Wiki information Ellehammer:

Jacob Ellehammer
Inventor, Deceased Person, Person

Jacob Christian Hansen Ellehammer was a Danish watchmaker and inventor born in Bakkebølle, Denmark. He is remembered chiefly for his contributions to powered flight. Following the end of his apprenticeship as a watchmaker he moved to Copenhagen where...

Ellehammer helicopter
Aircraft model

The Ellehammer helicopter was an otherwise-unnamed experimental aircraft built in Denmark in 1912. Based on experiments with models, Jacob Ellehammer constructed a full-size machine equipped with two contra-rotating discs, each of which was fitted...