What is a Constant Force Tourbillon? (GS SLGT003)
Grand Seiko just announced their first Tourbillon watch and it is a sight to behold. It is not an ordinary tourbillon as it is a constant force tourbillon with a 1 second remontoir d'egalite encased with the tourbillon that works as both the constant force mechanism and second hand.
What is a remontoir d'egalite?
A problem with automatic watches is the force (torque) supplied by the mainspring to the balance wheel is not constant. This greatly affects the balance wheel isochronism (consistant beat) and accuracy. To alleviate this issue, remontoir d'egalite is deployed as a intermediator in between the main spring and balance wheel. The remontoir d'egalite is basically another spring with less tension that convert the inconsistent force from the main spring and help to supply constant force to the balance wheel.
Developing a remontoir d'egalite in itself is hard to achieve, however putting it on the tourbillon movement to work as a second hands shows the technical advancement of the Japanese watchmaker to innovate world-class movements.
Details: https://www.grand-seiko.com/global-en/collections/slgt003g
Movement: 9ST1
Case size : Diameter 43.8 mm; Lug-to-lug 50.6 mm; Thickness 12.9 mm
Materials: Platinum and Titanium
Water Resistance: 100 m
You can also learn more about the remontoir d'egalite from:
https://www.youtube.com/watch?v=SdEfzMSvhpY&t=624s&ab_channel=WatchArtSci
🇮🇩🇭🇰 New watch enthusiast & accuracy snob from Indonesia! Want to learn more about horology with fellow enthusiast! Proud owner of Seiko SARB033 & Casio GW-M5610