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Aileron trim limits

DragonflightDesign

Resource contributor
Messages
760
Country
northernireland
In the SDK section for the aircraft.cfg file there is mention of an elevator_trim_limit parameter but no mention of a rudder_trim_limit or an aileron_trim_limit parameter. Having learned a long time ago not to trust the SDK docs, do these exist? The B-314 has an aileron trim limit of 12.5 degrees but the sim insists on giving KEY_AILERON_TRIM_LEFT/RIGHT/SET a maximum angle of ten degrees. I would have thought you should be able to set this in the .cfg file?
 

rcbarend

Resource contributor
Messages
434
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netherlands
Hi again :) , in this thread ....
As far as I know, the max. angles of the AileronTrim and Rudder-Trim are fixed values (in FSX).
That is: not changeable in the aircraft.cfg, and (maybe somebody knows for sure ?? ) not in the .air file too.

But you can highly change the influence of AileronTrim and RudderTrim on the flightmodel with
aileron_trim_effectiveness =
rudder_trim_effectiveness =
in the aircraft.cfg.

And that works perfect.

Cheers, Rob
 

DragonflightDesign

Resource contributor
Messages
760
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northernireland
Thanks again Rob. So... a bit of mathematical kludgery is required to make the trim indicators appear to be in the 'correct' places.... :D
 

rcbarend

Resource contributor
Messages
434
Country
netherlands
Thanks again Rob. So... a bit of mathematical kludgery is required to make the trim indicators appear to be in the 'correct' places.... :D
Correct....
So if you know the real-life figures for max. AileronTrim and RudderTrim deflections, it would be best to re-work the value scale of (A:AILERON TRIM PCT,percent) and (A:RUDDER TRIM PCT,percent) from -100 to +100, to resp. -12.5 to +12.5 degrees and -?? to +?? degrees, for these trim indicator gauges.
 
Messages
26
Country
canada
There is "rudder_trim_limit = 0 ; Rudder trim max deflection angle (absolute value) (DEGREES)"

No idea if it actually works.
 
Messages
1,856
Country
us-ohio
There is "rudder_trim_limit = 0 ; Rudder trim max deflection angle (absolute value) (DEGREES)"

No idea if it actually works.
And you obtained that info from where? One of the SDKs? If so, which?
 

rcbarend

Resource contributor
Messages
434
Country
netherlands
There is "rudder_trim_limit = 0 ; Rudder trim max deflection angle (absolute value) (DEGREES)"

No idea if it actually works.
Well, I do ... It doesn't work.
That is: tested in FSX-Accel.
I can't test it in any P3D version myself, but I highly doubt if it would work in P3D.

In FSX-Accel, I added
rudder_trim_limit = 30
in the [airplane_geometry] section of a few aircraft.cfg files.
But the result of reading (A:RUDDER TRIM,degrees) always results in a value between -10 and +10 max.
For whatever value of rudder_trim_limit = ...

And, as I expected, the same goes for adding aileron_trim_limit = ... to the aircraft.cfg: (A:AILERON TRIM,degrees) is always between -10 and + 10.
Hence my conclusion in post#2: it's fixed, and cannot be configured.

Again, I tested this in FSX-Accel, but I would be highly surprised if this feature is actually implemented differently in P3D.
Would be curious to know in which document you read "rudder_trim_limit = 0 ; Rudder trim max deflection angle (absolute value) (DEGREES)"
But even if you did, I'm still betting it won;t work in P3D.
Untill proven otherwise, of course ....:)

Rob
 
Messages
68
Country
portugal
In Hervé's document there's only reference to the elevator trim limit and it reads:

"Positive value, maximum pitch trim deflection. Up and down limits are
equal, different limits can be set via FSUIPC offsets."

Maybe FSUIPC could be used too in that case ?
 

rcbarend

Resource contributor
Messages
434
Country
netherlands
In Hervé's document there's only reference to the elevator trim limit and it reads:

"Positive value, maximum pitch trim deflection. Up and down limits are
equal, different limits can be set via FSUIPC offsets."

Maybe FSUIPC could be used too in that case ?
I don't think so.
FSUIPC uses SimConnect as interface, and it simply doesn't work in the core sim (unlike for pitch trim).
 
Messages
26
Country
canada
And you obtained that info from where? One of the SDKs? If so, which?

By looking through the executable with a decompiler. There are quite a few things that don't appear in any flight model or SDK but I haven't tried most of them.
 
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