An auxiliary door for passengers and light cargo was included on the right side of the center fuselage.

The C-1 biplane was powered by the Liberty L-12 engine and carried a crew of two in an open cockpit.

[2] Seventeen additional aircraft were ordered in 1926 and 1927 for the United States Army Air Corps as C-1Cs and were slightly larger than the original C-1s.

Two of these aircraft were used as "tankers" in the 1929 record endurance flight of the Fokker C-2 Question Mark.

Data from McDonnell Douglas aircraft since 1920 : Volume I[3]General characteristics Performance