IF you're going to venture to the iciest ends of the earth by yacht you need a chunky steel boat, right? A floating tank sounds about right for navigating icebergs. Well, not according to professional explorer Mike Horn, who chose a nimble 118ft aluminum sailing yacht to be his constant companion on more than a decade of global adventures. "Aluminum is not as resistant as steel," he says, "but when I have a massive impact my boat just changes shape - aluminum bends, while steel tears."
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