View Full Version : Slow Flight Issues. Please help...
05-14-2003, 03:23 PM
I've been building the A340 air file from scratch and yesterday I started testing the plane's performance in slow flight and especially during the approaches. And something really weird surfaced...
Whenever I extend flaps in slow flight, like on approach for example, the plane goes into this really steep dive, which is quite controllable but definitely should not be taking place.
Which records in the air file I should be looking at to fix this? Is this too much lift for flaps [CL_Df]? Or pitch moment / flaps [CM_Df] is too high? Anything else? I seem to be a little lost here.
I will apreciate all opinions.
05-15-2003, 10:14 AM
What are your flaps.n section entries in the aircraft.cfg file?
Pegasus Aviation Design
05-15-2003, 11:40 AM
Well actually i solved it already..
Thx anyway, it had nothing really to do with the flaps cfg setting..
The problem was within the air file Rec. 1539 Fs2k2 Lift Derrivatives, CL_Df was sset a bit too high. Now it much much better :-)
Cheers, Thx anyway.
05-15-2003, 12:25 PM
It sounds like you are using Microsofts FSEdit that comes with FS2002Pro. If so, you might want to delete sections 1539 through 1546 from your *.air file using AirED152 or AAM. Visit http://perso.wanadoo.fr/hsors/FS_Soft/index.html and/or http://www.aircraftmanager.com/ . Download the latest control files, i.e., aired.ini and aam.ini.
It is interesting to note that none of the default fs2002 aircraft have these sections unless they have been modified by FSEdit.
05-15-2003, 12:52 PM
LAST EDITED ON May-15-03 AT 12:55PM (EDT)[p]LAST EDITED ON May-15-03 AT 12:53 PM (EDT)
Well actually sorry, but you are wrong...Please read my reply carefully
I am not deleting anything :-)Because i put those records in the air file and they determine most of my airdynamics charcteristics.
I wrote this air file from scratch using the Flight Model workbok.
I have the FSedit, but i conciously refuse to use it, for the simple reason that it doesnt edit the airplanes but only screws up the air files.
So it would only make sence to delete these records if they were added to the air file by the FSEDIT. These records (##1539 and up)are crucial to the FS2k2 flight model performance!!!
The only problem is that the FSEDIT sets those records and tables extremely poorly. So since i dont use the FSedit and calculate them myself with the help of Gery Backwith from Mudpond I am not gonna delete them, only edit for feel :-)
Anyway, the problem noted above has been solved alredy anyway and thx for your replies.
05-15-2003, 06:34 PM
I am glad you were able to insert your own tables and make them work properly. I didn't know anyone was working on exactly identifying these parameters.
I hope your aircraft is compatible with FS9, FS2004, MSFS-ACOF!
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