[Public-List] [EXTERNAL] Public-List Digest, Vol 4150, Issue 1

Gordon Laco mainstay at csolve.net
Tue Apr 13 15:12:24 PDT 2021


Hello Matt, 

Mains with attached foot rope is not antiquated… it’s preferred by most sailors.  Loose footed mains have been around for centuries.


Gordon Laco
426 Surprise
www.gordonlaco.com




> On Apr 13, 2021, at 5:46 PM, Greenhouse, Matthew A. (GSFC-6650) via Public-List <public-list at lists.alberg30.org> wrote:
> 
> Folks,
> 
> Regarding the main foot shelf:
> 
> I don't race my A30; so I'm not a stakeholder. That said, the Association might consider updating the class rules to permit loose-footed mains with more than one full length batten. I realize that the intent of such rules is, in part, to eliminate financial competition among the racers. However, forcing the class to be stuck with a sail design that is 55 years behind the state of art seems unfortunate. At some level, the rules should permit maximizing the performance of the boat.
> 
> Cheers,
> Matt Greenhouse
> Friendship 295
> 
> -----Original Message-----
> From: Public-List <public-list-bounces at lists.alberg30.org> On Behalf Of public-list-request at lists.alberg30.org
> Sent: Tuesday, April 13, 2021 2:11 PM
> To: public-list at lists.alberg30.org
> Subject: [EXTERNAL] Public-List Digest, Vol 4150, Issue 1
> 
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> ======================================================
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> 
> 
> Today's Topics:
> 
>   1. Spring Rendezvous and Maintenance Weekend Cancelled
>      (Jonathan Bresler)
>   2. Re: Mainsail Foot Shelf (americo silva)
>   3. Re: Mainsail Foot Shelf (Gordon Laco)
>   4. Re: Mainsail Foot Shelf (P Seidel)
>   5. Re: Mainsail Foot Shelf (Don Campbell)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Mon, 12 Apr 2021 19:54:39 -0400
> From: Jonathan Bresler <262alberg30 at gmail.com>
> To: Alberg 30 Public List -- open to all
> 	<public-list at lists.alberg30.org>
> Subject: [Public-List] Spring Rendezvous and Maintenance Weekend
> 	Cancelled
> Message-ID:
> 	<CAHEe8Tv4K284HZ1Qsxt7Q9qY9gNaxxHkqV+FDfHfiUzqmjb8qQ at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
> 
> Dear Albergers,
> 
> On April 12th, Monday evening your board met with our hosts of the Spring Rendezvous, Doris and John Maliszewski to review the current situation and its continuing impact on our social lives.  We had hoped that the situation would have improved sufficiently by April to allow us to proceed with the Spring Rendezvous and Maintenance Weekend.  I regret that to say that is not the case.  Therefore, both Spring Rendezvous and Maintenance Weekend
> 2021 are cancelled.
> 
> Cruising and racing will continue under the same protocols as used the last months of the 2020 season.
> 
> May it soon be the case that we can enjoy one another's company without undue risk.
> 
> All the best,
> Jonathan Bresler
> 2021 Commodore
> 
> 
> --
> Jonathan M Bresler
> S/V Constance Alberg 30 #262
> Annapolis/Eastport MD
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Tue, 13 Apr 2021 12:51:39 -0300
> From: americo silva <picomar1957 at gmail.com>
> To: Alberg 30 Public List -- open to all
> 	<public-list at lists.alberg30.org>
> Subject: Re: [Public-List] Mainsail Foot Shelf
> Message-ID:
> 	<CAMaMEABXHWKvizuBH-PTWA+NsyaKgPSRNJehp1DJF346nrgBqg at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
> 
> is there a rule that states how big a main sail can be
> 
> 
> On Sat, Apr 10, 2021 at 2:16 PM Mike Nikolich via Public-List <
> public-list at lists.alberg30.org> wrote:
> 
>> 
>> 
>> ?Jonathan,
>> 
>> I held off on writing this sooner as I thought others on this list had
>> previously expressed detailed views on a shelf foot and would speak up
>> again.  Maybe it wasn't here but on the Facebook page (and I'm rarely on
>> Facebook).
>> 
>> I would let your sailmaker determine the dimensions and shape of the
>> shelf.
