SinusoidDelta

There was/is an issue with ATT/ALT Hold suddenly disengaging at higher altitudes. I think that's what OP is referring to as being fixed.

Here is some info on the pulser brake system

With regards to flight testing I've seen this called a rolling pull out. Here's an ancient WWII document which mentions it. https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930092856.pdf A lot of the results on google are paywalled. There may be some documents available on DTIC. I haven't checked.

I can confirm this as well. It may have been the same flight :doh:

I agree. The eagle is equipped with anti-skid and a pulser brake system. Between those two systems I don't think the skidding behavior is accurate.

It looks like some changes were made to the FBW system: https://forums.eagle.ru/showpost.php?p=2941506&postcount=38

FWIW here are some papers I've found pertaining to the Su-27: Generation Of Su-27 Fighter USE OF AEROELASTICITY; MULTIDISCIPLINARY INVESTIGATIONS The “Use of Elasticity” Concept and Flight Safety in View of Advanced Airplane Designs

I hate to stir the pot here, however, that is in no way relevant to the Su-27. If you find information that pertains specifically to the Su-27 or one of its variants feel free to post it.

Has anyone found any technical specifications for this? A quick google search didn't yield much. I want to be optimistic on this but Microsofts previous forays into hardware haven't exactly gone well.

The view in your picture looks very zoomed out. The eye point looks shifted back as well. Zoom in and the HUD should look normal. I think numpad-enter is snap to default zoom.

I still argue it's the pilot's responsibility to react to the alarming onset of Nz. All it takes is some forward stick pressure to survive.

Tritto...if that's a word.

That seems to be the consensus. Windows 8+ is now listed for the minimum hardware requirement. I don't know if it's dx12 related. It's pretty frustrating. First I'm forced to upgrade my GFX card after being lied to that the GTX970 is 'VR Ready'. Now I'm forced to upgrade to Win10 just to get ASW which is supposed to help the first problem. Pretty idiotic.

The log file is in AppData/Local/Oculus/Service_<date>.txt file, search for "ASW". Does anyone know if ASW is only supported for windows 8? I'm getting the following error with Windows 7 64 bit:

I didn't realize ASW could be enabled already! Going to try this right now.

Re-read my post. This data isn't from your track or even an su-27 for that matter. It was an example of telemetry export from the F-15. That feature longer works though and never existed for the flanker. That sounds correct. For normal, velocity vector above the horizon flight, gravity is in opposition to the load factor and radial G is decreased. So, turn rate is lower and turn radius is larger. For inverted flight it's the opposite. Gravity assists the load factor, radial G increases, turn rate increases and turn radius decreases.

The tacview telemetry for this .trk reports [G] as being less than half of whats indicated in game. Tacview's telemetry sample rate is .25 seconds, it could be missing the peak values, but I've seen the same inaccuracies in other Su-27 .acmi's. Do you mean the time code when using LoGet() functions jitters around? As long as you know the time at which the point was taken I don't see why you couldn't compare data. Even without time codes a curve could be estimated by linear approximation. The problem for me is I don't understand how to write such script :( I can process and analyze exported data but I suppose thats the easy part. There hasn't been much discussion recently on the russian side of the forum. When the eagle and flanker PFM's were released there were some very good threads analyzing their performance through exported flight data. Until a few moths ago, exporting the F-15 data was accessible through mods/aircraft/FC3/F15/FM/config.lug, changing line 98 to record_enable=true, and simply pressing rshift+C in game to start logging telemetry to a .csv. (See the image below for an example I plotted for the F-15) For whatever reason, that export method is no longer working for the eagle. The flanker FM was created by another developer and never have that export method so I'm curious how you would go about exporting it.

It's a shame tacview doesn't accurately export the flight telemetry. I still don't know enough about lua scripting to create any kind of export. It'd be a really useful tool to have. FWIW I was able to re-save the track you posted in ME with external views enabled. See the video of it below. The replay was running at 1/2 speed. It doesn't seem to reveal much other than Betty sounds downright hilarious in slow motion. Both wings rip off simultaneously at exactly 8.5G, bank angle is nearly perfectly inverted at 179deg. The jet is definitely armed to the teeth with missiles though. Because the Su-27 FCS simulates the feel of a traditional statically stable aircraft, it's up to the pilot to monitor Nz. The max pitch rate inverted will always be higher than with the velocity vector above the horizon. So it's critical to apply some G limiting forward stick, especially if the G keeps rising with neutral controls. Edit: I watched it a few more times and there is definitely rolling G when aft stick is applied. It doesn't really look like coordinated flight with the nose slipping around, not sure if that's actually the case though. I don't want to beat a dead horse here, whatever you're trying to say about load factor and gravity is just wrong. I don't know what else to tell you. https://en.wikipedia.org/wiki/Load_factor_(aeronautics) https://en.wikipedia.org/wiki/Apparent_weight

Think of the load factor as the apparent weight. That is to say, the force exerted by whatever the body is resting on. When flying the force is being exerted on the 'wet' surfaces of the aircraft immersed in a fluid (air). Some of the other theories and terms you mentioned are only indirectly related. Load factor is a broadly used concept/tool in, for example, structural and electrical engineering. Nz=L/W Nz= Lift Force [N] / Weight [N] Weight is always *1 [G] and as you can see, the units cancel through division. Sorry if I'm pulling the thread a bit off topic :D

The airframe load factor [Nz] is with respect to the airframe.It doesn't change when inverted. It isn't the same as acceleration due to gravity [G]. [Nz] is the ratio of lift/weight, which in the academic sense makes it unitless. It's commonly expressed as [G] because it is the acceleration 'felt' by the aircraft or someone in the aircraft.

You may be misunderstanding what a load cell is. A load cell is an electrical transducer to measure force, commonly with a strain gauge bridge. This is applicable to modern fighters in the form of a stick force sensor, a part of a redundant control system. As the name implies, an SFS measures the force applied to the control stick and transmits the electrical signals to the flight control system. Generally speaking, a closed loop feedback system verifies aircraft response is correct in comparison to an applied stick force input.

Actually the F-15 had a development requirement for operation in a 30kts crosswind. And according to the -1, landing the F-15 is possible with a 30kts 90° crosswind component. Landing with a crosswind component exceeding 30kts is not recommended but it certainly doesn't say impossible. Back to the DCS eagle, have you attempted a T/O or landing with a crosswind of 30kts? I haven't but the results should be interesting based on how severely it reacts to a 7kts crosswind.

FWIW here is some more documentation on control loading :) More on the direct-drive FFB system above: http://www.engineeringmatters.com/EngineeringMatters_Project_FFB.pdf Moog electrodyraulic valve info: http://www.moog.com/literature/ICD/Valves-Introduction.pdf CKD Direct drive actuators: http://www.ckd.co.jp/english/newproduct/pdfcat/CB032A.pdf Kollmorgen direct drive motors: http://www.kollmorgen.com/en-us/products/motors/direct-drive/direct-drive-linear/_literature/ddl_selection_guide_en-us_revb_pdf/ http://www.kollmorgen.com/en-us/products/motors/direct-drive/housed-d-and-dh/_literature/housed-ddr-motor-selection-guide_en-us_reva/ Development of a FFB control system for a 737 simulator: http://www.publishresearch.com/download/185

It's in their labeled as "Show Controls Indicator" I believe.

Thanks for sharing. Definitely good information for mechanical control systems. Most of that doesn't apply to hydro-mechanical and especially FBW controls found in the teen series fighters. This document has a good explanation of reversible vs. irreversible flight control systems. I think a good starting point would be, how realistic in comparison to which aircraft?