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Flightgear Saab JA-37 Viggen Changelog
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1.0
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Got the idea to work on this plane.
JSBSim FDM and engine adapted from Aeromatic output
Flight controls mainly from F-16 (adjusted some values)
Engine fire, smoke and other effects adapted from F-16
Added thrust reverser
Converted 3D model from MS-FS2004 (License: Creative Commons)
Added some annunciater sounds
Adapted some crash code from Mig-15

1.1 
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Fixed paths to work on Linux and Mac
Renamed folder to JA37 from ja37
Made all paths relative
Removed extra copies of model and textures

1.2 - 2013 Feb 15
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Put in a Accelerometer (small inaccuracy due to my limited painting skill)

1.3 - 2013 Feb 16
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Mapped fuel tanks to match the real aircraft
Put in a generic Canvas HUD
Put in a Chronometer from Buccaneer, to make it look less empty

1.4 - 2013 Feb 16
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Canvas HUD made brighter, and some details from orig plane added
Flight Dynamic Model now partly made by DATCOM. (drag & lift mainly)

1.5 - 2013 Feb 17
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Made texture a bit prettier
Made new splash image and thumbnail
Removed some debug messages

1.6 - 2013 Feb 19
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Made HUD pretty much function like the JA-37 (except for combat and landing)
Lowered pilot view 5cm to better align with the HUD

1.7 - 2013 Feb 21
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Added more info to the changelog.
Made HUD heading be a scale
Put in horizon line and pitch lines
Fixed some HUD bugs
Cleaned up the nasal HUD code a bit
Lifted pilot view 2cm
Switched HUD font, which fixed an alignment canvas bug
Made several adjustments to the HUD

1.8 - 2013 Feb 23
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Fixed small timing problem in HUD heading scale

1.9 - 2013 Feb 23
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HUD heading and alt scales ends now smothly comes into view 
Made altimeter calibrate only if plane not moving
Altimeter indicators are now drawn instead of characters
Altimeter scale is now slightly more compressed

1.10 - 2013 Feb 23
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Improved nasal HUD comments, and beautified the script
Changed 3D model to DATCOM generated one, due to possible license issue with other model, please stop using prior versions of this plane due to that.

1.11 - 2013 Feb 28
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Switched to Anders Lejczak's 3D model. (adapted it from Poser, relicensed to GPL 2)
Adjusted many things in model, and xml positions.
Adjusted materials for metal and glass.
Animated the rudder, elevons and flaps.
Made gears invisible when pulled up
Added strobe to model, and adjusted effect
Added navigation and beacon lights.
Made livery selection (Standard and Ground-Attack variant)
Removed the fly-by-wire system again
Adjusted AeroRP and CoG
Modified splash images
Removed smoke from wingtips
Adjusted exhaust smoke

1.12 - 2013 March 3
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Added cannon bullets and flares
Fixed Km/h airspeed was converted from knots opposite
Added normal map
Flipped normals on gear, some missile ends and canopy
Removed vertex colors on fuselage
Seperated closed gear doors and left gear
Animated gear doors and left gear
Fixed altitude numbers on high scale was floating point in 2.11
Added to fgdata GIT clone

1.13 - 2013 March 7
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Animation: Added proper animation of front and right gears
Animated front and right gear
Made fuselage less shiny to look more like military painted metal.
Adjusted stall warnings to alpha values from plane manual
Adjusted max sidewind indication to 30 kts, as per Draken, since I do not know Viggens.
Improved the stall warnings and made them louder.
Made chase views distance default.
Moved the HUD down and closer to pilot. Also fixed a xml bug.
Fixed '77' and 'QFE' symbols in HUD sometimes were displaced.
Updated wheel contact positions to new model.
Applied normal map and livery to new names of gear.
Work-around for shader bug
Upgraded the aircraft status
Changed the aerodynamic wing and canard profile. It can now takeoff at 300 Km/h.
Put in values for very high alpha to better simulate stalls.
Made stall warning audible in external view.
Changed lift and drag from DATCOM to graph data.
Fixed that droptank fuel was calculated into internal fuel tanks.
Switched afterburner to method 2.
Adjusted lift and drag from flaps, now almost match takeoff speed of 250Km/h as per the manual.
Fixed white on droptank
Set flaps position max to 30 degrees as per manual
Moved CoG 1 meter back as per document
Moved aerodynamic ref. point. further back than CoG as per document
Removed russian chronometer
Adjusted G-meter to new cockpit.
Made key 's' autostart and stop

1.14 - 2013 March 13
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Upgraded aircraft rating.
Put in aerodynamic tables for Roll Moment coefficient due to roll resistance, Pitch moment due to alpha and Yawing moment induced by banking.
Added lots of low speed aerodynamic tables from NASA document, wont fly properly anymore :(
Flipped normals on glass and made it single sided.
Added data to modify drag at higher speeds.
Adjusted turbine fan sounds, and made gear sounds work.
Added fuel gauge adapted from Draken
Made cockpit panel grey.
AeroRP and CoG, finally in the right places.
Temporary removed estimates. Fixed some interpretations of the tables and added one.
Refined aerodynamic yaw and pitch moments.
Converted aerodynamic data to body-frame
Added aerodynamic effects of lift due to elevons, flaps and ground effects
Added aerodynamic effects of pitch due to flaps and ground effects
Added aerodynamic effects of roll resistance due to ground effects
Made key to toogle yaw damper on/off

