Финские ВВС эксплуатировали два FK 52 во время советско-финской войны.
One of the two F.K.52 two-seat fig ers presented to the Finnish Air Force.

Самолёты на фотографии: Aircrafts on the photo: Koolhoven FK-52 - НидерландыNetherlands - 1937

A general arrangement drawing of the F.K.52 showing more than a passing resemblance to the Gloster Gladiator.

Самолёты на фотографии: Aircrafts on the photo: Koolhoven FK-52 - НидерландыNetherlands - 1937

The Koolhoven F.K.55 photographed prior to its single flight test.
Flown only once briefly, the F.K.55 was of extremely radical design, with engine mounted over the CG and contra-rotating propellers.

Самолёты на фотографии: Aircrafts on the photo: Koolhoven FK-55 - НидерландыNetherlands - 1938

The series F.K.31 as produced for (and in) Finland.

Самолёты на фотографии: Aircrafts on the photo: Koolhoven FK-31 - НидерландыNetherlands - 1922

The Kondor D 6

Самолёты на фотографии: Aircrafts on the photo: Kondor D.1 / D.2 / D.6 - ГерманияGermany - 1918

The Kondor D 7 which was essentially a biplane rework of the Kondor triplane fighter.

Самолёты на фотографии: Aircrafts on the photo: Kondor D.7 - ГерманияGermany - 1918

The Kondor E 3a fitted with the Goebel Goe III engine.

Самолёты на фотографии: Aircrafts on the photo: Kondor E.3 / D.I - ГерманияGermany - 1918

The Ur II-powered E 3, a small number of examples being completed under the official designation D I.

Самолёты на фотографии: Aircrafts on the photo: Kondor E.3 / D.I - ГерманияGermany - 1918