airspeed - gauge vs. external view

[Durnox]

I wonder if I generally misunderstood something:

 

According to the manual the Airspeed Indicator shows the airspeed in IAS.

 

Yesterday I switched to the external view (F2): There the speed was about 10% lesser than shown on the gauge. I'm not sure what is displayed there - IAS, TAS, GS...but shouldn't that value be greater (or at least equal) instead of lesser? :huh:

[Flamin_Squirrel]

I wonder if I generally misunderstood something:

 

According to the manual the Airspeed Indicator shows the airspeed in IAS.

 

Yesterday I switched to the external view (F2): There the speed was about 10% lesser than shown on the gauge. I'm not sure what is displayed there - IAS, TAS, GS...but shouldn't that value be greater (or at least equal) instead of lesser? :huh:

 

It's groundspeed. So, if you're flying into a headwind, your GS can easily be less than IAS (especially at low level).

[Cibit]

Also the options give a choice of metric and imperial units of measure. The huey gives IAS in knots IIRC

[kontiuka]

Ya, you can have an IAS of 100 kts and a ground speed of 0 kts.

 

As an aside, the speed shown in the outside view is not exactly ground speed. It's the speed through the DCS World 3D space. So, you could be in a vertical climb at 800 kts and the outside view will show 800 even though your ground speed would be 0.

[Durnox]

Well, it was a level flight, so vertical speed does not matter (forgot to mention)

The external view shows knots for me - so m/s is not the reason.

 

Wind: Oh Yes - I didnt notice any wind in either direction, but ok...thats seems to be the reason. How stupid not to think about wind!? :doh:

 

Anyway: I checked it in a quick ME and there the external view showed some knots above the gauge (at 3000ft) - as expected (level flight, no wind).

:thumbup:

[b00ce]

What altitude/air temperature are you flying at? If I remember correctly DCS supports "true airspeed" vs. "indicated airspeed".