Why do helicopters don´t use optional detachable wings to increase range?

[oriol]

Hi all!



I just happen to learn how the old MIL MI 6 improved his speed performances (I guess it also improved its available range, fuel consumption...) by fitting optionally some wings.




Apparently the helicoptered was so heavy that the engineers decided to put some wings to bear part of the lift away from the rotor.


Mil Mi-6 - Wikipedia, the free encyclopedia
Empty weight: 27,240 kg (60,055 lb)
Max take off weight: 42,500 kg (93,700 lb)
Max speed: 300 km/h (162 kt)
Cruise 250Km/h (135 KN)


Since the Mil MI 6 no other helicopter has used fixed/detachable wings to increase its performances.
Why?

Does the interaction of the rotor wake reduces significantly the lift generated by the wing?
If so why did it worked fine with the Mil MI 6?



Many thanks for your interesting answers!



Oriol

 

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