V-22 can't autorotate. Say what?

[forget]

Hardly likely.

Also, one engine can power both rotors if required because of a cross-coupling capability.

http://avia.russian.ee/helicopters_e...tol_osprey.php

Beaten to it.

Plus - Performance

Service ceiling, ft (m) -- 26,000 (7,925)
Service ceiling, one engine inop, ft (m)
11,300 (3,444)