>> 
>> There is nothing in the class rules that constrains it other than that the
>> sail must be attached to the boom for the full length of the foot and that
>> "no device such as zippers may be placed along the luff, the foot, and/or
>> the body of the sail for the purpose of adjusting the draft or the set of
>> the sail" (i.e. you can have a shelf foot but not one that you can zip
>> closed).
>> 
>> Without a shelf foot, the lower panels of an attached-foot mainsail are
>> cut flatter and flatter to provide a fair transition from the airfoil shape
>> of the sail to the straight line that is the foot along the boom.
>> For a loose-footed main the design airfoil shape is maintained all the way
>> down to the foot for better performance.  A sail with a shelf foot is
>> essentially a loose-footed main with a lightweight dacron "shelf" attached
>> to connect between the bottom main panel and the foot rope that still has
>> to be a straight line in the boom slot. The bottom line then is that the
>> size and shape of the shelf is driven by the shape your sailmaker has
>> designed into the bottom of the airfoil portion of the sail.
>> 
>> (There's a really bad joke somewhere in that last paragraph but I don't
>> know if I can find it....)
>> 
>> I know that my mainsail has a shelf foot but I don't know it's dimensions.
>> I can measure it but it will be sized based on the overall shape of the
>> bottom portion of my main. If considering a shelf for a new sail I would
>> let its dimensions be driven by your sailmaker's overall design.
>> 
>> Cheers!
>> Mike
>> 
>> Mike Nikolich
>> S/V Skybird
>> Alberg 30 #550
>> mike.nikolich550 at gmail.com
>> 
>> 
>> On Mar 16, 2021, at 9:40 PM, Jonathan Bresler via Public-List <
>> public-list at lists.alberg30.org> wrote:
>> 
>> Dear Albergers,
>> 
>> By class rules our mainsails must be connected to the mast and the boom.
>> Loose footed sails are disallowed.   One the methods for dealing with the
>> resulting shape
>> is to remove the bolt rope and  sew a half lens (half ellipse) to the foot
>> of the sail.
>> The curved side of the lens is sewn to the foot of the sail and the bolt
>> rope is moved
>> to the flat side of the lens.  This way when the outhaul is eased the
>> bottom portion of
>> the sail takes on a airfoil shape.  Then the outhaul is tight the bottom
>> portion of the
>> sail is much flatter and less powerful (better for heavy air).
>> 
>> How deep should the shelf be?  Wondering who has a foot shelf and what the
>> depth
>> of the shelf might be at 25%, 50%, and 75% aft along the foot.
>> 
>> Jonathan
>> 
>> --
>> Jonathan M Bresler
>> S/V Constance Alberg 30 #262
>> Annapolis/Eastport MD
>> 
>> 
>> _______________________________________________
>> These businesses support your Association:
>> https://gcc02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.alberg30.org%2Fstore%2FA30supporters.html&data=04%7C01%7Cmatt.greenhouse%40nasa.gov%7Cad6303f47c964f05911508d8fea77f5e%7C7005d45845be48ae8140d43da96dd17b%7C0%7C0%7C637539342641035109%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=Cgs7OoRF50cUGKnXp0FJI0Q7dVb1aCZ0V2ArVLYIkUs%3D&reserved=0
>> Please support them.
>> _______________________________________________
>> Public-List mailing list
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>> 
> 
> 
> ------------------------------
> 
> Message: 3
> Date: Tue, 13 Apr 2021 11:54:33 -0400
> From: Gordon Laco <mainstay at csolve.net>
> To: Alberg 30 Public List -- open to all
> 	<public-list at lists.alberg30.org>
> Subject: Re: [Public-List] Mainsail Foot Shelf
> Message-ID: <ACB61E80-1008-422C-9753-4EBD46C4E7E7 at csolve.net>
> Content-Type: text/plain;	charset=utf-8
> 
> Yes, the size and shapes of all the sails are closely defined, as well as construction.  Full battens and loose footed configurations are illegal in the class.
> 
> Gordon Laco
> 426 Surprise
> 
> 
> 
> 
> 
> 
>> On Apr 13, 2021, at 11:51 AM, americo silva via Public-List <public-list at lists.alberg30.org> wrote:
>> 
>> is there a rule that states how big a main sail can be
>> 
>> 
>> On Sat, Apr 10, 2021 at 2:16 PM Mike Nikolich via Public-List <
>> public-list at lists.alberg30.org> wrote:
>> 
>>> 
>>> 
>>> ?Jonathan,
>>> 
>>> I held off on writing this sooner as I thought others on this list had
>>> previously expressed detailed views on a shelf foot and would speak up
>>> again.  Maybe it wasn't here but on the Facebook page (and I'm rarely on
>>> Facebook).
