aircraft.cfg ??

[N99AL]

Some questions about the aircraft.cfg file.

Under [pitot_static] it reads:
vertical_speed_time_constant=1.0

As to the entry =1.0, I have reviewed most of my "fleet" and the number varies from =0.8 to =999
Most planes [I have about 60 in FS2K2] are =1.0 or =10.0.
I have played around with various numbers, however I don't notice much change,if any, when I change the number.

Exactly, just what does this number change.

I have several aircraft that have a problem holding an altitude on AP ALT HOLD. Nose just pitches up and down trying to lock on the altitude. [not all planes]

I have a lot of experience with FS2k2 and I also am a real world pilot. So I understand flight dynamics.

I am just not sure what and how the {pitot_static] is trying to correct.

[N99AL]

Anybody out there got an answer to this ?????????

[Sunny9850]

Hi there,

it basically makes the "feed" from the pitot tube more or less of sensitive in the autopilot behaviour.
Since you are a pilot I don't have to tell you that the pitot is connected to you airspeed indicator.
If the airspeed fluctuates a lot the autopilot will work overtime. If you handfly you won't notice much
unless you really look hard at you're AI.
Of course I could be wrong, it happened before...once ;-)

Happy Landings
Sunny :-cool

[baddadnv]

> Under {pitot_static} it reads:
> vertical_speed_time_constant=1.0
> Exactly, just what does this number change.

Hi Ray,

The Autopilot in 2002 flys (controls) the A/C with inputs of trim, in the various control surfaces. So when the A/P senses the A/C is losing altitude, it begins to apply UP TRIM to compansate.....The line your asking about controls how FAST the A/P adds Trim.....1.0 being default, 1.5= 1 1/2 times as fast, 2.0 being twice as fast.....Just like if you where adding up trim with your keyboard, the faster you repeating-ly pressed the key, the faster the A/C would respond.

For your A/C that are porpoising:

Change your vertical_speed_time_constant=9.0

Change your elevator_trim_effectiveness=1.2

Change your pitch_stability=1.5

You can increase any of the examples above, but do ALL THREE, instead of trying to correct it with one BIG change.

Have Fun,

Randy Burton

[N99AL]

Randy: Thanks. Very helpful. I have fooled around with these numbers before. Mostly guess work. Your input give me better direction . thanks again.

[kc10]

[font size="1" color="#FF0000"]LAST EDITED ON Apr-27-03 AT 02:05AM (EDT)[/font][p]About the elevator_trim_effectiveness; I have found that entry usefull in editing the sensitivity of pitch trim input.The lower the number(ex:like going from 1.0 to 0.75) the more input required,which means smaller adjustments are made possible. But use decimals, not negatives.

[font color=blue size=1]P4 2.4
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[font color=blue size=2]KC
Ft Lauderdale,Florida[/font]

[baddadnv]

Hi KC,

Good Tip for Hand Flying, .........but not AutoPilot.

You could probably get the same desired effect, by editing (Decreasing) the Aircraft cfg. file under: The {KEYBOARD RESPONSE} Section?

Regards,

Randy Burton