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Posted

Hey guys,

becoming more and more familiar with the Viggen shows me what awesome plane it is.

Also I really enjoy to fly something without that typical "west style"...

But I'm still not sure about that QFE thing regarding weapons.

Most time I'm playing MP, so I have to set up a flightplan through the F10 map, load it into th CK37 and have to change the target waypoint from B to M via the control panel.

 

So, of course I have no idea about the QFE on the target waypoint, or the Bx8 waypoint.

BUT: Do I need that? Especially when attacking targets on hills or elevated platforms, this question comes up...

 

Could you help me going trough the weapons and clarify which one needs what?

 

RB-04E: Radar guided anti ship missile - no QFE needed

I think the QFE is obsolete, isn't it? Target area is selected via radar before firing and the flight height is done by the missile on its own radar(?).

 

RB-15F: Radar guided anti ship missile - no QFE needed

I think the QFE is obsolete, isn't it? Target area is selected via radar before firing and the flight height is done by the missile on its own radar(?).

RB-05A: Remote controlled missile - no QFE needed

Purely remote controlled, I can't imagine that QFE would there be needed...

 

RB-75: TV controlled missile - no QFE needed

Purely TV controlled, I can't imagine that QFE would there be needed...

 

RB-24J/74: Air-Air IR missle - no QFE needed

 

AKAN 30/55: Gun - no QFE needed

For the use of the gun, the Viggen is meassureing the distance to the (ground) target with the radar. So there should also no QFE needed.

ARAK M/70B rockets short release: Rockets - no QFE needed

For the use of the rockets, the Viggen is meassureing the distance to the (ground) target with the radar. So there should also no QFE needed.+

 

ARAK M/70B rockets long range release: ?

Sorry, I have no idea what that mode is.

 

BK-90 Mjolnir cluster munition dispenser - Not sure?

I still have not understood how this thing works...

Is it guided or unguided? Do I need to fly exactley at the target or can I also fly a few degerees off?

How is the height calculated / held? When does it know to dispense? Through the radar fix before?

Is it more like a sailplane or a guided missile?

Also I can manage to get it working in SP, but had not one succesfull attemp in MP. Maybe because of elevated targets?

 

Bombs:

attachment.php?attachmentid=202780&d=1548138116

Sorry, I've managed yet only the PLAN - NAV - CCIP variation and it worked not that bad, but is there QFE needed? Or for any other modes?

 

And at least, the most important question to me:

Why is QFE so important and why just not use the radar altimeter?

I undertand the purpose of a barometric altimeter and, of course, especially the correct set up QFE, but when it comes to that close low level flying or (possible also) weapon releases, won't the radar be more accurate?

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Posted

As far as I understand the viggen, the qfe is not necessary for the weapon itself but the hud with the exception of the bk90. Best example is low level high drag bombing. If you set qfe 100m agl, fly at 30m though the pipper will likely disappear cause you are underground for the ck37.

 

Specifically for the bk90:

It is a glide dispenser able to maneuver. No propulsion though. There for you can be off course a bit at the cost of reducing the range hampering the standoff capability. Not suggested.

 

Don't have the documentation at hand but I am pretty confident what I said is right

 

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Posted

Using the radar altimeter for weapons solution would assume the terrain is completely flat. For example: if attacking in a 10 deg dive and you overfly a 50m hill your weapons will hit 10m off. Being honest, I am not entirely sure having to set the QFE in DCS:Viggen was a good design-choice instead of doing the usual way of faking it. If you set Easy Avionics on you don’t need to set QFE.

 

Also, ARAK long range is Viggens version of CCIP-sight ie it shows where the rocket will hit if you fire right now. Can’t be used together with radar ranging (rather, you can try to see what happens) so needs correct QFE.

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Posted

Also, ARAK long range is Viggens version of CCIP-sight ie it shows where the rocket will hit if you fire right now. Can’t be used together with radar ranging (rather, you can try to see what happens) so needs correct QFE.

 

This information is liquid gold.

:thumbup:

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Posted
Using the radar altimeter for weapons solution would assume the terrain is completely flat. For example: if attacking in a 10 deg dive and you overfly a 50m hill your weapons will hit 10m off. Being honest, I am not entirely sure having to set the QFE in DCS:Viggen was a good design-choice instead of doing the usual way of faking it. If you set Easy Avionics on you don’t need to set QFE.

I would not say that. DCS is a simulator, and so every good, and also bad habit of a aircraft should be modeled. If we want it easier, we could go to Ace Combat xD.

 

Also, ARAK long range is Viggens version of CCIP-sight ie it shows where the rocket will hit if you fire right now. Can’t be used together with radar ranging (rather, you can try to see what happens) so needs correct QFE.

