Personally I always try the simplest/cheapest option first, such as this; "An end plate on a rudder gives it more power for its area; it's a cheat to make the board or rudder act as if it has a higher aspect ratio. The finished assembly looks like an upside down T. The winglet/plate should probably be at least 1.5 inches (units) on either side of the board."
I tried this on a monohull rudder I had previously that had a lot of weatherhelm. The main problem was sail balance but this easy fix definitely helped.
Doesn't take much to put it on and if you don't like it, its easy off.
Just my 2 cents
Carl.
--- In harryproa@yahoogrou
>
>
> I wouldn't argue against a leeboard, but if the rudders work, I'm not
> sure there's a good reason for the extra drag and complexity. The
> rudders will need to be built almost to the same strength and kick-up
> ability in either case.
>
> Was the change to beam-mounted rudders done to get a better kick-up
> mechanism, a stronger rudder system, or because steering was unbalanced
> when the boards were partially up? All three? If so, is it possible to
> get the same advantages by refining the design of hull-mounted rudders?
>
> Other than the Rare Bird failure, which was metallurgical and can be
> solved with beefier stainless or carbon, the reports on the hull-mounted
> rudders seem to be generally good. If that system can be improved upon
> with what has been learned with the different rudder designs up to this
> point, so much the better.
>
> As a result, Rob's and Robert's plans for hull-mounted rudders are
> growing on me. If they are far enough from the topsides to spin, kick
> up, and avoid squeezing water, that seems like a good approach.
>
> ---
>
> I'd definitely test deeper rudders, with good fairing and smooth
> paint, without a leeboard, just to see what happens.
>
> Just for kicks, I'd also try steering the front rudder the "wrong"
> way, i.e., the same direction as the rear rudder, when the rig is
> fully-powered. If that helps turn the boat, then we know that the CLR
> has moved forward of the front rudder. Which will reveal much about
> what needs to be done in terms of rudder placement.
>
> - Mike
> //
>
> / /
>
> Rob Denney wrote:
> >
> >
> > G'day,
> >
> >
> > Will be great to see how a leeboard works. Do you think the results
> > will be different from increasing the immersed portion of the rudders?
> >
> > regards,
> >
> > rob
> >
>
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