Author Topic: P323 Standing rigging tuning  (Read 1444 times)

selene

  • P323
  • Hero Member
  • *
  • Posts: 315
  • Karma: 5
  • Mighty Member
    • View Profile
  • Model: P323
  • Vessel Name: Selene
  • City: Redwood City
  • State: CA
P323 Standing rigging tuning
« on: July 24, 2019, 10:27:45 PM »
In the next few weeks I am going to pull and replace all the chainplates - Garhauer will make new ones for a decent price. Hey, it's been 40 years! :-) In preparation I checked the tension on the standing rigging - seems a bit loose to me (in fact, leeward shrouds are loose - very loose (floppy) - when heeling).

Do you guys have recommendations for shroud/stay tension?

Selene is currently:
Backstay                 600lbs  (insulated)
Aft lower shroud      700lb
Upper (cap) shroud  530lb
Fwd lower               700lb
Forestay                 ?? (roller furler)

All of these are around 5% of breaking strength for the wire...well below the 10-15% often recommended.

Thoughts?

selene

  • P323
  • Hero Member
  • *
  • Posts: 315
  • Karma: 5
  • Mighty Member
    • View Profile
  • Model: P323
  • Vessel Name: Selene
  • City: Redwood City
  • State: CA
Re: P323 Standing rigging tuning
« Reply #1 on: August 15, 2019, 09:39:38 AM »
UPDATE:

Well, not a lot of feedback on my post :-). Based on research - and almost nothing from Pearson! - typical guidelines are to tension to 10%-15% breaking strength of the wire (racing boats up to 20%). Without going into a lot of detail, I took care the mast was straight, and introduced a small rake (yes, our big thick masts do bend!), and tightened the rig...

(as an aside: Our lower shrouds are 1x19 316 s/s.  1/4" BS for 316 is 7,600lb; cap shrouds and stays are 9/32", with a BS of 7,800lb)

New tensions:
  Aft lower: ~580lbs
  Cap shrouds/upper: 750lb
  Fwd lower: 800lb
  Backstay: 980lb

With the rig tuned like this, I was able to point ~5% higher. And my leeward shrouds no longer flop around in moderate (15-20kn) winds!

Ideally I would have put a little more on the fore/back stays - there is still some headstay sag - but noticed that as I added a couple more turns on the turnbuckle, the tension did not increase. However, after measuring the fwd-aft length of the boat, the hull was beginning to bend. So I guess the was not designed for a really tight rig, and I think around 900lb may be optimal.

Well, that's all for a bit. I just pulled the chainplates (which were actually in good shape! Oh, well) so more experimentation will have to wait for a while. But this has convinced me that (within moderate limits) tuning the 323 rig can improve performance. Yes, possibly "duh", but...

Rusty Pelican

  • P323
  • Sr. Member
  • *
  • Posts: 208
  • Karma: 4
  • http://rustypelican.blogspot.com/
    • View Profile
  • Model: P323
  • Vessel Name: Rusty Pelican
  • City: Hingham
  • State: MA
Re: P323 Standing rigging tuning
« Reply #2 on: August 16, 2019, 09:14:57 AM »
A P232 owner at my club cranked down his backstay such, he could not open his starboard cockpit locker. Kind scared me. Ater we let off the pressure, all was fine.
The stern must have deformed a bit.
I use the Loos tool to tune the mast, works fine. I think I am around 10% or so.
The P323, after 37 continuous seasons cruising the NE coast has taught, me many things.
#1 give her what she wants.
Yes the P323 can be bent and it is good, not designed for a rake.