Aircraft

1. A helicopter comprising:

a fuselage; and

a detecting device for detecting the presence of ice caused by solidification of first supercooled liquid droplets having a characteristic first dimension above a threshold value; said detecting device comprising a first portion for accumulating said first droplets;

said first portion being located so as to be visible from inside said fuselage;

said detecting device comprising a second portion for accumulating second supercooled liquid droplets having a characteristic second dimension below said threshold value;

said second portion being visually distinct from said first portion and located so as to be visible from inside the fuselage;

said detecting device further comprising a body in turn comprising a surface swept by said first droplets and said second droplets;

said surface of said body defining said first and said second portion;

said second portion being located to the front of said first portion in the normal travelling direction of said helicopter;

wherein said first portion is bounded between a first and second closed curve lying respectively in a first and second plane distinct from each other; and in that said second portion is bounded, on the side facing said first portion, by a third closed curve lying in a third plane distinct from said first and second plane;

said body being spherical and being fixedly attached to said fuselage so that the body does not move relative to said fuselage;

said surface comprising at least a spherical portion defining said first and second portion;

said first, second, and third closed curves being respectively a first, a second, and a third circle having respective centers along a common first axis;

said helicopter further comprising a support projecting from said fuselage and supporting said body at the opposite end to said fuselage;

said support being fixedly attached to said fuselage so that the support does not move relative to said fuselage, the support comprising:

a flange bolted to one side of said fuselage such that the flange does not move relative to said fuselage; and

an arm connected to said flange and supporting said body;

wherein said body has a second axis of symmetry parallel to said normal travelling direction of the helicopter; and

wherein said first and second axis are inclined with respect to each other.

2. A helicopter as claimed in claim 1 , wherein said detecting device comprises a third portion defined by said surface and defining a portion for accumulating third supercooled liquid droplets having a characteristic third dimension between said first and second dimension;

said third portion being interposed between said first and second portion.

3. A helicopter as claimed in claim 2 , wherein said body has a second axis of symmetry parallel to said normal travelling direction of the helicopter; and wherein said first and second axis are inclined with respect to each other.

4. A helicopter as claimed in claim 1 , wherein said surface defines also said third portion.

5. A helicopter as claimed in claim 4 , wherein said body has a second axis of symmetry parallel to said normal travelling direction of the helicopter; and wherein said first and second axis are inclined with respect to each other.

6. A helicopter as claimed in claim 1 , wherein said detecting device comprises means for heating said body.

7. A helicopter as claimed in claim 6 , wherein said body is made of metal.

8. A helicopter as claimed in claim 7 , wherein said body has a second axis of symmetry parallel to said normal travelling direction of the helicopter; and wherein said first and second axis are inclined with respect to each other.

9. A helicopter as claimed in claim 6 , wherein said body has a second axis of symmetry parallel to said normal travelling direction of the helicopter; and wherein said first and second axis are inclined with respect to each other.

10. A helicopter as claimed in claim 1 , wherein said body is made of composite material.

11. A helicopter as claimed in claim 10 , wherein said body has a second axis of symmetry parallel to said normal travelling direction of the helicopter; and wherein said first and second axis are inclined with respect to each other.

12. A helicopter as claimed in claim 1 , wherein said body has a second axis of symmetry parallel to said normal travelling direction of the helicopter; and wherein said first and second axis are inclined with respect to each other.