Neutral stick rudder roll-reversal

[Quid]

Hello, all!

 

I think I may have found a bug. I've just updated to the latest version of DCS World OpenBeta and have performed a number of free-flights in the Tomcat. Having noted the intent to reduce the rudder effectiveness at high AoA, I went ahead and began testing the roll rate for the rudders. As a control, I went ahead and tested the rudders with stick neutral, and input rudder only roll. To my surprise, the aircraft started rolling in the correct direction for barely a second, followed by a sudden reversal and roll in the incorrect direction (left rudder induced right roll and vice-versa). I tested with more rudder input from the get-go and the aircraft immediately began rolling hard in the wrong direction. I began pulling aft-stick and inputting rudder. With just barely any aft stick, the aircraft rolls in the correct direction. At high stick deflections, the aircraft rolls in the correct direction as well.

 

As I understand it, the F-14 doesn't suffer from rudder-induced roll-reversal, but rather stick-induced above a certain AoA (15 units? going off memory here). It is also strange that at neutral stick it happens, but the instant I use even the most minor back stick, it shapes up. A few people I fly with have noticed the same strange behavior. I have tried restarting the game, and have checked my controls/axis tuning/etc. and nothing is out of place, and it still happens.

 

Is the rudder-induced roll-reversal by design, or is it a bug? Wanted to report if the latter.

 

Still enjoying the hell out of this module, keep up the good work!

 

V/R,

Quid

[PheralCat]

+1

[FoxTwo]

At what velocity?

 

 

She's always done a roll reversal above 250-300kts. At least in prior versions of the open beta.

[SilentGun]

I have noticed this as well. @FoxTwo try kicking the right or left rudder all the way for about 15 seconds without touching any other controls and you will see what Quid is talking about. The type of roll reversal you will experience is unnatural for any air frame to just suddenly snap in the opposite direction.

[IronMike]

I will check, so far I did not notice anything out of the ordinary, thank you for reporting it.

[FoxTwo]

I've just tested it in free flight and it's behaving the same way that it has always done in my experience.

 

 

At high altitude (14k+) and any speed (tested at 300 kts and above mach 1), rudder application rolls you in the applied direction.

 

 

 

At low altitude (on the deck) and speed above 300 kts, rudder application will roll you in the opposite direction. Below 300 kts it's in the applied direction.

[DD_Fenrir]

Did the OP switch off the Roll Stability Augmentation prior to trying this test?

[Quid]

Did the OP switch off the Roll Stability Augmentation prior to trying this test?

 

Hello,

 

I tested with roll SAS on and roll SAS off, both with the same result. Will post a video in a moment.

[Quid]

I made a video which shows what I'm talking about. For whatever reason I'm having problems with the render resolution (doesn't seem to want to render to full screen regardless of what settings I use), so you'll have to maximize the screen to see the control inputs.

 

https://youtu.be/EmzmsNLqNV4

[vadupleix]

I experienced this as well, the snap roll is so violent that I blacked out just like in the video (and crashed)

 

If this is not a bug I’d be very interested to know the physics behind this.

[IronMike]

Thank you for the video Quid, we will get back to you.