IWC Big Pilots 43 TPD & Winder Settings | Aevitas

A IWC Big Pilots 43 (IW3293, Cal. 82100) that sits unworn will run its power reserve down within days. Set a winder to 725 turns per day, rotating in both directions, and it stays wound without any fuss.

Recommended Winder Settings

Setting	Value
Turns per day (TPD)	725
Winding direction	bidirectional
Movement	Cal. 82100

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Why These Settings Matter

The 725 TPD figure reflects how much energy this movement uses in a day and how efficiently its rotor converts motion into power. Match it and the Big Pilots 43 holds a healthy reserve indefinitely. Set the winder far lower and the reserve slowly drains until the watch stops.

Overshooting is not a hazard. A slipping bridle inside the barrel releases tension once the mainspring reaches full wind — a safeguard fitted to modern automatic movements — so an excessive TPD cannot damage the watch. At worst, the movement is exercised more than it needs to be.

Because all Aevitas winders offer settings from 650 to 1,850 TPD, you can programme exactly 725 TPD for this watch — and reprogramme in moments if you swap watches around.

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