On 02/22/2007 01:27 AM, John wrote:
>
> Modern avionics and air data computers provide an instantaneous vertical
> velocity and altimeter.
Yes.
> Is there a property/variable in flightgear that does not contain the lag
> present in simple baro systems?
Yes.
> I'm under the impresssion that the
> property called "environment/pressure-inhg[0]" has a lag computed into
> the final value. Is that correct or is that the "instantaneous" value or
> pressure level the aircraft is at and what I'm looking for?
Close.
environment/pressure is (and always has been) the "real" pressure.
It is instantaneous.
The trick is that altimeters and suchlike are not (and should not be)
connected directly to environment/pressure. They are connected to
/systems/static/pressure-inhg ... and *that* has an unrealistically
huge lag built into it. I would argue that there should be "some"
lag, just not nearly so much.
Solving this problem is easy:
1a) Grab the c++ code for my new altimetry and barometry module:
http://www.av8n.com/fly/fgfs/atmo.diff
1b) Apply the patch and recompile.
This fixes it so that the static system and alimter(s) have lag
times that are are configurable (no longer just compiled in).
2) Edit or patch your .xml files to configure the <tau> values for
your static system *and* your altimeter(s). Apply this patch
http://www.av8n.com/fly/fgfs/inst.diff
or at least look at it to see how things are done.
Decreasing the static-system lag from 1 (the previous compiled-in
value) to .1 or even .2 makes things look instantaneous or nearly
so.
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