1.15 - 2013 Nov 9
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Fixed yaw damper was off by default

1.16 - 2013 Nov 10
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Updated the splash and thumbnail images

1.17 - 2013 Nov 29
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Sim: Made engine use fuel from minor tanks also.
Sim: Added flightrecorder support.
Aero: Drag due to mach, gear, flaps, elevons and groundeffect.
Aero: Wheels brake now is better able to hold plane shortly at augmented thrust.
Sim: Made engine consume fuel in more realistic order from fuel tanks.
Sim: Changed startup fuel tank contents.
Animate: Fixed that afterburner flame was shortly seen at nose, when entering augmented thrust.
Animate: Adjusted afterburner flame colors and made its size depend on exhaust nozzle opening size.
Engine: Made afterburner thrust depend on mach and air-density from real RM8B values.
Engine: Made augmented thrust toggle in at 99% thrust instead of 50%.
Engine: Reduced reversed thrust to half of mil-thrust and no afterburner when in reverse.
Aero: During normal flight, flaps is now kept at 4 degrees above the neutral position. Neutral position when battery off.
Animate: Fixed bug in flare release.
GUI: Added more info to aircraft help

1.18 - 2013 Dec 1
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Animation: Removed the stutter when switching to outside view for first time.
Engine: Made idle and mil thrust depend on mach and air-density from real RM8B values.
Aero: Removed speedbrake controls, as per the mid 1980'ties upgrade.
Animate: Seat up/down was bugged, is removed, would skew the precisely calibrated view through HUD anyway.
Sim: Aerodynamic effects tested, and airplane FDM rating upgraded to 4 from 1.
Sim: Airplane Systems rating upgraded to 1 from 0 after testing generic autopilot.
Sim: Fixed airplane Model rating upgraded to 3 from 2.
Sim: Airplane status upgraded to beta from alpha, due to combined status value of 9.

1.19 - 2013 Dec 9
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Effect: Made engine fire emission, depend on thrust.
Effect: Made new animation for transmach vaporcone.
Effect: Made new animation for strake vortexes.
Sim: Fixed aircraft was not placed correctly at end of runway.
Sound: Fixed some model and cockpit sounds had same tag name.
Sound: Made sound play for turning on battery and systems.
Sound: Fixed runway rumble heard all the time in cockpit.
Sound: Made fly-by view engine sounds better.
Sound: Made cockpit view engine sounds better.
Animation: Made engine heat darker at lower thrust.
FDM: Made aerodynamic drag table more accurate.
Sim: Added structural G limits.
Aero: Increased realistic fidelity of elevator effect on pitch.
Cockpit: Added subtle noise to dashboard to make it appear less dull.

1.20 - 2013 Dec 16
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Sim: Made the crash code work properly.
Engine: Fixed a minor bug in reverse-thrust code.
Model: Size of all textures is now power of two.
Sim: Fixed thumbnail picture was wrong size.
HUD: Removed output in console about missing HUD file.
HUD: Fixed 'Invalid number of arguments' in FG 3.0.0
Sim: Moved start-offset-m property from Nasal to XML.
Sound: Removed nasal sound system reinit code.
Sim: Fixed wrapping sentences in the aircraft help.
Engine: Fixed alignments in RM8B IdleThrust and AugThrust tables.

1.21 - 2014 Jan 16
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Sim: Made crash code depend on real speed instead of airspeed.
HUD: Fixed that rain and snow is not shown though canvas HUD.
Aero: Added pitch moments for higher and lower alpha values.
Sim: When crashing the replay is no longer turned off.
Sound: Removed the stall warnings, replaced with high alpha warnings that work approx like the pilot manual describes.
Sim: Made flightrecorder track more properties, so sound and animation will function better in replay.
Sim: Made crash code script pause when replay is in progress.
Engine: Calculated new values for mil-thrust. It is now less powerful.
Sim: Enabled animations when viewing the plane in multiplayer.
Animation: Registered the cockpit glass as transparent.
Effect: Adapted for Rembrandt. (Afterburner flame will not be transparent in Rembrandt though)
HUD: Put a limit on the HUD script update speed.
Engine: Adjusted RB8B engine to JT8D-17A specs, since its the same engine plus afterburner.
Effect: Fixed engine smoke would come out at nosecone when thrust reversed.
Sound: The alpha warnings should now stop after crashing.
Sim: Wing tanks now lose content after structural break.
Sim: Structural points now have less tendency to make the aircraft bounce at collision.
Effect: Made trail of engine smoke come out after engine.
Animation: Made canopy able to open.
Sim: Is now not able to restart engine after crash.
Animation: Fixed flaps was missing important polygons.
Animation: Tilted the dashboard.
Animation: Made the dashboard support thinner and retracted it a bit.
Effect: Fixed wierd shadow in front of vtail.
Effect: Adjusted the engine fire position and size.
HUD: Made HUD not visible from afar.
Animation: Made droptank fins visible from right side also.
Effect: Adjusted trans-mach vapor cone, to better match the plane.
Sound: Decreased volume for gear rumble and canopy.
Effect: Made right navigation light green instead of blue.
Effect: Added glow effect to lights.
Effect: Made Rembrandt somewhat able to animate the emission of engine light.
Sound: Made model view engine sound a little better
Aero: Made axial coefficient more accurate.