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I have been interested in the ducted fan concept for some years now. As modern warfare becomes more involved with urban terrain, VTOL aircraft will have to contend with the environment. I think at least Bell Helicopter is beginning to see this and has started investigating "Protected Rotor" concepts, witness the "X-Hawk" revealed at Farnbourough this last year.
Anyway here is a picture of an operationalized X-22A that I found several years ago.
Anyway here is a picture of an operationalized X-22A that I found several years ago.