This paper reviews the performance of ice and land yachts and the factors that determine their top speeds. The data clarify a century of misunderstanding about top iceboat speeds and serve as background for discussing the design and performance of the author.s land yacht, the Iron Duck. This yacht was built as an amateur project and holds the world record for speed in a land yacht at 116.7 mph. It appears that it is, currently, the fastest sailing yacht on any surface. Finally, the paper provides perspective on a variety of aspects of speed sailing on dirt and ice.

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