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The story
Founded by Frederick Koolhoven in 1926.1
In 1920, aircraft designer Frederick "Frits" Koolhoven returned from England to his native Netherlands. The postwar years had not been good to him; the British Aerial Transport Company for which he was chief designer went bankrupt and all other manufacturers were struggling for survival too hard to think of hiring. The Netherlands, Koolhoven hoped, would be better. But there he found that while the Netherlands' new airline KLM was a willing taker for all the aircraft it could get, the market was almost completely dominated by Fokker. Out of other options, Koolhoven returned to his old job and worked as an automobile engineer for the Spyker automobile factory.
In 1921, his luck began to change when a group of businessmen founded the N.V. Nationale Vliegtuig Industrie ("National Aircraft Industry, Incorporated") and hired him as their chief designer. The time was still not yet ripe for a second Dutch aircraft manufacturer and, as with BAT, N.V.I. produced technically advanced designs that attracted attention from all over the world, but received virtually no orders. The company lasted only four years.
At the demise of N.V.I. Koolhoven had become sufficiently business-aware to convince several of the N.V.I. shareholders that the company would still be viable, if only he would have complete control of the operations. Enough of the shareholders agreed and even while N.V.I. was being dissolved, its assets were almost immediately taken over by a new company: N.V. Koolhoven vliegtuigen (Koolhoven aircraft, Inc.).
For its first five years, 1925 to 1930, the company managed to stay afloat by making one-off purpose-built airplanes to order, slowly branching out into the private aircraft sector and trying to break into the military market. In 1930, the company finally struck gold with the FK-41 high-wing tourist monoplane. Although N.V. Koolhoven itself only built 7 FK-41's the airplane was built under licence in England as the Desoutter Mk.I and later improved as the Mk.II.
By 1933 the military market had picked up and Koolhoven increasingly built trainers and observation aircraft for the Dutch air force as well as several other countries. By 1938, with war looming, the company's order books continued to fill as air forces from all over Europe were virtually fighting over each plane that rolled off the production line. Even France found itself buying Koolhoven FK-58 fighters as its own aircraft industry was unable to keep up with the demand from the Armée de l'Air.
In 1938, the Koolhoven factory at Waalhaven covered 8,000 square meters and had 1,200 employees. While still no match for Fokker, Koolhoven had established itself firmly as the number two manufacturer in the Netherlands.
The end came on 10 May 1940. As a prelude to the German invasion of the Netherlands, the Luftwaffe set out to destroy as much as possible of the Dutch Air Force on the ground. On the morning of that day, a massive armada of German bombers appeared over Waalhaven and almost completely destroyed the airfield and its surrounding facilities. This included the Koolhoven factory and within a few hours, the company had been reduced to a pile of rubble and all drawings, models, and documentation of Koolhoven's projects were destroyed. Today, the only photographs remaining of Koolhoven's planes are newspaper clippings and private snapshots.
Frederick Koolhoven died of a stroke on 1 July 1946. His company, although without means of production, continued to exist as a holding. Over the next ten years various attempts were made to start up new projects, but apart from the construction of two prototype sailplanes nothing happened and in 1956 N.V. Koolhoven Aeroplanes closed and was liquidated.
From Wikipedia’s article on Koolhoven, shared under CC BY-SA 4.0.3