Originally Posted by
Xeptu
You said not to be too pedantic. A Vmca event is still a stall, is it not
Vmc for the 441 (it's different for newer types) is
the minimum calibrated airspeed at which, when the critical engine is suddenly made inoperative, it is possible to maintain control of the airplane with that engine still inoperative, and thereafter maintain straight flight at the same speed with an angle of bank of not more than 5 degrees. It's the rudder moment being weaker than the asymmetric thrust moment.
It may be the same as Vs - which is a function of angle of attack. It may be higher or lower - that's a coincidence of a number of factors. Granted to have a Vmca event you need to be above Vs otherwise you will have an asymmetric stall event first which are equally unpleasant.
The dreaded Vmca rollover of which we've sadly seen many, is not due to an aerodynamic stall. It may be present, but not necessarily. The inner wing may still be generating lift, and likely so in the Renmark crash where Vs was 20kt lower. The Darwin Bras had the stall warning sounding off and on before it went over (but was still probably not fully stalled).