[Rhodes22-list] Rudder angle, tacking, and racing

[Richard Smith]

>From a hydrodynamic standpoint all that raking the rudder blade aft would
accomplish is to increase the apparent chord of the blade (assuming that the
water flow is more or less parallel with the water surface. ) This would
increase the Reynolds # (good) but lower the camber to chord ratio (not good
for slow speeds).

In my opinion it is much more important to trim your boat for a natural
helm.  This will avoid the drag caused by continually correcting weather or
lee helm.

Richard Smith

----- Original Message ----- 
From: "Robert Skinner" <robert at squirrelhaven.com>
To: "The Rhodes 22 mail list" <rhodes22-list at rhodes22.org>
Sent: Wednesday, November 14, 2007 8:47 PM
Subject: [Rhodes22-list] Rudder angle, tacking, and racing


> When you angle the rudder aft, it has the effect
> of changing the foil shape to one more efficient
> for slower speeds.  This reduces the stall speed
> of the rudder just as a flap does on an airplane
> wing.
>
> So, to check this theory while racing, lift the
> rudder when tacking, but lower it when running
> free or in strong wind.
>
> When on a beam reach, having the rudder aligned
> with the axis of the gudgeons will reduce tiller
> effort if the sails are not balanced, or if you
> get a great gust with a weather helm.
>
> Betcha you will go faster.  Let me know - I'm
> out of the water 'til spring.
>
> /Robert
> --------------------------------------------------
> Leland wrote:
> >
> > Jb,
> >
> > First of all, great pictures.  Your boat is beautiful and your pictures
of
> > the regatta reminded me that Annapolis isn't the only place to see a
bunch
> > of sailboats.  Catch that fish off of your Rhodes?
> >
> > I never thought about lifting the rudder to reduce drag on a tack.
Although
> > it makes sense, I probably won't do it just out of pure laziness.  Is
this a
> > common technique with the racing crowd?
> >
> > Lee
> > 1986 Rhodes22  At Ease
> > Crab Alley (Kent Island, MD)
> >
> > Just bent wrote:
> > >
> > > I did that on purpose so when I throw the tiller over to tack, it
doesn't
> > > put on the brakes as much, but still turns.
> > > Jb
> > >
> > >
> > > Rob Lowe wrote:
> > >>
> > >> Just bent,
> > >> Just finished looking at your photos (thanks).  Noticed the position
of
> > >> your
> > >> rudder.  It appears not to be down all the way.   Is there some sort
or a
> > >> "down haul" that pulls the rudder down into a vertical position?  Try
it
> > >> and
> > >> see if your maneuvering improves. - rob
> > >>
> > >> Rob Lowe
> > >> S/V Getaway
> > >>
> > >> ----- Original Message -----
> > >> From: "Just bent" <j.bulfer at jbtek.com>
> > >> To: <rhodes22-list at rhodes22.org>
> > >> Sent: Saturday, November 10, 2007 11:39 PM
> > >> Subject: [Rhodes22-list] new boat position
> > >>
> > >>
> > >>>
> > >>> I moved my boat about 12" forward on the trailer. It towed much
better.
> > >> I'll
> > >>> check the weight tomorrow.
> > >>> Lots of sailors out today. New pics on the ftp site.
> > >>>
> > >>> ftp://ftp.jbtek.com/pub/
> > >>>
> > >>> Jbulfer
> > >>> "Just bent"
> > >>> http://www.nabble.com/file/p13688442/DSC00958.jpeg
> > >>> http://www.nabble.com/file/p13688442/DSC00928.jpeg
> > >>> --
> > >>> View this message in context:
> > >> http://www.nabble.com/new-boat-position-tf4784775.html#a13688442
> > >>> Sent from the Rhodes 22 mailing list archive at Nabble.com.
> > >>>
> > >>> __________________________________________________
> > >>> Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
> > >>
> > >>
> > >> __________________________________________________
> > >> Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
> > >>
> > >>
> > >
> > >
> >
> > --
> > View this message in context:
http://www.nabble.com/new-boat-position-tf4784775.html#a13746323
> > Sent from the Rhodes 22 mailing list archive at Nabble.com.
> >
> > __________________________________________________
> > Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
>
> -- 
> Robert Skinner  "Squirrel Haven"
> Gorham, Maine         04038-1331
> s/v "Little Dipper" & "Edith P."
> __________________________________________________
> Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list