Screen Shot 2018-04-05 at 11.17.11 Published on April 5, 2018 in 6 April 1939Full resolution (1439 × 1054) ← Previous Next → Bell XP-39 Airacobra 38-326 in the NACA full-scale wind tunnel, Langley Field, Virginia, 9 August 1939. The fuselage has had all protrusions removed. (NASA)