Big piston,. .. .Can a pilot fly successfully without knowing this? Sure, but I want to know the how and the why. When a question is raised, I don't always except the first answer especially when it conflicts previous information. Oh well.. .. .FYI, reducing power on the operating engine is only one way to prevent departure from controlled flight. Two others,. .. .1. Reducing Pitch and . .. .2. Having the knowledge to prevent this situation in the first place.. .. .There has been a push in this area (FAA types)to recover from a Vmc situation by just reducing the pitch attitude. I haven't bought into this argument. I beleave you must use pitch and power together to save your tail. It's a long story, but at least the meetings are interesting.