Richard Mille Prototype Tourbillon RM 27-02 Rafael Nadal for Only Watch
For Only Watch 2015, Richard Mille has generously donated a prototype of the groundbreaking Tourbillon RM 27-02 Rafael Nadal, worn and tested by Rafael Nadal himself during international competitions over the 2015 tennis season.
An ultra-light watch with case back and bezel made from NTPT carbon fused with TPT Quartz, various layers of each material is exposed at random during machining, yielding a unique aesthetic. The RM 27-02 is the first watch to use a skeletonised “unibody” baseplate, in which the NTPT carbon case band and baseplate are fused into a single piece. Combined with titanium bridges, they support an exquisitely finished tourbillon-equipped movement that can resist shocks up to 5000g.
To be sold on 7 November 2015 at the Only Watch sale to raise funds for Duchenne Muscular Dystrophy.
CALIBER RM27-02: manual winding tourbillon movement with hours and minutes.
Dimensions: 47.77 x 39.70 x 12.25 mm.
Weight of the movement: circa 3.35 g.
POWER RESERVE – 70 hours (±10%).
UNIBODY BASEPLATE IN NTPT CARBON
The baseplate of the RM 27-02 is machined from NTPT carbon. This material consists of multiple layers of parallel filaments obtained by separating carbon threads. With a maximum thickness of 30 microns, the NTPT carbon layers are saturated with resin then piled onto a special machine that modifies the orientation of the fibers between each layer by 45°. Once it has been heated to 120°C and subjected to a pressure of 6 bars, the NTPT carbon is machined
at Proart, Richard Mille’s parts factory. NTPT carbon is renowned for its excellent resistance to micro-cracks and splits.
The baseplate of the RM 27-02 is an integral part of the case. For the first time at Richard Mille, the case middle has been removed. The bezel and case back are assembled directly on the baseplate, which is described as “unibody”, a type of racing-car construction that ensures maximum rigidity and greater resistance to impacts.
The skeletonised NTPT carbon baseplate is a feat of machining. A master component of the RM 27-02, it has been subjected to a full battery of extreme approval tests in order to optimize its mechanical properties.
BRIDGES IN GRADE 5 TITANIUM
Grade 5 titanium is a biocompatible, highly corrosion-resistant and remarkably rigid alloy, which enables the gear train to function effortlessly. The alloy is 90% titanium, 6% aluminum and 4% vanadium. This combination further increases its mechanical properties, which explains its frequent use in the aerospace, aeronautical and automobile industries.
Like the baseplate, the bridges of the RM27-02 caliber were subjected to intensive and comprehensive approval tests in order to optimize their resistance properties.
FREE SPRUNG BALANCE WITH VARIABLE INERTIA
A free sprung balance with variable inertia and a terminal-curve spring guarantees greater reliability in case of impacts and during movement assembly and disassembly, thus achieving better chronometric results over time.
FAST ROTATING BARREL (6 hours per revolution instead of 7.5 hours)
This type of barrel has the following advantages:
– The phenomenon of periodic internal mainspring adhesion is significantly diminished and performance is thus enhanced,
– It provides an excellent delta of the mainspring curve. The choice is determined by the ideal power reserve/performance/regularity ratio
BARREL PAWL WITH PROGRESSIVE RECOIL
This device permits an appreciable winding gain (circa 20 %), especially during the start of winding. It also promotes the even distribution of the mainspring’s internal tension.
WINDING BARREL TEETH AND CENTRE-WHEEL PINION WITH CENTRAL INVOLUTE PROFILE
The central involute profile of the winding barrel teeth provides an optimal pressure angle of 20°, which promotes effective rotary motion and compensates for possible variations in the operation of the going train. This, in turn, ensures excellent torque transmission and a distinct improvement in performance.
CLOSURE OF THE BARREL COVER USING EXCENTRIC SCREWS
This characteristic ensures the cover stays in place even when considerable pressure is applied.
SPLINE SCREWS IN GRADE 5 TITANIUM FOR THE BRIDGES
This permits better control of the torque applied to the screws during assembly. These screws are therefore unaffected by physical manipulation during assembly or disassembly and age well.
– Movement dimensions: 29.30 mm x 29.60 mm
– Thickness: 7.10 mm
– Tourbillon diameter: 12.30 mm
– Balance diameter: 10.00 mm
– Number of jewels: 19
– Balance: in Glucydur, with 2 arms and 4 setting screws
– Moment of inertia: 11.50 mg.cm2, angle of lift 53°
– Frequency: 3 Hz (21,600 vph)
– Balance spring: in ELINVAR by Nivarox®
– Shock absorbers: Kif Elastor by KE 160 B28
– Barrel shafts: in nickel-free Chronifer (DIN x 46 Cr13 + S), with the following characteristics:
stainless, non-magnetic, tempered.
The bezel and case back of the RM 27-02 are made from NTPT carbon and TPT Quartz, a groundbreaking new material designed and developed by Richard Mille in partnership with North Thin Ply Technology.
TPT Quartz is composed of over 600 layers of parallel filaments obtained from separating silica threads. These layers, no thicker than 45 microns, are saturated in a white resin developed specially for Richard Mille, then inserted between layers of NTPT carbon using an automatic positioning system that changes the orientation of the fibers between each layer by 45°. It is then heated to 120°C and subjected to a pressure of 6 bars in an autoclave similar to those used to
make aeronautical components, before the material is ready for machining on a CNC machine at Proart, Richard Mille’s case factory. Machining unveils the various TPT Quartz layers at random, ensuring that each machined component is unique.
Quartz fibers are generally used for very high performance applications due to their resistance to high temperatures, their strength, and their transparency to electromagnetic waves.
The bezel and case back are assembled directly on the NTPT carbon baseplate. The case, which is water-resistant to 50 meters thanks to two Nitril O-rings, is assembled using 12 spline screws in grade 5 titanium and 316L stainless steel washers.
SPLINE SCREWS IN GRADE 5 TITANIUM FOR THE CASE
Due to their design, these screws offer better control of the torque applied to them during assembly. They therefore remain unaffected by the physical manipulations involved in assembly and dismantling, and age well.
TORQUE LIMITING CROWN
This additional security system prevents from accidental overwinding, which could cause damage to the winding stem or putting extreme pressure on the mainspring barrel.
Upper flange in carbon nanotube.
sapphire (1800 Vickers) with anti-glare treatment (2 sides).
Thickness: 1.20 mm and 4.09 mm at the edges.
– Gradual hand-polished beveling
– Shot-blasted milled sections
– Stretched upper surfaces
– Shot-blasted surfaces
– Satin-brushed surfaces
– Hand-polished beveling
– Long strokes
– Matt “brouillé” strokes
– Long strokes on the sides
– Polished sinks
– Lapped and polished ends
– Burnished pivots
– Diamond-polished sinks
– Circular decorations on the front surfaces
– Rhodium-plating (before cutting the teeth)
– Minimal corrections are made to the wheels to preserve their geometry and overall performance