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+--- Thread: .cfg and FSPax disagree on Vfe speed (/showthread.php?tid=9363)
.cfg and FSPax disagree on Vfe speed - AKA - 14-05-2015
I read the sticky, I just want to to start with that lol.
The problems discussed in the other posts are about changing the flap speed to avoid penalty.
The problem Im having is slightly different.
The Fspax screen right before the flight starts lists my aircraft's VFE speed as 190. This is incorrect according to the AOM for the aircraft, it
should be 200 for flaps 9 in this plane.
I selected the help button and it said that FSPax gets the Vfe speed from the config file in fllaps.xxx on the blowout line.
So, I opened up the .cfg for the aircraft, and when I got down to flaps it did NOT say 190, as FSPax is reporting, it in fact says 210, which is
actually 10 knots higher than what the flap extension speed it is supposed to be according the AOM and PMDG (the software developer), I
assume for some margin of error?
Here's is a Cut and paste of the appropriate section of the .cfg. Can someone please tell me what I'm missing? How can I get FSPax to
put my Vfe at 200?
[flaps.0] // Main section all
type = 1
span-outboard = 0.65
extending-time = 8.333
lift_scalar = 1.00
drag_scalar = 1.00
pitch_scalar = 1.00
damaging-speed = 205
blowout-speed = 210
flaps-position.0 = 0, 250
flaps-position.1 = 9, 200
flaps-position.2 = 15, 160
flaps-position.3 = 25, 140
[flaps.1] // Correct LIFT 0-15
type = 1
span-outboard = 0.65
extending-time = 8.333
lift_scalar = 1.0
drag_scalar = 0.00
pitch_scalar = 0.00
damaging-speed = 205
blowout-speed = 210
flaps-position.0 = 0.0
flaps-position.1 = 7.927
flaps-position.2 = 2.703
flaps-position.3 = 0.000
[flaps.2] // Correct DRAG 25
type = 1
span-outboard = 0.65
extending-time = 8.333
lift_scalar = 0.0
drag_scalar = 1.00
pitch_scalar = 0.00
damaging-speed = 205
blowout-speed = 210
flaps-position.0 = 0.0
flaps-position.1 = 2.0
flaps-position.2 = 0.0
flaps-position.3 = 6.0
Re: .cfg and FSPax disagree on Vfe speed - AKA - 15-05-2015
ho help??
Re: .cfg and FSPax disagree on Vfe speed - Joeflyer - 15-05-2015
Just what particular problem are you having? I have all PMDG aircraft and have never run into a penalty for exceeding flap limits, as I never do. So,
tell me exactly where the problem is other than you not agreeing with with what the .cfg should have. Please don't take this as an insult. I am trying
to understand the "problem"
Edit: I just got home and have taken a look at which .cfg you are referring to. Obviously it's the J41. I have used this aircraft on many a FsP flight and have NEVER had a problem with FsP causing any issues with exceeding the flap limits at any stage. You may be over thinking this whole process, or you are actually employing flaps at too high of speeds. Tell me, which is the case?
Post Edited ( 05-16-15 03:20 )
Re: .cfg and FSPax disagree on Vfe speed - AKA - 16-05-2015
Ok thanks for the response!
The AOM for the J41 says quite clearly that the flap extension speed for "flaps 9" is 200 knots. But FSPassengers on the preflight screen (the
one right before you click start flight) is showing that Vfe for the aircraft is 190, this isn't correct. I clicked on the help dialog, and found that
FSPax gets those limits from the aircraft.cfg in the flaps section.
However as you can see above, the flaps section does not indicate that 190 is the limit, in fact it seems to put the blowout limit at 210, even
higher than the AOM.
FSPax is punishing me for extending flaps over 190, when 200 should be the limit. <--TL:DR
Re: .cfg and FSPax disagree on Vfe speed - Joeflyer - 16-05-2015
Why in the world are you extending flaps even at 190 on the J41??? I see what you mean in your last sentence. Makes it all too clear....you aren't
flying the J41 as it is intended to be flown.....by the numbers. Have you even looked at the performance charts for this aircraft?
Even if the aircraft .cfg and FsPX numbers don't match, I do not see a reason to consider this to be a support topic. You shouldn't be extending flaps
at limitation anyway...whether it be 200 or 190. First notch of flaps can be safely deployed below 180 without obviously stalling the aircraft. Is
that what you are concerned about?
