I've done tons of that myself. CHAINPLATES are a huge source of deckwater
entry. Pull the deck plates the chain plates go through and cake polysulfide
on both sides. My sternlight was another big problem. I've been removing
unnecessary hardware myself and epoxying the holes for the same reason.
> Would you be so kind as to send me via email a copy of your
> sketch for your
> "high aspect ratio" rudder blade. I'm more conversant with "high aspect"
> sails than blades and would like to see how you define the curve
> of the blade.
> What's the math? I'm also interested in where you propose
> putting the tiller
> swing bolt for the 270 swing.
Math? :) My 'analysis' of this is basically 'tall and skinny', maybe a
little less area than the stock rudder, with a tip curved in an elliptical
fashion. Cross section would be your typical symmetrical airfoil shape, as
thin as possible while retaining strength. Several books I've read (Art and
Science of Sails, by Tom Whidden i think was one) described this tip shape
as the shape causing the least amount of induced drag, and that
cross-sectional profile as having the most lift and least form drag. I think
the P19 daggerboard could benefit from such treatment as well. I don't think
we need to go into mathematical precision on a boat with the general lines
of a Dove bar, but since you gotta shape a new rudder like >something<, i
figure this theoretical optimal shape would be best.
The hydrodynamic flow around the keel and rudder is arguably as important as
the aerodynamic flow around sails, particularly to windward. fortunately,
the math for both hydrodynamics and aerodynamics at sailing speeds is
essentially the same since air doesn't compress at the speeds and pressures
we encounter in sailing.
I will draw you a sketch and email my idea for the fold-back tiller. It will
be obvious once you see a picture, but hard to describe. The goal here is
easy stowability. My kickup rudder takes an obscene amount of space to stow
when the tiller is attached.
> With your permission, I'll put the sketches up on my website for
> all to see.
No problem..