[Rhodes22-list] keels- is there a difference?
David Walker
david.walker5 at comcast.net
Fri Jul 16 11:26:45 EDT 2004
Roger,
I really don't know whether I have the diamond board or not (recycled 90,
purchased in 98) but after two seasons I converted from a standsrd main and
150 genoa, to the IMF main and 175. The mast step stayed put. I can't say
that I have noticed any significant lee helm.
With the jib and main full out the boat balances extremely well until it
heels enough that hull form causes weather helm (which is a good thing).
The wind velocity to reach this point is obviously depenedent on number
crew. Then one reefs the jib first, then the main to keep balance.
I have obviusly noticed that performance was degraded slightly with the
change, and tacking is a little more difficult, although for the type of
sailing I do the compromise was worth it.
Dave Walker
----- Original Message -----
From: "Roger Pihlaja" <cen09402 at centurytel.net>
To: "The Rhodes 22 mail list" <rhodes22-list at rhodes22.org>
Sent: Thursday, July 15, 2004 10:32 PM
Subject: [Rhodes22-list] keels- is there a difference?
> Todd,
>
> After writing my response to Roger Brown in the UK & studying the diamond
> board pictures on the GBI website, I have my own question for Stan & the
> list. The design of the diamond board looks to me like it would move the
> Center of Resistance (CR) of the keel aft relative to the position of the
CR
> with the early centerboard. All else being equal, moving the CR aft tends
> to cause lee helm. The diamond boards are being installed on the newer
> boats that tend to come equipped with the 175% genoa and the IMF mainsail.
> The IMF mainsail has about 10 square feet less area than the standard
> mainsail. It is my understanding that the missing sail area was all taken
> from the roach at the back of the IMF mainsail. Big headsails and smaller
> mainsails with less roach both tend to move the Center of Effort (CE) of
the
> sail plan forward. Again, all else being equal, moving the CE forward
tends
> to cause lee helm. So, the newest Rhodes 22's seem to have 3 features
that
> should each cause lee helm.
>
> So my question for Stan & the list is: Do the newer boats with the diamond
> board, 175% genoas, & IMF mainsails have a lot of lee helm? If not, was
> some other change like moving the mast aft or the shoal draft keel forward
> also made at the same time as the diamond board was adopted?
>
> Roger Pihlaja
> S/V Dynamic Equilibrium
>
> ----- Original Message -----
> From: "Todd Tavares" <sprocket80 at mail.com>
> To: "The Rhodes 22 mail list" <rhodes22-list at rhodes22.org>
> Sent: Thursday, July 15, 2004 3:06 PM
> Subject: Re: [Rhodes22-list] Bob Skinner -keels- is there a difference?
>
>
> >
> > I monitor other lists as well as boat lists. One list for is
> > elevator people to exchange technical information, etc. Very often
we
> > get questions posted by engineering students that are given
> > assignments to build theoretical elevators in a building 5280 ft tall
> > and need to know beam loads and building codes. Or to explain relay
> > logic for elevator operation or breakdown of the microprocessor
> > algorythms for traffic management. Most of these questions are too
> > complex to explain in an e-mail. Some are impossible.
> >
> > What Rhodes 22 owner knows the information that Mr Brown is
asking
> > for? or even cares? We would like to know which board points
better
> > or goes faster.
> >
> > Maybe Mr. Brown is trying to manufacture Rhodes 22 knock-offs in
> > Great Britian and doesn't have a marine architect or engineer running
> > his CAD. I am sure that Stan did not just pull these dimensions and
> > specs out of his rear-end, but spent some time and money researching.
> > Lordy Lordy remember the stink I caused over getting a copy of an
> > owners manual posted? Mr Brown is asking for very precise
> > information, so I am confident that he is intelligent enough to have
> > figured out sooner how to unsubscribe himself....but as I only know
> > too well...for a would-be blogger, it is like the moth to the flame.
:
> > )
> >
> > The least we could do for him is to plug his name into a complaint
> > generator and wait for him to look up all of the "polysyllabic
> > neologisms" right Michael? :^{D lmao
> >
> > Todd
> >
> >
> > ----- Original Message -----
> > From: "ed kroposki"
> > Date: Thu, 15 Jul 2004 11:25:14 -0400
> > To: "'The Rhodes 22 mail list'"
> > Subject: [Rhodes22-list] Bob Skinner -keels- is there a difference?
> > >
> > > Bob,
> > > Several of us replied to him off list. His replies were .... as MJM
> > > mentioned. I doubt that any of us know the cord and centers that he
> > wanted,
> > > not that he would have understood them. We were just curious as to
> > why he
> > > wanted such technical information. If you have the information that
> > he
> > > wanted in the first place, send it to him and see what happens.
> > > Now that he brought up the subject, I would be interested in tank
> > > test results of the two systems. If you recall earlier this year we
> > has a
> > > discussion on the pointing ability of the R 22. Is there a
> > difference
> > > between the two keels?
> > > In magazines and other on-line discussions, there recently has been
> > > discussion of putting canting keels on very small boats. Do you
> > supposes
> > > that Stan will put one on a Rhodes 22? In time for the October Boat
> > Show?
> > >
> > > Ed K
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: rhodes22-list-bounces at rhodes22.org
> > > [mailto:rhodes22-list-bounces at rhodes22.org] On Behalf Of Robert
> > Skinner
> > > Sent: Thursday, July 15, 2004 10:44 AM
> > > To: Rhodes 22 mail list
> > > Subject: [Rhodes22-list] Browned off - Why not?
> > >
> > > Thought "Roger Brown" wanted out on the 12th.
> > > Now he's posting a nasty on the 14th.
> > > Why not just give him what he asked for in the
> > > first place?
> > >
> > > BTW - I can't find the 7/14 Brown message that MJM
> > > includes in his (on target) comments about manners.
> > > Was it killed before it got thru to the membership,
> > > or did I delete it somehow?
> > >
> > & gt; /Bob Skinner
> > >
> > > -------- Original Message --------
> > > Subject: [Rhodes22-list] Please Unsubscribe me!!!
> > > Date: Mon, 12 Jul 2004 03:14:17 +0100 (BST)
> > > From: roger brown
> > > Reply-To: The Rhodes 22 mail list
> > > To: Rhodes22-list at rhodes22.org
> > >
> > > Could you please unsubscribe me! I am tired of
> > > receiving the gossiping of everybody..
> > > Roger brown
> > >
> > > __________________________________________________
> > > Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
> > >
> > >
> > > __________________________________________________
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> > --
> >
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>
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