The internal fiber, which ensures the specific performance of the cable, is pre-tensioned starting from bobbins and is wrapped, with a technique called “sling”. This process is based on continuous winding of the fiber, between two fixed points, until the reaching of the desired number of filaments. Successively this loop is joined, consolidated and protected by two different layers of special tape, which warrants stability and protection against external agents. Finally, a strong braid in Dyneema® covers the entire cable, giving to it the definitive appearance, while the two terminals in resin are melted at the ends of the cable, with the permanent inclusion of the technical fiber loops.
During the sailing, the wind hits the cable and produces a negative friction power for the performance of the boat: the higher is the front-surface of the cable, the greater is the friction. In the years, many cable solutions have appeared on the market, with an asymmetric aerodynamic section, following the consideration that a form, more aerodynamically efficient, ensure lower friction.
This is generally correct, but only if the aerodynamic section is oriented as regards the apparent wind angle (AWA). Various studies have proved that in case of AWA above 25°, cables with asymmetric section start to generate more friction than the cables with circular section, and that the friction grows exponentially at the increasing of AWA. All composite cables, that are produced from Armare, have a circular section. The graph shows the trend of the curves of the three considered profiles, as to say elliptical, circular and rotary section.
The profitable trend of the cable with elliptical section is limited to a range of AWA below 20 Kts, over which the wind resistance increases exponentially, and makes them disadvantageous compared to cables with a circular section.
The processing of continuous multifilament high modulus fibres, is currently the most technologically advanced construction in the world for the production of fiber cables.
Armare has developed a complete line of products to be used on racing/cruising boats and super yachts. The construction process of the Softrig cables is named “Sling”. This process is based on continuous winding of the fiber between two fix points placed at the required distance. The result is an extremely safe single cable, with inimitable mechanical characteristics. This special construction, accurately controlled with sophisticated equipment, produces the highest modulus of stretching and the maximum lightness. It allows the cables to get exceptional breaking loads both under static and dynamic loads, and to face unforeseen peaks of stress.
The continuous development of construction techniques allows Armare to produce perfectly balanced cables, which are extremely safe and have an excellent durability. Intensive tests and exhausting sailing session, such as the participation to Vendee Globe, confirm the absolute reliability of our products, both in cruising and racing sailing boats of different sizes.
Armare cables are manufactured using all the latest fibers available on the market. For each specific application is important to identify the correct technical fiber, which composes the core of the cable, depending on the expected performance, the final use and the quality-price ratio. The fibers used for the construction of the cables and for high performance rigging applications are identified by Pbo®, Aramid and UHMW-PE initials, from which originate the commercial names of PBO-Zylon®, Kevlar® and Dyneema®.
In the last years PBO® has achieved excellent levels in terms of performance and durability, when is employed to build the core of the cables for rigging use. Thanks to the incomparable dimensional stability of its oriented fibres, PBO® is the top in terms of performance under statics loads. It represents the best choice for the manufacturing of high performance standing riggings, because it assures maximum lightness together with minimum possible diameter, steadiness, resistance and zero creep. Armare suggests choosing PBO® for standing rigging, for forestay and backstay, and for torsional cables, where high performance are always required.
Armare also produces cables made with Kevlar® 49 core, using the same Sling technology, the equal assembly methods and the identical materials as for the production of PBO® cables. The performance of Kevlar® 49 cables is lower compared with cables made with PBO®, but have the same high durability, high breaking loads and low stretching, maintaining reasonable diameters and reduced weight. The price makes these cables more accessible, in particular on cruising boats, when better performances are required for backstays, to lighten the runners, checkstays, staysails and torsional cables.
The excellent dynamic resistance, the low elongation and the lightness of Dyneema® turn it to the perfect choice for the construction of backstays, runners and strops. Thanks to its extreme resistance to torsional cycles and to load/unload stress, this fiber can also be used to produce torsional cables. Even if Dyneema® is lighter than PBO®, it is about 10% heavier and it has a diameter 25% thicker, in comparison with the dimensioning of a cable under the same stretch. Dyneema® has a higher creep than other technical fibers, tough it is unsuitable to be used as standing rigging. It is available in two versions: SK99 and DM20.
Armare Composite Cables are manufactured using the latest fibers available on the market. For each specific application you can choose from three technical fibers, according to the expected performance of the cable.