On Wednesday 14 November 2001 09:06 am, you wrote:
> Hi,
>
> I already whined on fgfs-user about ^U not working since about two weeks.
> Now I've looked further into that problem, still without solution, but at
> least with some details. (Of course, I have updated plib, SimGear,
> FlightGear and FlightGear-Data from cvs before, this time even with "cvs up
> -A"! My copy should therefore be an exact copy of the CVS data. Furthermore
> I did all tests with and without using my local settings in ~/.fgfsrc,
> without any differences.)
> I found out, that it's in fact not a problem with the keyboard settings,
> as ^U does still work with "magic carpet" and "larcsim". Furthermore,
> not only changing the altitude in JSBSim via ^U, but also via the new
> property-picker and via telnet yields the same results:
> When started from KSFO every external manipulation of the altitude
> places the aircraft in the sea at 5ft AGL. The following snippet from
> the logs shows something strange: Although I am at 89 feet altitude
> and the altitude is correctly passed to FGJSBSim::setAltitude, pressing
> ^U triggers a =Ground=(!) trim, which does of course not have a
> desirable effect on the position:
>
>
> find_props: allocation of node
> files->2 longitude-deg = '-122.363764' (double)
> files->3 latitude-deg = '37.617349' (double)
> files->4 altitude-ft = '89.868794' (double)
> files pointer=1159395616
> FGJSBsim::set_Altitude: 1089.87
> lat (deg) = 37.6173
> Ground Trim
> Initial Theta: 2.535
>
> Trim successful
>
> JSBSim State
> Weight: 2036 lbs. CG: 42.2, 0.0, 40.3 inches
> Flaps: Up Gear: Down
> Speed: 0 KCAS Mach: 0.00
> Altitude: 5 ft. AGL Altitude: 5 ft.
> Angle of Attack: 0.00 deg Pitch Angle: 3.11 deg
> Flight Path Angle: 0.00 deg Climb Rate: -0 ft/min
> Normal Load Factor: 0.00 g's Pitch Rate: 0.46 deg/s
> Heading: 298 deg true Sideslip: 0.00 deg
> Bank Angle: 0.00 deg
> Elevator: 0.00 deg Left Aileron: 0.00 deg Rudder: 0.00 deg
> Throttle: 100.00%
> Wind Components: 0.00 kts head wind, 0.00 kts cross wind
> Ground Speed: 0 knots , Ground Track: 0 deg true
> Trim complete
> find_props: allocation of node
> files->2 longitude-deg = '-122.357197' (double)
> files->3 latitude-deg = '37.617382' (double)
> files->4 altitude-ft = '5.103165' (double)
>
>
>
>
> I had a look at JSBSim.cxx and put a SG_LOG line into FGJSBsim::do_trim to
> show if fgic->GetVcalibratedKtsIC() is involved. It is! This value was
> always reported to be zero, so it's no wonder that I always get a "Ground
> Trim".
The fgic object always remembers that last state jsbsim was initialized to.
Since the last state you initialized to was on the ground at KSFO with 0
speed, that's how it reinitializes JSBSim when Ctrl-U is pressed.
What needs to happen is the code that handles Ctrl-U should reinitialize
the sim at the last flying state but with the new altitude.
>
>
>
> SG_LOG(SG_FLIGHT,SG_INFO,"FGJSBsim::do_trim: " <<
> fgic->GetVcalibratedKtsIC() ); if(fgic->GetVcalibratedKtsIC() < 10 ) {
> fgic->SetVcalibratedKtsIC(0.0);
> fgtrim=new FGTrim(fdmex,fgic,tGround);
> } else {
> fgtrim=new FGTrim(fdmex,fgic,tLongitudinal);
> }
>
>
> Why does a Ground Trim also change the longitude?
> Why is fgic->GetVcalibratedKtsIC() always zero?
> Can someone familiar with JSBSim imagine what's wrong (and why it could
> just happen on my installation, although this is without any doubt a 1:1
> copy from CVS)?
> What else can I do to find the problem? (I'm not really familiar with
> JSBSim.)
>
> m. :-)
>
>
>
> PS: I'm running fgfs (CVS HEAD from today) under a Linux 2.4.14 kernel.
> Everything is compiled with a (known as non-buggy) gcc 2.95.2 on a SuSE
> 7.1.
>
>
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--
Tony Peden
[EMAIL PROTECTED]
We all know Linux is great ... it does infinite loops in 5 seconds.
-- attributed to Linus Torvalds
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