[Public-List] Mainsail

Jonathan Bresler 262alberg30 at gmail.com
Fri Jul 27 16:01:49 PDT 2018 

Well, I wrote a bit more than some folks might read.
The "short short" might be "buy a Velcro strap. Bend on the main using the
tack and clew rings only along the foot.  Run the Velcro strap through the
clew ring and around the boom a couple times.  Go sailing!   Does it
perform better for you or not?"   More ramblings below.

Jonathan

Attached foot:

   - the "ways sails have always been made".
   - Attaching the foot of the sail to the boom forces the lower/lowest
   portion of the main to transition from a natural airfoil shape higher up
   the sail to a straight shape along the boom.  All of the portion of the
   sail involved in making the transition has a less than desirable shape.
   This means lost power.
   - Possible that the bolt rope along the foot adds strength to the main.
   - Am fairly certain, if not certain, that the bolt rope minimizes any
   stretching of the fabric in the foot of the main.  If the fabric is
   stretching a bit higher up, not stretching to the point of damage or
   deformation, then the lack of stretch in the foot means that the transition
   must resolve a larger range of shape change. Presumably the sailmaker
   adjusts the way the sail is cut to ease the transition at the designed wind
   velocity.
   - The bolt rope may take up some of the forces exerted on the sail by
   the wind.
   - Conforms to the class rules as listed in the handbook of the Alberg 30
   Association of the Chesapeake Bay.


Loose foot:

   - Allows the entire main to take on a natural airfoil shape.
   - Concentrates the force of the wind on the clew and the tack.  Have
   heard that the clew is highly stressed to being with.  The lack of an
   attached foot can only increase the stresses.  Some number (many? all?) of
   loose foot mains are provided with a Velcro strap that goes through the
   clew ring and around the boom.  Expect that the Velcro reduces the stress
   on the webbing and stitching used to attach the clew slide to the clew
   ring.
   - Does not conform to the class rules as listed in the handbook of the
   Alberg 30 Association of the Chesapeake Bay.


Shelf foot:

   - Allows the main to take on the airfoil shape for which the shelf is
   cut.  Any other shape, draft forward or draft aft, would require a
   transition area from the shape cut into the shelf to the shape formed by
   the main.
   - Stresses may be distributed along the shelf....don't know.
   - As the outhaul is tensioned the shelf collapses allowing some
   variation in the airfoil shape of the lower/est portion of the main.
   - Conforms to the class rules as listed in the handbook of the Alberg 30
   Association of the Chesapeake Bay.


On Fri, Jul 27, 2018 at 2:22 PM, Marcelo Gentinetta via Public-List <
public-list at lists.alberg30.org> wrote:

> Hi Scotch,
> I just ordered a new mainsail from LeeSails. I ordered mine with a foot
> shelf and 1/2 inch slugs. I don't race either. I feel the foot shelf
> provides more support to the sail especially with high winds and you don't
> get any of the flogging along the foot that you sometimes see with the
> loose footed mains. Of course, everything is a compromise so you are giving
> up some adjustability and adding more hardware to the main. I don't like
> the bolt rope along the foot as I feel there is more chafing of the sail
> since it rests on the edge of the slot in the boom. Some folks like the
> loose footed mains when reefed since the reef points are tied around the
> sail rather than around the boom. The hardcore cruisers like the foot shelf
> better since it allows rainwater collection. Its all a matter of personal
> preference.
> Take care,
> Marcelo
> #441
> > On July 27, 2018 at 10:24 AM John Irving via Public-List wrote: > > >
> I’m having a new Mainsail made by Sailing Partners in Winooski Vt. My old
> main had a bolt rope that fit in a slide on the boom. The sailmaker wants
> to know if I want the new main to be loose footed with no bolt rope. What
> do you folks recommend? I’m a cruiser not a racer. > Scotch Bonner, #634 >
> > Sent from my iPhone > > > On Jul 26, 2018, at 8:04 AM, Andrew Johns
> wrote: > > > > John, > > I keep our boat up in Mallets Bay. Which Sail Loft
> did you use? > > Thanks, > > Andrew > > > >> On Wed, Jul 25, 2018 at 6:06
> PM John Irving via Public-List wrote: > >> I’m in Jericho Vt, and decided
> to have one made locally. > >> > >> Sent from my iPhone > >> > >> > On Jul
> 25, 2018, at 1:50 PM, jreadams6 via Public-List wrote: > >> > > >> > John
> where are you located and what shape does sail need to be in? > >> > > >> >
> Jonathan > >> > > >> > On Wed, Jul 25, 2018 at 7:54 AM Mike Lehman via
> Public-List < > >> > public-list at lists.alberg30.org> wrote: > >> > > >>
> >> George > >> >> > >> >> Both my Mainsail and Genoa were made by Bacon's -
> I am very pleased with > >> >> them, the quality is very good, even Towney
> was impressed. > >> >> > >> >> On Tue, Jul 24, 2018 at 5:54 PM George
> Dinwiddie via Public-List < > >> >> public-list at lists.alberg30.org>
> wrote: > >> >> > >> >>> They will tell you that finding a used low-aspect
> main that fits the A30 > >> >>> is pretty rare. The do sell custom made
> sails, though. Right, Mike > >> >> Lehman? > >> >>> > >> >>> George > >>
> >>> > >> >>> Sent from a primitive pocket computer. Please assume all
> errors are due > >> >> to > >> >>> that. > >> >>> > >> >>>> On Jul 24,
> 2018, at 17:12, Paul Wilson via Public-List < > >> >>>
> public-list at lists.alberg30.org> wrote: > >> >>>> > >> >>>> Bacon Sails in
> Annapolis has a search feature on their web site for > >> >> their > >>
> >>>> used sail inventory. Or just give them a call (or stop by if you're >
> >> >>> local.) > >> >>>> > >> >>>> Paul, Slainte #129 > >> >>>> > >> >>>>
> On Tue, Jul 24, 2018 at 4:57 PM, Jonathan Bresler via Public-List < > >>
> >>>> public-list at lists.alberg30.org> wrote: > >> >>>> > >> >>>>> John, >
> >> >>>>> > >> >>>>> Good to hear from you. Hope that all is well. > >>
> >>>>> I have one mainsail, the one that is on Constance #262. > >> >>>>> >
> >> >>>>> Jonathan > >> >>>>> > >> >>>>> On Tue, Jul 24, 2018 at 2:18 PM,
> John Irving via Public-List < > >> >>>>> public-list at lists.alberg30.org>
> wrote: > >> >>>>> > >> >>>>>> Does anyone have a used mainsail for sale? >
> >> >>>>>> John Irving > >> >>>>>> > >> >>>>>> Sent from my iPhone > >>
> >>>>>> > >> >>>>>>> On Mar 1, 2016, at 9:29 AM, John Irving via Public-List
> < > >> >>>>>> public-list at lists.alberg30.org> wrote: > >> >>>>>>> > >>
> >>>>>>> Please take lots of pictures, I'll be doing one soon. Are you doing
> > >> >> it > >> >>>>>> for better insulation? Was there any? > >> >>>>>>>
> John Irving > >> >>>>>>> Scotch Bonnet, #634 > >> >>>>>>> > >> >>>>>>> Sent
> from my iPhone > >> >>>>>>> > >> >>>>>>>> On Mar 1, 2016, at 7:40 AM, via
> Public-List < > >> >>>>>> public-list at lists.alberg30.org> wrote: > >>
> >>>>>>>> > >> >>>>>>>> > >> >>>>>>>> > >> >>>>>>>> Jonathan > >> >>>>>>>> >
> >> >>>>>>>> > >> >>>>>>>> Bring your stuff with you when you come over
> today, I'll put it > >> >> with > >> >>>>>> all of the A30 parts I've been
> collecting. > >> >>>>>>>> > >> >>>>>>>> > >> >>>>>>>> Mike Lehman > >>
> >>>>>>>> > >> >>>>>>>> ~~/)~/)~~ > >> >>>>>>>> > >> >>>>>>>> > >> >>>>>>>>
> > >> >>>>>>>> > >> >>>>>>>> > >> >>>>>>>> > >> >>>>>>>> On Mon, Feb 29,
> 2016 at 3:03 PM -0800, "Jonathan Adams via > >> >>>>> Public-List" > >>
> >>>>>> wrote: > >> >>>>>>>> > >> >>>>>>>> > >> >>>>>>>> > >> >>>>>>>> > >>
> >>>>>>>> > >> >>>>>>>> I started the icebox rebuild last weekend. - > >>
> >>>>>> > >> >> https://alberg30maintenance.wordpress.com/2016/02/28/ice-
> box-rebuild/ > >> >>>>>>>> Anyone want the door and the hardware? Let me
> know. I am in the > >> >>>>>> Annapolis area. > >> >>>>>>>> Jonathan > >>
> >>>>>>>> _______________________________________________ > >> >>>>>>>>
> These businesses support your Association: > >> >>>>>>>>
> http://www.alberg30.org/store/A30supporters.html > >> >>>>>>>> Please
> support them. > >> >>>>>>>> _______________________________________________
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> _______________________________________________ > >> >>>>>>>> These
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> _______________________________________________ > >> >>>>>>> These
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> listinfo.cgi/public-list-alberg30.org > >> >>>>>> > >> >>>>>>
> _______________________________________________ > >> >>>>>> These
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> >> >>>>> > >> >>>>> -- > >> >>>>> Jonathan M Bresler > >> >>>>> S/V
> Constance Alberg 30 #262 > >> >>>>> Annapolis/Eastport MD > >> >>>>>
> _______________________________________________ > >> >>>>> These
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> _______________________________________________ > >> >>>> These
> businesses support your Association: > >> >>>>
> http://www.alberg30.org/store/A30supporters.html > >> >>>> Please support
> them. > >> >>>> _______________________________________________ > >> >>>>
> Public-List mailing list > >> >>>> Public-List at lists.alberg30.org > >>
> >>>> http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org > >>
> >>>> > >> >>> > >> >>> _______________________________________________ >
> >> >>> These businesses support your Association: > >> >>>
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> them. > >> >>> _______________________________________________ > >> >>>
> Public-List mailing list > >> >>> Public-List at lists.alberg30.org > >> >>>
> http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org > >> >>>
> > >> >> > >> >> > >> >> -- > >> >> Mike Lehman > >> >> ~~~_/)_/)~~_/)~~~ >
> >> >> _______________________________________________ > >> >> These
> businesses support your Association: > >> >>
> http://www.alberg30.org/store/A30supporters.html > >> >> Please support
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> >> > > >> > > >> > -- > >> > Jonathan Adams > >> > 443-223-2534 > >> >
> _______________________________________________ > >> > These businesses
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-- 
Jonathan M Bresler
S/V Constance Alberg 30 #262
Annapolis/Eastport MD

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