>>> 
>>> I would let your sailmaker determine the dimensions and shape of the
>>> shelf.
>>> 
>>> There is nothing in the class rules that constrains it other than that the
>>> sail must be attached to the boom for the full length of the foot and that
>>> "no device such as zippers may be placed along the luff, the foot, and/or
>>> the body of the sail for the purpose of adjusting the draft or the set of
>>> the sail" (i.e. you can have a shelf foot but not one that you can zip
>>> closed).
>>> 
>>> Without a shelf foot, the lower panels of an attached-foot mainsail are
>>> cut flatter and flatter to provide a fair transition from the airfoil shape
>>> of the sail to the straight line that is the foot along the boom.
>>> For a loose-footed main the design airfoil shape is maintained all the way
>>> down to the foot for better performance.  A sail with a shelf foot is
>>> essentially a loose-footed main with a lightweight dacron "shelf" attached
>>> to connect between the bottom main panel and the foot rope that still has
>>> to be a straight line in the boom slot. The bottom line then is that the
>>> size and shape of the shelf is driven by the shape your sailmaker has
>>> designed into the bottom of the airfoil portion of the sail.
>>> 
>>> (There's a really bad joke somewhere in that last paragraph but I don't
>>> know if I can find it....)
>>> 
>>> I know that my mainsail has a shelf foot but I don't know it's dimensions.
>>> I can measure it but it will be sized based on the overall shape of the
>>> bottom portion of my main. If considering a shelf for a new sail I would
>>> let its dimensions be driven by your sailmaker's overall design.
>>> 
>>> Cheers!
>>> Mike
>>> 
>>> Mike Nikolich
>>> S/V Skybird
>>> Alberg 30 #550
>>> mike.nikolich550 at gmail.com
>>> 
>>> 
>>> On Mar 16, 2021, at 9:40 PM, Jonathan Bresler via Public-List <
>>> public-list at lists.alberg30.org> wrote:
>>> 
>>> Dear Albergers,
>>> 
>>> By class rules our mainsails must be connected to the mast and the boom.
>>> Loose footed sails are disallowed.   One the methods for dealing with the
>>> resulting shape
>>> is to remove the bolt rope and  sew a half lens (half ellipse) to the foot
>>> of the sail.
>>> The curved side of the lens is sewn to the foot of the sail and the bolt
>>> rope is moved
>>> to the flat side of the lens.  This way when the outhaul is eased the
>>> bottom portion of
>>> the sail takes on a airfoil shape.  Then the outhaul is tight the bottom
>>> portion of the
>>> sail is much flatter and less powerful (better for heavy air).
>>> 
>>> How deep should the shelf be?  Wondering who has a foot shelf and what the
>>> depth
>>> of the shelf might be at 25%, 50%, and 75% aft along the foot.
>>> 
>>> Jonathan
>>> 
>>> --
>>> Jonathan M Bresler
>>> S/V Constance Alberg 30 #262
>>> Annapolis/Eastport MD
>>> 
>>> 
>>> _______________________________________________
>>> These businesses support your Association:
>>> https://gcc02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.alberg30.org%2Fstore%2FA30supporters.html&data=04%7C01%7Cmatt.greenhouse%40nasa.gov%7Cad6303f47c964f05911508d8fea77f5e%7C7005d45845be48ae8140d43da96dd17b%7C0%7C0%7C637539342641035109%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=Cgs7OoRF50cUGKnXp0FJI0Q7dVb1aCZ0V2ArVLYIkUs%3D&reserved=0
>>> Please support them.
>>> _______________________________________________
>>> Public-List mailing list
>>> Public-List at lists.alberg30.org
>>> https://gcc02.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.alberg30.org%2Flistinfo.cgi%2Fpublic-list-alberg30.org&data=04%7C01%7Cmatt.greenhouse%40nasa.gov%7Cad6303f47c964f05911508d8fea77f5e%7C7005d45845be48ae8140d43da96dd17b%7C0%7C0%7C637539342641035109%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=9HoMYNJmlV%2B60WJf2oTNZPSDBvv95NCVLKSosB8r9Rg%3D&reserved=0
>>> 
>> _______________________________________________
>> These businesses support your Association:
>> https://gcc02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.alberg30.org%2Fstore%2FA30supporters.html&data=04%7C01%7Cmatt.greenhouse%40nasa.gov%7Cad6303f47c964f05911508d8fea77f5e%7C7005d45845be48ae8140d43da96dd17b%7C0%7C0%7C637539342641035109%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=Cgs7OoRF50cUGKnXp0FJI0Q7dVb1aCZ0V2ArVLYIkUs%3D&reserved=0
>> Please support them.
