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Ellehammer helicopter

Experimental Danish aircraft, 1912

Field	Value
name	"Helicopter"
image	Ellehammer 1914.jpg
caption	1914 photo of Ellehammer's coaxial helicopter hovering
aircraft_type	Experimental helicopter
manufacturer	Jacob Ellehammer
designer	Jacob Ellehammer
number_built	1
first_flight	28 September [1912](1912-in-aviation)

NOTOC

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 with six vanes around its circumference. The pitch of these vanes could be varied in operation by the pilot, an early example of cyclic control. The same engine that drove the rotors also powered a propeller mounted tractor-wise to the aircraft's frame.

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.

Specifications

|prime units? = met

References

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

1910s-danish-experimental-aircraft ellehammer-aircraft 1910s-danish-helicopters coaxial-rotor-helicopters single-engined-piston-helicopters aircraft-first-flown-in-1912

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