flared hull Re: [Rhodes22-list] burying the rail

[Mary Lou Troy]

Bill,
These are the notes from my conversation with Stan about the origin of the 
flared hull. Most of this was incorporated into the chapter in the Sailing 
Small book.

My notes: "Stan was an admirer of the curves in the 505 dinghy. He had used 
a flared hull in a previous boat the Picnic 17. If you look at the pictures 
of the Picnic 17, the shape of the stern, the curves of the hull by the rub 
rail and the curves of the gunnels look very familiar. (see 
http://www.rhodes22.org/rhodes/pics/picnic_17.jpg ) When he decided he 
wanted to design and build a small cruiser he took the idea to Phil Rhodes. 
Rhodes was initially resistant but came to like the idea of using the 
flared hull in a small cruiser. Stan liked the flared hull because it 
created increased stability when heeled, added strength from the compound 
curves in the fiberglass, yielded a drier boat and the broad gunnels 
allowed crew to hike out comfortably without leaving the boat."

My interpretation of all this is that Stan already knew the curves and 
flare he wanted (he'd used them in the Picnic) and relied on Phil Rhodes to 
come up with the underwater shape to mesh to those curves. Rhodes probably 
also refined the curves. Rhodes liked narrow boats. The R22 has somewhere 
between 6 and 7 feet of beam at the water line - fairly narrow for a 22 
footer. The flare gives it the illusion of more beam and  gives it more 
room for those cruising amenities not to mention those wonderful sidedecks 
with a clear path forward. If you take a look at the 505s (see 
http://www.int505.org/ ) you'll see some similarity in the flare and the 
curves of the gunnels but the shape of the hull is very different and they 
are obviously a racing machine meant to be sailed very athletically (for 
example see the picture at 
http://www.int505.org/usa/events/2006Midwinters/DSCF0329.JPG ).

Mary Lou
1991 R22 Fretless
Ft. Washington, PA / Rock Hall, MD (Swan Creek)

At 09:39 PM 4/18/2006 -0400, you wrote:
>Peter,
>
>As always, keep this stuff coming.  It's like copying homework from the 
>smartest kid in the class.
>As I understand it, Stan based the hull shape of the R-22 on the 505 
>racing dinghy.  Do you know any more about that?
>
>Bill Effros
>
>Peter Thorn wrote:
>>GlacierEd,
>>
>>I thought Rummy started this conversation by asserting the speed of a Rum
>>Runner fly-bye.
>>
>>To address your question, I agree with Buddy Melges that all boats have an
>>optimum angle of heel.  For most small sailboats (and I think for R22 too)
>>it's about 15 degrees.  That ideal angle sets a boat "on it's lines" and is
>>probably how Phil Rhodes intended the boat be sailed.  A small amount of LWL
>>increase would be likely at that angle, maybe an inch or so.
>>
>>Buddy Melges on Sailing to Windward:
>>
>>"The first thing you must determine is your boat's optimum angle of heel.
>>This angle varies quite widely from class to class or from one design to
>>another, but it always applies, no matter how strong or weak the wind, and
>>you should memorize what that angle is.  A Flying Dutchman, like most
>>dinghy-type boats, likes to sail to windward almost straight up with no heel
>>at all.  Keelboats, on the other hand, might sail their best when they are
>>heeled over 20 degrees or more.
>>
>>When I get onboard a boat I haven't sailed before, I sail off by myself and
>>find out what the correct angle is.  The boat will give you the information
>>you need:  straighten the boat up and it slows down; heel it over too far
>>and it slows down - in short, whenever it gets off its ideal sailing lines
>>it slows down.  Once you have identified the optimum angle of heel, that
>>becomes the groove angle of the boat; you always should sail to windward at
>>that angle.  All your tiller, traveler, and sail-shape adjustments should be
>>made to keep the boat sailing at that one angle."
>>
>>PT
>>
>>
>>
>>
>>
>>------------------------------------------------------------------------
>>
>>__________________________________________________
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>__________________________________________________
>Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list