[Public-list] rig tuning

[John Boor]

in the frozen north this is a yearly problem. On my boat I use a tension
meter and the scale shows a percentage of breaking strength, I set all of
mine to 10% of breaking. This is done at dockside and after cantreing the
rig as you state.  When this done done go out with full sail and check for
a slack cap shroud but not a loose shroud, if this is good you should be
O.K for awhile but check later because the wire will stretch over time.
The cross section of my mast is so great that I cannot induce any mast
bend at all and find I do not need any.

John Boor
MAHSEER #380

>
> I have couple of questions about setting up my rig. I just put it back up
> last night after being down for a long time. It is COMPLETELY out of
> adjustment. In particular, I have no idea what the rake setting should be.
>
>>
> 1. Get the rig straight in the boat by using the main halyard to make sure
> there are equal lengths from the masthead to both rails.
>
> 2. Sight up the mast to make sure it's in column. If not, use lowers to
> pull
> the middle one way or the other.
>
> 3. After doing 2, start over at 1 and repeat until the rig is both
> straight
> in the boat AND in column.
>
> 4. Check the rake using main halyard to corner of transom. I do not know
> what this dimension should be and I would really appreciate some guidance
> from those of you who are experienced. Adjust rake as necessary to get the
> mast in the right place fore and aft, rake-wise. I am expecting that the
> rake should be pretty close to straight up and down, or maybe even kicked
> forward a little bit.
>
> 5. Once rake is set, adjust the lowers fore and aft to get neutral bend,
> or
> perhaps just a little bit of forward bend. Measure bend using main halyard
> stretched very tight to the gooseneck. Distance from main halyard to mast
> track at spreaders is the bend measurement. I am thinking not more than 2"
> at the very most.
>
> 6. Once all of the settings are more or less correct geometrically
> speaking,
> adjust tension to be in the ballpark. If somebody could give me tension
> numbers that would be very helpful. There is a listing at:
>
> http://www.alberg30.org/maintenance/SparsSailsRigging/tensions.html
>
> But there is a tremendous amount of variability in those numbers. I have
> had
> one suggestion to use the #'s from US 17 which are 890# on the backstay,
> 890# on the uppers and 640# on the forward lowers.
>
> 7. All done? Rinse and repeat as necessary to make sure everything is
> still
> straight in the boat, in column, rake is correct, and properly bent with
> the
> desired tension.
>
> Thoughts? I have done this on lots of other kinds of boats, but never on
> my
> Alberg.
>
> Kind regards,
>
> J Bergquist
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