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onduty

A Bit More ... Speed Confusion

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Sorry guys, I know I had started another similar topic about the Dc-6 speeds which resulted in a very knowledgeable debate.

This time my question is more simple: What can you read off the PMDG DC-6 ASI? IAS or TIAS?

The speed limit placard (just noticed) on the instrument panel speaks about "True Indicated Airspeed (TIAS)" On the face of  ASI the title is simply "Air Speed".

In the PMDG manual, in the  limitations section there are two speed columns titled IAS and TIAS.

Could somebody clarify? It would be interesting to know the devs opinion.

 

Cheers,

 

Tamas

 

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1 hour ago, onduty said:

What can you read off the PMDG DC-6 ASI? IAS or TIAS?

The gauge is an airspeed indicator, you always read IAS from the gauge.  TIAS is a term not used as much today, it is actually EAS or Equivalent Airspeed, which is indicated airspeed compensated by the effects of air compression but is basically the same as CAS Calibrated Airspeed below 200 kts.  Calibrated airspeed, of course, is IAS corrected for system errors.  TIAS is not something a pilot has ready access too.... you always fly the airplane with reference to IAS.

This came up a few weeks ago, which is the only reason I can speak to it in any detail:

 


Dan Downs KCRP

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