quite right bob
Combining happens; topologically somewhere, how complex is a modern twin gearbox? 16 gears !? how many bearings?
I think terminus and Bravo have a point; the reason people think they want twins is that they think they don't want to get wet if they have to land on water. Yes NS may be considered as 'hostile' because you might get your feet wet and chilly (once every 10,000 years), but it needs to be factored by the chance of being dead because your gearbox (etc) breaks.
The logic doesn't add up, and the maths is FRAUDULENT!!
You have to have a pretty good chance of death on engine fail to justify a twin. Should twins even be allowed day/VMC/non hostile environment: NO! It is stoopid.
Over jungle, if it is a high proportion of the operating regime, then yes - but only just.
Bravo something in your post made me want to look up the origin of the term; "as thick as monkey f@Łk" i don't know exactly what it was but google could not help me....