canard vortices

[the_soupdragon]

Sorry if this has been asked before but why does the DCS Viggen have almost permenant vortices coming off the canards? Is this normal or some sort of bug?

In nearly all of the videos I have watched these vortices are not there all the time they appear only very rarely.

Is this a DCS engine issue?

 

Loving this module though. I have always had a soft spot for the Swedish Jets very unique and this module doesn't dissapoint.

 

Cheers

SD

Edited January 31, 2017 by the_soupdragon
Speeling

[QuiGon]

Sorry if this has been asked before but why does the DCS Viggen have almost permenant vortices coming off the canards? Is this normal or some sort of bug?

In nearly all of the videos I have watched these vortices are not there all the time they appear only very rarely.

Is this a DCS engine issue?

 

Loving this module though. I have always had a soft spot for the Swedish Jets very unique and this module doesn't dissapoint.

 

Cheers

SD

 

They are indeed a bit overdone. It will be corrected in the coming updates.

[the_soupdragon]

Cool. Thanks QuiGon

 

SD

[Skulleader]

Thanks for this question, it's maybe a little detail but not really real.

I look forward the next patch for the Viggen +1

Skull.

[amalahama]

Yes it's annoying actually, I really hope they snap that one quickly. It also happens that wings never have wingtip vortex trails, whatever the AoA is, it seems the current engine can only handle vortex trails in either place, but not both simultaneously.

 

Regards

[Dirty Rotten Flieger]

I suspect that the vortices are always there but in DCS they are visible all the time.

 

The problem is not that they shouldn't be there all the time, but rather that they shouldn't be visible all the time .

 

Looking closely at the canards you can see they are quite a few AoA higher than main wing...

 

I agree it will look better when they are only visible when pulling G or high AOA.

[Boris]

Does DCS even calculate vortices other than visually?

[Reflected]

It's a general DCS problem, I've seen it on other planes too. I took this screenshot online. There surely shouldn't be a trail when taxiing?

 

[26-J39]

I believe the canard vortices are placeholders at the moment.. physics for the vortices are currently based off data from the main delta wing... This was mentioned by Cobra in the twitch with Greywolf..

[nachomaga]

Sorry if that been covered before. Until next Viggen update, I prefer to remove all the vortices in the game. I only test with Viggen, not sure about the other planes, but should work.

 

There is two textures in the game:

 

DCS World/Bazar/Effects/ParticleSystem2

wingtipContrail.bmp

wingtipContrail2.bmp

 

If you fill the two .bmp with black with an image editor (Pixlr, for example), the texture become invisible.

 

Allways backup your files in case you miss your vortices.

[Schwarzfeld]

Wild guess but, I'd imagine this is an ED-level issue that LNS is probably in the process of working the kinks out of; bear in mind that that in almost any flight condition aside from high speed cruise in level flight, the Viggen's canards are always at an AOA of >1º no matter how you fly it, and the slower you get, the harder canard flaps will drop down to assist in generating lift to keep the nose up - same as the M2k's auto slats system, though the M2k as you'll note simply begins to 'surf' at a deeper and deeper AOA as it slows, because it has no canards.

 

The Viggen's canards then are plowing the air at some kind of positive AOA no matter what you're doing most of the time, and (I think) its the first subsonic/transonic/supersonic airframe to be modeled in DCS that also includes Canards, so the ED effects model is likely treating those canards like a main wing that is plowing through the air at a fairly steep AOA/is generating vorticies (according to the effects system) due to the canard flap angle, and subsequently is waaaay over-doing the visuals for the contrails.

 

Likely this is something LNS will have to manually work around because its not something ED likely ever considered as an issue when designing their physics and effects models, as bear in mind as well the ED physics engine originally was purely a subsonic physics system for conventional stuff like the A-10 etc, and the effects engine has never had to cope with a canard delta before either.

[RaXha]

and the slower you get, the harder canard flaps will drop down to assist in generating lift to keep the nose up

 

I was under the impression that the Viggens canard flaps only moves when lowering the landing gear and that they are fixed in all other aspects of flight.

[Schwarzfeld]

You may be right, it just sounds intuitive that the flight computer would adjust those as necessary as speed decreases, but regardless the AOA on the canards as they plow the air (as speed decreases) seems like a logical explanation... I could be wrong on how they operate as speed decreases, it just made sense to me that without slats, they would handle that job pretty effectively.

[Corrigan]

how they operate as speed decreases

 

They don't. The ground crew can set them to -4 deg or -7 deg depending on loadout but they are fixed to that position except when deploying the gear.

[Schwarzfeld]

That makes sense, basically like hard-setting your flaps on a normal acft