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Astern propulsion does not necessarily imply the ship is moving astern (in reverse); astern propulsion is used to slow a ship by applying a force in the direction of the bow of the ship, instead of the stern. The equivalent concept for an airplane is thrust reversal. In a sailing ship astern propulsion can be achieved by the appropriate ...
Astern (adjective): toward the rear of a ship (opposite of "forward"). [9] Athwartships: toward the sides of a ship. [1] Aweather: toward the weather or windward side of a ship. [10] Aweigh: just clear of the sea floor, as with an anchor. [11] Below: a lower deck of the ship. [1] Belowdecks: inside or into a ship, or down to a lower deck. [12]
Propeller walk single propeller in reverse. Propeller walk (also known as propeller effect, wheeling effect, paddle wheel effect, asymmetric thrust, asymmetric blade effect, transverse thrust, prop walk) is the term for a propeller's tendency to rotate about a vertical axis (also known as yaw motion).
Slow ahead/astern, the number of revolutions is standardized for the individual ship and is unstated; Half ahead/astern, accompanied by an order for a power setting (e.g., "half ahead both engines, revolutions 1,500") Full speed ahead/astern. This is reserved for emergencies and as such the word "speed" is included to distinguish it from the ...
No ICS meaning as single flag. Prior to 1969: "The way is off my ship; you may feel your way past me." Distance (range) in nautical miles. S Sierra: Argent, an inescutcheon azure "I am operating astern propulsion." [b] Speed (velocity) in knots T Tango: Tierced in pale gules, argent and azure "Keep clear of me." [b]
No ICS meaning as single flag. Prior to 1969: "The way is off my ship; you may feel your way past me." Distance (range) in nautical miles. S Sierra [siˈɛrə] "I am operating astern propulsion." [b] Speed (velocity) in knots T Tango [ˈtaŋ.goʊ] "Keep clear of me [b]; I am engaged in pair trawling." Local time.
the ability to move astern (in reverse) much more efficiently (fixed props perform very poorly in astern); the ability to "feather" the blades to give the least resistance when not in use (for example, when sailing).
Lift on a sail (L), acting as an airfoil, occurs in a direction perpendicular to the incident airstream (the apparent wind velocity, V A, for the head sail) and is a result of pressure differences between the windward and leeward surfaces and depends on angle of attack, sail shape, air density, and speed of the apparent wind.