Bowers, P. M. Curtiss Aircraft 1907-1947, Putnam Aeronautical Books, London 1979. ISBN 0-370-10029-8. Bowers, P. M. Curtiss Army Hawks, Aircraft in Profile No.45. Profile Publications, Leatherhead 1965. United States Army and Air Force Fighters 1916-1961, Harleyford Publications, Letchworth 1961. Fahey, James C. U.S. Army Aircraft 1908-1946. Ships and Aircraft, Falls Church, 1964. Bowers, P. M. Forgotten Fighters/2 and Experimental Aircraft U.S. Army 1918-1941, Arco Publishing Company, New York 1971. ISBN 0-66802-403-8. http://home.att.net/~jbaugher1/p1.html www.nationalmuseum.af.mil http://www.aerofiles.com/_curt.html www.americancombatplanes.com
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7. may 1925 commissioned the u.s. army air force 15 machines derived from the prototype XPW-8B. Differed only in the details, had the articulation of a balanced rudder and a bit of modified struts. The power unit was now Curtiss D-12C, in the new army system, renamed the V-1150-1 (In - two-row, 1150 - volume of cylinder in cubic inches, 1. version), dragon but allow for installation of larger 353kW engine Curtiss V-1400. The novelty was also an option under the hull podvěsit 55galonovou auxiliary tank.
The first P-1 was the army passed in August 1925 and was used mainly for further development of the McCook Field. For a short time he got inverted air-cooled engine of Liberty and in September 1926se in Philadelphia participated in National air races, where he finished eighth. Then it was again rebuilt, got another invert motor, the Wright V-1460, and was renamed XP-17. The other nine P-1 (which were by the way the first machine, which received the name of the Hawk) was assigned to 27. and 94. fighter squadronSelfridge-Field, where it flew for another 5 years.
The last five machines received the already mentioned engines, Curtiss V-1400, and were considered so different that they got a new label, P-2..
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