/fa/ - Fashion

>>14133660
>Do reverse coils have a totally flat force curve for the duration of the wind?
Not totally flat, and not for the entire duration, but flatter, and with less extreme torque difference at both ends of the winding that the old non-reversing mainsprings. Basically these are already good enough for chronometers.

Here's a graph from the book we studied from, showing a bit exaggerated example. The most constant torque will be between one and a half and six and a half turns of the mainspring barrel.