There is a bug in JSBSim causing multiengine aircraft with counterrotating props suffer from excessive yaw when engines are running. Significant aileron deflection is required to fly straight and level.
I tracked down that issue and finally came to FGPropeller.cpp line 198: vH(eX) = Ixx*omega*Sense; If I understand correctly, this is some kind of force along the rotating axis of the propeller and it should not be multiplied with Sense (unless someone mounts a wrong propeller...) Making the line vH(eX) = Ixx*omega; removes the unwanted yaw and creates symmetrical forces and moments. The only aircrafts using counterrotating props are the P-38L and the SenecaII. All others should not be affected by this patch. Greetings, Torsten ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