>> _______________________________________________
>> Public-List mailing list
>> Public-List at lists.alberg30.org
>> https://gcc02.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.alberg30.org%2Flistinfo.cgi%2Fpublic-list-alberg30.org&data=04%7C01%7Cmatt.greenhouse%40nasa.gov%7Cad6303f47c964f05911508d8fea77f5e%7C7005d45845be48ae8140d43da96dd17b%7C0%7C0%7C637539342641045075%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=g8RIbNoSycAOeBeezUQtVuaWY7F2Os6czvZS2fQOYOE%3D&reserved=0
> 
> 
> 
> ------------------------------
> 
> Message: 4
> Date: Tue, 13 Apr 2021 16:50:29 +0000 (UTC)
> From: P Seidel <pat.seidel at yahoo.com>
> To: Alberg 30 Public List -- open to all
> 	<public-list at lists.alberg30.org>
> Subject: Re: [Public-List] Mainsail Foot Shelf
> Message-ID: <653217848.902438.1618332629928 at mail.yahoo.com>
> Content-Type: text/plain; charset=UTF-8
> 
> Americo;The main measurements are:
> 
> Mainsail
> 
> Dacron cloth, between 5 oz and 7.25 oz per running yard 28.5" wide.
> 
> | Luff | 31 feet maximum | the P dimension |
> | Foot | 14 feet 3 inches maximum | the E dimension |
> | Leech | 33 feet 6 inches maximum |
> | Midgirth | 8 feet 6 inches maximum |
> 
> Also the foot has to be attached for the full length of the boom.
>    On Tuesday, April 13, 2021, 11:53:12 AM EDT, americo silva via Public-List <public-list at lists.alberg30.org> wrote:  
> 
> is there a rule that states how big a main sail can be
> 
> 
> On Sat, Apr 10, 2021 at 2:16 PM Mike Nikolich via Public-List <
> public-list at lists.alberg30.org> wrote:
> 
>> 
>> 
>> ?Jonathan,
>> 
>> I held off on writing this sooner as I thought others on this list had
>> previously expressed detailed views on a shelf foot and would speak up
>> again.? Maybe it wasn't here but on the Facebook page (and I'm rarely on
>> Facebook).
>> 
>> I would let your sailmaker determine the dimensions and shape of the
>> shelf.
>> 
>> There is nothing in the class rules that constrains it other than that the
>> sail must be attached to the boom for the full length of the foot and that
>> "no device such as zippers may be placed along the luff, the foot, and/or
>> the body of the sail for the purpose of adjusting the draft or the set of
>> the sail" (i.e. you can have a shelf foot but not one that you can zip
>> closed).
>> 
>> Without a shelf foot, the lower panels of an attached-foot mainsail are
>> cut flatter and flatter to provide a fair transition from the airfoil shape
>> of the sail to the straight line that is the foot along the boom.
>> For a loose-footed main the design airfoil shape is maintained all the way
>> down to the foot for better performance.? A sail with a shelf foot is
>> essentially a loose-footed main with a lightweight dacron "shelf" attached
>> to connect between the bottom main panel and the foot rope that still has
>> to be a straight line in the boom slot. The bottom line then is that the
>> size and shape of the shelf is driven by the shape your sailmaker has
>> designed into the bottom of the airfoil portion of the sail.
>> 
>> (There's a really bad joke somewhere in that last paragraph but I don't
>> know if I can find it....)
>> 
>> I know that my mainsail has a shelf foot but I don't know it's dimensions.
>> I can measure it but it will be sized based on the overall shape of the
>> bottom portion of my main. If considering a shelf for a new sail I would
>> let its dimensions be driven by your sailmaker's overall design.
>> 
>> Cheers!
>> Mike
>> 
>> Mike Nikolich
>> S/V Skybird
>> Alberg 30 #550
>> mike.nikolich550 at gmail.com
>> 
>> 
>> On Mar 16, 2021, at 9:40 PM, Jonathan Bresler via Public-List <
>> public-list at lists.alberg30.org> wrote:
>> 
>> Dear Albergers,
>> 
>> By class rules our mainsails must be connected to the mast and the boom.
