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Saab 37 Viggen

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Re: Saab 37 Viggen

Postby Octal450 » Mon Sep 09, 2019 7:01 pm

3) I am almost finished with a totally brand new flight control system. I am just waiting on Leto/Necolatis to finish some stuff before merge. You will then enjoy the real control system of the Viggen from manuals, schematics, etc. It has a standard hydromechanical control system with added dampers in the "STICK" (SPAK) mode.

Kind Regards,
Josh
Last edited by Octal450 on Tue Sep 10, 2019 12:00 am, edited 1 time in total.
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Re: Saab 37 Viggen

Postby Necolatis » Mon Sep 09, 2019 10:35 pm

OE-LML wrote in Mon Sep 09, 2019 6:37 pm:1) Tank selection: Is there a way to manually select which tank(s) is/are used? The plane always selects one of the left tanks first and so it starts to roll to the right.


The engine only use fuel from the main tank, But yes you are right that fuel is transferred from the left first when you fly level. This is how the system was designed but the tank is small, so it wont make you roll alot.

OE-LML wrote in Mon Sep 09, 2019 6:37 pm:2) Flaps only extend when gear is down: Is there a way to extend flaps for low speed flying?


No, it is tied to the gear.

OE-LML wrote in Mon Sep 09, 2019 6:37 pm:4) Radio navigation: At the moment I'm using the AJ-37. But where can the ADF- and VOR-"needles" be displayed? The only thing I can make work is the DME gauge at HUD.


The Viggen didn't have VOR or ADF navigation. It had DME, waypoints and TILS.

OE-LML wrote in Mon Sep 09, 2019 6:37 pm:5) Unreadable displays: On the JA-37Di version the radar and navigation display is almost unreadable if the sun is shining and the Shader options of "Model" are set to maximum. (The same is true of the F-16 too.) Is this a common issue or is this because of my old notebook graphic card with some not up to date drivers?


Do you fly with ALS? I would like to see some pictures of this problem, maybe I can improve it.
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Re: Saab 37 Viggen

Postby OE-LML » Mon Sep 09, 2019 10:59 pm

Thanks for your replies.

Octal450 wrote in Mon Sep 09, 2019 7:01 pm:You will then enjoy the real control system of the Viggen from manuals, schematics, etc. It has a standard hydromechanical control system with added dampers in the "STICK" (SPAK) mode.

Does this mean you will be supported, but you have to trim manually?

About 5): Yes, ALS is on. The problem is, that if the sun seems to shine into the cockpit, the radar screen and navigation display are very, very bright. Almost unreadable unless the "Model"-slide is fully set to the left. Sry, at the moment I'm too dumb to load screenshots up. I'm sure the F-16 is affected too. F-14 and F-15 probably as well.

CU.
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Re: Saab 37 Viggen

Postby Necolatis » Mon Sep 09, 2019 11:05 pm

Once we get compositor pipeline in FG, the shadow from the wall behind the pilot will prevent this from happening.
Until then maybe I can lower the reflected sunshine when the sun is behind the pilot.
I will try to to make it better.
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Re: Saab 37 Viggen

Postby Octal450 » Tue Sep 10, 2019 12:02 am

OE-LML wrote in Mon Sep 09, 2019 10:59 pm:Thanks for your replies.
Does this mean you will be supported, but you have to trim manually?


Correct. You have to trim, but the system damps to improve stability on q (aero pitch rate), Nz (G accel), and also has some controllers at high Mach to "sharpen" control inputs with Nz.

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Josh
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Re: Saab 37 Viggen

Postby OE-LML » Tue Sep 10, 2019 8:40 pm

@Octal:
Is the new flight control system already with the Viggen in your GitHub repository available?

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Re: Saab 37 Viggen

Postby Octal450 » Tue Sep 10, 2019 9:27 pm

@OE-LML
Check out https://github.com/Octal450/flightgear- ... n/tree/FCS
FCS branch has it.

Kind Regards,
Josh
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Re: Saab 37 Viggen

Postby Necolatis » Thu Oct 24, 2019 9:01 pm

Colin Geniet has been busy making cool updates to the Viggen, and its now on FGAddon, should be available in the 2018.3/2019.1 launcher tomorrow.

Here is some screenshots of his exterior lightning rework:

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Image

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Re: Saab 37 Viggen

Postby Necolatis » Tue Mar 03, 2020 12:14 pm

A new version of the Saab 37 Viggen was put on FGAddon/launcher yesterday.

Contains fixes mainly by Colin Geniet. He also updated the MP property system.

JA37 ver 4.317 changelog
Model: {Colin} fixed some inverted normals.
Arms: Fixed that weapons could get into perpetual starting mode.
Model: {Colin} Add large hotspots for transponder switches
Model: {Colin} Add hotspots for JA RHM and GCWS switches
Model: {Colin} Add dual hotspots to AJ switches
Model: {Colin} Add dual hotspots for AJ radio panel
Model: {Colin} Add hotspots for flood light switch
Sim: {Colin} Add exterior lights to flight recorder
Sim: {Colin} Remove deprecated exterior light properties
Sim: {Colin} Deprecate WOW MP property
Sim: {Colin} Properties gear/gear[i]/compression-norm are already transmitted in the MP protocol, and can be used instead of separate WOW flags.
Sim: {Colin} Simplify smoke and contrails MP properties
Sim: {Colin} Use MP bool properties and deprecate the existing nasal bitmaps.
Sim: {Colin} Add several MP bool properties
Sim: {Colin} Add MP bool properties for engine state, vapour trails, loadout.
Sim: {Colin} Deprecate the existing nasal bitmaps and inefficient bool-as-int properties.
Model: {Colin} Fix drop tank select animation condition
Sim: {Colin} Use MP bool property for wing/canopy damage
Sim: {Colin} Use bool MP property for explosion
Sim: {Colin} Use short MP properties for ammo count
Sim: {Colin} Add back some animation conditions I forgot
Sim: {Colin} Remove old hidden MP property
Effect: Fixed lightmap in fuselage shader.
Arms: Fix for possible bug.
GUI: Removed print statement.
Effect: Added comments to frag file.
Arms: Another fix to prevent nill error.
Arms: Missile code now supports ejecting bombs with a speed.
Arms: fix for last commit.
Arms: Clusterbombs explosion more aligned to ground.
Arms: Fixed print bug.
Arms: RB99 and RB71 no longer auto-lofts. Also the guidance law updated plus drag also for RB74.
Arms: Missiles can now be set to guide while dropping.
Arms: RB99 and RB71 now guide while drop and is ejected by force.
Arms: RB99 can now guide at lower speeds.
Arms: Fixed serious bug in search code.
Arms: Added support for Attack Steering Cue.
Arms: Fixed seeker head position was opposite reported to HUD.
Arms: Fixed bug in DLZ.
Arms: Fixed if cycling fast through weapons one that was stopped could remain active.
Effect: Set noshadow flag on lights in preparation for compositor.
Sim: Better startup conditions for 2019.2.0, not perfect, but better.
Arms: Fix for missile seeker head.
Arms: RB99 now gets ejected with 20 fps instead of 10.
Arms: Fixed major multi-threading error that made missiles think they lost sight of target when they didn't. This resulted in tons of 'hit the ground' instead of splashes.
Arms: Ejected powered-missiles no align more to aircraft attitude instead of airstream.
Arms: Missiles will no longer lose attitude due to gravity before they have reached minimum guide speed.
TI: Fixed console error when saving plan with speed restrictions. It was harmless, but now its gone.
Arms: {Colin} Register gun/rocket hits without radar lock
Register gun/rocket hits without radar lock
Arms: {Thorsten} Added crater effect when bombs hit ground
Arms: Set flag to enable craters.
HUD: Replaced CCIP with more adv. algorithm.
Arms: M71 now can be fired without lock.
Arms: M71 will now hit anything nearby, not just what was locked when released.
Arms: Fix for hitting nil terrain with bomb.
Model: {Colin} Fix pedals movement direction
Radar: Fix for unneeded console output.
Effect: Fix for dithering in FG next.
Arms: {Colin} Fix M70 rockets trigger logic

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Re: Saab 37 Viggen

Postby Octal450 » Sun Jun 07, 2020 3:21 pm

Hello friends!

Today I announce that the new flight control system and autopilot I have been working on since February 2019 (over 1 year!)

Featuring
- Each surface of the control system is individually simulated with proper roll/pitch mixing. If one fails for whatever reason, the control effectiveness will be felt
- STICK dampers smooth the response of the system
- Gearing changes the deflection of surface vs stick
- Everything simulated according to manuals provided and informations
- ATT and ALT autopilots modes simulated as per manuals
- Autothrottle including AoA and KMH modes simulated
- and more!

Now the Viggen flies much more realistically. Please enjoy!

And of course thanks to Nikolai V Chr and Colin for providing documentation and testing, and finding bugs.

