[Rhodes22-list] Sailing suggestion.

Hank hnw555 at gmail.com
Thu Apr 20 11:51:20 EDT 2006


Dave,

Mass below the water line doesn't have anything to do with hull speed
although total mass does.  The following links give some decent
explanations.  The first one helps explain why a rhodes 22 can exceed teh
theoritical hull speed.

http://www.antrimdesign.com/articles/hullspeed.html

http://www.sailnet.com/collections/articles/index.cfm?articleid=colgat006

This article is very technical.

http://www.dynagen.co.za/eugene/hulls/

Enjoy!

Hank

On 4/20/06, David Bradley <dwbrad at gmail.com> wrote:
>
> Bob, thanks.  I had thought that the hull speed formula assumed an
> "average"
> hull shape, and that one of the factors is the mass below the water line.
> By heeling a typical keel boat aren't you moving mass above the water
> line?
>
> Dave
>
>
> On 4/19/06, Bob Weber <ruba1811 at hotmail.com> wrote:
> >
> > Dave, Flat bottom = 18 foot of waterline
> > Healed bottom = 19 foot of waterline
> > Who Cares?
> > The limitation of your maximum speed is based on waterline - Longer
> boats
> > can go faster
> > Hull speed = Square root of the wateriine * 1.3 (51/2 kn) flat or
> 5.7heeled
> >
> > If you ever see sailors on the lee side of the boat using their weight
> to
> > heel the boat on light wind days that is the principle they are going
> > from.
> >
> > Bob Weber
> >
> >
> > >From: "David Bradley" <dwbrad at gmail.com>
> > >Reply-To: The Rhodes 22 mail list <rhodes22-list at rhodes22.org>
> > >To: "The Rhodes 22 mail list" <rhodes22-list at rhodes22.org>
> > >Subject: Re: [Rhodes22-list] Sailing suggestion.
> > >Date: Tue, 18 Apr 2006 23:34:11 +0100
> > >
> > >Bill, it sure makes sense to me, just in terms of physics.  Flat bottom
> =
> > >less friction.  Buried side = more friction.  Of course, I was a
> > marketing
> > >major so what the hell do I know about physics?
> > >
> > >Dave B.
> > >
> > >
> > >On 4/18/06, Peter Thorn <pthorn at nc.rr.com> wrote:
> > > >
> > > > Nope.  I agree with you Bill.
> > > >
> > > > PT
> > > >
> > > > ----- Original Message -----
> > > > From: "Bill Effros" <bill at effros.com>
> > > > To: "The Rhodes 22 mail list" <rhodes22-list at rhodes22.org>
> > > > Sent: Tuesday, April 18, 2006 11:48 AM
> > > > Subject: Re: [Rhodes22-list] Sailing suggestion.
> > > >
> > > >
> > > > > Jay believes me, but he may be the only one.
> > > > >
> > > > > Bill Effros
> > > > >
> > > > > R22RumRunner at aol.com wrote:
> > > > > > Bill,
> > > > > > Nobody on this lists believes you. A R22 does not sail fast
> flat.
> > It
> > > > > > requires about thirty degrees of heel to get the wind in the
> sails
> > >and
> > > > really  get
> > > > > > her moving. I'd like to see you sail flat in a 10 mph wind. It
> can
> > >be
> > > > done,  but
> > > > > > only by the faint of heart.
> > > > > >
> > > > > > Rummy
> > > > > > __________________________________________________
> > > > > > Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
> > > > > >
> > > > > >
> > > > > __________________________________________________
> > > > > Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
> > > >
> > > > __________________________________________________
> > > > Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
> > > >
> > >
> > >
> > >
> > >--
> > >David Bradley
> > >203.253.9973
> > >dwbrad at gmail.com
> > >__________________________________________________
> > >Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
> >
> >
> > __________________________________________________
> > Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
> >
>
>
>
> --
> David Bradley
> 203.253.9973
> dwbrad at gmail.com
> __________________________________________________
> Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
>


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