Screw Propeller
Engineering
A submerged propelling wheel. It is virtually a section of a screw of two or more threads or helices, each blade representing a thread.
Left-hand Screw Propeller. A propeller which revolves from the starboard to the port side during the upper part of its revolution while the engines are working ahead.
Right-hand Screw Propeller. A propeller which revolves from the port to the starboard side during the upper part of its revolution while the engines are working ahead.
