KMII
[Montblanc Moderator]
51276
You are right there…
Micro rotors are way less efficient at winding than a full sized rotor all things being equal. And many micro rotors don’t fully wind the watch. In terms of material anything that’s not platinum or tungsten is likely too light for a fully effective micro rotor and a thinning o Frye mass towards the edge is a terrible idea, as bvlgari found out to the customers’ displeasure.
A three quarter rotor, as used by ALS, GO and now UG is vastly better, even if not quite as good as a full sized rotor.
Micro Rotors - Please correct me if this is wrong.
I have heard that micro rotors are not very efficient at winding due to lacking the weight of a full sized rotor. In some ways I can see how this makes sense, in other ways I can't.
I have heard this too
Stands to reason there is less leverage in hte small rotor to wind the mainspring ... but good engineering, excellent bearings, etc. can offset those disadvantages.
I do not think this can be generalized…
Yes, of course if you have a bigger diameter, and the mass is further outside, this helps. But, I mean, the heavyweight metal is just at the outside then, and the micro rotor is usually totally out of gold, platinum or tungsten! Also, the bearing is essen...
You are right there…
Micro rotors are way less efficient at winding than a full sized rotor all things being equal. And many micro rotors don’t fully wind the watch. In terms of material anything that’s not platinum or tungsten is likely too light for a fully effective micro ...
I can talk for the Finissimo
It depends if you have an active day or basically rest in front of screen.
It matches my understanding, all things being equal
My understanding is that all things being equal (eg quality of manufacturing) micro rotors are less efficient than full sized rotors. Where they outperform is that they allow to make the watch thinner by saving one “level” if I may say it so, similar to t...
From the same amount of metal,
…a larger diameter rotor harvests more energy per spin. Micro rotors may spin as fast, but they aren’t developing the same amount of torque as the same metal casted into a 3/4 or full rotor