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Jacob Ellehammer

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Nationality  Danish
Role  Inventor

Name  Jacob Ellehammer
Education  Watchmaker, mechanic
Engineering discipline  Aviation
Jacob Ellehammer The Pioneers An Anthology Jacob Christian Hansen
Born  June 14, 1871Bakkebolle
Died  May 20, 1946, Copenhagen, Denmark
Parents  Mads Jacob Hansen, Maren Katrine Larsen Ellehammer

Significant design  Ellehammer semi-biplane

Jacob ellehammer


Jacob Christian Hansen Ellehammer (June 14, 1871 – May 20, 1946) was a Danish watchmaker and inventor born in Bakkebølle, Denmark. He is remembered chiefly for his contributions to powered flight.

Jacob Ellehammer The Pioneers An Anthology Jacob Christian Hansen

Following the end of his apprenticeship as a watchmaker he moved to Copenhagen where he worked as an electronics mechanic before establishing his own company in 1898. In the beginning he produced cigarette machines, beverage machines and other electronic machinery. In 1904 he produced his first motorcycle, the Elleham motorcycle.

Jacob Ellehammer httpsuploadwikimediaorgwikipediacommons22

In 1903–1904 Jacob Ellehammer used his experience constructing motorcycles to build the world's first air-cooled radial engine, a three-cylinder engine which he used as the basis for a more powerful five-cylinder model in 1907. This was installed in his triplane and made a number of short free-flight hops as mentioned below.

Jacob Ellehammer Ellehammer39s Dragons HistoricWingscom A Magazine for

In 1905, he constructed a monoplane, and in the following year a "semi-biplane". In this latter machine, he made a tethered flight on 12 September 1906.

Jacob Ellehammer Ellehammer39s Dragons HistoricWingscom A Magazine for

Ellehammer's later inventions included a successful triplane and helicopter. His helicopter was a coaxial machine. A famous photo shows it hovering in 1914, though there is no evidence that it was successful in achieving translational flight. Ellehammer later studied a disc-rotor configuration - a compound helicopter with coaxial blades that extended from the hub for hover, and retracted for high speed vertical flight. Although a wind tunnel model was constructed, there's no evidence that anything more was studied.

References

Jacob Ellehammer Wikipedia


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