The P-6A which differed from the original P-6 in having ethylene glycol rather than water cooling. Eight P-6s were brought up to P-6A standard.

Самолёты на фотографии: Aircrafts on the photo: Curtiss P-6 / Model 35 - СШАUSA - 1927

One of the 10 P-6s completed

Самолёты на фотографии: Aircrafts on the photo: Curtiss P-6 / Model 35 - СШАUSA - 1927

The XP-17 was a P-1 Hawk airframe mated to a Wright Tornado air-cooled in-line engine and was intended primarily as a power plant test bed.

Самолёты на фотографии: Aircrafts on the photo: Curtiss P-6 / Model 35 - СШАUSA - 1927

The YP-20 (shown) was originally built as a P-11 and, after reconstruction, was eventually to become the XP-6E.

Самолёты на фотографии: Aircrafts on the photo: Curtiss P-6 / Model 35 - СШАUSA - 1927

The YP-20

Самолёты на фотографии: Aircrafts on the photo: Curtiss P-6 / Model 35 - СШАUSA - 1927

The P-6A which differed from the original P-6 in having ethylene glycol rather than water cooling. Eight P-6s were brought up to P-6A standard.

Самолёты на фотографии: Aircrafts on the photo: Curtiss P-6 / Model 35 - СШАUSA - 1927

The P-6S, also known as the Cuban Hawk, was an export derivative of the Conqueror-powered P-6, three being built.

Самолёты на фотографии: Aircrafts on the photo: Curtiss P-6 / Model 35 - СШАUSA - 1927

The XP-10 bore no relationship to members of the Hawk family, other than a common design origin, and placed emphasis on aerodynamic cleanliness

Самолёты на фотографии: Aircrafts on the photo: Curtiss XP-10 - СШАUSA - 1930

The XP-10 bore no relationship to members of the Hawk family, other than a common design origin, and placed emphasis on aerodynamic cleanliness

Самолёты на фотографии: Aircrafts on the photo: Curtiss XP-10 - СШАUSA - 1930