Titanic in Dry Dock, 1911
Titanic had three propellers, one for each of the ship’s main engines. The outer (or wing) propellers were the largest, each carrying three blades with a total diameter of 23.5 feet (7.2 m). The middle propeller was slightly smaller at 17 feet (5.2 m) in diameter, and could be stopped but not reversed.
The rotation of the propellers was driven by exhaust steam and powered the ship through the sea.
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