Subject: [harryproa] Re: sailing BD with leeboard
From: "robert" <cateran1949@yahoo.co.uk>
Date: 11/3/2009, 8:18 PM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 



> My biggest problem so far is in having to get up an sit on the
> opposite side of the cockpit. Call me lazy. It's true. I love to lazy
> sail when I'm not going fast. I'm still working on this problem.

,,,,,,,A seat pivoting on an arm off the pedestal

>
> In any case, messing with a leeboard on each shunt would be one task
> too many. The only way I could see it working is if it were a single
> symmetric retractable daggerboard build into an external trunk that
> kicks up without damaging the boat. Kind of like the existing
> hull-mounted rudders, but without the need to turn. But I don't know if
> that's possible.

That is how I envisaged the leeboard. A sprung single pin to hold a Speer section ogive in place in a depression on the lw hull.

My present understanding is that this would provide almost as much of the lw resistance as a centreboard on a cat without any adjustment on the shunt

>
> ---
>
> Hydro experts: would it be possible to go to symmetric rudders if a
> lot of the lee force is taken by a keel or daggerboard? Is it possible
> for a single symmetric daggerboard to provide the leeway resistance
> without having to be adjusted on each shunt?
>
> - Mike
>
> / /
>
> jjtctaylor wrote:
> >
> >
> > I have considered the same thing. Can't find anything retractable that I
> > would consider a long term propulsion rated device. Thus a permanent
> > sail drive install of either electrical or diesel inboard have survived
> > sufficient test of time. But we agree minikeel essential to protect
> > the drive
> > leg while addressing the leeway issue and rudder control.
> >
> > Electrical is nice as it could be applied in a mode to regen the
> > battery bank,
> > or run with very modest thrust as a motorsail. Motorsail is the method
> > most
> > commonly applied by electric propulsion as it takes some of the surge
> > out of
> > the puffs and minimizes the full drag impact of the prop. Also nice is
> > electric
> > is down ready to go with no warm up. Crisis knocks and the aux is
> > prepared to move you, now!
> >
> > But diesel would be OK too.
> >
> > Not sure the retract functionality is worth the cost or complexity.
> >
> > The necessity for leeway control does make the prospect for permanent
> > propulsion within the lee hull more appealing. Agree too with the
> > analysis that CLR is moving around needs to be better localized at all
> > points of sail. AS a cruiser I don't want another "thing" to be
> > managed on
> > every shunt.
> >
> > Now option #3 is saildrive for main aux, AND retractable electric bow
> > thruster for
> > maneuver, like swing thruster and others. Prices have dropped on those due
> > to competition. Then you can really have some fun.
> >
> > JT
> >
> >
> >
>

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