Why does the Australian Navy use Revolutions XX00?
Does Revolutions XX00 mean the RPM of the propeller shaft?
Why do the crew talk about propeller shaft RPM? What are they communicating?
In The Last Ship that features the USN, I never heard this metric. Sea Patrol (2007) portrays the Australian Navy. s02e03 Episode Script | SS
Port 10, steer 315, revolutions 1800.
Alright, that gives us All under control, sir. Revolutions 2000.
[At 43:55/45:00] Up ahead, both engines. Revolutions 1800.
Sea Patrol (2007) s02e13 Episode Script | SS
Take us round the headland.
Half ahead both engines.
Revolutions 1000.Bring us up to full steam.
Half ahead both engines.
Revolutions 2000.I've got it, Nav.
Half ahead both engines.
Revolutions 2000.
Best Answer
As Paulie_D has stated, Revolutions is short for Revolutions-Per-Minute. Your ship example is not as uncommon as you think. Many industries put more emphasis on RPMs to measure power output than they do on the actual work done. RPMs is a much more consistent way of measuring power output when the power is being supplied to an array of variable gears or working against a fluid and/or dynamic medium like air or water.
An example of this is the car racing culture. Your average daily driver puts the speedometer as the main performance instrument. On the other hand, a race car will have the Tachometer as the main and usually largest and most central performance instrument. Aircraft base most of their performance calculations on RPMs and manifold pressure. Cyclist will focus their attention on cadence (RPMs), using that to convert their energy output to watts.
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Answer 2
Does Revolutions XX00 mean the RPM of the propeller shaft?
Yes, it does
Why do the crew talk about propeller shaft RPM? What are they communicating?
Because they know from experience what revolutions will produce the correct amount of power will produce a specific speed in the water.
It no use to the engine room to tell them "Make speed 25 knots" because it will mean nothing to them.
Tell them to set the engine to specific power setting they can monitor is simpler and more precise.
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