A group of friends and I were having a discussion about multi-engine a/c and ratings a few days ago and were commenting a Skymaster at the airfield. One of the more interesting hypotheses was that 337 time cannot be logged as multi-engine - apparently, as the explanation goes, due to the centerline-thrust concept, where the a/c does not behave like a classical twin in an engine-out situation i.e. no "asymmetric" problems.
This sounds pretty far-out to me, so perhaps someone can shed some light on the subject. If it has two engines, it is multi-engine - how do you log it then? When can you exactly log multi-engine time - and concerning the original topic - what IS multi-engine time anyway?