[C38] head stay tension
Don Strong
drstrong at ucdavis.edu
Tue Jun 25 14:24:21 EDT 2013
Ray: Dunno about pinning at the partners. The PO had new rigging done by
a big shot.
Maybe some one else can figure this out
On 6/25/13 11:02 AM, Ray Torok wrote:
> Don:
>
> Interesting. Do you know if your mast was free at the partners when
> the rig was tuned?
>
> I'm worried that my mast is pinned at the partners with too little
> mast rake and too little headstay tension, so the only way I can get
> adequate headstay tension is by cranking on the backstay. With the
> backstay at 1000 on the gage (I'm not sure what that means really), I
> have quite a bit of mast bend, and not that much headstay tension.
> This discussion is making me think I need to either shorten the
> headstay a bit or let the mast come back more (increase rake) at the
> partners and adjust the lower shrouds accordingly. The alternative is
> to let the forward lowers pull the middle of the mast forward while
> the backstay pulls the top back to establish both headstay tension and
> mast bend. I have to believe someone has solved this problem.
>
> Thanks,
> Ray
>
>
> On Tue, Jun 25, 2013 at 10:44 AM, Don Strong <drstrong at ucdavis.edu
> <mailto:drstrong at ucdavis.edu>> wrote:
>
> Mark:
> The winds are such that we go to weather when embarking on a
> sail from the east SFB. Before leaving the dock, I tighten the jib
> furler by means of the jib sheet led to port winch on the mast. If
> you don't have a furler, then you would perform this tightening
> when you raise the jib. Then I then put 1000lbs of tension on the
> back stay adjuster. This places more tension on the jib furler,
> which one can see easily in reduced sag and sway of the furled
> jib; 1000 lbs of tension gives a taught, furled head sail even in
> a seaway. The backstay tension greatly improves the performance
> going to weather. I echo the advice of your rigger. Too much
> backstay tension will bend the boat. It causes the head door to
> jam shut on Discreet Charm. 1000 pounds on the gauge of our
> backstay adjuster does not change the shape of the gap between the
> head door and the frame.
> When we head home, I release the backstay tension. This improves
> performance before the wind. I release tension on the jib furler
> before disembarking.
>
> Others on the list are much more accomplished sailors than me, and
> will give more sophisticated advice.
> Regards, Don
>
> On 6/25/13 10:12 AM, Ray Torok wrote:
>> Adding to the discussion - If the forward lower shrouds are tight
>> and/or the mast is pinned at the partners, the backstay will
>> impart all kinds of mast bend, so I don't understand your
>> rigger's statement.
>>
>> Ray Torok
>> Thira #37
>> San Francisco
>>
>>
>> On Tue, Jun 25, 2013 at 10:06 AM, Mark O'Dell
>> <mixedbusinesscontact at gmail.com
>> <mailto:mixedbusinesscontact at gmail.com>> wrote:
>>
>> Sorry that this might be a bit of a tangent, but Ray's
>> question below sparked another semi-related question that I have:
>>
>> Last year I had my spreaders re-angled, my rig inspected and
>> tuned. (Ended up replacing the shroud extension cable that
>> comes through the hanging locker, as it was microscopically
>> cracked in a few places on the swauge).
>>
>> Anyway, these people told me something interesting, in that
>> they said said we don't have a mast that will have much bend
>> to it.. so be very gentle with the backstay adjuster. (They
>> went so far as to making me a limit indicator on the adjuster
>> that "I shouldn't" exceed. )
>>
>> They're telling me that our masthead rig isn't really bending
>> the mast much at all... it's just pulling the mast down on
>> the keel step harder and harder.
>>
>> I will also say that even if I exceed their "limit" my head
>> stay is still sagging more than I think it should. +6"
>>
>> Do you guys go above 2k lbs of pressure? 3k? What you're setting?
>>
>> Is my mast rake out of whack?
>>
>> Mark O'Dell
>> Momentous #230
>> Baltimore, MD
>> http://www.c38momentous.com
>>
>>
>>
>>
>> On Jun 25, 2013, at 12:52 PM, Ray Torok <torok13731 at gmail.com
>> <mailto:torok13731 at gmail.com>> wrote:
>>
>> > All:
>> >
>> > After repairing my lower spreaders, I have to retune the
>> whole rig. Are there recommended settings for mast rake,
>> pre-bend and that stuff? Also, is there a recommended tuning
>> procedure (several are out there on the internet)? Should I
>> remove the Spartite plug at the partners to start? I have no
>> idea if the original setup was okay. In fact, without lots
>> of backstay (and mast bend), the headstay seemed awfully
>> slack to me. Any thoughts/advice/experience would be
>> appreciated.
>> >
>> > Thanks,
>> >
>> > Ray
>> > _______________________________________________
>> > Listserve mailing list
>> > Listserve at catalina38.org <mailto:Listserve at catalina38.org>
>> > http://catalina38.org/mailman/listinfo/listserve_catalina38.org
>>
>>
>> _______________________________________________
>> Listserve mailing list
>> Listserve at catalina38.org <mailto:Listserve at catalina38.org>
>> http://catalina38.org/mailman/listinfo/listserve_catalina38.org
>>
>>
>>
>>
>> _______________________________________________
>> Listserve mailing list
>> Listserve at catalina38.org <mailto:Listserve at catalina38.org>
>> http://catalina38.org/mailman/listinfo/listserve_catalina38.org
>
>
> --
> Donald R. Strong
> Professor,
> Department of Evolution and Ecology
> and
> The Bodega Marine Laboratory,
> University of California, Davis,
> Davis CA
> 95616
> 530 752 7886 <tel:530%20752%207886>
>
>
> _______________________________________________
> Listserve mailing list
> Listserve at catalina38.org <mailto:Listserve at catalina38.org>
> http://catalina38.org/mailman/listinfo/listserve_catalina38.org
>
>
>
>
> _______________________________________________
> Listserve mailing list
> Listserve at catalina38.org
> http://catalina38.org/mailman/listinfo/listserve_catalina38.org
--
Donald R. Strong
Professor,
Department of Evolution and Ecology
and
The Bodega Marine Laboratory,
University of California, Davis,
Davis CA
95616
530 752 7886
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://catalina38.org/pipermail/listserve_catalina38.org/attachments/20130625/58842146/attachment-0001.htm>
More information about the Listserve
mailing list