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Judy and web gang,
I think this goes back to the difference between the way the P-15 and P-19
are rigged. I am pretty sure mine is factory but do not know for sure.
Anyway, my main halyard is 1/4" yachtbraid on a bight around a wichard
shackle, secured by whipping. The block at the top of the mast is a
standard harken cheek block attached near the top of the mast by two pop
rivets. The topping lift is opposite the main halyard. The spinnaker and
jib halyards pass through simple blocks attached by eyestraps riveted to the
mast. The turning blocks for the main and jib are cheek blocks pop riveted
near the foot of the mast. The stays are attached by eyestraps and pop
rivets to the mast. Is anyone else's P-15 rigged different. Any
suggestions for improvement would be greatly appreciated.
Richard
> ----------
> From: JBlumhorst@aol.com
> Sent: Tuesday, March 9, 1999 4:16 PM
> To: Richard.Dickerson@ttmc.ttuhsc.edu
> Cc: wwpotter@tscnet.com
> Subject: Re: Cam, Clam, Jam, and clutch.
>
> - - - - - - - - - - - - - - - - - - - - - - - - - - -
> West Wight Potter Website at URL
> http://www.lesbois.com/wwpotter/
> - - - - - - - - - - - - - - - - - - - - - - - - - - -
> In a message dated 3/9/99 1:54:49 PM Pacific Standard Time,
> Richard.Dickerson@TTMC.TTUHSC.EDU writes:
>
> > Judy, I am probably showing my ignorance here but wouldn't you want the
> > cleat to be the weakest part of the system? It seems to me that the
> working
> > strength of the halyard, splice, and shackle is less than 500 lb.. IT
> would
> > seem that the last thing you would want to happen on a cruise is loose
> the
> > sail to halyard connection with no way to reconnect it without
> unstepping
> > your mast. Worse still would be pulling the attachment of the block
> out of
> > the mast. Mine is held by two 3/16" pop rivets. By the way, all my
> > halyards on the P-15 are 1/4" and pass through harken cam cleats.
> > Regards
> > > ----------
> > > From: JBlumhorst@aol.com
> > > Sent: Tuesday, March 9, 1999 2:46 PM
> > > To: Richard.Dickerson@ttmc.ttuhsc.edu
> > > Subject: Re: Cam, Clam, Jam, and clutch.
> > >
> > > In a message dated 3/9/99 12:27:41 PM Pacific Standard Time,
> > > Richard.Dickerson@TTMC.TTUHSC.EDU writes:
> > >
> > > > Dear Judy, How did you figure the load on your main sheet halyard?
> Let
> > > me
> > > > know please. Everything else looks good. Richard Dickerson
> > >
> > > Dear Dik,
> > >
> > > I consulted Bruce, the head rigger at Svendson's in Alameda.
> Incredible
> > > guy.
> > > He rigs million dollar yachts and still takes me and my questions on
> my
> > > P19
> > > seriously. He looked up the sail area, hull
> length/weight/displacement
> > > type,
> > > average wind conditions on SF Bay on a chart and recommended a
> minimum of
> > > 500
> > > SWL. He specifically cautioned me not to use a cam cleat or the
> spinlock
> > > miniclutch (200# SWL) for the main halyard if I was going to sail in
> heavy
> > > air.
> > >
> > > For my blocks everywhere on the boat, he estimated the load based on
> his
> > > experience. Then I did the layout, applied a load factor depending
> on
> the
> > > lead angle, and made my final selection for each block.
> > >
> > > Regards,
> > > Judy
> > >
> >
> >
> Hi Dik,
>
> I'm not sure I understand the question. Perhaps you could rephrase it.
>
> Everything on my P19 main halyard rig is rated for 500 # SWL or better.
> According to the rigger, 500 pounds should be plenty of safety margin for
> the
> P19, (taking into account the turning angles, which can greatly change the
> load factors)
>
> I don't have any pop rivets holding any blocks anywhere on my mast and I'm
> not
> sure where the pop rivets you mention are on your rig.
>
> My main halyard is Vizzion (vectran) which is super strong (much stronger
> than
> 500#), very-low-stretch, and doesn't absorb water. At the head of my
> mast,
> the halyard passes through two strong sheaves. At the bottom, it passes
> though a turning block rated for 500# (Harken #183 block), with a turning
> angle less than 90 degrees. The Harken #183 is attached with an
> appropriately
> selected shackle to the mast-step plate which is just plain huge for a
> boat
> the size of the P19. From there it goes to a horn cleat (at least until I
> finish the rest of the installation, with the right deck organizers and
> clutches)
>
> Best,
> Judy
>
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