Dave,
The reliability point is valid (ish), but the weight consideration once again rules it out.
Say we need 224hp, we could use
(a) 2 x Lycoming O-235L producing 112hp @2600rpm and weight 99kg each (198kg and 224hp total).
Or...
(b) 1 x Lycoming O-540J producing 235hp @2400rpm and weighing 165kg. (This is a derated engine aswell while the O-235's are screaming!)
This is why it hasn't been done!
It's expensive, heavy and more complicated....
CRAN
