Richard Mille RM 031 High Performance Chronometer One Of 10 Pieces

CALIBRE RM031
Manual winding movement with hours, minutes, small seconds, and function indicator.

Limited edition of 10 pieces…

While brand technical-aesthetic credo is to open up fine watchmaking to the worlds of art, sport and lifestyle, brand purpose here was to tackle the archetype of watchmaking as a fine art, with performance as an added bonus. …

This model proved our capacity to produce a quintessential specimen of watchmaking orthodoxy which guarantees extreme performance over the long term….

The RM 031 is a timepiece that combines watchmaking tradition with pioneering concepts. Despite its orthodox design, it is the result of a determined desire to create the world’s most consistent mechanical calibre….

This is a highly ambitious goal that demands a variation of less than 30 seconds per month from the RM 031, which is far more difficult to obtain than more traditional daily accuracy rates allowing a variation in accuracy of 5 to 8 seconds per day….

The caliber RM031 is equipped with an AP direct-impulse escapement. Developed by APR&P for Audemars Piguet , this escapement represents a subtle combination of a detent escapement and a Swiss anchor escapement.

The AP escapement provides an improved chronometric results thanks to the direct action of the escapement wheel on the balance wheel in contrast to a Swiss anchor escapement in which the anchor acts directly on the escape wheel…..

The AP escapement beats at 36000 vibrations per hour and is fitted with two Elinvar spirals that are set in opposite directions. It delivers a well improved efficiency. A dart is specifically designed for this kind of escapement, which prevents any overbanking…

To ensure the excellent transmission of the power released by the double barrels, all the wheels of the movement have been optimized by a special profile or the teeth with a pressure angle of 20°. This feature, inspired by automobile transmissions, produces long, continuous transfer of power along the entire going trains of the High Performance escapement…

The round case (50 mm x 13.90 mm) is made in four parts according to an exceptionally complex design…