Rotor on my new Flieger no-logo COSC is a little "sticky"
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Thread: Rotor on my new Flieger no-logo COSC is a little "sticky"

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  1. #1
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    Rotor on my new Flieger no-logo COSC is a little "sticky"

    Just got my Flieger no-logo w/ COSC movement (2824-2) a couple days ago. The movement definitely looks more refined than the standard grade ETA in my Hamilton Khaki, but there's a very clear difference in how the rotors spin.

    The "German silver" rotor in my Stowa seems to be a little "sticky". By that I mean that the rotor only spins if the watch itself is rotated enough (say, 30-45 degrees). If I slowly rotate my watch, the rotor will stay put until it reaches a certain threshhold, and then it'll quickly "drop" to the lowest point (gravity). In contrast, the rotor in my Hamilton moves extremely freely. If I slowly rotate the watch, the rotor will rotate in the opposite direction along with it. It is always at the lowest point. If I suddently spin my watch, the rotor will move in a pendulum-like (back-and-forth) motion because there is almost no friction.

    Why is there such a difference between the movements? They're both ETA 2824-2. The only difference I can tell besides the different grades are that the Stowa has perlage decoration and a different rotor, but I can't imagine these things affecting its rotation. Accuracy is OK (+7 sec/24 hrs, which is a little higher than a COSC movement should be), but I haven't been able to check power reserve after wearing it yet. Hopefully it won't be diminished too much due to lack of adequate rotor spinning.
    Last edited by DaveInLA; March 3rd, 2011 at 04:18.
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  2. #2
    lvt
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    Re: Rotor on my new Flieger no-logo COSC is a little "sticky"

    Quote Originally Posted by DaveInLA View Post
    Why is there such a difference between the movements? They're both ETA 2824-2. The only difference I can tell besides the different grades are that the Stowa has "Geneva stripes" and a different rotor, but I can't imagine these things affecting its rotation. Accuracy is OK (+7 sec/24 hrs, which is a little higher than a COSC movement should be), but I haven't been able to check power reserve after wearing it yet. Hopefully it won't be diminished too much due to lack of adequate rotor spinning.

    I think when your watch's power reserve is high the rotor won't be able to spin freely due to resistance from the barel, try to leave the watch run out of PR and try again.
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    Re: Rotor on my new Flieger no-logo COSC is a little "sticky"

    I´ve felt exctly the same with my 2824 estandard. And I can't reach maximum power reserve without hand wound.

    It's also a no logo, with the "German silver" rotor.

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    Re: Rotor on my new Flieger no-logo COSC is a little "sticky"

    My COSC MA does exactly the same thing, as do a few other watches I have with the same movement for that matter.

    They all keep excellent time, but indeed sometimes the power reserve seem to have run out earlier than expected.
    Looks like this is pretty common for ETA 2824s

    Cheers,

    CT

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    Re: Rotor on my new Flieger no-logo COSC is a little "sticky"

    I went with the COSC and was a little taken back when I noticed the rotor didn't spin as freely. I had previously only had 7750 movements that wound easily out of the box. It seemed ultimately to only need some break in time and has been keeping good time ever since.
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    Re: Rotor on my new Flieger no-logo COSC is a little "sticky"

    My COSC FA is same too. I think that this is the default behavior of ETA 2824 due to it's bidirectional auto winding mechanism. And timekeeping is perfect it runs less than a second in a day. I never adjusted it within last four months. IMO full wound is not necessary for automatic movement.
    Last edited by catalkn; March 4th, 2011 at 09:38.

  8. #7
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    Re: Rotor on my new Flieger no-logo COSC is a little "sticky"

    The resistance of the rotor to move while turning the watch body will vary depending on how much the watch is wound. As well, the expected resistance would vary depending on the weight of the rotor and how much of that weight is in its periphery; that is, different rotors would result in different behavior, all else being equal.

    Regardless of all that, it's completely normal to have to rotate the watch body 30+ degrees before the rotor will follow.

    Don't worry, it's absolutely fine.

    Cheers.

  9. #8
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    Re: Rotor on my new Flieger no-logo COSC is a little "sticky"

    Yes, apparentlich the "Neusilber"-Rotor is just not as havy as the origin rotor from ETA. If you move normaly then it wont have any negativ impact on the watch and the power reserve will be enough. It will have even the advantage theat the movement will not wear as much as with the original rotor. If you are a "none-mover" than the might stop working before you might expect...
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