Erik Hofman wrote:
> It's way more extreme than that, the dewpoint once in a while seems to
> reset to -2.8308 from it's current value causing the humidity to jump
> way beyond 100% (I've seen 1200%). I could limit the humidity to 100%
> but that only hides the problem.
>
> I did not find why the dewpoint varies that much.
>
> Erik
>
>
I have made a log in function _recalc_alt_dewpoint() with the last
environment.cxx from CVS (rev 1.31).
Here is written at level flight:
step to _recalc_alt_dewpoint () elevation_ft is 41981.8 dewpoint_degc is
-56.5 temperature_degc is -56.5
step to _recalc_alt_dewpoint () elevation_ft is 41981.8 dewpoint_degc is
-2.8308 temperature_degc is -2.8308
step to _recalc_alt_dewpoint () elevation_ft is 41981.8 dewpoint_degc is
-56.5 temperature_degc is -56.5
step to _recalc_alt_dewpoint () elevation_ft is 41981.8 dewpoint_degc is
-56.5 temperature_degc is -56.5
step to _recalc_alt_dewpoint () elevation_ft is 41981.8 dewpoint_degc is
-56.5 temperature_degc is -56.5
step to _recalc_alt_dewpoint () elevation_ft is 41981.8 dewpoint_degc is
-56.5 temperature_degc is -56.5
step to _recalc_alt_dewpoint () elevation_ft is 41981.8 dewpoint_degc is
-56.5 temperature_degc is -56.5
step to _recalc_alt_dewpoint () elevation_ft is 41981.8 dewpoint_degc is
-56.5 temperature_degc is -56.5
step to _recalc_alt_dewpoint () elevation_ft is 41981.8 dewpoint_degc is
-56.5 temperature_degc is -56.5
step to _recalc_alt_dewpoint () elevation_ft is 41981.8 dewpoint_degc is
-2.8308 temperature_degc is -2.8308
step to _recalc_alt_dewpoint () elevation_ft is 41981.8 dewpoint_degc is
-56.5 temperature_degc is -56.5
step to _recalc_alt_dewpoint () elevation_ft is 41981.8 dewpoint_degc is
-56.5 temperature_degc is -56.5
step to _recalc_alt_dewpoint () elevation_ft is 41981.8 dewpoint_degc is
-56.5 temperature_degc is -56.5
step to _recalc_alt_dewpoint () elevation_ft is 41981.8 dewpoint_degc is
-56.5 temperature_degc is -56.5
So problem is in the value of temperature_degc.
It seems to be a couple of errors connected with environment.
1) File: fg_commands.cxx, routine: static bool
do_set_dewpoint_sea_level_degc (const SGPropertyNode * arg)
variable dewpoint_sea_level_degc is defined as
double dewpoint_sea_level_degc =
arg->getDoubleValue("dewpoint-degc", 5.0);
may be correct is:
double dewpoint_sea_level_degc =
arg->getDoubleValue("dewpoint-sea-level-degc", 5.0);
2) File: environment.cxx, routine: void interpolate (const FGEnvironment
* env1, const FGEnvironment * env2, double fraction, FGEnvironment * result)
the lines :
result->set_dewpoint_degc
(do_interp(env1->get_dewpoint_sea_level_degc(),
env2->get_dewpoint_sea_level_degc(),
fraction));
may be correct is:
result->set_dewpoint_sea_level_degc
(do_interp(env1->get_dewpoint_sea_level_degc(),
env2->get_dewpoint_sea_level_degc(),
fraction));
With respect,
Alex
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