 The release at 08 : 15 ( Hiroshima time ) went as planned , and the Little Boy took 43 seconds to fall from the aircraft flying at 31 @,@ 060 feet ( 9 @,@ 470 m ) to the predetermined detonation height about 1 @,@ 968 feet ( 600 m ) above the city . Enola Gay traveled 11 @.@ 5 mi ( 18 @.@ 5 km ) before it felt the shock waves from the blast . Although buffeted by the shock , neither Enola Gay nor The Great Artiste was damaged . 
