[Rhodes22-list] keels- is there a difference?

[FredkLange at aol.com]

Roger,

I have a '93 with a diamond board and the rigging you describe.  From a full 
beam reach to a tight upwind beat, the helm is absolutely neutral with main 
properly tuned.

Fred

In a message dated 7/15/04 10:33:48 PM Eastern Daylight Time, 
cen09402 at centurytel.net writes:

> 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
> 
>