Finding the system that will do for wrist watches what the Tourbillon did for pocket watches is one of the great challenges of the 21st Century. Since the beginning, the best watchmakers have tried to defy the effects of gravity, that sworn enemy of accuracy. In a veritable technical revolution, ZENITH Manufacture has devised the Zero-G system.
The gyroscope cage Tourbillon comprises an escapement mounted on cardan joints rather like marine chronometers. The instrument, which is sensitive to changes of position, is kept in a constant horizontal position, thereby ensuring optimal amplitude for the spiral balance-wheel. Coordination is provided by an invention patented by ZENITH: a second gear train is the reference point for the swinging of the escapement axles and a differential gear with inverter compensates all the relative movements of the framework.
The Zero-G Tourbillon, whose cage alone comprises 166 of the 294 parts that make up the device, 10 conical geared wheels with spiral teeth and 6 ball-bearings, was developed from the El Primero automatic caliber that beats at the record speed of 36,000 vibrations an hour.
Bringing the Tourbillon Zero G and the Defy Xtreme range together produces an unforeseen design, a perfect alchemy of engine and bodywork. A figure 8 on its side, symbolising infinity or a lucky number, is drawn around the hours and minutes display at 11 o’clock and around the opening of the phenomenal Tourbillon at 5 o’clock.
A multi-layered dial of Hesalite glass, carbon fibre and aluminium beneath two sapphire glasses, a blackened titanium case that is waterproof at 1000 meters, a black shot-peened titanium case, a protected crown, helium valve and titanium bracelet with Kevlar inserts and high-temperature resistance are the features that make this an extreme sports timepiece. A new star at the zenith of the firmament, available in a numbered series and with the 2008 millésime.
Caliber NEW El Primero 8800
Automatic movement with unique gyroscopic system that ensures perfect horizontal positioning of the regulating organ
Gyroscopic cage made of 166 components, 10 conical-geared wheels (with 6 spherical wheels) & 6 ball bearings
36’000 vibrations per hour
Power reserve over 50 hours; Automatic winding in both directions
Excentered rotor, in Platinum, on ball bearings
Hour and minutes excentered at 11 o’clock
Gyroscopic cage with second indicator at 5 o’clock
Black Titanium case
Diameter: 46.5 mm. Height: 21.4 mm
Black Titanium screw-in crown with specific protecting device
Sapphire-blasted Titanium bezel
Helium valve at 10 o’clock
Black Titanium case back
Water-resistance up to 1’000 meters
Crystal: 2 front sapphire glass with anti-reflective coating on both sides; 1 sapphire glass at the back with anti-reflective coating
Multi-layered dial made of Hesalite transparent glass , carbon fiber and aluminium
Hands: Black hour, minute & second hands with red Superluminova inserts
High-temperature resistant bracelet in Black Titanium, with Kevlar© lateral inserts
Buckle: Brushed black titanium triple folded clasp