Zenith Academy El Primero Tourbillon Georges Favre-Jacot Chain Fuse Tourbillon 49.2520.4805/98.R576 Limited to Only 150 Pieces
- Calibre: El Primero 4805
- Winding: Manual
- Frequency: 36,000 vph / 5 Hz
- Components: 807
- Jewels: 32
- Power reserve: Minimum 50 hours
- Tourbillon: One-minute rotation
- Transmission: Fusée and chain
- Functions: Hours, minutes, tourbillon and power reserve
Fusée-and-Chain Transmission
The most fascinating feature is arguably the fusée-and-chain mechanism.
A traditional mechanical movement can experience variations in torque as the mainspring unwinds. The fusée-and-chain system is designed to help regulate the force delivered from the mainspring to the gear train.
The chain connects the barrel to the cone-shaped fusée. As the mainspring unwinds, the changing leverage of the fusée helps compensate for variations in available torque.
For Zenith, this was particularly significant because the Academy Georges Favre-Jacot became the manufacture’s first wristwatch combining a tourbillon with a fusée-and-chain transmission.