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Author Topic: PBO Rigging  (Read 16728 times)

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Offline PaulJ

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Re: PBO Rigging
« Reply #15 on: May 29, 2012, 10:29:55 PM »
The material costs have come to about £160, but I have enough of everything to make 2 complete sets at least, forestay, 2 shrouds and lowers, not going to make uppers as they are already dynema sk90
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Offline PaulJ

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Re: PBO Rigging
« Reply #16 on: June 07, 2012, 12:50:16 PM »
Update - PBO forestay finally finished on Saturday morning prior to leaving for Weston, again tested with the tree and Landrover in low range, managed to deform a good sized shackle, it was sail tested on Tuesday in 20 knots of breeze and performed without a hitch, unfortunately the professionally made dyform shrouds failed, but that's another story

PBO forestay facts

Approx 5m long
Finished OD - approx 4mm

Component weight - approx
2 No. Stainless thimbles - 7g
PBO - 50g (44 yarns)
Heat shrink tape - 10g
Black polyester braid cover -15g
Heat shrink tubing - 5g
Flexible epoxy - 1g

Total weight - 90g

Current Dyform 3mm forestay - 400g

Total manufacture time 3 hours, the most time consuming part was winding the heat shrink tape. The orginal plan was to use adhesive heat shrink tubing but this weighed 13g/m so was rejected. The braided cover is a bit big and will be too high windage for shrouds, (fine for a forestay though as it inside the jib luff), so a smaller diameter needs to be sourced. Expected total rigging weight including forestay, shrouds and lowers, including shackles etc - 550g.



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Offline john_hamilton

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Re: PBO Rigging
« Reply #17 on: June 07, 2012, 05:32:27 PM »
very interesting, what price estimate have you come up for the whole rigging?
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roland_trim

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Re: PBO Rigging
« Reply #18 on: June 07, 2012, 11:01:36 PM »
If you scales are good I would be very interested in weight made, after first dunk and then a few months later.
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Offline BenR

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Re: PBO Rigging
« Reply #19 on: June 08, 2012, 10:54:03 AM »
"On modern racing yachts Zylon is used for parts of the standing rigging. It is used as shrouds and stays, except the forestay due to torsion weakening the fiber"

Interesting what our friend wikipedia has to say about PBO

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Offline john_hamilton

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Re: PBO Rigging
« Reply #20 on: June 08, 2012, 12:04:56 PM »
could that be due to roller furlers? forgive me, i know knothing about yachts
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Offline BenR

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Re: PBO Rigging
« Reply #21 on: June 08, 2012, 12:13:11 PM »
Good point, I was wondering where the torsion came from.
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Offline Neil C.

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Re: PBO Rigging
« Reply #22 on: June 08, 2012, 06:34:31 PM »
This recent thread from the antipodean second-cousins might be of interest:

http://z10.invisionfree.com/12ft_skiffs/index.php?showtopic=508
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