Kph true or airspeed

Pro Member First Officer
Andrew (AJWatson2209) First Officer
Joined: Aug 18, 2005 Posts: 143 Location: Edinburgh
Asked
Thu Oct 13, 2005 2:20 pm

Hi guys,

Im hoping you can help me out here, i was reading the BA fact book about their fleet and they said that their crusing speed was 927kph, now when im flying my cusing speed (which is very near the overspeed speed is only about 340 kph, im thinking it must be that one of them is in true airspeed or soemthing. Please can someone help me out here with the comfusion.

CHeers

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Pro Member First Officer
PH First Officer
Joined: Dec 10, 2004 Posts: 376
Answered
Thu Oct 13, 2005 4:51 pm

The confusion being they, BA, are quoting speeds in Kilometres per hour Groundspeed and the airspeed indicator is giving you readings in Knots (nautical miles per hour) indicated airspeed. So you are talking "different languages". While in flight flick the GPS on and you will get a groundspeed which then needs to be converted into kmh.

Pro Member First Officer
Steve (megafoot) First Officer
Joined: Apr 10, 2005 Posts: 132 Location: Central California
Answered
Sun Oct 16, 2005 7:26 pm

The world standard for navigation is Knots. Anyone who is quoting in Kilometers per hour (or miles per hour for that matter) is not quoting correctly in pilot/mariner jargon. for an explanation on what exactily a knot is go here:

http://www.onlineconversion.com/faq_07.htm

Pro Member Chief Captain
Alex (Fire_Emblem_Master) Chief Captain
Joined: Oct 19, 2003 Posts: 2325 Location: Grand Rapids, MI
Answered
Sun Oct 16, 2005 9:22 pm

You also have to understand the difference between Indicated and True Airspeed. The numbers you see on the indicator in the cockpit are indicated, when you turn on the GPS and on the bottom right or left corners, it'll say G/S and then a number. That's your ground speed, which is what you want to look at to get a better idea of how fast you really are going.

Pro Member First Officer
Andrew (AJWatson2209) First Officer
Joined: Aug 18, 2005 Posts: 143 Location: Edinburgh
Answered
Sun Oct 16, 2005 9:33 pm

Cheers guys,

I wil have a look for that in my next flight (oslo to edinburgh)

See you in the skies

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