Michael Friedberg Wrote:2. The calibre 89360 (and 89361 and presumably 89365, although I didn't ask) use a different system to deal with the drop in amplitude. It is not that the balance and hairspring are adjusted for isochronism (althought they are) but rather that there is a different design to the chronograph, using a so-called "vertical clutch". The vertical clutch is a new design technique and not used in IWC's outsourced chronographs, which are Valjoux based. A discussion of the design of the 89360 can be found, I believe, in the archives and is based on a discussion with Stefan Ihnen, who designed the c. 89360 and is now IWC's Technical Director. The avoidance of amplitude loss here is uniquely a matter of parts-design and not fine-tuning.
Regards, Shing | email iwcforme1976 (at) gmail (dot) comtime does not change us. it just unfolds us. max frisch.all that really belongs to us is time; even he who has nothing else has that. baltasar gracian.
Last edited: 8 December, 2012 - 16:07
Last edited: 23 March, 2015 - 10:21
Last edited: 25 February, 2015 - 17:29
Sincerely, Kelvin Leung_______________________________________________________________________________________Repeat after me: I don't need another IWC, I really don't need another IWC...
Last edited: 8 July, 2012 - 06:44
minimalist Wrote:Thank you all...Anyway, I love a vertical clutch & column wheel... It's enough :)
Last edited: 27 October, 2013 - 09:32