> I helped implement this with Tony a few years ago. As I recall, the > value was from 0 to 1, where 0 represents no turbulence, and 1 > represents the most severe turbulence that we model. You couldn't > represent turbulence simply in feet/second, because it consists of > both movements and rotations. > > Note also that the current system has problems for multiplayer mode. > For example, if the turbulence were set to .5 (which should be pretty > bad), a J3-cub and a Boeing 747 flying into the same airport will > experience the same turbulence, while in reality turbulence that would > tear a wing off a J3 cub might not do much more than jiggle the drinks > in the 747. As soon as you consider a world with more than one plane > flying at once, we have to think about modelling the turbulence not by > its effects on the plane, but by its source air motion. > > Dave
Yes, the rotational aspects of turbulence will be dependent on the specific aircraft characteristic length in the relevant axis - we've got that covered, so different sized aircraft will see rotational effects of turbulence correctly (theoretically ;-). And we have a direction unit vector and a magnitude vector, which should take care of it all. What I haven't seen yet is how the magnitude of the turbulence is controlled in JSBSim from a setting that is passed through in JSBSim.cxx (the interface). I'd expect to see a maximum value of some kind, because a normalized gain doesn't tell me anything. A value from 0 to 1 is fine, if a total expected turbulence magnitude is passed in, because I want to convert it to a wind velocity. A total range of from 0.0 to 1.0 ft/sec isn't representative - and I'm sure that's not what is intended - but that seems to be what is happening with turbulence. 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
