Curtiss P-1 Hawk

The Curtiss P-1 Hawk, the Curtiss Model 34, was an open-cockpit biplane fighter of the United States Army Air Corps in the 1920s and the first Army aircraft given the P for pursuit designation, which replaced seven earlier pursuit designations. It was the production version of the XPW-8B, an improved PW-8 whose wings were modified to resemble those of the Boeing PW-9 after the Air Service chose the Boeing as its main fighter. The PW-8 itself had grown from the R-6 racer, with surface radiators on the wings. The first production P-1 was delivered on 17 August 1925, later P-1B and P-1C versions had improved engines, and the newest remained in operational service until 1930.