[C38] A different mast question

[Mark O'Dell]

ok. Thanx for the info all. My riggers told me the following: (Dare i ask if anyone has an opinion on this? ha!)

Because the upper shrouds and intermediates share a toggling attachment to
the chainplate, it was necessary to measure all four shrouds.Both upper shroud wires are even at 47' 4-3/4". The starboard intermediate shroud wire
length is 34' 8-3/8". The port intermediate shroud wire length is 34' 9-1/8".

The maximum tension on the backstay adjuster, 9% of breaking strength, is
achieved when the adjuster is 34" exactly from pin center to pin center on its
attachment points.


Mark O'Dell
Momentous #230
Baltimore, MD
http://www.c38momentous.com




On Jun 25, 2013, at 1:12 PM, Ray Torok <torok13731 at gmail.com> 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> 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> 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
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