On Wed, Dec 8, 2010 at 11:14 PM, Roland Haeder wrote: > I use the following call to start FGFS: > -------------------------- > fgfs... ... > --aircraft=aircrane --enable-fpe
Thanks, that actually always reproduces it. > And the temperature at EDDL can now really be at 0 deg. Celsius because > of winter time. :) Yep, looked like a mix-up of Kelvin vs Celsius at first. But that's not the problem. It doesn't depend on season or environmental temperature. The specific calculation failing doesn't even use the actual temperature. So the aircrane always crashes when using --enable-fpe. The trigger is a missing configuration setting in the FDM description. The YASim FDM seems to rely on a valid "cruise" and an "approach" configuration. Several things are not properly initialized unless both configurations are present in the XML file. The aircrane only provides an "approach" configuration. This results in stupid default values being used, so it eventually starts calculating with a temperature of 0 Kelvin (where the classic laws of aerodynamics, gas and pressure seem to fail...). Adding the following configuration to "aircrane.xml" fixes this issue: <cruise speed="84" alt="0"> <control-setting axis="/controls/engines/engine[0]/throttle" value="1.0"/> </cruise> That's a configuration I copied from a different helicopter. Maybe helijah/Heiko can comment on the correct FDM settings for the aircrane. The underlying problem with YASim should also be fixed. Not nice when missing config settings result in the FDM going wild. In fact, this could explain a number of issues why specific YASim aircraft run into infamous NaN problems (few people use "--enable-fpe" to abort on floating point exceptions, so divisions by zero result in "Not-a-Number" results). There maybe more config options (and aircraft) where YASim goes mad when settings are missing... cheers, Thorsten ------------------------------------------------------------------------------ This SF Dev2Dev email is sponsored by: WikiLeaks The End of the Free Internet http://p.sf.net/sfu/therealnews-com _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel