Was actually wanting to know about first hand 100% mechanical engine failures because I've never actually met anyone who's had one!
The stats show than singles are pretty much as safe (if not safer) but I guess its the 'what if factor'.
Here is something I've always wanted to know ... In a fixed wing you have (to a larger extent) seperate systems as a result of individually mounted engines but in helos (aside from the engines) the majority of other systems are shared.
Does this represent a lower safety threashold for twin helos vs. twin fixed wings?