 The modifications to the #1 aircraft included new wings (8% thickness/"chord" ratio as opposed to 10% thickness/chord ratio of the #2 aircraft) and a new horizontal stabilizer (6% thickness/chord ratio as opposed to 8% thickness/chord ratio of the #2 aircraft).Goodlin's first flight in the modified #1 aircraft was April 10, 1947.He flew the X-1 a total of 26 times, pushing it near the sound barrier.