page_title: Curtiss P-1 Hawk
section_title: P-1
hierarchical_section_title: Curtiss P-1 Hawk / Design and development / P-1
caption_attribution_description: English: Curtiss P-2 Hawk side view with the original turbo-supercharger. Alternate designation was XP-431. (U.S. Air Force photo)
context_page_description: The P-1 Hawk was a 1920s open-cockpit biplane fighter aircraft of the United States Army Air Corps. An earlier variant of the same aircraft had been designated PW-8 prior to 1925.
context_section_description: The prototype of the P-1, the XPW-8B, came about when the Air Service, which had selected the Boeing PW-9 over the PW-8 as its main production fighter, asked Curtiss to modify the last of its three original XPW-8 prototypes with wings resembling those of the PW-9. Curtiss designated the modified aircraft its Model 34A and returned it to the Air Service for evaluation, from which the service ordered it into production as the P-1. The first production P-1, serial number 25-410, was delivered on August 17, 1925, and was followed in successive years by the P-1B and P-1C variants with improved engines. The newest P-1 variants remained in operational service until 1930.
  The March 7, 1925 order for the P-1 also requested five aircraft with the more powerful 500 hp (373 kW) Curtiss V-1400 engine installed. These were completed in January 1926. The first (SN 25-420) was then modified with a turbocharger mounted on the right side of the fuselage nose, and whose turbine was driven by engine exhaust; the craft was designated XP-2.
  However, the Curtiss V-1400 engine did not perform up to expectations, with or without the supercharger, and so after a year in service, three of the standard P-2 Hawks had their engines replaced with the Curtiss D-12 and were consequently redesignated as P-1s. The fifth machine (25-243) received a Curtiss V-1570 Conqueror engine and became the XP-6.
  93 production P-1s were brought into service in the P-1, P-1A, P-1B, and P-1C variants. 52 other P-1s, variants P-1D, P-1E, and P-1F, were made by conversion of other Hawk variants, primarily AT-4 and AT-5 trainers.
caption: P-2 Hawk
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