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Koolhoven's airplanes
1926-1940, N.V. Koolhoven Vliegtuigen

Koolhoven F.K.30 'Toerist'
Private plane with rotating wing for transport, 1927

Koolhoven F.K.35
Mono/biplane scout and fighter, 1926

Koolhoven F.K.36
Biplane fighter, enlarged version of the F.K.35, 1926

Koolhoven F.K.37
Three engined airliner, design for KLM (not built), 1927

Koolhoven F.K.39
Several design studies (not built), 1927

Koolhoven F.K.40
Airliner for 4 or 5 passengers, 1928

Koolhoven F.K.41
High winged sportscoupe, 1928

Koolhoven F.K.42
Private plane, 1929

Koolhoven F.K.43
Aircraft for three passengers, 1930

Koolhoven F.K.44 'Koolmees'
Private plane, 1931

Koolhoven F.K.45
Aerobatic plane, 1931

Koolhoven F.K.46
Trainer, 1930

Koolhoven F.K.47
Private plane and trainer, 1933

Koolhoven F.K.48
Airliner for six passengers, 1934

Koolhoven F.K.49
Photo- and cartography aircraft, 1935

Koolhoven F.K.49A
Multi purpose aircraft, 1937

Koolhoven F.K.50
Airliner for ten passengers, 1935

Koolhoven F.K.51
Military trainer, 1935

Koolhoven F.K.52
Scout and fighter, 1936

Koolhoven F.K.53 'Junior'
Light private plane with side by side seats, 1936

Koolhoven F.K.54
Executive plane, first Koolhoven with retractable gear, 1937

Koolhoven F.K.55
High performance fighter with many innovations, 1936

Koolhoven F.K.56
Military advanced trainer, 1937

Koolhoven F.K.57
Executive plane, 1938

Koolhoven F.K.58
High performance fighter, 1938
Koolhoven F.K.59 (no photograph available)
Military multi purpose aircraft, 1938
The type number F.K.59 has been used for three Koolhoven designs: a two-engined float plane, an open two-seat sports plane and a single engined military biplane developed from the F.K.52. Of these three aircraft it was the single engined biplane that made it to production as Koolhoven F.K.59. It was the last Koolhoven design in production.
Other sources mostly show a photo of the two-engined float plane as F.K.59, but this was just a mock-up, not an actual aircraft, neither a prototype.
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