> The SenecaII wing rock with light turbulence appears to result from a > very exaggerated adverse aileron yaw. So I did the same experiment > with the c172p and pa28-140 which both use the kap140. With the default > turbulence, the c172p oscillates so bad that you cannot complete the > approach with the LOC needle going full stop to full stop near the > runway. The pa28-161 (also yasim) is as solid as a rock all the way > down the glide slope with light to moderate turbulence. > > If you watch the oscillation for either jsbsim model, you should note > that when the yoke is rotating counter clockwise, the nose is yawing > right and then finally swings back left, as would be expected with > extreme adverse aileron yaw. > > Most high performance AC show very little AAY except in significant > slow flight. I would not expect that small aileron deflections should > move the nose counter to the roll in a SenecaII or pa24. > > Two questions: > 1. Have others noticed this difference between jsbsim and yasim? > 2. Can this adverse aileron yaw be toned down in jsbsim? > > Regards, > Dave Perry
I have a complete set of stability derivatives for a Seneca-like aircraft in the car. I'll go grab that and take a look and do a "sanity check" with the Seneca. Tomorrow is Columbus Day, and I'm off, so maybe I can do this before tomorrow night. Jon ------------------------------------------------------------------------- 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
