THE WORLD’S LIGHTEST SPLIT-SECONDS TOURBILLON CHRONOGRAPH
RM 50-03 TOURBILLON CHRONOGRAPH McLAREN F1
This indicator supplies information about the mainspring’s tension, permitting an optimisation of the movement’s chronometric functioning. Below 5.3 N.mm, the spring is considered too slack, while above 6.5 N.mm, excess tension in the spring can adversely affect the mechanism’s operation, or actually endanger it.
The power-reserve indicator shows the number of hours of energy left in the mainspring before the watch must be wound again.
FAST-ROTATING BARREL (6 hours per revolution instead of 7.5 hours)
This type of barrel provides the following advantages:
• The phenomenon of periodic internal mainspring adhesion is significantly diminished, thereby increasing performance.
• Provision of an excellent mainspring delta curve with an ideal power reserve/performance and regularity ratio.
WINDING-BARREL TEETH AND THIRD-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.
Movement dimensions: 31.10 x 32.15 mm
Thickness: 10.02 mm
Tourbillon diameter: 12.40 mm
Balance wheel diameter: 10.00 mm
Number of jewels: 43
Balance wheel: Glucydur®, 2 arms, 4 setting screws, moment of inertia 10 mg•cm2, angle of lift 53°
Frequency: 21,600 vph (3 Hz)
Balance spring: elinvar by Nivarox®
Shock protection: KIF Elastor KE 160 B28
Barrel shaft: nickel-free Chronifer® (DIN x 46 Cr 13 + S) with the following characteristics: stainless – antimagnetic - suitable for tempering
UPPER AND LOWER FLANGES
In Carbon TPT® filled with an approved luminescent coating.
This additional security system prevents accidental overwinding, which could cause damage to the winding stem or put extreme pressure on the barrel spring.
The shape of the crown takes its cue from the racing competition wheel rims used by the British team, while the hollow pushers of the chronograph recall the air intake ducts on the McLaren F1 car.