A guara is a hardwood centerboard used in Andean rafts.Sanders, R When Thor Heyerdahl was delighted to be wrong: The Case of the Guara or Centerboard, published in Fall 2003 issue of 21st Century Science & Technology, retrieved on Jan 24, 2015 The Tangaroa Expedition outperformed Kon-Tiki in part due to using guaras.
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