Douglas B-18 Bolo: In the spring of 1941 Langley installed an experimental low-drag laminar flow test panel on the wing of a Douglas B-18 bomber. Here, November 1941, the same B-18 was used to test an airfoil (NACA 0012) which was mounted just forward of the vertical stabilizer. The purpose of this test was to conduct boundary-layer and profile-drag tests in which Reynolds Number and angle of attack were varied independently.
