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10-01-2009, 02:30 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Why degrees Celsius?
In another thread question why NM vs MPH IronFlight wrote:
Quote:
Originally Posted by Ironflight
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...)
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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?
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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10-01-2009, 02:58 PM
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Join Date: May 2009
Location: Lincoln Boro, PA
Posts: 55
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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 
__________________
Rob Thompson
Lincoln Boro, PA
RV-7 Empennage
N523LG reserved
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10-01-2009, 03:04 PM
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Join Date: Aug 2008
Location: North Central TX, via Taylorsville, GA
Posts: 87
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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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10-01-2009, 03:13 PM
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Join Date: Nov 2005
Location: AUSTRALIA
Posts: 749
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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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10-01-2009, 03:16 PM
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Opulence, I has it...
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Join Date: Jan 2005
Location: TX
Posts: 830
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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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Joe Ferraro
DFW, VAF #17
SOLD
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10-01-2009, 03:22 PM
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Join Date: Jun 2006
Location: Ottawa, Ontario, Canada
Posts: 2,116
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Quote:
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Many people like to use mph because the numbers are bigger....
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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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Phil
RV9A (SB)
Flying since July 2010!
Ottawa, Canada
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10-01-2009, 04:21 PM
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Join Date: Jul 2006
Location: Corvallis Oregon
Posts: 3,547
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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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10-01-2009, 04:25 PM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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Celcius and Zulu time. It would not hurt my feelings to loose them both.
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order.
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10-01-2009, 04:26 PM
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Join Date: May 2005
Location: Santa Barbara, CA
Posts: 1,324
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Dude! push the power up...
Quote:
Originally Posted by prkaye
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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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
Happily cruising around at 325
RV8 N18U "Sunshine"
KSBA
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10-01-2009, 04:27 PM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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Quote:
Originally Posted by Finley Atherton
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)
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This from a guy that is standing upside down, and flies inverted all the time. 
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order.
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