Frank Vernay serves as the Head of Movement Development at Rolex. Recently, Vernay has been instrumental in the development of the Dynapulse escapement, a groundbreaking mechanism equipping the Land-Dweller.
Where does the Dynapulse escapement stand in terms of progress in watchmaking?
The Dynapulse escapement constitutes a new technical signature for Rolex. It is a revolution in watchmaking while remaining true to our brand’s fundamental principles and traditions. This sequential distribution escapement particularly offers high energy efficiency, approximately 30 per cent more than a conventional Swiss lever escapement, while taking up no more space. Thanks to the Dynapulse escapement, Rolex can now extend the family of 71XX movements with the addition of a 5 Hz calibre.
The groundwork for this high-performance escapement began around 10 years ago. It has taken time for the project to mature and for us to get to where we are today, with a solution covered by a total of seven patent applications. Much of the work concentrated on simplifying the shape of the wheels and the impulse rocker so that these components could be made out of silicon. Fitting such a complex mechanism into the same space as a conventional Swiss lever escapement constituted a real technological challenge, as did the production and pre-assembly of the small components in silicon. Then, assembling the Dynapulse escapement in the calibre entailed a complete rethink of our movement manufacturing and assembly processes.
What were the challenges in increasing the movement frequency?
Increasing the frequency from 4 Hz to 5 Hz constitutes a major step for Rolex in the history of precision. The higher a movement’s frequency, the more quickly it consumes the energy supplied by the self-winding system. This energy consumption needed to be optimized.
We therefore completely redesigned the escapement, enabling us to offer the same power reserve as that of calibre 7140. Suitable solutions also had to be found to guarantee the movement’s reliability. The new rate also meant modifying our algorithms and measuring equipment. Additionally, we had to develop a diagnostic system to validate the functioning of the Dynapulse escapement in each assembled movement prior to casing, given that there is no longer any pallet stone adjustment as in a traditional Swiss lever escapement.
For the owner of the watch, what are the practical advantages in everyday wear?
A higher frequency confers greater stability to the rate of the watch in all circumstances. Robustness and reliability are enhanced, no matter the activity the wearer may be engaged in.