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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.

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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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