"I take it that there is a sync shaft so in the event of a single engine failure, the remaining engine can drive both props / rotors (or whatever they are called on this aircraft)."
It would appear not. After reading the journal article I found the following:
"The Osprey's big problem is that it risks losing lift in just one of its two engines, in which case it will flip over and begin to fall upside down. This has led to previous test flight crashes which were fatal to all concerned."
