The Fo 145 Gnat, the example illustrated being one of the Folland-built batch for the IAF.

The Mercury-engined production model of the G I ordered by the Dutch Army in October 1937.

The unusual D XXIII of centreline-thrust concept

Friedrichshafen FF 43 предназначался для обороны немецких баз гидросамолетов на побережье Северного моря, но был построен в единственном экземпляре.
The FF 43 float fighter evaluated under operational conditions in the North Sea during the last quarter of 1916.

Based on the FF43, the FF46 nevertheless possessed no commonality with its predecessor. Only prototypes were built.