 

Sorry if I'm retarted myself, but just to be sure:

 

ARAK short range is used if I pop up and fly to the target in a high angle. With my front facing radar, the distance to the target will be meassured and so I get the release cue (blinking). For the right distance to fire the rockets that they will hit at the dot. QFE setting or altitude select switch is unnecessary.

 

ARAK long range means to turn of the radar distance meassurement and it calculates (the dot?) the impact of the rockets just by my height (QFE or radar altimeter? Or does it depends on the altitude source selector switch?) and angle I'm flying.

 

Is this right?

 

 

So coming back to bombs / MK90 - Those two needs the correct QFE setting?

How to get that when flying on a MP server?

 

Regarding bombs and my posted oversight of the bomb modes:

Is it correct that modes with "ANF" use the forward radar for release, and because of that the QFE is not important?

Vise versa, if useing modes in "NAV", does the altitude source selector switch makes a difference (use radar, QFE) or will always QFE be used?

 

Thx a lot!

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Posted (edited)
viper2097 said:

How to get that (QFE) when flying on a MP server?

 

Hi,

 

I know this is a bit longish video, but xxJohnxx shows a (relatively) simple way to determine QFE when on a MP environment:

 

 

 

🙂

Edited by Rudel_chw

 

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Posted

ARAK long only uses barometric altitude.

 

Level- and precision bombing modes uses radar measurement so QFE is less important.

DCS AJS37 HACKERMAN

 

There will always be bugs. If everything is a priority nothing is.

Posted

Wow, thanks for that video, really helpful!

Have seen it before, but not clicked on it cause I thought it is only teaching what QFE is generally.

 

RagnarDa,

So could you confirm that the following list is correct?:

Still not sure about the BK-90

 

No correct QFE needed:

RB-04E: Radar guided anti ship missile (only stay within correct release height)

RB-15F: Radar guided anti ship missile (only stay within correct release height)

RB-05A: Remote controlled missile

RB-75: TV controlled missile

RB-24J/74: Air-Air IR missle

AKAN 30/55: Gun

ARAK M/70B rockets short release

Bomb modes: All in Mastermode ANF

 

Correct set up QFE needed:

ARAK M/70B rockets long range release

BK-90 Mjolnir cluster munition dispenser

Bomb modes: All in mastermode NAV

 

 

Sorry for two more questions:

For the modes which need the correct QFE, can I use the RHM instead of QFE by just switching the HÖJD CISI switch? Or will always the QFE been used?

Is it possible to switch betwen the backup and normal altimeter or will always th emain altimeter be used for weapon release?

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Posted
Wow, thanks for that video, really helpful!

Have seen it before, but not clicked on it cause I thought it is only teaching what QFE is generally.

 

RagnarDa,

So could you confirm that the following list is correct?:

Still not sure about the BK-90

 

No correct QFE needed:

RB-04E: Radar guided anti ship missile (only stay within correct release height)

RB-15F: Radar guided anti ship missile (only stay within correct release height)

RB-05A: Remote controlled missile

RB-75: TV controlled missile

RB-24J/74: Air-Air IR missle

AKAN 30/55: Gun

ARAK M/70B rockets short release

Bomb modes: All in Mastermode ANF

 

Correct set up QFE needed:

ARAK M/70B rockets long range release

BK-90 Mjolnir cluster munition dispenser

Bomb modes: All in mastermode NAV

 

It's not really on/off - as practically all weapons rely on QFE more or less no matter whether radar ranging is used or not. So having correct QFE always makes your weapon delivery more accurate no matter what.

 

There's more info in the manual and in the video there was a list of broad categories how much each weapon relies on QFE.

 

Sorry for two more questions:

For the modes which need the correct QFE, can I use the RHM instead of QFE by just switching the HÖJD CISI switch? Or will always the QFE been used?

 

Nope - only switches it for the HUD.

 

Is it possible to switch betwen the backup and normal altimeter or will always th emain altimeter be used for weapon release?

 

Main altimeter is always used for the weapon release.

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Posted
It's not really on/off - as practically all weapons rely on QFE more or less no matter whether radar ranging is used or not. So having correct QFE always makes your weapon delivery more accurate no matter what.

Indeed! Even weapons that use radar ranging only use that in the final phase of the attack run to compute a firing solution, but in the first phase of the attack run they also rely on QFE to give steering guidance to the pilot.

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Posted

There's a pretty good way to tell if your weapon needs QFE or not.

 

Smart weapon: it doesn't (BK-90, AGM-65)

 

Otherwise: is there a "fin" appearing above the aiming dot on the HUD?

 

Yes -> No need for QFE

No -> You need QFE

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