It's a totally different type of aircraft. BTW, the Osprey cannot autorotate in an emergency. Guess thats why they have the APU and drive transmission for emergencies.
So, what certifications are required to pilot one? helluvacopter? fixed-wing? or a confusion of both?
Exactly.
BTW, the Osprey cannot autorotate in an emergency.
As with any compromise, it can't autorotate like a helicopter, and it's a more precarious design than a fixed wing.* The best (when it works) and the worst (when it doesn't) of both worlds.
Like I said, if the Marines like it, good for them. Otherwise, I wouldn't expect them to cotton to it in general.
* I'm not sure the flying bananas can autorotate with gearbox malfunctions either, can they?