>> Loose footed sails are disallowed.? One the methods for dealing with the
>> resulting shape
>> is to remove the bolt rope and? sew a half lens (half ellipse) to the foot
>> of the sail.
>> The curved side of the lens is sewn to the foot of the sail and the bolt
>> rope is moved
>> to the flat side of the lens.? This way when the outhaul is eased the
>> bottom portion of
>> the sail takes on a airfoil shape.? Then the outhaul is tight the bottom
>> portion of the
>> sail is much flatter and less powerful (better for heavy air).
>> 
>> How deep should the shelf be?? Wondering who has a foot shelf and what the
>> depth
>> of the shelf might be at 25%, 50%, and 75% aft along the foot.
>> 
>> Jonathan
>> 
>> --
>> Jonathan M Bresler
>> S/V Constance Alberg 30 #262
>> Annapolis/Eastport MD
>> 
>> 
>> _______________________________________________
>> These businesses support your Association:
>> https://gcc02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.alberg30.org%2Fstore%2FA30supporters.html&data=04%7C01%7Cmatt.greenhouse%40nasa.gov%7Cad6303f47c964f05911508d8fea77f5e%7C7005d45845be48ae8140d43da96dd17b%7C0%7C0%7C637539342641045075%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=l0XFLHygX%2B0uqUmyeCuBCy%2BRrctirxnGOEOMnyZ%2Fo4w%3D&reserved=0
>> Please support them.
>> _______________________________________________
>> Public-List mailing list
>> Public-List at lists.alberg30.org
>> https://gcc02.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.alberg30.org%2Flistinfo.cgi%2Fpublic-list-alberg30.org&data=04%7C01%7Cmatt.greenhouse%40nasa.gov%7Cad6303f47c964f05911508d8fea77f5e%7C7005d45845be48ae8140d43da96dd17b%7C0%7C0%7C637539342641045075%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=g8RIbNoSycAOeBeezUQtVuaWY7F2Os6czvZS2fQOYOE%3D&reserved=0
>> 
> _______________________________________________
> These businesses support your Association:
> https://gcc02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.alberg30.org%2Fstore%2FA30supporters.html&data=04%7C01%7Cmatt.greenhouse%40nasa.gov%7Cad6303f47c964f05911508d8fea77f5e%7C7005d45845be48ae8140d43da96dd17b%7C0%7C0%7C637539342641045075%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=l0XFLHygX%2B0uqUmyeCuBCy%2BRrctirxnGOEOMnyZ%2Fo4w%3D&reserved=0
> Please support them.
> _______________________________________________
> Public-List mailing list
> Public-List at lists.alberg30.org
> https://gcc02.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.alberg30.org%2Flistinfo.cgi%2Fpublic-list-alberg30.org&data=04%7C01%7Cmatt.greenhouse%40nasa.gov%7Cad6303f47c964f05911508d8fea77f5e%7C7005d45845be48ae8140d43da96dd17b%7C0%7C0%7C637539342641045075%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=g8RIbNoSycAOeBeezUQtVuaWY7F2Os6czvZS2fQOYOE%3D&reserved=0
> 
> 
> ------------------------------
> 
> Message: 5
> Date: Tue, 13 Apr 2021 18:10:44 +0000
> From: "Don Campbell" <dk.campbell at xplornet.ca>
> To: "Alberg 30 Public List -- open to all"
> 	<public-list at lists.alberg30.org>, "Alberg 30 Public List -- open to
> 	all" <public-list at lists.alberg30.org>
> Subject: Re: [Public-List] Mainsail Foot Shelf
> Message-ID: <em1cfdad76-2d6e-42a2-87a3-efadafbed55e at desktop-kadjbdn>
> Content-Type: text/plain; charset=utf-8; format=flowed
> 
> The first parts are OK, the second part is not and the third part is OK.
> Rule 12.2 of The Great LAkes Aloberg Association states:
> 12.2. Each mainsail shall have a maximum of four (4) battens of any 
> length.
> Rule 11B of the Chesapeake rules state:
> Each mailsail shall have 4 battens of any length.
