What I don't understand about this issue: why even zero velocity? There should never be zero velocity, since there is nearly always some wind,
It is a classic problem in flight simulation, and simplistically a lot of the maths don't function very well at low/zero velocities. JSBSim models things properly so it becomes (or became) a problem causing jitter and strange effects.
I 100% agree with the way Jon has fixed this. Suggesting that there is simpler way of doing it indicates a lack of understanding of the complexities.
IME the usual fix is to extend the logic such that when the aircraft is static a flag is set and various things are done differently. This way of doing things is sufficient to get approval for Zero Flight Time big-sims with all of the world's aviation authorities.
The equations almost certainly could be changed to more accurately model the real world, such that the zero velocity case is balanced out nicely, however I suspect that this would be a significantly huge amount of largely redundant modelling.
Just my 2cts worth. --Richard ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click _______________________________________________ Flightgear-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/flightgear-devel
