Calibre JCFM10 features a pair of triple-axis, sequential, flying, high-speed tourbillons. Each one of them rotates along three different axes. Each axis drives a separate cage. The first, outermost one makes a full turn in 180 seconds, the second one in 24 seconds and the third one, closest to the 3 Hz balance wheel, in 48 seconds. Compared to the traditional one-minute rotation of a flat tourbillon, and to many multi-axis tourbillons, 24 and 48 seconds are very high figures. This explains why Jacob & Co. calls them high-speed tourbillons.
Mounted on the wheel that drives the tourbillon, a spring accumulates energy to allow the cages to jump forward. They don’t just move in small incremental moves, but large ones, creating a series of sequential, very visible moves, with pauses in between.
The tourbillons inside calibre JCFM10 have no upper bridge. Their only grounding in the black-chromium mainplate happens underneath, which makes them flying tourbillons.
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