Does the aircraft.cfg have to match the air file? Cause I opened the PSS 777-200LR air file and it shows static thrust at 29000lbs or something, and the aircraft.cfg says 110000lbs or something static thrust. What's going on??? Is this supposed to be right?

Does the aircraft.cfg have to match the air file? Cause I opened the PSS 777-200LR air file and it shows static thrust at 29000lbs or something, and the aircraft.cfg says 110000lbs or something static thrust. What's going on??? Is this supposed to be right?

Interesting question.I do not know if they "have" to match but in checking a number of the default FS2004 aircraft I find that they all do match in those aircraft.This is the max rated static thrust at Sea Level in both cases.There seems to be some difference of opinion amongst a few "experts" I have visited with as to which data source (the air file or the aircraft.cfg) takes precedence.Hopefully someone can advise.

i've found the static thrust and the intake diameter/volume number in the .cfg file take priority over the .air file.with that said ... depending on how the flight model was created just changing the numbers to 'real world' values may create unexpected results in FS. FS flight dynamics are a 'black box' ...you need to 'play with the numbers' to find a balance for what you feel are real performance and what FS is able to duplicate.--

Hello,Some documentation and tool will help the sorcerer's apprentice for the air file and aircraft.cfg experiments Flightsim.com :

FS2004 (ACOF) - Misc.FS2004 How To Tweak Flight Dynamics[ Download | View ]Name: howtweak.zip Size: 47,722 Date: 09-12-2005 Downloads: 1,819FS2004 How To Tweak Flight Dynamics. This pdf file is for people who want to learn, or learn more, about updating the flight dynamics of FS2004 aircraft. It won't tell you everything, but it will tell you some things the majority of flight simmers don't know about updating flight dynamics. By Bob Chicilo.

FS2004 (ACOF) - Misc.FS2004/FSX Air Ed[ Download | View ]Name: godaired.zip Size: 217,305 Date: 08-06-2009 Downloads: 1,965FS2004/FSX Air Ed. This is a good copy of AirEd by William M. Roth. The uploader noticed that other versions of this utility are missing things. Like in primary aerodynamics under lift, there should be 8 records, not 6. This upload is for anyone who is trying to tweak the flight dynamics of FS2004 or FSX aircraft and might have been having a problem. Uploaded by Bob Chicilo.

Regards.Gus.

