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at what moment exactly does radar start warm up?


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Posted
Are you sure ? Not at home so can't check but from memory there is a P in the center of the display.

P comes up only if the engine is at certain RPM

[sIGPIC][/sIGPIC]

Posted (edited)
Viggen uses a special INS system, it uses a technology called ternav to help reduce the INS drift and it require rather frequent updates to stay precise.

 

It's not INS, there's nothing to align before flight: https://forums.eagle.ru/showpost.php?p=2967909&postcount=7

 

It's more like the doppler system in Mi-8 and Gazelle, just automated.

Edited by some1

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Posted
It's not INS, there's nothing to align before flight: https://forums.eagle.ru/showpost.php?p=2967909&postcount=7

 

It's more like the doppler system in Mi-8 and Gazelle, just more automated.

 

I know, I was using simple notions to avoid confusion, but thanks for pointing this out and the linked post explain it very well. :thumbup:

Helljumper - M2000C Guru

 

Helljumper's Youtube

https://www.youtube.com/channel/UCK3rTjezLUxPbWHvJJ3W2fA

Posted
but I need INS in mirage to set marker with HUD for bomb release, right?

.

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Posted
It's not INS, there's nothing to align before flight: https://forums.eagle.ru/showpost.php?p=2967909&postcount=7

 

It's more like the doppler system in Mi-8 and Gazelle, just automated.

 

From what is said in this link, yes, it looks like a doppler radar based navigation system, like what was used on Mirage IIIE or some Mirage F1 versions...

 

But Viggen is older than Mirage 2000.

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Posted

ah sorry, I thought you missed that question! Will test it now! :)

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Posted

Worked flawless, even without waiting for INS (with INS alignment disabled in setting). Bomb hit exactly where the aimpoint said it would (I dropped it at perfect moment)...

DCS Wishlist: 2K11 Krug SA-4 Ganef SAM, VR-TrackIR icons next to player names in score-chart

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Posted

or wait, do I have to "disable gyro drift" too? I didn't do that...

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Posted

which "cheat" ?

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Posted

unchecked ofc, but forgot to enable gyro drift...

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Posted
Worked flawless, even without waiting for INS (with INS alignment disabled in setting). Bomb hit exactly where the aimpoint said it would (I dropped it at perfect moment)...

 

Which attack mode ?

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Posted

the one where I place a green " + " icon on the ground on my HUD and then fly towards it and drop the bomb when the greenbar comes from bottom of HUD and moves up... :P

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Posted (edited)
the one where I place a green " + " icon on the ground on my HUD and then fly towards it and drop the bomb when the greenbar comes from bottom of HUD and moves up... :P

 

In French "CCPL direct" or "direct CCRP", the other one being "CCPL + PI" where you designate an initial point.

 

In "CCPL direct", when you perform target ranging, the system record target position relatively to your aircraft, so navigation drift isn't a factor anymore after target's designation.

That's why you don't really have "blind" bombing mode based only on target's coordinates.

 

You need to get line of sight on on target or Initial Point so during the attack you can bypass navigation system drift.

 

That's Mirage 2000C RDI.

 

On the other hand, and Mirage 2000D, with a far more accurate navigation system, would be able to put dumb bombs on target, hands off in terrain following and 0 visibility.

Edited by jojo

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Posted

It's a good question though. How badly/off/secours does the INS need to be before AG computed bombing degrades or is unavailable entirely?

Posted (edited)
It's a good question though. How badly/off/secours does the INS need to be before AG computed bombing degrades or is unavailable entirely?

 

It doesn't really matters, you don't need target coordinates to attack.

The problem isn't navigation accuracy once you have eyes on target. As long as INS gives you attitude it's Ok.

If INS attitude fails, probably you will have to go "secours".

Think of it like MiG 29 for attack run.

Edited by jojo

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Posted

So realistic or not currently, Helljumper?

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Posted (edited)
So realistic or not currently, Helljumper?

 

For sure, you won't be able to warm up the radar on internal battery !

 

If I understand well the electrical diagram on Mirage 2000C RDM manual:

- radar is on ALT 2 shed bus.

- ALT 2 shed bus is fed by GPU.

 

So what myHelljumper described seems to be correct. :thumbup:

Edited by jojo

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Posted

Radar is almost certainly high power alternating current coming from AC generator or AC external power. Airplane probably makes a tiny bit of AC from converters but that would be reserved for critical and low power systems.

 

Radar preparation cannot happen until AC power on the AC bus which powers the radar is available. This power may come from an external source or from the engine-driven AC generator. The AC generator is usually automatically unattached from the AC bus until the engine is above a certain RPM to prevent undue load on the engine at low speed and to ensure sufficient electrical output.

Posted

Ok I tried with ground power on instantly (before doing auto-startup), but the "P" on the radar display still takes long time until it starts flashing (warming up?). I have it in SIL to warm up, or will it start warm up earlier when I put it to P CH mode first?

DCS Wishlist: 2K11 Krug SA-4 Ganef SAM, VR-TrackIR icons next to player names in score-chart

PvP: 100+ manual player-kills with Stingers on a well known dynamic campaign server - 100+ VTOL FARP landings & 125+ hours AV-8B, F-14 crew, royal dutch airforce F-16C - PvP campaigns since 2013

DCS server-admins: please adhere to a common sense gaming industry policy as most server admins throughout the industry do. (After all there's enough hostility on the internet already which really doesn't help anyone. Thanks.)

Dell Visor VR headset, Ryzen 5 5600 (6C/12T), RTX 4060 - basic DCS-community rule-of-thumb: Don't believe bad things that a PvP pilot claims about another PvP pilot without having analyzed the existing evidence

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