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  #1  
Old 10-01-2009, 02:30 PM
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N941WR N941WR is offline
 
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Location: SC
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Default Why degrees Celsius?

In another thread question why NM vs MPH IronFlight wrote:
Quote:
Originally Posted by Ironflight View Post
Ahhh...the eternal question!

As a trained Aeronautical Engineer, it was beaten in to me that the REAL aviation world always does things in knots, and my papers would be failed if i used any other units...

As a Commercial and Instrument Pilot, I have been trained to do everything in knots, because that is what the ATC world uses.

In the Flight operations world in which I live, we do everything in knots because that is the engineering standard (see first bullet above...)

Many people like to use mph because the numbers are bigger....
(sells more airplanes because they seem faster - same reason that $9.95 is better than $10 if you're selling somethign...)
My question is why when you listen to the current weather they give everything in imperial units (Feet, miles, etc.) except the temperature, which they give in degress Celsius. Why is that?
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  #2  
Old 10-01-2009, 02:58 PM
rjt194 rjt194 is offline
 
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Being (originally) from the UK this makes perfect sense

If you're in Russia you'll hear everything in metric.

The odditity in the US (not sure if its used elsewhere) is barometric pressure is in inches of mercury not millibars, but I'm sure I'll get used to it eventually
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  #3  
Old 10-01-2009, 03:04 PM
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cropdusterengineer cropdusterengineer is offline
 
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Location: North Central TX, via Taylorsville, GA
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Default degrees C

Probably no good reason, other that its just the standard that has been selected.

The only negative I can see is that degrees C provides a little less resolution when measuring the temperature.

CDE
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  #4  
Old 10-01-2009, 03:13 PM
Finley Atherton Finley Atherton is offline
 
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Location: AUSTRALIA
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Its just a small start to try to get you guys to catch up with most of the rest of the planet.

Fin
9A
Australia (metric)

Last edited by Finley Atherton : 10-01-2009 at 03:29 PM.
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  #5  
Old 10-01-2009, 03:16 PM
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jferraro17 jferraro17 is offline
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I'm guessing it has to do with ICAO standards... Just be glad you aren't speaking French when you fly. )


Btw, I'm with Paul on the "knots" thing--60:1 rule? Anybody? Bueller?

Joe
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  #6  
Old 10-01-2009, 03:22 PM
prkaye prkaye is offline
 
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Quote:
Many people like to use mph because the numbers are bigger....
By that logic they should be using km/hr, like we use on the roads in Canada. Those numbers are about twice as large as knots! I like telling people my plane will cruise at over 200 km/hr Highway speed limits here are half that.
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  #7  
Old 10-01-2009, 04:21 PM
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frankh frankh is offline
 
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Location: Corvallis Oregon
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Default Try being an engineer

Almost every metric unit makes SOOO much more sense than the old imperial style.

Besides a unit volume of water at room temperatur is equivilent to one unit of mass.

I.e 1 Kg of water is 1 Litre...Now almost everything is a multiple of 1000 in almost anything you do..Except pressure...1 atmosphere is 1.01*10^5 bar...

Frank
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  #8  
Old 10-01-2009, 04:25 PM
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Geico266 Geico266 is offline
 
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Celcius and Zulu time. It would not hurt my feelings to loose them both.
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  #9  
Old 10-01-2009, 04:26 PM
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John Clark John Clark is offline
 
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Default Dude! push the power up...

Quote:
Originally Posted by prkaye View Post
By that logic they should be using km/hr, like we use on the roads in Canada. Those numbers are about twice as large as knots! I like telling people my plane will cruise at over 200 km/hr Highway speed limits here are half that.
It's not "twice as large" it is close to 1.6 times statute miles. So if your RV9 cruises at 200 KPH, you are only going a little over 124 statute MPH or 108 knots. Tell 'em 300, it is only a little exaggeration

John Clark
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  #10  
Old 10-01-2009, 04:27 PM
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Geico266 Geico266 is offline
 
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Quote:
Originally Posted by Finley Atherton View Post
Its just a small start to try to get you guys to catch up with most of the rest of the planet.

Fin
9A
Australia (metric)
This from a guy that is standing upside down, and flies inverted all the time.
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