On Friday 17 Jul 2009, Hannes Schweikl wrote:
> Hi,
>
> I am using FG for testing different routing algorithms for UAV's.
> In order to compare different routing algorithms, I would need
> constant weather conditions for all the simulations.
>
> Is there a way to keep the weather conditions constant? So either
> there is no wind at all (which would be preferred) or there is a
> constant wind from always the same direction (even if I quit a FG
> session and open a new one).
>
> I know about the command line option for wind from a certain
> direction and turbulences. However there still seems to be some
> kind of wind. But since my UAV model is more sensitive to wind
> than bigger aircraft, I would prefer to have no wind at all.
>
> Please let me know, if there is a way to do this.
>
>
> Thanks,
> Hannes

You used to be able to do this by including the relevant config 
settings for the environment in your .fgfsrc file, along with an 
entry to disable metar, or just disable metar on the command line 
so you could try real weather after initial testing (the default 
for metar weather used to be 'off' but it may have changed since 
then).

I used to use the following lines in my .fgfsrc file to change the 
visibility settings (as I was happy to use the default wind speeds, 
as long as they were constant) but you could use similar entries to 
set the wind speeds for each level to zero if you want.

--prop:environment/config/boundary/entry/visibility-m=6000
--prop:environment/config/boundary/entry[1]/visibility-m=10000
--prop:environment/config/aloft/entry/visibility-m=20000
--prop:environment/config/aloft/entry[1]/visibility-m=30000
--prop:environment/config/aloft/entry[2]/visibility-m=40000

LeeE

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