On Mon, 2002-11-18 at 14:41, David Megginson wrote: > Curtis L. Olson writes: > > > BTW, Andy, how hard would it be to accept an initial airspeed for the > > YASim models so we can do in-air starts with those? > > Andy's concern has been the obfuscation around velocities. We have > > - calibrated airspeed in knots (forward from the nose of the plane) > - mach number (ditto) > - UVW wind/body speeds (u/v/w) > - NED speeds > > The NED *should* be the ones we save and restore, since they are the > only independent ones (we don't have to set the orientation first); > however, because of problems with LaRCsim, we had to make UVW > canonical quite a while back. It would be nice to fix that and make > NED canonical first, then twist Andy's arm until he supports them in > YASim. > > There's also more to the problem. If we're restoring a saved flight > then everything's fine, since all of the FDM state is already valid. > If, on the other hand, we're starting in the air, then we need a > general trimming routine like the one Tony wrote for JSBSim and > LaRCsim to avoid violent oscillations at startup.
For the record, I did not write a trimming routine for LaRCsim. > > > All the best, > > > David -- Tony Peden <[EMAIL PROTECTED]> _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
