INTRODUCTION The RM 65-01 is our interpretation of a highly complex motorsport inspired chronograph. It fully embodies our technical approach thanks to the combination of several additional functions, a very specific architecture and aesthetics of the highest order. 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 Around 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. The skeletonised baseplate and the bridges were subjected to intensive and complete validation tests to optimise their resistance capacities. 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. 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.