> Don
> 
> ------ Original Message ------
> From: "Gordon Laco via Public-List" <public-list at lists.alberg30.org>
> To: "Alberg 30 Public List -- open to all" 
> <public-list at lists.alberg30.org>
> Cc: "Gordon Laco" <mainstay at csolve.net>
> Sent: 2021-04-13 11:54:33 AM
> Subject: Re: [Public-List] Mainsail Foot Shelf
> 
>> Yes, the size and shapes of all the sails are closely defined, as well as construction.  Full battens and loose footed configurations are illegal in the class.
>> 
>> Gordon Laco
>> 426 Surprise
>> 
>> 
>> 
>> 
>> 
>> 
>>> On Apr 13, 2021, at 11:51 AM, americo silva via Public-List <public-list at lists.alberg30.org> wrote:
>>> 
>>> is there a rule that states how big a main sail can be
>>> 
>>> 
>>> On Sat, Apr 10, 2021 at 2:16 PM Mike Nikolich via Public-List <
>>> public-list at lists.alberg30.org> wrote:
>>> 
>>>> 
>>>> 
>>>> ?Jonathan,
>>>> 
>>>> I held off on writing this sooner as I thought others on this list had
>>>> previously expressed detailed views on a shelf foot and would speak up
>>>> again.  Maybe it wasn't here but on the Facebook page (and I'm rarely on
>>>> Facebook).
>>>> 
>>>> I would let your sailmaker determine the dimensions and shape of the
>>>> shelf.
>>>> 
>>>> There is nothing in the class rules that constrains it other than that the
>>>> sail must be attached to the boom for the full length of the foot and that
>>>> "no device such as zippers may be placed along the luff, the foot, and/or
>>>> the body of the sail for the purpose of adjusting the draft or the set of
>>>> the sail" (i.e. you can have a shelf foot but not one that you can zip
>>>> closed).
>>>> 
>>>> Without a shelf foot, the lower panels of an attached-foot mainsail are
>>>> cut flatter and flatter to provide a fair transition from the airfoil shape
>>>> of the sail to the straight line that is the foot along the boom.
>>>> For a loose-footed main the design airfoil shape is maintained all the way
>>>> down to the foot for better performance.  A sail with a shelf foot is
>>>> essentially a loose-footed main with a lightweight dacron "shelf" attached
>>>> to connect between the bottom main panel and the foot rope that still has
>>>> to be a straight line in the boom slot. The bottom line then is that the
>>>> size and shape of the shelf is driven by the shape your sailmaker has
>>>> designed into the bottom of the airfoil portion of the sail.
>>>> 
>>>> (There's a really bad joke somewhere in that last paragraph but I don't
>>>> know if I can find it....)
>>>> 
>>>> I know that my mainsail has a shelf foot but I don't know it's dimensions.
>>>> I can measure it but it will be sized based on the overall shape of the
>>>> bottom portion of my main. If considering a shelf for a new sail I would
>>>> let its dimensions be driven by your sailmaker's overall design.
>>>> 
>>>> Cheers!
>>>> Mike
>>>> 
>>>> Mike Nikolich
>>>> S/V Skybird
>>>> Alberg 30 #550
>>>> mike.nikolich550 at gmail.com
>>>> 
>>>> 
>>>> On Mar 16, 2021, at 9:40 PM, Jonathan Bresler via Public-List <
>>>> public-list at lists.alberg30.org> wrote:
>>>> 
>>>> Dear Albergers,
>>>> 
>>>> By class rules our mainsails must be connected to the mast and the boom.
>>>> Loose footed sails are disallowed.   One the methods for dealing with the
>>>> resulting shape
>>>> is to remove the bolt rope and  sew a half lens (half ellipse) to the foot
>>>> of the sail.
>>>> The curved side of the lens is sewn to the foot of the sail and the bolt
>>>> rope is moved
>>>> to the flat side of the lens.  This way when the outhaul is eased the
>>>> bottom portion of
>>>> the sail takes on a airfoil shape.  Then the outhaul is tight the bottom
>>>> portion of the
>>>> sail is much flatter and less powerful (better for heavy air).
>>>> 
>>>> How deep should the shelf be?  Wondering who has a foot shelf and what the
>>>> depth
>>>> of the shelf might be at 25%, 50%, and 75% aft along the foot.
>>>> 
>>>> Jonathan
>>>> 
>>>> --
>>>> Jonathan M Bresler
>>>> S/V Constance Alberg 30 #262
>>>> Annapolis/Eastport MD
>>>> 
>>>> 
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>>>> 
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> 
> 
> ------------------------------
> 
> Subject: Digest Footer
> 
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> ------------------------------
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