For six decades, engineers have struggled to combine high speed transport with vertical takeoff and landing capability. Today, two types are in competition for the next generation of rotary wing transports - tilt rotors and compound helicopters. Find out the history behind tomorrow's rotorcraft and the challenges of the future.

The Ask An Expert lecture series at the Steven F. Udvar-Hazy Center is presented every 2nd and 4th Thursday at 12:30 PM. A Museum staff member talks to the public about the history, collection, or personalities related to a specific artifact or exhibition in the Museum.