Evolved from the P.1 by Zygmunt Pulawski and developed in parallel with the P.7, the P.6 was powered by a low-altitude Gnome-Rhone Jupiter 9Ac (VI.FH) nine-cylinder radial rated at 450hp. The principal change from the P.1, apart from the power plant, was to be found in the fuselage structure and fuel disposition, the rear fuselage being a semi-monocoque and the wing tanks of the earlier fighter giving place to a jettisonable fuselage tank. Armament remained two Vickers "E" machine guns (rebored to 7.92mm calibre). The first of two P.6 prototypes was flown in August 1930, and, in the following year, participated in the National Air Races at Cleveland, Ohio. The second prototype, the P.6/II, differed primarily in having a Townend ring cowling in place of the narrow ring of the P.6/I. The Lotnictwo Wojskowe elected to order the contemporary P.7 for series production and no further development of the P.6 was undertaken.