Morning all.This is the way I see it. The functions of the aircraft.cfg and its associated .air file has changed over recent the versions of FS. In pre-FS2000 days, the .air file ruled, and the .cfg file did little beyond tell FS what texture to use. Things changed substantially with FS2002 (FS8) however because most of the parameters that affect the way a plane flies became located in the .cfg file. The core FS engine has remained conceptually the same over the last ten years or so, so that we still have the .cfg and .air files. The changeover was clear to me because if you loaded a FS2000 plane into FS8 then the very bare .cfg file was transformed into a long and complex file with all the headins that we see now. It was actually this discovery that got me interested in flight dynamics in the first place.So, in FS9 and FSX, the two most commonly used MS sims these days, the .air file appears to be loaded first, and the .cfg file after that as ever was, so that its contents overwrite those parameters loaded into the sim by the .air file. There are some parameters that are not included in the .cfg file but they are few in number, so that these still need to be set in the .air file. However for the majority of FDs (outside the specialist, highly-detailed ones) they are not really relevant. As such, for the vast bulk of the properties loaded into the sim, it doesn't really matter what the .air file says because the parameters are overwritten by the .cfg file. In other words, the construction of the .cfg file is the important part. So if you see a FD set that say has different .air files for different engine configurations, then unless the .air file is specifically used to modify parameters like engine temperature (which is one of the parameters that the .cfg file does not address) then it's largely a waste of time. Two examples to illustrate these points: Matthias Lieberecht provided recommendations for two FD variants for his excellent and complex BAe-146/RJ panels, the essential difference being the engine temperature for the RJ which has to be adjusted in the .air file. Also, the FD specialists at Posky have recently indicated that they will focus on the .cfg file rather than modifying the .air file.I've demonstrated this to myself many times over since the launch of FS8, and my normal practice now when constructing a new FD is to use one of the vanilla default .air files - and actually do nothing to it unless there is one of those small specific necessary changes I mentioned. This approach has a wide tolerance since one of my first FDs was for a 727-200 and used the default 737 .air file with no changes. Nothing unusual there - until you remember that a 727 has three engines! All handled through the .cfg file.So for the first Enigma Simulations releases for FS9 for which I have the pleasure to be the FD designer (the first of which is imminent - quick plug there; follow the story at www.enigmasim.com), the whole thing has been designed around the .cfg file using a default .air file, so you'll be able to try it out for yourselves. To answer Nandan's original question: perhaps there's a little confusion here. In demonstration, this is from my 777 .cfg file, uploaded at Avsim recently:[TurbineEngineData]bypass_ratio=8.33fuel_flow_gain= 0.004inlet_area= 89.26rated_N2_rpm= 29920.00static_thrust= 93700.00 //GE90-94B;static_thrust= 90000.00 //RR Trent 890 or PW 4090afterburner_available= 0reverser_available= 1He might be talking about the rated N2 RPM, which as David indicates is pretty standard at a setting of 29920. The static thrust at sea level is however represented by the values in those particular lines (here, variable depending on engines). Whatever the values in the .air file, they are overwritten by what you see above in the .cfg file, as scoob indicated. Also, a thought regarding Nandan's ongoing quest for a PSS/Posky merge which captures the ILS effectively. It may be that this is not a FD problem at all, but is a 'feature' of the PSS autopilot gauges built into the PSS panel. If this is the case, it's possible that no amount of FD tweaking will completely solve the problem.I don't claim this to be definitive, but it has worked faultlessly for me over the last ten years. When the first Engima aircraft is launched (soon!), I look forward to good discussions on the EnigmaSim forums regarding FDs!;)

When FS2000 came out the performance parameters were added to aircraft.cfg. MS provided a program FSEdit.exe. Here is from the FS2000 sdk:The .air file for each aircraft controls how the aircraft flies. You cannot modify the .air filedirectly, but some of the parameters from the .air file are incorporated into each aircraft

Sorry, the static thrust says 26500lbs in air file or something. N2 is 29000 lbs around. Why?Dang, any ideas how to fix ILS?

Nandan,Don't worry about the figure in the .air file, it's the figure in the .cfg that will be used. If it says the same, 26500 or thereabouts, then this can't be right as it's only the thrust of an average 737 which would hardly get a 777 rolling let alone taking off! For a 777 as in my example above, the figures for static thrust are up in the 90000's according to Boeing.Regarding your ILS problem, you've only got a few options as far as I can see:- drop the merge idea and use the PSS model- use the Posky model and use a different panel- continue the merge and do a little internal surgery in the panel.cfg and replace the PSS autopilot with the default 777 autopilot or similar (if possible). Back files up first.Have you confirmed that the flight dynamics that you are using will or won't capture an ILS when you're not using the PSS panel? Try aliasing it to the default 777 panel and see whether it captures OK. If it does, it's likely to be the PSS autopilot that doesn't like being merged with anything else.;)

See the PSS forum for an update.Please note that the PSS a/p has its own logic and can be tweaked just a little bit.

Johan, have you changed some parts in the air file for your FDE update? I see you had made changes to the aircraft.cfg.I'm gonna do testing with POSKY autopilot section from Service Pack D or just original one (the max throttle rate on the Service Pakc D one looks way bigger than the original one-does this affect the ILS since the max throttle rate is higher?) with PSS air file and merge panel.Ill use Johan's aircraft.cfg and air file and his package with POSKY 777. ORJohan's autopilot section in my merge aircraft.cfg using Johan's air file and other thing that comes in package. Hopefully something will work. ORAlso i'll use POSKY autopilot section in my merge aircraft.cfg with Johan's air file and AP_control_coeffs Hopefully it might work. Any suggestions?