[Rhodes22-list] Sail Plan Changes

[Hank]

How about "All of the above"?

On 10/31/07, Brad Haslett <flybrad at gmail.com> wrote:
>
> Hank,
>
> Basically the change would be from a P measurement of 34 to slightly over
> 33
> with the other parameters - I of 40, J of 13, and E of 12 remaining
> unchanged.  I'm hoping someone can put a slide rule to that and give me a
> ballpark effect in simple terms like (1) you won't notice the difference,
> or
> (2) you're a genius backyard engineer, or (3)  you're an idiot, what are
> you
> thinking?
>
> Brad
>
> On 10/31/07, Hank <hnw555 at gmail.com> wrote:
> >
> > Brad,
> >
> > Consider the sail as the force at the end of a lever.  The closer the
> > force
> > to the fulcrum the less the effect.  So, the higher up the sail, the
> more
> > the boat will heel over in a blow.  Lower sail, less heeling.  Also, the
> > rhodes sails faster upright than heeled over.  This is not true for most
> > sailboats.  Many boats increase waterline length, and theoretical hull
> > speed, when heeled over.  The rhodes hull shape really doesn't so heeled
> > is
> > not better.
> >
> > Hank
> >
> >
> > On 10/31/07, Brad Haslett <flybrad at gmail.com> wrote:
> > >
> > > Ok, boys and girls, put your thinking caps on!  Here's the deal, the
> > sails
> > > rep I've been visiting with has a 9.2C just like mine that he raised
> the
> > > boom 10 inches on for better headroom (mine is about 5' 11 1/8 inches
> > > above
> > > the cockpit which gives me 1/4 inch to play with versus getting
> whacked
> > > while standing up).  He also shortened his boom length 21 inches which
> I
> > > really don't want to do.  He says the boat handles better, has less
> > > weather
> > > helm, and the center of effort moves forward.  Other than the obvious
> > loss
> > > of sail area (less than 5% by my calculations) what can be anticipated
> > in
> > > changes of handling characteristics? He (the rep) says it moves the
> > center
> > > of effort forward and the boat is more stable based on his experience.
> > >
> > > Now this from Stan's site: *Lowering the boom, automatically lowers
> the
> > > sail
> > > inside the mast, which in turn lowers the center of effort of the
> sail,
> > > therefore increasing the stability of the boat without cutting sail
> > area.
> > > In fact, boat speed actually increases slightly by lowering the boom.
> > >
> > > *Can we assume then that raising the boom will decrease stability and
> if
> > > so
> > > by what margin?  What is your experience? Loss of speed is not an
> issue
> > > with
> > > me. Everytime I think about these things I get a headache.  I'm sure
> > Stan
> > > could answer this in about 2 seconds but I'm afraid he'd want a
> donation
> > > for
> > > his experience.  That greed thing again.  I'm hoping someone can think
> > > this
> > > through and give an informed opinion at a reasonable cost.  Like free!
> > >
> > > Brad
> > > *
> > >
> > > *
> > > __________________________________________________
> > > Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
> > >
> > __________________________________________________
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> >
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