As we get into thread drift
Part of the thing here is aerodynamics as per theory is based on essentially stable conditions ie Vs demonstrated by 1kt/sec decleration to the stall. The aero boys (as above) know different but
AFAIK don't have it fully have it worked out.
Each airframe/thrust machine is different but some poor guy doing RPL has problems with limited theory- and RPL used to mean PPL aerodynamics (BAK? used to teach that)