Nice piece of code -- adds some realism
It normally takes longer to retract the gear than to extend. You could also
tweak the times based on air loads, hydraulic pressure, G loads, roll, pitch,
yaw, etc and get down in the weeds on the matter ;-)
Varying transit times based on direction of gear travel is enough. :-)
Not all that familiar with the actuator model; is it possible to set the
rate_limit based on gear-cmd-norm setting as in the kinemaic model?
And is it necessary to explicitly set the "use FCSGearPos" flag or does it
happen internally based on the xml file?
Cheers
Jack
----- Original Message -----
From: "Torsten Dreyer" <tors...@t3r.de>
To: "FlightGear developers discussions"
<flightgear-devel@lists.sourceforge.net>
Sent: Thursday, August 30, 2012 5:15:21 AM
Subject: Re: [Flightgear-devel] Gear transit times
Am 30.08.2012 03:51, schrieb castle...@comcast.net:
> Hi,
>
> Is it possible to specify gear up and down transit times for each gear?
> In real airplanes the gear never ( well rarely, maybe ) sequence in
> perfect unison. In reviewing the xml files for the 737, I note there
> are transit times defined for each flap position, but the kinematics for
> the gear is only a single value for up or down based on gear selection
> state.
>
> Is this something in Nasal? or native code or something in JSBsim?
I use the <actuator> in JSBsim to model the gear in the SenecaII, using
the rate_limit property implement the transit time.
The flightgear autopilot system has a so called noise-spike filter that
can model transit times.
The flightgear xml based autopilot system can run at FDM rate or at
frame rate, btw. Using a <autopilot> tag in your aircraft's -set.xml
adds the autopilot at fdm rate, using a <property-rule> runs the same
config at frame rate.
Torsten
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