A powerful & striking watch - will definitely draw attention & makes for a great conversation piece.

SPLIT-SECONDS CHRONOGRAPH

The modern architecture of this movement enables for the consistent and rational arrangement of its constituent parts, avoiding unnecessary superimpositions and permitting the best possible use of the functions thanks to technical solutions.



The RMAC4 calibre is equipped with the latest-generation split-seconds mechanism developed by the engineers at Richard Mille. The 6-column wheel ensures optimised simultaneous movement, maximal function locking, and greater adjustment durability.



The chronograph was also subject to a battery of merciless tests to demonstrate its correct function in any situation, from shock and drop simulations to accelerated 10-year ageing phases for all its functions, to waterproof tests and magnetic field resistance trials.


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.



The skeletonised baseplate and the bridges were subjected to intensive and complete validation tests to optimise their resistance capacities.


 RAPID WINDING MECHANISM

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.



DATE DISPLAY

Semi-instantaneous, placed in a vertical aperture at 11 o’clock.

FUNCTION SELECTOR

The RM 65-01 is constructed with a highly specialised gearbox design for Winding, Date and Hand Setting functions. To shift back and forth through these different functions, use the pusher located at the centre of the crown until the desired function is selected.
The hand located at 4 o’clock will indicate W, D or H accordingly.

HIGH FREQUENCY BALANCE WITH VARIABLE INERTIA

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.

Movement dimensions: 31.78 x 29.98 mm
Thickness: 8.69 mm
Jewels: 51
Balance: Glucydur, 4 arms, moment of inertia 7.5 mg•cm2, angle of lift 53°
Frequency: 36,000 vph (5 Hz)
Balance spring: AK3
Index assembly: Triovis n° 2