RM 65-01: Automatic Winding Split-Seconds Chronograph By Richard Mille

A highly complex sports timepiece, a masterpiece of technical prowess designed for everyday use and for any situation, such is the latest execution of Richard Mille’s tireless quest for innovation, the new RM 65-01.

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The culmination of some five years of development, this automatic split-seconds chronograph is the most complex timepiece ever to leave the Richard Mille workshops. This model fully embodies the brand’s technical approach thanks to the combination of several additional functions, a very specific architecture and an extremely high-end aesthetic. All in all, a fabulous challenge of mechanical watchmaking that called for patience, technicity and utter perseverance.

CALIBRE RMAC4

Skeletonised automatic winding movement with hours, minutes, seconds at 6 o’clock, date, split-seconds chronograph with 30-minute counter at 3 o’clock, 12-hour counter at 9 o’clock, function selector, rapid winding and variable-geometry rotor.

POWER RESERVE
Circa 60 hours (± 10%). Actual power reserve results will depend on how much the chronograph features are utilised.

BASEPLATE AND BRIDGES MADE OF GRADE 5 TITANIUM
The baseplate and the bridges are crafted of grade 5 titanium, a biocompatible, highly corrosion-resistant and remarkably rigid alloy, which enables the gear train to function effortlessly. The alloy is 90% grade 5 titanium, 6% aluminium and 4% vanadium. This combination further increases the material’s mechanical properties, which explains its frequent use in the aerospace, aeronautical and automobile industries. The baseplate of the calibre RMAC4 has been optimised to for an extremely low weight / resistance ratio.

RAPID WINDING MECHANISM
The skeletonised baseplate and the bridges were subjected to intensive and complete validation tests to optimise their resistance capacities. The rapid winding mechanism was developed in addition to the automatic winding and winding with the crown. It allows the barrel to be quickly rearmed in the event the watch stops. By pressing on the pusher at 8 o’clock, you allow the barrel to be fully reset. This function is ideal for quickly rearming the watch if not worn for a long time. This highly practical function, described as ‘very playful’ by Richard Mille’s engineers, was particularly difficult to develop because of its high levels of torque transfer. During the ageing tests, the function was activated thousands of times.

Beating at 5Hz (36,000 vph), the fast-beating free-sprung balance offers better reliability in the event of shocks, movement assembly and disassembly, and also guarantees better chronometric results over an extended period of time, keeping a more accurate time. This new type of balance at Richard Mille can measure accurately to 1/10th of a second, ideal for a split-seconds chronograph watch under sporting conditions. The regulator index is eliminated, and a more accurate and repeatable adjustment is possible thanks to 4 small, adjustable weights located directly on the balance.

 

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Report by richardmille.com


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