"Technical Notice - Dyform™ Wire with Hydraulic Cylinders
Unidirectional lay wire (such as Dyform™, or “compacted strand”) is used in rigging applications where designers desire a lower-stretch solution than standard 1x19 wire rigging. Several problems result from the use of this wire including lower effective stiffness, unwinding of the
lay of the wire and unscrewing of the rigging fitting assemblies. "
Dyform wire is twisted in only the left hand direction. This construction
improves the strength and stiffness of the wire when compared to 1/19 wire of a similar diameter. However, Dyform tries to “unwind” as it is loaded due to this construction.
After several loading cycles, the Dyform wire may be significantly unwound. The residual torque from this condition can act to unscrew rigging fittings on the wire. All your shrouds are constantly loading and unloading as you sail along change tacks and bounce over waves......ok you don't get this permanent unwinding if cilinders aren't udes but you do get the wire opening up and presenting its razor sharp edges to your sails and your sheets - plus the threat of your rigging screws unscrewing.
bron:
list.sailnet.net/read/messages?id=7607
geen antwoord op je vraag maar wel aardig om over na te denken en uit te zoeken als ik voor de keuze zou staan. Nu heb ik geen van 3 maar uit deze keuze ging ik voor regulier 1 x 19
Michel
