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Technology


Unobtanium no more


Whisper it... one of the most perfect materials for demanding marine applications is no longer the exclusive preserve of elite racing programmes Above: a


warm sunset reflects off a Ti64 titanium padeye and bolts on the Gunboat 60 Moonwave. Left: Ti64 uses more than 50 years of combined mechanical and


Advances in composite materials and high-modulus rigging fibres in the last few decades have gone far to reduce, if not eliminate, the use of metals on many performance yachts. Aluminum alloys are light, but are soft and can be corroded, and stainless steel is often deemed too heavy for its application strength. There is one type of metal, however, that may reverse this trend because nothing else can provide such high strength, light weight and extreme durability in a small footprint that also needs to deliver reliability and performance. The team at Ti64, based in Austin, Texas, specialises in working with this


74 SEAHORSE unique metal: titanium.


For decades titanium had been considered too exotic for general use due its rarity and fabulous expense, and for good reason: it alone delivers superior yield, tensile and fatigue strength that in alloy Ti-6Al-4V (an alloy that has six per cent aluminum and four per cent vanadium, referred to as Grade 5) is up to 200 per cent greater than 316 stainless and yet 45 per cent lighter. Compared with 6061 aluminum, it is 35 per cent heavier but has twice the strength-to-weight ratio. In the west, during the Cold War, only military contractors with budgets in the billions could afford to use this


metallurgical engineering and design experience in the


development of every product. Left: Finite element


analysis (FEA) and testing identifies the exact points of high and low stress on a given product


amazing material, and hence its place in metals mythology. Given this, recreational use in the past was pretty rare, although enough was found in 1967 to fabricate and graft on a titanium top section of the mast of Intrepid and give her the superior speed she needed to be the only 12-Metre to win the America’s Cup twice, both in 1967 and 1970. Two decades later in the post-Cold War era titanium started to become more widely available and affordable in a classic trickle-down of technology from the expensive aerospace arena to the everyman, and as the prices dropped, its uses and applications have expanded accordingly. Even a decade ago Apple’s MacBook model laptops featured thin titanium covers. Taking advantage of this trickle- down, the team at Ti64 has amassed more than 50 years of combined metallurgical and engineering experience in working with this wonder metal, and is pledged to help a wide variety of customers who want high quality and high performance, but not at high pricing. Most of their


CREW MOONWAVE/SOPHIE BRE


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