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- [e]xperiments with replicas of Viking ships have shown that, somewhat depending on the hull form and cargo, under optimal conditions, with a cross wind or more to aft, they can hold an average speed of 6–8 knots over a day's voyage, and that they may reach speeds of 10–12 knots in a breeze. Moreover, they can maintain an effective speed of approximately 2 knots at 55–60° to the wind when tacking. (en)
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