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Viking longships, starting in the 700s AD, had a mast with a sail. To make a boat with a sail stable, a keel is needed to counteract the tipping forces the wind places on the sail. Prior to the sail being added, longships did not require or have keels.

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9y ago
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12y ago

Every boat has either a keel, a centerboard or a dagger board depending on the boat. A keel is usually on a bigger boat and it is part of the ship. It sticks a certain length below the ship into the water to stabilize the boat. A keel is fixed. A center board is the same except when not in the water it retracts itself into the hull of the boat and is usually used in a medium sized boat. A dagger board is manually removed from the boat and is used on the smallest boats.

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Q: Why was a keel important for viking longships?
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