Re: .cfg and FSPax disagree on Vfe speed - AKA - 16-05-2015
Ok, i mean, I wasn't really trying to get into a aviation arguement. All the materials on the J41 say that the 9 flaps speed is 200. The
tutorial flight provided by PMDG says to extend them as the airplane slows under 200 KIAS. The plaque inside the VC says its 200.
I extend them at between 190 and 200 in order to help the plane slow down during approach.
I guess what I'm really asking then, is how did FSPAX get 190 as the Vfe speed? I don't see that number anywhere in the config. the
line referenced in the help section (where FSPAX gets VFE from) is the "flaps blowout"
![[Image: Vfe2.jpg]](http://s221.photobucket.com/user/lowew79/media/Vfe2.jpg.html)
This is the reported Vfe
![[Image: Vfe1.jpg]](http://s221.photobucket.com/user/lowew79/media/Vfe1.jpg.html)
The circled text says that Vfe is found at the blowout speed in the .cfg. But if you look at the .cfg, the speed at the blowout line is actually
210.
[flaps.0] // Main section all
type = 1
span-outboard = 0.65
extending-time = 8.333
lift_scalar = 1.00
drag_scalar = 1.00
pitch_scalar = 1.00
damaging-speed = 205
blowout-speed = 210
flaps-position.0 = 0, 250
flaps-position.1 = 9, 200
flaps-position.2 = 15, 160
flaps-position.3 = 25, 140
[flaps.1] // Correct LIFT 0-15
type = 1
span-outboard = 0.65
extending-time = 8.333
lift_scalar = 1.0
drag_scalar = 0.00
pitch_scalar = 0.00
damaging-speed = 205
blowout-speed = 210
flaps-position.0 = 0.0
flaps-position.1 = 7.927
flaps-position.2 = 2.703
flaps-position.3 = 0.000
[flaps.2] // Correct DRAG 25
type = 1
span-outboard = 0.65
extending-time = 8.333
lift_scalar = 0.0
drag_scalar = 1.00
pitch_scalar = 0.00
damaging-speed = 205
blowout-speed = 210
flaps-position.0 = 0.0
flaps-position.1 = 2.0
flaps-position.2 = 0.0
flaps-position.3 = 6.0
Setting aside best piloting practices, and whether is prudent or not to actually extend the flaps at that speed, why is FSPax getting the
wrong number according to the .cfg?
Consider it a question about how FSpax works rather than a piloting question if that helps.
Re: .cfg and FSPax disagree on Vfe speed - Joeflyer - 16-05-2015
"Setting aside best piloting practices, and whether is prudent or not to actually extend the flaps at that speed, why is FSPax getting the
wrong number according to the .cfg?"
The .cfg part of the question is for Dan to answer. I certainly don't have the answer for this one. But, why set aside the best piloting practices?
The point of this exercise is to not pick up any bad habits when flying any aircraft....complex or not. Flaps are generally not used to slow an
aircraft down but to increase the rate of descent without increasing airspeed. Spoilers are used for the main purpose of slowing down the aircraft.
For the J41 and any fast complex aircraft, with or without spoilers or speed brakes, planning well ahead for target altitudes and speeds is the entire
point of the conversation I want to have with you.
Re: .cfg and FSPax disagree on Vfe speed - gbapache - 22-05-2015
I used to have a 300 year old pumpkin for an IP who beat me with a broken broom handle to get me to understand "Be in front of the goddamn
helicopter, not behind it, you stupid sack!!!!!" I paraphrase. This is the point Joe is trying to get across.
Re: .cfg and FSPax disagree on Vfe speed - AKA - 22-05-2015
Guys I get it okay, I really do. I promise I do...
Now please understand my question is with how FSPax the program itself works. Why is it getting a number that doesn't exist in the .cfg?
Re: .cfg and FSPax disagree on Vfe speed - Joeflyer - 22-05-2015
Quote:AKA wrote:
Guys I get it okay, I really do. I promise I do...
Now please understand my question is with how FSPax the program itself works. Why is it getting a number that doesn't exist in the .cfg?
Please refer to my post above Apache's response...in particular this point: "The .cfg part of the question is for Dan to answer. I certainly
don't have the answer for this one."
And to be quite frank, 10 knots difference between the 2 numbers for the first notch of flaps is not a big deal at all for this aircraft. If you
don't put in the first notch until 180, it won't fall out of the sky.