[Alberg30] tunning, shroud tension

[Brian and Elaine Timmins]

The only reason I can imagine to have the after lowers loose would be that
when the mast does flex, it will go forward in the mid section, which will
have the effect of flattening the main sail some. More wind, more flex,
flatter sail.
Maybe some more experienced Albergers have a different reason?
Brian   #497
----- Original Message -----
From: "Dave Terrell" <DTERRELL.GWSTAFF.GWNMC at message.nmc.edu>
To: <public-list at alberg30.org>
Sent: Friday, January 11, 2002 1:41 PM
Subject: Re: [Alberg30] tunning, shroud tension


> Thanks for the info. When I looked at my Loos I came to the same
conclusion. If a person went for the 10% figure the 1/4 inch stays/shourds
would be set at about 850 pounds, the 3/6 shourds at about 500 pounds, and
the forestay/backstay as you indicate.
>
> What I do not understand is why there seems to be a tendency(based on the
figures provided)  to under tension the Alberg 30 rig (by Loos standards).
What really puzzles me is the tendency to have little to no tension on the
aft lower shroud.
>
> Right now I would have to assume that tensioning practice is based upon
experience, but I really would like to know why it works if that really is
the case. Any insight on this would be appreciated.
>
> >>> timmins at optonline.net 01/09/02 11:38PM >>>
> Sorry about taking so long to respond. It took a while to locate the info.
> From my Loos Instructions, 1/4" wire breaking strength is 8200 lbs and
3/16" is 4700 lbs. Additionally, Loos recommends 1/4" forestay set to 1300
lbs, 1/4" shrouds set to 850 lbs, and 3/16 shrouds set to 500 lbs.
> The relationship of forestay / backstay is something I can't comment on
directly since I've got roller furling on the forestay and therefore can't
easily measure the tension there. Loos makes the statement, "Since the
backstay makes a greater angle to the mast, the backstay tension will be
lower than the forestay tension."
>   ----- Original Message -----
>   From: Dave Terrell
>   To: public-list at alberg30.org
>   Sent: Thursday, January 03, 2002 2:51 PM
>   Subject: Re: [Alberg30] tunning, shroud tension
>
>
>   How do these numbers fit with the general guidelne that shrouds should
be tensioned between 10 and 12% of the breaking strength the wire? This is
what the instructions for my Loos tension guide said and that has been my
guideline in the past. That worked on my old boat, a CAL 27 T-2. If the
application of the rule to my "new" Alberg 30 is different, I would like to
know. I appreciate having this source of informatioin avaliable.
>
>   >>> timmins at optonline.net 12/28/01 06:37PM >>>
>   These are the conclusions I drew from the list when it was published in
May
>
>   Average tensions of the whole list:
>   Forestay/Backstay............733
>          Backstay only...................726
>          Forestay only....................735.6
>   Uppers.............................685
>   Fwd Lowers.....................495
>   Aft Lowers........................0   (loose)
>
>   Race Boats Only Averages:
>   Forestay only....................811
>   No backstay only
>   Uppers..............................862
>   Fwd Lowers......................679
>
>   Based on these numbers and info taken from Brion Toss's video on rig
tuning
>   (and his web site), This is how I set up my mast.
>   Starting with the mast vertical, tighten the forestay to snug/tight  but
not
>   to pull the mast forward of vertical.
>   Tighten the backstay to 625
>   Tighten uppers to 750
>   Tighten Fwd lowers to 620
>   Tighten Aft lowers to slack/100
>
>   After sailing a bit, I reset the backstay to 700
>   These numbers worked very well for me and the boat was nicely balanced.
>
>   Don't ask me to explain my logic anymore (this was done in June). I just
>   happened to come across my note sheet from doing the job.
>   All tensions were done with a Loos Model B, part # 90 gauge
>
>   Regards,
>   Brian
>   #497
>   ----- Original Message -----
>   From: "George Dinwiddie" <gdinwiddie at min.net>
>   To: <public-list at alberg30.org>
>   Sent: Thursday, December 27, 2001 11:41 AM
>   Subject: Re: [Alberg30] tunning, shroud tension
>   snip
>   > If anyone can draw some general conclusions from this list,
>   > I think we'd all like to hear it.
>   >
>   snip
>
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