We had set our hearts on developing this watch, directly linked to the developments that led to our creation of the tourbillon model for Bubba Watson. The physical motions involved in this sport combine amplitude with precision, and the surprising sequence that contrasts moments of Zen-like preparation of concentration followed by the instantaneous shock of the shot, the long period of the ball’s trajectory and the subsequent walk to the next tee.
The RM 055 Bubba Watson is inspired by the RM 038 Bubba Watson tourbillon watch presented in 2011. Its mechanical movement, crafted in grade 5 titanium displays extreme skeletonisation. The RM 055 is a highly technical creation that is innovative, sporty and hand-finished in the finest watchmaking tradition.
RM 055 BUBBA WATSON
Manual winding skeletonised movement with hours, minutes and seconds.
Circa 55 hours (± 10%).
This mechanical movement in grade 5 titanium displays extreme skeletonisation, with a PVD- and Titalyt® treated baseplate and bridges. This combination confers great rigidity on the whole assembly, as well as the precise surface flatness essential for perfect functioning of the gear train.
The skeletonised baseplate and bridges were subjected to intensive and complete validation tests to optimise their resistance capacities. The Calibre RMUL2 is thus capable of withstanding accelerations of over 5000 g’s.
The free-sprung balance offers better reliability in the event of shocks, movement assembly or disassembly, and also guarantees better chronometric results over time. The regulator index is eliminated, and a more accurate and repeatable calibration is possible thanks to 4 small, adjustable weights located directly on the balance.
The double-barrel system helps to improve the torque stability over a longer period. This is achieved by distributing the stored energy across two winding barrels instead of one, which increases the number of rotations and reduces pressure on the teeth, bearings and pivots, resulting in better long-term performance.
SPLINE SCREWS IN GRADE 5 TITANIUM FOR THE BRIDGES AND CASE
This permits better control of torque applied to the screws during assembly. These screws are therefore unaffected by physical manipulation during assembly or disassembly and age well.
Movement dimensions: 30.25 x 28.45 mm
Thickness: 3.15 mm
Number of jewels: 24
Barrel arbour: AP 20 steel
Balance: Glucydur®, 4 arms, inertia moment 4.8 mg•cm2, angle of lift 53º
Frequency: 28,800 vph (4 Hz)
Balance spring: elinvar by Nivarox®
Index assembly: Triovis N° 2
Shock protection: Incabloc 908.22.211.100 (transparent)
Escapement wheel jewels: Rubifix (transparent)
Two-position stem: Manual winding, hand setting
The distinct construction of the RM 055’s case is designed to meet the demanding requirements of sportsmen. Thus the ATZ bezel is made from yttria-stabilised zirconia (ZrO2) and alumina (AlO2). High-pressure injection-moulding increases rigidity by 20 to 30% and reduces the material’s porosity to an absolute minimum.
ATZ is known for its stable colour and a toughness greater than that of sapphire. Next to diamond, it is one of the hardest materials in the world. Long and difficult machining using diamond tools is required to perfectly craft this complex, curved bezel and satin finish.
The caseband and back bezel are made of grade 5 titanium with a protective white rubber casing. This rubber is injected at high pressure around the titanium components, insulating the movement from all vibrations. This special surface treatment also makes the watch very comfortable to wear.
• Baseplate and bridges in grade 5 titanium, wet sandblasted, PVD-coated with a straight-line grain finish after coating and Titalyt® treatment for the bridges
• Hand-polished angles
• Screw slot and screws bevelled and polished with rounded and polished tip
• Straight line grain finish of the upper surfaces
• microblasted lower surfaces
• Hand-polished surfaces
• Hand-polished angles
• Concave chamfering with a diamond tool
• Diamond-polished angles
• Circular-finished faces
• Rhodium plating (before cutting the teeth)
In grade 5 titanium with collar in Alcryn.
Flange in black carbon fiber with index points filled with an approved luminescent material.
Minute flange in DLC-coated titanium.
Bezel side: in sapphire (1,800 Vickers) with anti-glare coating (on both sides).
Thickness: 1.50 mm
Case back: in sapphire (1,800 Vickers) with anti-glare coating (on both sides).
Thickness: 1.20 mm and 2.04 mm at the outer edges