At Richard Mille, the fact that a tremendous challenge has been won is never a valid reason to stand still and be complacent. The introduction of the RM 056 Sapphire Tourbillon Split Seconds Chronograph three years ago was a watchmaking milestone of technical achievement; never before had such a complex case design for such an intricate movement been manufactured in pure sapphire. This debut was followed by the RM 56-01, which put the stakes even higher with a baseplate, bridges and third wheel additionally created from sapphire.
Created expressly for the Watches & Wonders event in Hong Kong is presented with the magnificent RM 56-02 Sapphire Tourbillon and its new movement, taking cues from the mechanical architecture of the RM 27-01 Rafael Nadal and its cable suspended movement. By incorporating this cabled movement design within a world of transparent sapphire, an ultimate expression of weightlessness and transparency is evoked within the world of extreme horology.
Available in a limited edition of 10 examples worldwide
CALIBER RM56-02 Manual winding tourbillon movement with hours, minutes
TENSION INDICATOR Located below 12 o'clock, a separate indicator allows the visual inspection of the cable tension. A titanium lever with an indicator arrow ensures that one can visually control that the cable is operating within designated norms.
CABLE-SUSPENSION MECHANISM The baseplate of the RM 56-02 is attached to the case by a single braided steel cable, with a diameter of just 0.35 mm. The cable is held taut by a tensioners (located at 9 o’clock) and pulleys, which act like pylons positioned at the four corners of the movement. The cable is fixed just near the 3 o'clock position.
BARREL, TOURBILLON AND CENTER BRIDGES IN SAPPHIRE The tourbillon, barrel and center bridges are made from sapphire crystal. The rhomboid crystalline structure of synthetic sapphire crystal Al2O3 has a high melting point of 2,303 Kelvin and a linear-expansion minimal thermal coefficient (6 x 10-6), which combined offer exceptional stability even in the most extreme conditions. Its resistance to abrasion is also eight times greater than that of steel.
Circa 38 hours (±10%).
FREE SPRUNG BALANCE WITH VARIABLE INERTIA
A free sprung balance with variable inertia and a terminal-curve spring (originally designed for pocket watches) guarantees greater reliability in case of impacts and perfect centering of the tourbillon’s balance wheel, thus providing better chronometric results over time.
FAST ROTATING BARREL (6 hours per revolution instead of 7.5 hours)
This type of barrel has the following advantages: - The phenomenon of periodic internal mainspring adhesion is significantly diminished and performance is thus enhanced, - It provides an excellent delta of the mainspring curve with a power-reserve/performance/regularity ratio.
BARREL PAWL WITH PROGRESSIVE RECOIL
This device permits an appreciable winding gain (circa 20 %), especially during the start of winding. It also promotes the even distribution of the mainspring’s internal tension.
WINDING BARREL TEETH AND CENTRE-WHEEL PINION WITH CENTRAL INVOLUTE PROFILE
The central involute profile of the winding barrel teeth provides an optimal pressure angle of 20°, which promotes effective rotary motion and compensates for possible variations in the operation of the going train. This, in turn, ensures excellent torque transmission and a distinct improvement in performance.
In titanium, with a black galvanic treatment and index filled with an approved luminescent material.
FRONT AND BACK BEZELS
In sapphire (1,800 Vickers) with anti-glare coating (on both sides) Thickness: 2.50 mm
- Hand-polished beveling
- Hand-polished locking-sections
- Microblasted milled sections
- Lapped and polished contact points - Burnished pivots
- Wire-drawn and microblasted surfaces - Hand-polished beveling
- Drawn outer faces
- Ribbed centre bridges with opaque indentations, polished on both sides then treated with an anti-reflective coating
- Concave chamfering with a diamond tool
- Circular-decorated faces
- Gilding (before cutting the teeth)
- Minimal corrections to preserve the geometry of the wheels and their performance
50.50 x 42.70 x 16.75 mm