A few weeks ago, Curt reported that the JSBSim C172 is showing a very strong tendency to roll and yaw left, even when in level flight -- I've noticed the same thing for a while.
This morning I ran some tests. 1. I set P_FACTOR in c172.xml to 0.0 (it was 10.0), and saw no significant change. 2. I set IXX in prop_75in2f.xml to 0.1 (it was 1.67), and saw no significant change. 3. I tried starting the plane level at altitude with the engine idling, and saw exactly the same problem (even after I shut off the engine). 4. I unplugged my joystick and rudder pedals in case there was a miscalibrated axis somewhat, and saw exactly the same problem. 5. I reran these tests with the C182 model, and saw exactly the same problem. In other words, something in JSBSim other than propeller-related effects is causing the planes to roll and yaw left. Here's an easy way to reproduce the problem: fgfs --aircraft=c172 --altitude=3000 --vc=90 --prop:/controls/magnetos=0 After 12 seconds, the plane is in a 30deg left bank, and after 24 seconds, it's in a 60deg left bank (this can be reproduced with the c182 as well). There do not seem to be any Cn* or Cl* coefficients in the JSBSim config file that would trigger this problem. Does anyone have any ideas? All the best, David -- David Megginson [EMAIL PROTECTED] _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