Kind Regards,
Josh
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Re: Saab 37 Viggen

Postby Lydiot » Mon Jun 08, 2020 2:08 pm

Where is the update available for download Octal?
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Re: Saab 37 Viggen

Postby Octal450 » Mon Jun 08, 2020 4:56 pm

Hi, usual place:
https://github.com/NikolaiVChr/flightge ... -37-viggen

In FGAddon next time Necolatis puts it there.

Kind Regards,
Josh
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Re: Saab 37 Viggen

Postby Lydiot » Mon Jun 08, 2020 5:15 pm

thx
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Re: Saab 37 Viggen

Postby Octal450 » Tue Jun 09, 2020 12:00 am

Np

Kind Regards,
Josh
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Re: Saab 37 Viggen

Postby colin_geniet » Wed Sep 09, 2020 7:12 am

Version 4.318 of the Viggen was just pushed to FGAddon.

The main change is of course the FCS and autopilot rework by Octal450, announced in the previous posts.
Octal450 wrote in Sun Jun 07, 2020 3:21 pm:Featuring
- Each surface of the control system is individually simulated with proper roll/pitch mixing. If one fails for whatever reason, the control effectiveness will be felt
- STICK dampers smooth the response of the system
- Gearing changes the deflection of surface vs stick
- Everything simulated according to manuals provided and informations
- ATT and ALT autopilots modes simulated as per manuals
- Autothrottle including AoA and KMH modes simulated
- and more!


Other changes:
Sim: Remove 'userarchive' attributes (aircraft-data used instead)
Arms: Fix gun/rocket hit detection
Arms: Port in missile changes done in S-300.
Model: Fix rotation axes for flaps
Model: Improve formation lights material
Model: Fix vapour animations over MP
Sim: Add GCI script
Sim: Added a method to convert a vector to geo centered vector.
Radar: Now checks if contact is behind horizon.
Effect: Use spotlights for land/taxi light.
Radar: Fixed potential failure in radar.
Sim: Fix that some matrices were multiplied in wrong order.
Arms: Experimental update to account for AoA and sideslip of missile target in proportional navigation.
HUD: Better positioning of nearby objects.
Radar: Fix for not putting new methods into all Contact classes.
HUD: Adding gunsight.
Model: Remove internal gunpod model on AJ(S)
Model: Fix AJ(S) waypoint indicator lockup
Model: {Spectre} Added mig aggressor livery.
Sim: Revise throttle control logic, add throttle cutoff position
GUI: Update and improve checklists
Keybindings: Remove pylon selection keys
Keybindings: Change ejection key to Ctrl-E x3
Keybindings: Change GCI keys to F5-F7
GUI: Made cursor properties more generic to be used in other aircraft as well.
Arms: Remove all weapons from center pylon
Model: Fix bugs in M70 jettison animation
Sim: Deselect radar target when losing lock
Sim: Enable doppler simulation for JA radar
Model: Fix M90 strip color
Sim: Fix AJS external tank capacity
GUI: New loadout/fuel selection dialog
GUI: New configuration menu
TI: Fix EOMR (AAA) being marked as non-functional in the swedish TI
Aero: Slight tuning of Cm zero.
Arms: Implement remote control guidance for Rb05
Arms: Add spotting flare model to Rb05
Arms: Adjust Rb05 performances
GUI/Arms: Disable refuel/reload during ground roll with damage on
Effects: Cleanup redundant shaders (identical to FG default ones)
Sim: {Pinto} Fix bug in turn radius calc.
Sim: Turn radius account for zero turnrate.
HUD: Fix low altitude scale being hidden after turning master arm off
Radar: Fix for 'radar_logic.complete_list' missing some radar contacts
Radar: Improve target air/ground classification logic
RWR: Add radar lock warnings
Radar: Disable radar when nose landing gear is compressed
Radar: Fix bug in RCS code, causing targets to shortly appear at max range
Radar: Increase RCS test frequency for selected track
Arms: Fix for rare case when tracking seeker movement, and skip a guiding pass, then it should not compare since la
st pass.
Keybindings: Add Shift-F to deselect radar target
Sim: Disable external views when damage is on
Arms: Always use bore-sight mode for IR seeker on AJS
Sound: Fix some missing missile launch sounds
Radar: Some work on the radar prototype.
Radar: Fixed check for behind earth curvature sqrt could not handle a negative number with very low magnitude.
RWR: Rework AJS RWR lights
RWR: Add sounds (off by default, controlled by the volume knob on the RWR panel)
Radar: {J Maverick 16} Update RCS database
Input: Fix left/right arrow keys being non-repeatable
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