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The NVI F.K.33 was an airliner built in the Netherlands in 1925 for use by KLM for night flying.


Design and development

The F.K.33 was a largely conventional high-wing, strut-braced monoplane with seating for ten passengers in an enclosed cabin. A trimotor design, the placement of its engines was unusual. While two engines were mounted among the struts that braced the wings and the main units of the undercarriage, the third engine was mounted pusher-fashion on a set of struts above the wing. The engine installation was further unorthodox in that none of the three engines were enclosed in nacelles, remaining instead fully exposed.


Operational history

KLM successfully operated the type for two years on its
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route, but doing an increasing amount of business with
Fokker Fokker was a Dutch aircraft manufacturer named after its founder, Anthony Fokker. The company operated under several different names. It was founded in 1912 in Berlin, Germany, and became famous for its fighter aircraft in World War I. In 191 ...
, did not purchase further aircraft from NVI. The F.K.33 was eventually sold to German airline
Aero Aero is a Greek prefix relating to flight and air. In British English, it is used as an adjective related to flight (e.g., as a shortened substitute for aeroplane). Aero, Ærø, or Aeros may refer to: Aeronautics Airlines and companies * Aero (P ...
, but after two accidents within months of purchasing it, they returned it claiming poor workmanship. It was sold again in 1928, to Baumer-Aero, who replaced the Armstrong-Siddeley engines with
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s and the boarding lights with loudspeakers. In this configuration, it was flown as an advertising machine until 1931. The F.K.33 ended its days requisitioned by the
Luftwaffe The ''Luftwaffe'' () was the aerial-warfare branch of the German '' Wehrmacht'' before and during World War II. Germany's military air arms during World War I, the '' Luftstreitkräfte'' of the Imperial Army and the '' Marine-Fliegerabt ...
in 1939 as an instructional airframe.


Specifications


References

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Koolhoven Aeroplanes Foundation


{{Koolhoven aircraft F.K.33 1920s Dutch airliners Three-engined push-pull aircraft High-wing aircraft Aircraft first flown in 1925