Koolhoven F.K.58

The Koolhoven F.K.58 was a single engine, interceptor-fighter aircraft designed and mainly manufactured by N V Koolhoven in the Netherlands under contract by France. Intended for Armée de l’Air use, the F.K.58 saw limited service in the Battle of France.

The F.K.58 was originally ordered to serve with Armée de l’Air units based in French overseas territories. Following the outbreak of war with Germany, however, the type was assigned to an ad hoc, Free Polish air force unit.

By May 1940, 13 aircraft were operational with Eskadra Koolhoven. As delivered, however, the fighters were unarmed and the Poles had to acquire machine guns and fit them. From 30 May 1940, they were in service, patrolling firstly in the Avignon-Marseille area, and then over Clermont-Ferrand. At least 47 operational sorties were recorded, but the Escadron did not encounter enemy aircraft.

The type’s service life was short-lived, the unit had no confirmed victories, but at least one F.K.58 was lost. After the fall of France, all surviving airframes were scrapped.