Problem Dynamic Pressure DG-IV vs XR-5

[Lanzfeld]

With Orbiter 2010 extending the height of the atmosphere above Orbiter 2006 I took the DG up to a 180 km orbit and saw that there was a trace of dynamic pressure. Cool. An orbit that will decay.

I did the same with the XR-5 but the instrument shows zero dynamic pressure at the same orbit height. Any ideas? Both instruments read the same decimal places.

 

[Urwumpe]

With Orbiter 2010 extending the height of the atmosphere above Orbiter 2006 I took the DG up to a 180 km orbit and saw that there was a trace of dynamic pressure. Cool. An orbit that will decay.

I did the same with the XR-5 but the instrument shows zero dynamic pressure at the same orbit height. Any ideas? Both instruments read the same decimal places.

Dynamic pressure is 0.5 * density * velocity^2

So, as you can see, the velocity has a much stronger effect on it than the density. Ergo:

Did you compare the dynamic pressure at the same velocity and the same altitude?

 

[Lanzfeld]

Yes both craft were in the same orbit. About 180 km with eccentricity near 0.

It is like the XR-5's instrument was never updated for Orbiter 2010? I cant think of why it wouldn't register otherwise.

I have sent an email to the XR-5 programmer.

 

[Urwumpe]

Yes both craft were in the same orbit. About 180 km with eccentricity near 0.

It is like the XR-5's instrument was never updated for Orbiter 2010? I cant think of why it wouldn't register otherwise.

I have sent an email to the XR-5 programmer.

Dynamic Pressure is included in Orbiters API since at least 2006.

 

[Lanzfeld]

Yes but it ended at around 80 km or so in Orbiter 2006.

It wasn't until Orbiter 2010 that it was raised to 200 km or there about. <----not sure of upper limit but DG-4 shows trace of dynamic pressure at 180km and XR5 does not.

 

[Urwumpe]

Yes but it ended at around 80 km or so in Orbiter 2006.

It wasn't until Orbiter 2010 that it was raised to 200 km or there about. <----not sure of upper limit but DG-4 shows trace of dynamic pressure at 180km and XR5 does not.

Are you sure the data uses the same unit?

 

[Lanzfeld]

Will check. BTW I am talking about the SECONDARY HUD data (X.XXXX), not the gauge.

 

[Urwumpe]

Will check. BTW I am talking about the SECONDARY HUD data (X.XXXX), not the gauge.

I have no Orbiter here and won't be mentally close to an Orbiter installation until Sunday... I have to do it all from the top of my head.

So please bear with me, should I be asking some trivial questions I might already have answered myself. :tiphat:

 

[Ripley]

Will check. BTW I am talking about the SECONDARY HUD data (X.XXXX), not the gauge.

Well, in that case open your XR5VanguardPrefs.cfg file, scroll near the bottom and look for this snippet:

###########################################################################
#
# Defines the color and fields for all five SECONDARY HUD modes
#
# Each mode has fourteen cells: seven rows and two columns.  
# Column L=left, R=right.  Rows are numbered 1-7.
# Each mode has a color set in RGB (Red/Green/Blue) format; each is 0-255.  e.g., 243,17,17
#
# Example:
#    To define the left and right side fields for row #1:
#        row1L={field}, {units}   
#        row1R={field}, {units}

 

[Lanzfeld]

Are you sure the data uses the same unit?

You, sir, are a scholar.

The one on the DG4 is in pa
The one on the XR5 secondary HUD is in PSI

Not sure of the relationship between those two but you solved my problem. Read the frikkin' gauge! eh!

 

[Urwumpe]

Not sure of the relationship between those two but you solved my problem. Read the frikkin' gauge! eh!

1 PSI is roughly 6900 pa.

 

[Lanzfeld]

Thank you!:thumbup:

Hehe...I feel like ----->:facepalm: