[Rhodes22-list] Sail Plan Changes

[Leland]

Brad,

Impressive boat!  
http://www.sailingbreezes.com/Sailing_Breezes_Current/Articles/July99/S2review.htm
http://www.sailingbreezes.com/Sailing_Breezes_Current/Articles/July99/S2review.htm 
Compared to a Rhode22, your 9.2C is going to be extremely stable.  Based on
the attached article and ballast (9,800 lb. boat with 4,000 lbs. of
ballast), she might be a little more tender than other cruisers her size. 
If that's the case, Hank's lever analogy will have more of an effect. 
Considering that you are decreasing sail size, it may not have much of an
effect at all, and you aren't increasing sail area at the top of your mast;
as opposed to our Rhodes when we raise the boom.

Like everything else on a boat it's a comprimise.  The biggest danger on a
sailboat is drowning.  The second biggest danger is getting hit in the head
with the boom (often followed by drowning).  Raising the boom seems like a
reasonable comprimise.

Lee
1986 Rhodes22  At Ease
Crab Alley (Kent Island, MD)





Hank-5 wrote:
> 
> 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
>> > >
>> > __________________________________________________
>> > Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
>> >
>> __________________________________________________
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>>
> __________________________________________________
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> 
> 

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