Use on questions specific to the V-22 Osprey and its variants. The V-22 is a tilt-rotor so has many handling and aerodynamic issues specific to the type.
The Bell Boeing V-22 Osprey is a tilt-rotor designed for cargo and personnel transport with the VTOL performance of a helicopter but much faster and more efficient forward flight. Designed for military use, it's operated by several US armed forces as well as the Japanese JSDF.
The Osprey is very recognisable, so it should be easy to know if your question is about the Osprey, but only use the tag if your question is specific to this type.
For more information, see the Wikipedia page as always. It has lots of pictures.