RM 74-02

Automatic Winding Tourbillon
RM 74-02watch cover
RM 74-02

Introduction

Uniquely appealing and technically complex

The RM 74-01 and RM 74-02 In-House Automatic Tourbillons offer two new versions of the fully in-house automatic tourbillon calibre. These two striking models, both with the same ultra-skeletonised heart, are distinguished by the materials used for their cases as well as by their aesthetics, making them fraternal twins with unique personalities.

RM 74-02 AUTOMATIC TOURBILLON

IN-HOUSE CALIBRE CRMT5

Skeletonised automatic-winding tourbillon movement with hours, minutes and variable-geometry rotor.ve:

Power reserve : Circa 50 hours (± 10%)
revRM74-02_6H_BB

BASEPLATE AND BRIDGES MADE OF GOLD

The baseplate and bridges of the RM 74-02 are machined from 18K 5N red gold and 18K 3N yellow gold respectively, both microblasted and bevelled by hand.

The skeletonised baseplate and bridges were subjected to intensive and complete validation tests to optimise their resistance capacities
revbaseplate74-02

FREE-SPRUNG BALANCE WITH VARIABLE INERTIA

This type of balance wheel represents the ultimate in innovation. It guarantees greater reliability when subjected to shocks and during movement assembly or disassembly, hence better chronometric results over time.
The regulator index is eliminated, and a more accurate and repeatable calibration is possible thanks to 4 small, adjustable weights located directly on the balance.

FREE-SPRUNG BALANCE WITH VARIABLE INERTIA

VARIABLE-GEOMETRY ROTOR

Rotor specifications:
• Heavy outside edge and heavy edge ring in 18K pink gold
• Weight segment in platinum
• 18K white gold wings
• Automatic OneWay® winding system in ceramic with ball bearings
• Bidirectional winding system

This variable-geometry rotor has been incorporated within the in-house CRMT5 calibre, making it possible to set the rotor according to the owner’s activity level.

The setting is modified by adjusting the two moveable weights into the correct position and fixing them in place with spline screws. The inertia of the movement is increased when the two weights are closer together; the barrel then rewinds more quickly. If the weights are positioned at the extremities of the rotor, the inertia is decreased and the barrel winds more slowly.
rotor74-02

MOVEMENT CHARACTERISTICS

- Movement dimensions: 30.70 x 23.70 mm
- Thickness: 6.20 mm
- Number of jewels: 23
- Balance: CuBe, 4 arms, 4 setting weights, moment of inertia of 7.5 mg.cm2, 50º angle of lift
- Frequency: 28,800 vph (4 Hz)
- Balance spring: AK 3
- Shock protection: INCABLOC 908.22.211.100 (transparent)

MOVEMENT CHARACTERISTICS

CASE IN GOLD CARBON TPT®

The design and execution of the watch demonstrate a holistic approach to conception of the movement, case and dial. As a result, everything has been constructed according to extremely rigorous specifications. For example, a casing ring is no longer used, and the movement is fixed by titanium screws.

Gold Carbon TPT® is a high-tech material comprising some 600 layers of parallel filaments obtained by separating out carbon fibres. The layers, no more than 30 microns thick, are impregnated with a black matrix. They are then assembled on a dedicated machine, which stacks the layers, varying the orientation of the fibres by 45° between layers and alternating them with 24K yellow gold leaf layers. As gold is a noble material in chemical terms, it was very difficult for the NTPT and Richard Mille engineers to ensure it ‘fused’ correctly with carbon. The composite is then heated to 120°C at a pressure of 6 bars in a kiln similar to that used for the production of aeronautics parts, after which it is ready to be machined at Richard Mille.
RM74-02_5H_BB

This process accentuates the specific characteristics of these materials, which in turn enhance the contours of the cases they adorn thanks to the unique play of light they create and their extremely attractive graduation of golden tones. The caseband is made of 18K 5N red gold.

The tripartite case is water resistant to 50 metres ensured by 2 Nitrile O-ring seals. The case is assembled with 20 grade 5 titanium spline screws and abrasion-resistant washers in 316 L stainless steel.

Finishing

Other features