On Samstag 05 November 2005 17:21, Vassilii Khachaturov wrote:
With either jsbsim or yasim aircraft, when is in the vicinity of the
(North) pole, the AGL (as seen in the HUD) goes into 2*10^7 ranges. You
can either start up with --lat=90 (and any longtitude you please), or, if
you dislike the singularity of --lat=90 at the startup, use --lat=88 and
head north. Soon past 89 degrees you'll see it happening. (I initially
discovered it by trying to start up with santa at the pole :) ).
When this happens, one can fly below earth (altitude-wise, as indicated on
the altimeter) down and down w/o a problem on an aircraft (like hunter)
that doesn't allow it normally.
I don't think this is a particuarly annoying aspect of the flightgear
universe, but maybe somebody will get a hint to another bug from this
report.
It is just that there is no scenery for that area, I think.
The poles have a singularity in the lat/lon/altitude coordinate system. That
singularity might be the reason these places do not even have a water
surface, at least I guess that reason ...
It is like that all the time I know flightgear.
This is also not the only limitation in this area. JSBSim was for *very* long
time unable to fly near the poles. It is for JSBSim still the case that
aircraft with some kind of angular rate controled fly by wire flight control
systems will fail badly.
Also all these FDM's doing updates in the nonlinear lat/lon space handling
them like usual linear vectors will behave strange near the poles and they
will just bail out if you cross the poles exactly (unlikely with floats, but
may happen).
Greetings
Mathias
--
Mathias Fröhlich, email: [EMAIL PROTECTED]
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