Thanks to sharp-eyed Steve Trimble at the Quad-A show, and his The Dew Line blog, we now know about Bell Helicopter's Hybrid Tandem Rotor (HTR) concept.
According to Steve's interview with Bell's exec VP for government programs Robert Kennedy, the HTR could achieve a forward speed of 225kt, compared with around 170kt for a conventional helicopter and more than 300kt for the V-22 tiltrotor.
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