flying.toaster

Yeah it definitely looks like that. As it stands it would surely rate poorly in the Cooper-Harper scale Guess it's looking more and more like some tweaking is needed after all. Let's hope ED has some time for the fix. Just for me to get it, what you mean by lateral dampening is slow onset of roll rate or large stabilising moment (read positive dihedral)? Thanks for the insight

Well it actually dates waaaaayyyy back. The X-15 for instance (first flight 1959) already had an aileron rudder interconnection (named YAR) and a 3-axes stability augmentation system. Stability augmentation has become a must with aircraft for which speed ranged from 100 knots to mach 3 (if only in the form of artificial feel). So yes a form of ARI is expected on the Su-27, and mentionned in the flight manual too (so, yes combatace, I guess it is normal to see the interconnection even in the latest update :smilewink:). What I *really* find annoying is the way the ARI will induce dutch roll, if anything because roll is not kept in check by the FCS even in the latest update. Once again, my bets are on insufficient controller gain at low speed for roll control law (generally in roll rate vs. stick deflection). A simple proportional controller for deflection vs. roll rate (and gain adjusted to IAS), helped by a Ny law for rudder deflection can do a fair business, but it is all the better if eagle dynamics has access to a more accurate description of the FCS As it is, low speed handling is just a pain, and that really feels weird to me because a/ Airliners are actually better behaved with much larger inertia (and that's first hand experience on full flight simulator) b/ I would not like to go on an airshow demo with such a behavior. The wing drop after a stall is just appalling and darn hard to control. Don't even think about hornet walk in that bird... Oh wait .. Low speed low altitude pass is part of any airshow routine :) But then again it's all a matter of taste. A lot of people seem to enjoy the extra challenge. It sure has become an interesting thing to throw around, but I hardly believe the soviet air force flight test center would accept such poor low speed handling in a fighter that reaches operational squadrons. If somebody could find us a MiG-29/Su-27 pilot to give first hand feed back, and I will be more than happy to accept his/her word !

Observed too, I guess it is a replication of an aileron rudder interconnect to counteract adverse yaw at low speed. Problem is it seemed to trigger dutch roll but I guess last updates fixed it. Has anything been done about that or am I dreaming it ?

Err no trolling intended here so please kick me if I go over the top with this question but ... Isn't something a tiny bit odd with the roll control of the PFM ? I mean the real thing has A/ Fly by wire with augmentation in roll according to the flight manual (double checked various translations) B/ LOTS of roll authority, courtesy of a rolling tail + 3/4 span flaperons Yet below 600Km/h indicated it has a serious issue with roll stability... And all those huge control surfaces does not seem to be able to stop the massive inertia of the beast (even lightly fueled and with no stores). I have seen airliners having a crispier roll behavior ... Not having flown the real thing my opinion may be put in doubt (I am OK with that too), but watching the video from Flanker 1.0, you can see that Anatoly Kvotchur does not get especially busy with the stick when making a 45 degrees bank turn. And he nails the bank angle too. Dunno I think I noticed the wild dutch roll tendencies decrease a bit with the last release (but I may be delusional on that one) so I guess tweeking a bit the FCS gains in roll at lower dynamic pressures may help a bit (high speed behavior is, once more, nice enough). Any thoughts on that or first hand experience with FBW fighters is welcome. Don't get me wrong, the FDM is beautifully executed, and it's a very nice touch to have to work the rudder in a turn, but I can't imagine the russians (and their excellent control systems theorists) having a fighter with that kind of low speed behavior, if anything because it can all to easily drag you from stall to spin, or pilot induced oscillations ... Just my two cents :joystick: