The Heinkel He 1 was a two seat, low-wing monoplane

Monoplane

A monoplane is a fixed-wing aircraft with one main set of wing surfaces, in contrast to a biplane or triplane. Since the late 1930s it has been the most common form for a fixed wing aircraft.-Types of monoplane:...

 floatplane

Floatplane

A floatplane is a type of seaplane, with slender pontoons mounted under the fuselage; only the floats of a floatplane normally come into contact with water, with the fuselage remaining above water...

, designed in 1921 by German

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

 designer Ernst Heinkel

Ernst Heinkel

Dr. Ernst Heinkel was a German aircraft designer, manufacturer, Wehrwirtschaftführer in the Third Reich, and member of the Nazi party. His company Heinkel Flugzeugwerke produced the Heinkel He 178, the world's first turbojet aircraft and jet plane, and the Heinkel He 176, the first rocket aircraft...

 at Caspar-Werke

Caspar-Werke

The Caspar-Werke was a German aircraft manufacturer of the early 20th century. It was founded in 1911 by Karl Caspar under the name Zentrale für Aviatik in Fuhlsbüttel. In its early years, the firm built Etrich and Rumpler types under licence, and was dissolved following World War I.In 1921, Caspar...

. The aircraft was initially produced under licence in Sweden

Sweden

Sweden , officially the Kingdom of Sweden , is a Nordic country on the Scandinavian Peninsula in Northern Europe. Sweden borders with Norway and Finland and is connected to Denmark by a bridge-tunnel across the Öresund....

 for the Navy of 1921. The HE 1 was powered by a 179 kw Maybach Mb.IVa

Maybach Mb.IVa

-Further reading:* Germany's giant aircraft of WWI the R-Planes...

 engine; one test aircraft was powered by a Siddeley Puma engine.

In 1926, an all-metal version was flown as the He 4 (Swedish designation S 4). It was tested extensively, but no further examples were built.