Won't the same diameter have the same wind resistance???
From: Michael Sporer <pasta514 at hotmail.com>
To: tuna at myfleet.org
Sent: Monday, March 21, 2016 9:19 AM
Subject: Re: [Santana 22] Replacement Tuna rigging - Dyform or compacted wire, anyone?
I was under the impression that for a given nominal wire size the compacted version had the same cross-section area of steel, same strength, same weight and same stiffness, but had lower wind resistance. That way in a pinch you can swap between the two types without worrying about any differences in the really important parameters.
On 3/20/2016 11:02 PM, Jan Grygier wrote:
Fellow Tuners,
In a nasty blast a few weeks ago on the Bay, Carlos' mast suddenly went sideways, outers parted at the top and inner at the bottom. Amazingly mast is fine (and so are all the crew). So I need to replace Carlos' standing rigging, and someone suggested Dyform or "compacted strand" wire. They are both SS wire but pack a bit more steel into the same diameter (I think) and are therefore somewhat stronger and less stretchy.
Does anyone have experience with either of these - or know whether they are legal, for that matter? For reference, this is what I see in the current rules (first entry is in main body, second entry is in checklist):
14. Wire rigging shall be of the same dimensions and materials as supplied by factory except as to lower shrouds. Turnbuckles must be not less than factory specifications as to dimensions and materials. No rod rigging is permitted. It is suggested that boats sailing in heavy air replace the factory supplied 5/32” lower shrouds with 3/16” wire. B. Standing Rigging 1. All rigging is 5/32” SS wire. Lower shrouds 3/16” max. No rod rigging
Thanks much,
Jan Grygier
Carlos, Hull 320/sail 5020
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