as aircraft with counter rotating props have no critical engine.
apart from the P38 of course where both engines are critical
or
Q) Which is the critical engine
A) The female one of course
regarding the term Walt, in the States, I have heard it quoted that you need to meet four, count them, four hundred people who say they were Special Forces before you find one who actually was
...and when you do meet him, don't make the mistake that I did and ask him if Special forces is anything like Special Ed