The Fokker V.6 was a prototype fighter triplane developed in Germany during World War I in parallel with the V.5, from which the famous Dr.I was developed.
The V.6 was powered by an 89 kW (120 hp) Mercedes D.II liquid-cooled engine.
The heavier engine required larger wings, with the lower wing being placed just below the fuselage.
A modification to add fairings to the lower wing fuselage junction was implemented after the first tests.
[1] The V.6 was abandoned in October 1917 due to being inferior in maneuverability to the newer Dr.I.