Yeah, even with just a blip of turbulence, the aircraft can become
completely unflyable ... or long term cycles between flyable and
unflyable (if you can manage to stay aloft during the unflyable
periods.)

Curt.

Melchior FRANZ writes:
> * Richard A Downing FBCS -- Tuesday 01 July 2003 19:59:
> > 
> > Something has changed for the worse in CVS today.  Just flying the c172-ifr, I 
> > can't now get full throttle to give full power.  After climbing slowly to maybe 
> > 500 ft there are massive and unpredictable changes in height and speed of the 
> > aircraft, the turn and bank shows the aircraft swinging badly out of trim.  I 
> > tried a complete download, make clean etc of both SimGear and FlightGear - but 
> > same effect.  Am I alone?
> > Richard.
> 
> This would be this patch then (sunday, 2117z):
> 
>   CVS: source/src/FDM/JSBSim FGAtmosphere.cpp,1.8,1.9
>           FGAtmosphere.cpp 
>   Log Message:
>   Avoid strong oscillations at turbulence extremes.
> 
>   -     MagnitudedAccelDt = 1 - 2.0*(double(rand())/double(RAND_MAX)) - Magnitude;
>   +     MagnitudedAccelDt = 1 - 2.0*(double(rand())/double(RAND_MAX));
> 
> 
> ... not that I could reproduce that behavior. But at 500 feet
> stronger turbulence kicks in and the magnitude seems to be
> increased rather than reduced now.
> 
> m.
> 
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-- 
Curtis Olson   IVLab / HumanFIRST Program       FlightGear Project
Twin Cities    curt 'at' me.umn.edu             curt 'at' flightgear.org
Minnesota      http://www.menet.umn.edu/~curt   http://www.flightgear.org

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