Ellehammer helicopter

__NOTOC__ Infobox Aircraft
name="Helicopter"


caption=
type=Experimental helicopter
manufacturer=Jacob Ellehammer
designer=Jacob Ellehammer
first flight=28 September 1912
introduced=
retired=
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number built=1
variants with their own articles=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.

After a number of indoor tests, the aircraft was demonstrated outdoors and made a number of free take-offs. One of these trials was witnessed by Prince Axel of Denmark. Experiments with the helicopter continued until September 1916, when it tipped over during take-off, destroying its rotors.

pecifications

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crew=One pilot
capacity=
length m=
length ft=
length in=
span m=
span ft=
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swept m=
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rot number= 2
rot dia m= 7.47
rot dia ft= 24
rot dia in= 7
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width ft=
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wing area sqft=
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rot area sqm= 12.0
rot area sqft= 130
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eng1 number=1
eng1 type=Custom-built radial engine
eng1 kw= 27
eng1 hp= 36
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References

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