View Full Version : IAS and TAS

08-15-2004, 08:58 AM
What is the difference?

08-15-2004, 08:58 AM
What is the difference?

08-15-2004, 09:02 AM
http://www.pbase.com/image/5367023 http://ubbxforums.ubi.com/infopop/emoticons/icon_smile.gif

08-15-2004, 09:09 AM
Nice graph....

In laymans terms, True Airspeed is how fast you're actually going, Indicated Airspeed is how fast your instruments indicate you're going. At sea level they're pretty much the same (depending a bit on airpressure) but as altitude increases, IAS decreases.

There's a table in the MANUAL folder on CD2 of the FB CD's with conversion from IAS to TAS at various altitudes.

The in-cockpit instruments and the speedbar (red numbers in the lower left corner of the game screen) read in IAS and the arcade style guage you get in the no-cockpit view reads in TAS.

Stall speed, maximum landing gear extension speed, flaps extension speed etc. are all quoted in IAS. Aircraft performance figures are quoted in TAS and you need to know TAS to correctly set the He111 computing bomb sight.



Tully's X-45 profile (SST drivers) (http://members.optusnet.com.au/tully_78th/fb.zip)


08-15-2004, 09:27 AM
the Tullster has arrived http://ubbxforums.ubi.com/images/smiley/11.gif

"To fly a combat mission is not a trip under the moon. Every attack, every bombing is a dance with death."
- Serafima Amsova-Taranenko: Noggle, Ann (1994): A Dance with Death.

08-15-2004, 05:44 PM
generally indicated airspped is the important one for flying because things like stall speed remain relatively constant with IAS

TAS is more important for navigation