.
I sometimes wonder just how many incidents have ocurred where a twin has suffered the failure of one of its engines and subsequently gone on to perform a safe landing.
Twins certainly seem like the sensible/responsible thing to do and are now well established in the commercial domain but, like Dennis, I also wonder about ..
.. we shouldn't forget that the power plant is just one component that keeps us airborne. We also really need two M/R hubs, two MRGBs, ditto T/R transmission & blades and swashplates ...
Thinking of North Sea incidents I seem to recall remarkably few directly attributed to powerplant failure whereas there were numerous involving 'other' component failures!
Sav