Interesting Experiment

First of all, thank-you for all the comments to my last post Interesting Experiment.  Sorry I couldn't respond but I was flying out the door just after posting.

While on the trail I had an idea for an experiment to test the efficiency of the various calibers I have.  Each movement was allowed to run to a standstill then given 10 turns to start up again.  They were left in the same position and their running time was recorded:

cal. 1072/1 auto - 11hr 12min (service nk)
cal. 439 man - 12hr 10min (service nk, also ran slow)
cal. 1120 auto - 12hr 31min (serviced 2008)
cal. 1072 auto - 13hr 55min (serviced 2008)
cal. 434 man - 13hr 57min (service nk)
cal. 1003 man - 16hr 24min (serviced 2006)

So the little 1003 was by far the winner!  But most surprising was the 434 chronograph that performed so well.  I wonder if manual movements are designed with larger mainsprings?

Looks like the 439 pocketwatch and 1072/1 are due for a service Interesting Experiment.

I think the automatic watches may have lower gear ratios.
03/21/2009 - 02:11
Since they are designed to be wound automatically their manual winding mechanisms tend to be less robust than those of manual watches. In order to compensate, I think that in general they yield less winding per turn. Can anyone confirm that?
Need a contest?
03/22/2009 - 01:48

All the "gearheads" must be away 'cause I'd expect some facts or at least opinions by now on the reasons why manual movements ran longer than autos in my experiment!  I'm still inclined to believe the mainspring is smaller in automatic movements as they would recieve constant torque when worn, while the manual would be wound only once a day. 

Perhaps we need a contest .  I see that over half the entries to the pen giveaway have five or less posts, so contests obviously increase participation.  I hope Alex has a large goodie bag to keep the momentum going .

Re: Need a contest?
03/22/2009 - 03:42
I hate to sound cynical and I do hope that a large number of those registering for the draw will become acrtive contributors. But I will also state, with all due respect, that the pen is not exactly a common item and quite valuable. The last one I saw on eBay quite a while ago went for over $750US. JB
I'm not enough of a "gearhead" to opine on your post Dean...
03/24/2009 - 13:10

...I'm more focused on pictures/ shinny/ beautiful things... That's not to say that I didn't enjoy it - I do enjoy reading these more technical posts, they do help me undertand and appreicate more the way these little mechanical marvels function Cheers,  Francois