RM 50-02 ACJ
RM 50-02 ACJ
RM 50-02 ACJ

RM 50-02 ACJ

TOURBILLON

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SYNERGETIC APPROACH

The world of aviation has always played an integral and inspirational role for Richard Mille due to the myriad of parallels with his own philosophy of 21st century watchmaking, combining horological tradition with new materials in the realisation of horological masterpieces. It was only natural that Richard Mile and ACJ would join together to create the RM 50-02 ACJ Tourbillon. Limited edition of 30 pieces, only available in the Richard Mille boutiques.

Main characteristics

The end result is a visually breathtaking and dramatic view of the technical interior of the split seconds chronograph movement which also technical repercussions such as the elimination of the initial jump of the chronograph seconds hand during starting and stopping, with new split seconds components also in titanium additionally lowering the chronograph’s energy consumption through the reduction of internal friction.

01
CALIBER RM50-02: manual winding tourbillon movement with hours, minutes, split-seconds chronograph with running seconds, 60-minute totaliser and power reserve, torque and function indicators.

BARREL PAWL WITH PROGRESSIVE RECOIL This device permits an appreciable winding gain (circa 20 %), especially during the start of winding. It also aids in the even distribution of the mainspring’s internal tension.

02
CALIBER RM50-02: manual winding tourbillon movement with hours, minutes, split-seconds chronograph with running seconds, 60-minute totaliser and power reserve, torque and function indicators.

TORQUE INDICATOR This indicator supplies information about the mainspring’s tension, thus permitting the optimisation of the chronometric functioning of the movement. Below 53 dNmm, the spring is considered to be too slack, while above 65 dmmm, the excessive spring tension can adversely affect the mechanism’s operation, or else actually endanger it.

03
CALIBER RM50-02: manual winding tourbillon movement with hours, minutes, split-seconds chronograph with running seconds, 60-minute totaliser and power reserve, torque and function indicators.

TORQUE LIMITING CROWN This added security system prevents accidental over-winding of the watch, the result of which can cause possible damage to the winding stem or the application of extreme pressure on the barrel spring.

04
CALIBER RM50-02: manual winding tourbillon movement with hours, minutes, split-seconds chronograph with running seconds, 60-minute totaliser and power reserve, torque and function indicators.

CALIBER RM50-02: manual winding tourbillon movement with hours, minutes, split-seconds chronograph with running seconds, 60-minute totaliser and power reserve, torque and function indicators.

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Approximate scale 1 : 1

Main characteristics

The end result is a visually breathtaking and dramatic view of the technical interior of the split seconds chronograph movement which also technical repercussions such as the elimination of the initial jump of the chronograph seconds hand during starting and stopping, with new split seconds components also in titanium additionally lowering the chronograph’s energy consumption through the reduction of internal friction.

CASE IN TITANIUM-ALUMINUM

The case of the RM 50-02 is made in Titanium-Aluminum (TiAl). This intermetallic alloy has characteristics that stand between metals and ceramics, with physical properties characteristic of a metal with mechanical properties resembling ceramic. It exhibits an extreme rigidity and is much lighter than classical titanium alloys. This Titanium-Aluminum is the same alloy as that used in the Airbus for its jet turbine blades, which must function safely under the convergence of high temperatures and high fields of pressure, thus requiring a very strong and highly stress resistant material.

CASE IN TITANIUM-ALUMINUM

The case of the RM 50-02 is made in Titanium-Aluminum (TiAl). This intermetallic alloy has characteristics that stand between metals and ceramics, with physical properties characteristic of a metal with mechanical properties resembling ceramic. It exhibits an extreme rigidity and is much lighter than classical titanium alloys. This Titanium-Aluminum is the same alloy as that used in the Airbus for its jet turbine blades, which must function safely under the convergence of high temperatures and high fields of pressure, thus requiring a very strong and highly stress resistant material.

TORQ SET® SCREWS FOR THE CASE

Torq-set® screws utilise a waved slot pattern where each arm of the slot is also offset from its neighbor. These types of screws are used in aerospace applications where the applied torque must be exactingly executed, and for the security they offer against tampering. This configuration provides greater strength within the screw than a cruciform design, with an excellent transfer of torque. The shape also insures perfect interlocking of driver and bit providing fast removal even if the screw has corroded, seized or frozen.

BEZEL

In Titanium-Aluminum created with second bezel in ATZ white ceramic. This high quality ceramic is based on aluminum oxide powder injected at a pressure of 2,000 bar. This high-pressure injection increases rigidity by 20-30% and reduces the material's porosity to an absolute minimum. ATZ has the reputation of being a particularly scratch-resistant material (1,400 Vickers), and possessing an unchangeable color. After diamond, it is one of the hardest materials in the world. A long and difficult machining process using diamond tools is necessary to create the complex form of this bezel, which is given a final matt surface finish. These qualities make it the ideal material for the front of the watch, an area highly exposed to impact and abrasion.

BEZEL

In Titanium-Aluminum created with second bezel in ATZ white ceramic. This high quality ceramic is based on aluminum oxide powder injected at a pressure of 2,000 bar. This high-pressure injection increases rigidity by 20-30% and reduces the material's porosity to an absolute minimum. ATZ has the reputation of being a particularly scratch-resistant material (1,400 Vickers), and possessing an unchangeable color. After diamond, it is one of the hardest materials in the world. A long and difficult machining process using diamond tools is necessary to create the complex form of this bezel, which is given a final matt surface finish. These qualities make it the ideal material for the front of the watch, an area highly exposed to impact and abrasion.

SPLIT SECONDS MECHANISM WITH IMPROVED PERFORMANCE

One of the new characteristics developed for the split seconds tourbillon RM 50-02 is the virtually complete elimination of initial jumping in the chronograph seconds hand. Moreover, the development of a new generation of split seconds components meant that energy consumption of this function could be lowered by approximately 50 % through the reduction of friction within the movement, and the elimination of the inertial jumping of the chronograph’s hands during stopping and starting. This was achieved by research focused on the working of the split seconds’ arms.

FUNCTION INDICATOR

In a manner similar to a car’s gearbox, the function indicator allows one to see the winding, neutral and hand setting positions as the crown is pulled out. Each position is indicated via a hand at 4 o’clock displaying the following functions: W (Winding) – N (Neutral) – H (Hands).

FUNCTION INDICATOR

In a manner similar to a car’s gearbox, the function indicator allows one to see the winding, neutral and hand setting positions as the crown is pulled out. Each position is indicated via a hand at 4 o’clock displaying the following functions: W (Winding) – N (Neutral) – H (Hands).

MODULAR TIME SETTING MECHANISM FITTED AGAINST THE CASE BACK

Provides the following advantages for longevity and maintenance: - Since the component is mounted outside of the movement, the time setting assembly can be changed without affecting the integrity of the baseplate in the event of a possible defect or during maintenance, - The mounting and dismantling of this module from the back will not require the removal of the hands and the dial.

Characteristics

FINISHING

MOVEMENT
- Hand-polished bevelling
- Hand-polished locking-sections
- Microblasted milled sections
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