Blade Fold/Wing Stow Sequence
The V-22 is fully shipboard compatible with the world's first complete blade fold and wing stowage system. It is able to operate off all US Navy L-class amphibious ships, the LHA/LHD assault carriers, and can be stowed on full size CV/CVN carriers.
For stowage the wings are rotated to lie above and parallel to the fuselage to create a compact rectangular volume. The automatic wing and rotor folding sequence can be completed in 90 seconds in a 60 knot wind. It can be interrupted or stopped at any point to facilitate maintenance. Manual operation is possible in the event of a system failure.
Once the sequence is initiated, the proprotors turn themselves to a predetermined position. This is called indexing the blades. When complete, one blade on each side is pointing inboard. The remaining four blades automatically fold until all six blades are pointing inward, parallel to the wing. Next, the nacelles begin rotating from the upward, helicopter position to the horizontal, cruise position. Simultaneously, the wing swivels clockwise until the starboard nacelle is positioned in front of the aircraft's nose and the port nacelle is positioned above the fuselage just forward of the vertical tails. This completes the blade fold/wing stow sequence. When folded, the V-22 fits into a space 63 feet long, 18 feet 5 inches wide, and 18 feet high.