"Jim Macklin" wrote in message
news%jbg.22154$ZW3.504@dukeread04...
On a single-engine, a door opening is not serious, but a
twin with a door open and the engine on the opposite side
might get interesting. The open door would probably raise
Vmca because of the air flow disruption on the side where
maximum rudder effectiveness would be required.

Yes, I think this best describes the situation that my very experienced
pilot friend twice described about the disruption of the airflow once the
door had popped open.