Hi :-)
I think the eternal discussion about Twin versus Single is just going into the next lap...
Twin vs Single is - IMHO - a quiet personal question: I prefer not having to swith to "glider mode" in an instance, especially whilst near the mud. Someone else might fear the asymmetry more than "gliding into the night". For each one his own...
Question: Is a turbine running on its design goal, thermodynamically speaking, more prone to failures than a de-rated, larger turbine? I do remember reading a tech article about the de-rated turbines being more prone to carbon residues etc. - literally negating the benefits of lesser thermal strain...?!
Btw, I would never try to fly from Seattle to Miami NONSTOP in a PROP *shudder* :-)
Kind regards,
Peter