"Mary Shafer" wrote in message
...
No, no, no. Only at the very beginning do we use predictions based on
the design. Those predictions come from the wind tunnel, CFD, and
prior experience. The instant we get such data from flight we update
the simulation with the actual, not the predicted, numbers.

Ok, I take your correction. But my point was essentially that pc sims
generally concentrate on the back end of the simulation process, i.e. what
is represented to the operator, rather than the front end, the inputs to the
process. i.e. accurate descriptions of the airframe qualities and
environmental modelling.

Si