Variable Pitch
A type of propeller that has adjustable blades for varying speeds or directions, and may be able to reduce drag when under sail.
Variation ...
A propeller having blades that fold up when not in use to reduce drag. Also see feathering and variable pitch propellers.
following sea
A sea with waves approaching from the stern of the boat.
feathering - A propeller that can have the pitch of its blade changed to reduce drag when not in use. Also see folding and variable pitch propellers.
 See also: Boat, Counter, Drag, Flashing, Light
  
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