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. The Grumman F6F Hellcat was originally conceived as an advanced version of the U.S. Navy's then current World War II front-line fighter, the F4F Wildcat. How to attend