blade or wash of an oar

The Sailor's Word-Book

Is the flat part of it which is plunged into the water in rowing. The force and effect in a great measure depends on the length of this part, when adequate force is applied. When long oars are used, the boat is generally single-banked, so that the fulcrum is removed further from the rower. Also, the motive part of the screw-propeller.

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