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September 30, 2011
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HUD by Cigognes HUD by Cigognes
HUD stands for Head-Up Display, an electronic device that gives the pilot all the needed information without having to bury the eyes inside the cockpit. By that mean, the pilot can track his target with more efficiency.

Picture taken during a 2+2 CAP (Combat Air Patrol), AP (autopilot) selected, 27900 ft altitude, 321 IAS (Indicated Air Speed), Mach 0.81, heading 323.

Over cloudy France, 2008.

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:iconcaspianseamonster:
CaspianSeaMonster Featured By Owner Sep 1, 2013  Hobbyist General Artist
Indicated airspeed in meters per second I assume?  That's the only way Mach 0.81 makes any sense...
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:iconcigognes:
Cigognes Featured By Owner Sep 2, 2013
IAS is in knots, which differs from the ground speed.
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:iconcaspianseamonster:
CaspianSeaMonster Featured By Owner Sep 2, 2013  Hobbyist General Artist
321 knots should only be around 0.5 Mach though, unless I'm doing my math way wrong.  hmm
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:iconcigognes:
Cigognes Featured By Owner Sep 3, 2013
You're right, but you forgot the pressure, which is weaker the more you climb ;)
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:iconcaspianseamonster:
CaspianSeaMonster Featured By Owner Sep 3, 2013  Hobbyist General Artist
Nope, I used this calculator and plugged in the altitude - it would be more accurate with ambient temperature instead but I'm not going to hazard a guess on that. 321kt (369.4mph) IAS at 27,900ft altitude shows 0.539 Mach.  I know variance in air temperature will change that but I'd be very surprised if it made that much difference; I don't know, maybe it does.  321m/s (718mph) reads 1.048 Mach so that doesn't make sense either.  There could also be something wrong with the calculator but as it's a NASA application I sincerely hope there isn't.  (I'm not accusing you of not knowing what you're talking about, just trying to understand and figure this out.)

I know the ICAO insists on using SI units for everything but altitude, I guess using knots for IAS on the Mirage is a NATO STANAG thing?  I've been told the general HUD layout is standardized and it certainly seems that way (I'm not a military pilot by any stretch of the imagination, I just spend a lot of time in DCS flying the Warthog.)  Also as far as I know all Russian and Soviet aircraft have all their readouts in metric - that for me, combined with the heinous crime against nature that they call an attitude indicator, makes the Su-25T sim pretty much impossible to fly.  :O
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:iconanzac-a1:
Anzac-A1 Featured By Owner Nov 19, 2013
I believe that the 321 is the heading, as the compass at the top is between 320 and 330, about where 321 would be. Also, I think that in the top right-hand corner, it says 27900, which I'm guessing is 27,900 ft.
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:iconcaspianseamonster:
CaspianSeaMonster Featured By Owner Nov 20, 2013  Hobbyist General Artist
The 27900 is the altitude in feet, yes.  I already said that.  The location of the 321 makes sense for the airspeed if the decimal number directly below it is indeed the Mach indicator.  The A-10 HUD is laid out roughly the same way - altitude on the right, airspeed on the left with Mach number directly below it in smaller lettering (Mach number is optional and has to be selected in the IFFCC settings; it isn't normally displayed for probably obvious reasons,) and the magnetic heading is only displayed as a tape, not an actual number.
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:iconmartiansummer:
martiansummer Featured By Owner Sep 29, 2012  Hobbyist Digital Artist
You are one lucky man.
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:iconmyname1z4xs:
myname1z4xs Featured By Owner Nov 2, 2011
A real HUD, not a screen from Ace Combat :la:
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:iconlongbow986:
LongBow986 Featured By Owner Oct 28, 2011
beautiful!!!
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