I believe one advantage of tilt rotors versus helos is their ability to quickly climb and cruise at altitudes beyond MANPADS. There are many things Bell can do to reduce detection of this tilt rotor. They are using composite materials for most of the airframe structures and rotor. The straight single-piece wing makes it easier to manufacture and repair, and also simplifies the interconnect rotor drive system. One major reason for using the non-tilting engine was due to the fact that there were no suitable tilting turboshaft engines available.