Is that so?
My understanding is that in both cases, for the V2 scenario, a single engine out is considered. This means that a 4-holer must be able to climb out safely on three engines, whereas a twin must on one. Hence one engine on a twin has considerably more thrust reserves than two on a quad.
Apples and oranges, you’re describing a completely
different situation, engine failure on departure in a twin
nearly always mandates an immediate return with a possible
exception of weather minimums being adequate for departure
but not a return in which case you’re going to your
departure alternate
And yes, of course performance on one in
that case will be better than a four engine aircraft that
has lost two
I was referring to the en-route phase, a long way from
land or over hostile terrain I’d be far happier in a B707
that has lost two than ANY twin that is down to one
operating engine