[1] The smallest of designs from Frederick Koolhoven when he worked for the British Aerial Transport Company was the F.K.28 Crow.

It was very small and light high-wing monoplane, with a conventional tractor configuration.

An ABC Gnat 2-cylinder horizontally-opposed engine - together with fuel and oil tanks - was mounted on the wing centre section.

The pilot's seat was set between the landing gear suspended below the wing.

It was displayed at the First Air Traffic Exhibition in Amsterdam, but it did not fly until some time later.