AnMaster wrote:
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> Wouldn't turning the turbulence down make other FDMs less realistic?
>
> Also if JSBSim autopilots are affected, how come autolanding with Concorde
> while
> turbulence is enabled (but no crosswind) works perfectly? Concorde uses JSBSim
> after all...
>
> /AnMaster
>
>
Here is a quote from the Concord-autopilot.xml
- a lookahead 8 s could accelerate the convergence of heading hold.
But that creates roll oscillations, around 800 ft AGL during
autoland (nav1),
with turbulence (ins), and during the transition to magnetic
heading hold (vor and ins).
Also, the Concord AP is controlling the rudder. Neither the real kap140
nor the real Century IIb nor the real Century III nor the nor Altimatic
IIIc control the rudder. If you turn on auto coordination, the
oscillations go away. These controller cascades were done to model
available documentation on these autopilots. By coupling in the rudder
in the AP configs, one could likely stop the oscillations. But that
would be very unrealistic. Further, that is not necessary for the pa28
nor the pa24 which use YASim and these same autopilots.
> Melchior FRANZ wrote:
>
>> * Laurence Vanek -- Friday 07 December 2007:
>>
>>> Although I like realistic flight my ILS approaches we very unstable with
>>> the turb values given in the Preferences.xml file [...]
>>>
>> But, but ... some have just told us that we shouldn't make it too
>> easy, or fgfs will be perceived as a toy. So I'd rather turn the
>> values *up*.
>>
>> m. :-P
>>
What is proposed is to make the default turbulence = 0.0 at start-up,
not turning off turbulence modeling. You can still use the weather menu
to set the desired turbulence or you can use the "advanced " weather
option in fgrun to set the turbulence or the command line --turbulence =
to set the desired turbulence. But note that for some reason, in fgrun,
when you set turbulence=0.0, the command line setting turbulence disappears.
-Dave Perry
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