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West Wight Potter Mailing List maintainer
dfarrell@ridgecrest.ca.us
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"Safety wire" is used everywhere on airplanes. The wire used is soft enough
that it is not prone to vibration failures. Airplanes are subject to much
more vibration than sailboats, but I've never encountered a safety wire
failure on my own airplane or on Navy planes I worked on. The bolts that
attached the propeller of my Ercoupe were safety wired. Safety wire is used
for aircraft turnbuckles also, as the following indicates:
AC No: 20-45
AIRCRAFT SAFETYING OF TURNBUCKLES ON CIVIL AIRCRAFT
Date: 9/17/65
1. PURPOSE. To provide information on turnbuckle safetying methods
that have been found acceptable by the Agency during past aircraft
type certification programs.
2. INFORMATION. The following cable system turnbuckle safetying
devices have been approved, under current airworthiness regulations,
for use in civil aircraft:
a. Clip locking devices specified in military standard MS 33736;
b. Double-wrap safety wire as specified in military standard MS
33591; and
c. Turnbuckle safetying devices meeting TSO-C21.
George S. Moore
Director Flight Standards Service
(Of course lateen rigs don't need no stinkin' turnbuckles.)
Harry Gordon
P14 #234, Manatee
Mountain View, CA
Judy wrote:
>I gather you're suggestion is to run a single wire through both turnbuckles?
>We never considered tying the turnbuckles to each other. I've never seen
>that before on boat rigging. Interesting idea... I don't see why it
>wouldn't work, from a physics point of view, as long as the other end of the
>wire attached to the mast couldn't rotate. That kind of setup would
>certainly keep the bodies from turning and loosening while trailering.
>
>You'd have to to use a very flexible wire or thin cord, and leave a slight
>slack in the wire, so there's no tension on it when the rigging moves
>around. Over time, I think the wire would become brittle from constant
>flexing during trailering, so I'd probably still want to use locknuts and
>rigging tape. The wire could be a good backup system to the locknuts,
>especially .
>
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