JohnD
If the rotor on the 60 is so tolerant to damage why was it sucking rotor blades in peace time operations? The same vintage design on the 76 could not survive a small mark do to a lighting strike. Bell's blade desighs on the 412 and 58D which are similar in concept to the V-22 have demonstrated significant survivability. Pictures are available which shows what an RPG can do to a 58D (if did go off) and the ship recovered to its base.
The Sultan