I have read the material. I have been studying twin engine aerodynamics however this is a legitimate question. Not every airplane has a critical engine; understood. I am not asking a hypothetical question either. Take a Dash 8 for instance would a Dash 8 have a critical engine if both engines operated clockwise? A Dash 8 and a PA-44's aerodynamics are highly different (i.e high wing vs low wing; perhaps higher torque; etc). That's what I am asking. Do all twin engine aircraft (assuming both propellers operated clockwise) have a critical engine? I understand why there is a critical engine and how we come to the conclusion I am just trying to fully understand this principle.