Climb into the cockpit of some of the world's most exciting experimental and test aircraft, like the revolutionary Vought XF5U. Nicknamed the "Flying Pancake," the XF5U's unique saucer shape fueled rumors that the United States government was secretly testing a UFO! Fascinating stories about fabled prototypes and designs that would shape aviation history abound in this authoritative book edited by aviation expert Jim Winchester. Spreads feature plenty of historical photographs, full-color graphics, timelines and fun facts that showcase the genius behind some of the greatest designs in aviation history. Though many of these designs never flew, this new book in the Aviation Factfiles series is definitely ready to fly.