Although the Scandinavians learned about sail very early, they did not start to use it on their ships until the 8th century. Why not?

Viking ships were built by the Scandinavians during the Viking Age (c. ... Although before the Viking Age most boats had their planks lashed together, ... The addition of oars and sails gave Viking boats an advantage over all other ... does not mean they did not exist earlier on, however!) until the 10th century.

Hope this helps.

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