Power reserve capacity?

Thread: Power reserve capacity?

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  1. #1
    Member Nauticus's Avatar
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    Power reserve capacity?

    I know, it sounds like a very stupid question. But even after some time , I couldn't find any suitable answer for this:
    Why do most movements come along with a power reserve, that isn't close to a multiple of 24h?

    Especially with hand wound movements, I would think that the designers try to follow a daily schedule - If I forget to wind my watch today, it would be helpful if it runs until tomorrow. But what's the advantage of having a 40h power reserve?? This means, its stops in the middle of the following night (as it usually does with my Nomos...).

    Looking at the usual suspects: Peseux 7001: 42h, ETA 2801: 46h, Valjoux 7760: 42h...

    Anybody an idea? I mean, if it doesn't last for 48h, even 26h are enough...?

    Thanks for explaining me the reason.

    Regards Nauticus (Niels)

  2. #2
    stuffler,mike
    Guest

    Re: Power reserve capacity?

    Well, you´re right and you´re are not.

    The power reserve indication itself represents the amount of tension of the mainspring, thus the lower is the tension the less time is left until another winding of the watch.

    But: In order to run at a regular rate a mechanical timepiece needs to have at least 30 per cent of its mainspring wound. The trick is to keep the mainspring that wounded that the best accuracy can be achieved. It´s quite possible that a watch fully wounded runs faster than the watch is running on 10 per cent. The secret is to keep the 30 per cent.

    So - with a power reserve of 40h your watch with a Peseux 7001 should at least show a power reserve of 13 to 22h to perform at its best. Constant running is the aim.

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