Dutchman Fritz Koolhoven came to Britain at the same time as his compatriot Anton Fokker in 1914 to work for the British Air Ministry, with the notable difference that he stayed whilst Fokker went off to help the Bosch.
The FK3 was built as replacement for the remarkbly durable but dated BE2c. An easy plane to fly many were used as trainers although at least one squadron used them as bombers as late as 1918, even if this meant loading the plane with 112lb of bombs and leaving the observer at home.