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FS2002/FS2004 Bell X-22A. The X-22 A was designed and built to evaluate Bell's patented dual tandem ducted-propeller configuration for a V/STOL transport. Later, it was configured to serve as a testbed for V/STOL handling qualities using a variable stability control system. Four General Electric YT53-GE-8D turboshaft engines powered it. By Kazunori Ito.