Bell Boeing's Quad Tiltrotor (QTR) transport concept has moved a step closer towards becoming a reality, with windtunnel testing of a 1/5th-scale model having been completed at NASA's Langley Research Center in Virginia last week. The QTR could be a possible contender to meet the US Army's planned vertical take-off and landing Joint Heavy Lift aircraft requirement.

Quad tiltrotor 
© Bell Helicopter

Source: Flight International