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The term's origin is difficult to verify but likely comes from simplifying the term "flanking speed" in which naval vessels would attempt to get around the sides or "flanks" of another vessel's vulnerable locations.
143:. Usually, flank speed is reserved for situations in which a ship finds itself in imminent danger, such as coming under attack by aircraft. Flank speed is very demanding of fuel and often unsustainable because of
200:. This is reserved for emergencies and as such the word "speed" is included to distinguish it from the other commands mentioned. No power setting is expressed, it being implicit that maximum power is required
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Watch
Officer's Guide: A Handbook for All Deck Watch Officers
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