|
-
POSTING RULES

-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|
|
View Poll Results: Do you use Knots , MPH, or Kilometers To Describe Your Speed?
|
|
I use Knots.
|
 
|
279 |
74.20% |
|
I use MPH
|
 
|
93 |
24.73% |
|
I use kilometers per hour.
|
 
|
4 |
1.06% |

01-28-2012, 05:36 PM
|
|
|
|
Join Date: Oct 2007
Location: Pensacola, FL & 2R4, Loveland, CO
Posts: 222
|
|
Mph is easier
A mile is based on 1,000 Roman paces.
A nautical mile is one minute of latitude.
Charts use latitude and longitude, and thus have distance scales all over them.
Sectionals are charts.
But if you want to use miles all you haft to do is measure the distance against the latitude scale to determine the number of minutes multiply by 6,080 (apx) and divide by 5,280.
Who uses Mach?
__________________
120500
|

01-28-2012, 05:42 PM
|
|
|
|
Join Date: Nov 2010
Location: ____
Posts: 829
|
|
Knots
The earth is surveyed in Deg, min and sec. 1 Minute of latitude is 1 NM, anywhere.
The cosine of your Lat position is equal to the decimal value of one Minute of Longitude at your current Lat.
It's the foundation of all naval and aviation navigation. 
|

01-28-2012, 05:44 PM
|
 |
|
|
Join Date: Nov 2006
Location: Bennington, Vermont USA
Posts: 1,301
|
|
Knots fit well with charts and winds.
Jim Sharkey
RV-6
|

01-28-2012, 05:46 PM
|
|
|
|
Join Date: Sep 2010
Location: Charlotte NC
Posts: 1,167
|
|
Quote:
Originally Posted by DaveLS
A mile is based on 1,000 Roman paces.
Who uses Mach?
|
True story, happened to a friend of mine instructing in a T2. The T2 was slow but could fly very high. I don't even think it had a mach meter. Flying a new student on his first cross country. Near El Paso at 39000 feet they are asked to say their Mach. The student quickly replied that he was Maching the 090 radial at 78 miles. The follow on laughter on the control freq my friend found quite embarrassing!!! A discussion with the student on the ground about the difference between Mark and Mach took place.
George
|

01-28-2012, 05:47 PM
|
|
|
|
Join Date: Feb 2011
Location: USA
Posts: 3,179
|
|
I use knots for airplanes - even a Stearman (which makes for some really sad numbers). The only time I use MPH is when talking to my mom because she can understand MPH.
|

01-28-2012, 05:47 PM
|
 |
|
|
Join Date: Oct 2008
Location: Utah
Posts: 8,151
|
|
KMH are faster
Km/h are faster come on guys I can not be alone in the poll. Who else is using metrics?
|

01-28-2012, 06:04 PM
|
|
|
|
Join Date: Mar 2005
Posts: 5,685
|
|
I use kts and mph depending on the situation
Saying speed in kts to a driver gives them a unit of measure that means nothing except in their mind the airplane is slower than it really is.
When talking to pilots and ATC I use kts.
When reporting race results I use both because you don't know the preference of the reader.
I guess I can't vote.
Bob Axsom
I voted KM/HR because it doesn't mean anything and I was tired of Vlad sitting there all alone.
Last edited by Bob Axsom : 01-29-2012 at 11:41 PM.
|

01-28-2012, 06:30 PM
|
 |
|
|
Join Date: Nov 2006
Location: Bennington, Vermont USA
Posts: 1,301
|
|
Quote:
Originally Posted by DaveLS
A mile is based on 1,000 Roman paces.
A nautical mile is one minute of latitude.
Charts use latitude and longitude, and thus have distance scales all over them.
Sectionals are charts.
But if you want to use miles all you haft to do is measure the distance against the latitude scale to determine the number of minutes multiply by 6,080 (apx) and divide by 5,280.
Who uses Mach?
|
They must have had long legs 
|

01-28-2012, 06:46 PM
|
|
|
|
Join Date: Jun 2010
Location: Sydney, Australia
Posts: 123
|
|
Knots. A statute mile per hour means nothing to me.
Aside from the minor fact it's impossible to get a plane certified here with a mph airspeed indicator, 1 knot = 1 nautical mile per hour = 1 minute of latitude per hour = graduations which are marked on aeronautical charts the world over = internationally accepted aviation standard for airspeed/tas/groundspeed.
If you can read lat/long on an aeronautical chart, then you know what a "nautical mile" is by default. If you can't read lat/long on an aeronautical chart, why are you flying a plane? I've never understood the morbid fascination with continuing to measure speed in statute miles per hour in an aircraft.
Mike
Down Under
No offence intended! 
|

01-28-2012, 07:23 PM
|
 |
|
|
Join Date: Jul 2006
Location: Corvallis Oregon
Posts: 3,547
|
|
RV's are fast enough to use Knots and get respectable numbers..well OK, not the RV12...
The serious answer is one talks to ATC continuosly while flying IFR, speed comes up quite often (either cus there is a Cessna put put in front of you or a jet behind you) and your better off using the same language.
As an engineer that is fluent in both metric and Imperial units, I have to say the metric system is by far the best.
You have no idea how hard it is for an English guy to admit that anything invented in France is better.. 
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 06:47 AM.
|