Double Tourbillon TechniqueEach and every element of the mechanism is enhanced and displayed without overshadowing others.
At the heart of the timepiece is the Double Tourbillon 30° mechanism; however, to perpetuate the art of horology and contribute to its 21st century development, several additional technical elements have been added, including four fast-rotating co-axial barrels guaranteeing 120 hours of autonomy. Admirers can even enjoy the sight of the barrels rotating while winding and unwinding.
Coupled to these barrels is the visible spherical differential that drives the power reserve indicator. The hours are displayed on a transparent sapphire crystal ring fitted inside the inner circumference of the bezel to ensure full visual access to the astonishingly three-dimensional depth of the mechanism.
Transparency is also reflected in the luminous open-worked signature Greubel Forsey hands and both the power reserve indicator at 3 o’clock and sub-seconds dial at 9 o’clock are strikingly enhanced by their red triangular pointers.
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127,1 KBInvention Piece 3In a league of its own, Invention Piece 3 shows the time on a large 24-hour display taking up most of the space on the dial side. The minute display is concentric to the hour dial, with the hours distinguished by a red indicator and the minutes by a blue one.
The power reserve, offset at 2 o’clock, is visually balanced by the tourbillon at 8 o’clock and provides linear reading of the indications. A sub-seconds dial at 5 o’clock ensures the overall equilibrium of the timepiece.
Turning the watch over, the tourbillon, supported by a distinctive arrow-shaped bridge, provides an aesthetical link between the front and back of the watch and it can also be admired via the lateral convex sapphire crystal on the side of the case.
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107,03 KBTourbillon 24 SecondesFor their third fundamental Invention, they chose to use the unexplored possibilities of the rotating cage, opting for the high rotation speed of a uniquely inclined cage capable of performing a complete rotation in 24 seconds.
This high velocity combined with a 25-degree inclination of the cage enables the Tourbillon 24 Secondes Incliné to offer an innovative solution to the flaw in equilibrium by keeping the regulating mechanism’s exposure to the critical position to an absolute minimum – meaning that the balance and its spring are placed parallel to the earth’s surface.
One of the major problems caused by the cage’s high rotation velocity is the sheer inertia of the system, a high quantity of mechanical energy is required to start the cage, which advances in steps that are two and a half times greater than in conventional Tourbillon systems.
Complex research was undertaken in order to reduce the weight of the mobile components to a minimum, and extremely low-density alloys already widely deployed in the aeronautical and aerospace industries were used. Materials such as Avional and titanium, which have specific weights two to three times lower than that of steel, are perfectly suited to extreme use and made it possible to create a complete 88-part Tourbillon system weighing only 0.39 grams.
Another cutting-edge innovation incorporated within the Tourbillon 24 Secondes Incliné is a specially constructed inclined gear profile, optimising efficiency within the relatively small space of the mechanism.
It ensures ideal meshing of the moving parts while eliminating any risk of binding. This array of improvisations has led to a significant increase in the performance of a single Tourbillon
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