Default head-up display: Difference between revisions

{{Note|The HUD system will one day be replaced by a [[Canvas HUD]] system.}}

The {{Wikipedia|Head-up display|'''Head-up display'''}} (HUD) is an important instrument in modern, mostly military, cockpits. FlightGear provides a XML-based system to relatively easily create HUDs for aircraft such as the [[F-14B]] and [[F-16]].

However, this article's focus is on FlightGear's default head-up displays. Those are available for any craft which does not include its own set. Have a look at [[#Further Information|Further Information]] if you're planning to create a HUD.

Activate the HUD with {{key press|h}}. Pressing it repeatedly moves through the configured colours and turns it off again. To change the brightness, press {{key press|Shift|h}}. Press {{key press|Shift|i}} to go through the available HUDs. Press {{key press|i}} to switch back to the first one at any time. Have in mind that some aircraft do assign one or more of those keys differently and therefore one or more function/s is/are missing on them.

Some of the head-up display's options can be altered in the menu: <code>View → Adjust HUD Properties</code>

[[File:HUD_minimal_overview.png|thumb|420px|Huds/minimal.xml]]

[[File:HUD_NTPS_overview.png|thumb|420px|Huds/NTPS.xml]]

== Features ==

; [[Aileron]]

: Monitors the bearing of the control input on the aileron's axis. Attached along the upper side is the indicator for the trim input on that axis.

: Properties: <code>/controls/flight/aileron</code> and <code>/controls/flight/aileron-trim</code>

; [[Elevator]]

: Monitors the bearing of the control input on the elevator's axis. Attached to the left the trim on this axis.

: Properties: <code>/controls/flight/elevator</code> and <code>/controls/flight/elevator-trim</code>

; [[Rudder]]

: Monitors the bearing of the control input on the rudder's axis. Attached to the bottom the trim input.

: Properties: <code>/controls/flight/rudder</code> and <code>/controls/flight/rudder-trim</code>

: Monitors the throttle input axis.

=== Instruments ===

; [[AMSL]] (Height <u>a</u>bove <u>m</u>ean <u>s</u>ea <u>l</u>evel)

: Current altitude relative to sea level in feet (ft) (1 ft = 30.48 cm).

: Property: <code>/position/altitude-ft</code>

; g-load

: The {{Wikipedia|G-force}} appealing to the pilot - to avoid black-/redout.

: Property: <code>/accelerations/pilot/z-accel-fps_sec</code> with factor <tt>-0.03108095</tt>

; [[Avionics and Instruments#DirectionalGyro|Gyrocompass]]

: This is an ideal version of a gyrocompass without the drawbacks of a real one. It shows heading of the aircraft relative to the geographical North Pole (true north) in degree (360 degree scale).

: Property: <code>/orientation/heading-deg</code>

; [[KIAS]] ('''K'''nots '''I'''ndicated '''A'''ir'''s'''peed)

: Current speed relating to the ambient air in knot/knots (kt/kts) (1 kt = 1.151 mph = 1.852 km/h).

: Property: <code>/velocities/airspeed-kt</code>

: To change the format of the displayed coordinates, go to <tt>Autopilot</tt> --> <tt>Set Lat/Lon-format</tt>.

: Properties: <code>/position/latitude-string</code> and <code>/position/longitude-string</code>

; Pitch ladder

: Displays the aircraft's pitch and roll relative to the ground's level/horizontal in degree. It's used as an artificial horizon ([[Avionics and Instruments#Attitude Indicator|Attitude indicator]]).

: Shows current altitude [[above ground level]] (AGL) in feet. Relating to the location of the aircraft's radio altimeter, it's not zero if the aircraft is on the ground.

: Property: <code>/position/altitude-agl-ft</code>

: [[Avionics and Instruments#Turn Coordinator|Turn Coordinator]]

: Active mode: <code>/autopilot/locks/speed</code>

[[File:HUD_default_gps.jpg|thumb|420px|HUD GPS]]

The upper left hand corner shows the most important information on the actual state of the GPS. Namely these are (line by line):

: the mode the GPS operates in and the active waypoint's identifier.

: the distance "D" (in nautical miles, nm) and the calculated time to this waypoint "TTW".

: the bearing "BRG" to the active waypoint and the course deviation "XTR" based on the leg from the previous waypoint.

: the current speed relative to the ground "GS".

=== Big fat arrow ===

Remains of a going to be useful instrument.

: To get rid of it, remove or comment "runway.xml" from/in <tt>$FG_ROOT/Huds/[http://mapserver.flightgear.org/git/?p=fgdata;a=blob_plain;f=Huds/default.xml;hb=HEAD default.xml]</tt>.

: To make it point to the airport selected by menu item "Tower Position", apply patches as shown [http://sourceforge.net/mailarchive/message.php?msg_id=30422572 here].

HUDs may be replaced or added by changing or adding their paths in <tt>preferences.xml</tt> or by setting the paths as command line options. To change the order of the existing ones the options would be: <code>--prop:/sim/hud/path[1]=Huds/minimal.xml</code> <code>--prop:/sim/hud/path[2]=Huds/default.xml</code>

The basic settings regarding to any HUD are set in <tt>$FG_ROOT/[http://mapserver.flightgear.org/git/?p=fgdata;a=blob_plain;f=preferences.xml;hb=HEAD preferences.xml]</tt>. Search the file for the <tt><hud></tt>-tag and you will find a list of properties.

The setup of the default HUD is defined at <tt>[[$FG_ROOT]]/Huds/[http://mapserver.flightgear.org/git/?p=fgdata;a=blob_plain;f=Huds/default.xml;hb=HEAD default.xml]</tt> and documentation can be found at <tt>$FG_ROOT/Docs/[https://sourceforge.net/p/flightgear/fgdata/ci/next/tree/Docs/README.hud README.hud]</tt>.

 

 

== Additional HUDs ==

: This is a generic HUD for helicopters, inspired by MIL-STD 1295A and the AH-64A IHADSS symbology. [http://stefan.gofferje.net/downloads/flightgear/file/6-generic-helicopter-hud Download]

 

: Designed to fly helicopters in Helicopter View it is also handy for any craft with a not yet finished cockpit. It also contains a minimalistic HUD only showing some navigational information such as compass and GPS. The [http://beggabaur.rocks/fgfs/helihud_0.3.tar.bz2 download] contains instructions and specs.

 

; V(MX)-22 Osprey HUD

: [http://stefan.gofferje.net/downloads/flightgear/file/1-hud-for-vmx-22-osprey Download]

 

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