and then back to the helm to raise it to the desired height
and locked into a jam cleat.
Eisbox has a 5 ft. deep leeboard so as it is raised in shallows will
quite likely introduce lee helm and spoil upwind capability. So as the
leeboard is raised you lower the bow board and hopefully maintain a
neutral balance at the helm by adjusting both boards as you go along.
The only thing is that you are restricted to 6" draft on Eisbox as it
has a skeg ahead of the inboard rudder to protect it - which Jim doesn't
like all that much - but the fellow who commissioned it insisted on as
he wanted the OB to be mounted on the centreline. It was intended to
motor more than sail in the purpose he wanted a boat for. He wanted to
motor out offshore to fish when the winds were normally too low to sail
and sail back home when the on-shore breeze arose in the afternoon.
So a fellow like JIB might be interested in this information if used in
hull with less draft than Eisbox and likes to sail in the shallows?
--- In Michalak@yahoogroups.com, "John Trussell" <jtrussell2@...> wrote:
> I had a Dovekie with a bow centerboard. It worked fine in shallow
> somewhat offset the lee helm which developed when I reefed. However,
> are in the habit of heading up in a puff, be aware that the bow
> will resist heading up-best to ease the sheet.
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