FORT WORTH -- Bell Helicopter showed off a model of its "third-generation" tiltrotor technology to hundreds of spectators on Wednesday at the 2013 Army Aviation Association of America's annual exposition.Bell's V-280 Valor will be able to scale the rugged terrain of Afghanistan at high speeds and altitudes over 6,000 feet, said Chris Gehler, Bell's business development manager for future vertical lift. That's unlike prior tiltrotors that hovered above aircraft carriers, he said.Valor's "clean sheet design" reduces complexity compared with previous generations of tiltrotors, with fewer parts, as well as nonrotating, fixed engines, Gehler said in an interview after the aircraft's unveiling at the Fort Worth Convention Center.John Garrison, Bell's CEO and president, also touted the benefits of the third-generation tiltrotor at the AAAA conference."The name itself makes an important statement of its own,'' Garrison said. "V representing vertical lift, 280 representing its unmatched speed, and Valor as a tribute to the service men and women who approach their jobs with valor every day."The conference runs through Friday at the Fort Worth Convention Center.