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 Post subject: Aicraft Speeds
PostPosted: Sat Oct 27, 2012 10:39 am 
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Joined: Sun Jul 22, 2012 5:29 pm
Posts: 2
Hi Ernie,
Are the speeds in the aircraft configuration IAS or TAS.
Thanks


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 Post subject: Re: Aicraft Speeds
PostPosted: Fri Nov 23, 2012 3:31 pm 
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Joined: Sat Mar 05, 2011 7:39 pm
Posts: 596
You asked this a while ago and it got lost in the shuffle... speeds are TAS. See the "Data Files 2.pdf" file in the \FSBuild\UserGuide subdirectory for more.

DJ


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 Post subject: Re: Aicraft Speeds
PostPosted: Thu Nov 29, 2012 7:14 pm 
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Joined: Fri Jun 22, 2012 7:46 am
Posts: 2
I dont understand how come the performance files seem to have speed in GS (ground speed) when you say that it is supposed to be in TAS? Is this a mistake?


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 Post subject: Re: Aicraft Speeds
PostPosted: Wed Jan 09, 2013 11:21 pm 
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Joined: Thu Jul 09, 2009 3:02 pm
Posts: 60
Location: Padova
Dmetrey wrote:
I dont understand how come the performance files seem to have speed in GS (ground speed) when you say that it is supposed to be in TAS? Is this a mistake?


As there are not many posts in between, even some month has gone, i believe it is useful to add some more details.

We are dealing with different speeds:

IAS INDICATED airspeed
CAS calibrated airspeed
EAS equivalent airspeed
TAS TRUE AIRSPEED
GS GROUND SPEED

Flight simulator GPS is indicating GS speed.

For calculations we use arithmetic formulas.
Without going into particulars, indicate in you aircraft.cfg IAS you well know and understand and you are done.

The TAS is said to be the same, yes but only under certain atmosfere conditions.
TAS could be a subscale indication on the IAS instrument.
TAS = IAS √ (ρ0 / ρ)

For you IAS is important. TAS is a indication that we need to calculate the Groundspeed GS.

If your interest is exceeding this explanation you must consult and study the basic understanding of groundspeed and distance as both are relating to fuel consumption.

In case you are interested in math formulas, just consult the unique web-page of 'Ed Williams' Aviation Page. Real mathematic formulas are valid for the Flight Simulator. FS is not knowing the distance between 2 Points, FS is calculating with real world application formulas taking into consideration Latitude, longitude and of course the MAGVariation. The same it is with all speed indications.

regards,
raimund
.

_________________
Forstmeier - Padova / Italy


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