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Power reserve with chronograph running.
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Author:  Driver8 [ Fri Dec 12, 2008 4:08 am ]
Post subject:  Power reserve with chronograph running.
Over the last couple of days I decided to see how much of a difference running the chronograph makes to the power reserve of a full wound but unworn watch. Basically I gave all 5 of my chronograph pieces a full wind and set the chronographs running then put them back in the watch winder..... with the winder switched off obviously!

Results were quite interesting -

The Motors, 6.75, Le Mans, Navi World all ran for between 36 and 37 hours. So that indicates a reduction of around 5 or 6 hours of running time compared to non-chrono operation.

However, my SA was STILL RUNNING after 48 hours of non-stop chronograph use! :huh That's around 4 or 5 hours longer than I'd have expected in non-chrono use! :shock: Weird huh?
Author:  bnewbie [ Fri Dec 12, 2008 4:58 am ]
Post subject:  Re: Power reserve with chronograph running.
Driver8 wrote:
However, my SA was STILL RUNNING after 48 hours of non-stop chronograph use! :huh That's around 4 or 5 hours longer than I'd have expected in non-chrono use! :shock: Weird huh?

Big watch, big power reserve. :lol:
Good test you've made. :thumbsup:
Author:  BroncoSport [ Fri Dec 12, 2008 7:33 am ]
Post subject: 
That is interesting. Strange that the SA lasted that long. Must be he efficiency of that particular movement. The size of the watch should matter since the movements are the same size as the movements in the 43mm watches.

Speaking of which, did anyone happen to see the latest issue of WatchTime magazine? They had a review of the ChronoMatic 49 and they had a picture of the case with the back off, showing the movement. Pretty interesting that there is a "filler" ring or metal on the outside of the movement. I wonder if the inside of a SA looks like that as well.
Author:  Driver8 [ Fri Dec 12, 2008 7:43 am ]
Post subject: 
BroncoSport wrote:
That is interesting. Strange that the SA lasted that long. Must be he efficiency of that particular movement.

Yes, I thought it was odd as the B24 in the World is essentially just a B13 (like the SA) which a GMT module attached. I guess that mod obviously saps a bit of the power too.
Author:  Roffensian [ Fri Dec 12, 2008 9:01 am ]
Post subject: 
Driver8 wrote:
BroncoSport wrote:
That is interesting. Strange that the SA lasted that long. Must be he efficiency of that particular movement.

Yes, I thought it was odd as the B24 in the World is essentially just a B13 (like the SA) which a GMT module attached. I guess that mod obviously saps a bit of the power too.


Over time the mainspring probably loses some ability to maintain power, but your Le Mans should have a new mainspring from the service, so slightly surprising that didn't last longer.

The number of interactions between moving parts will obviously affect the reserve because that obviously requires energy.
Author:  shades [ Fri Dec 12, 2008 10:57 am ]
Post subject: 
Interesting test you ran there...i was thinking the other day to do the same thing with the crono running but i just kept putting it off, didn't want to see the motors stopped at all i guess. I still might try just to see if i get the same time approximately as you.

Well done Driver...good to know.
Author:  MuXi115 [ Fri Dec 12, 2008 1:17 pm ]
Post subject: 
I did this once with my SOC and it ran for 43.5 hours with the chrono running. I took it off on a Friday afternoon before I left for the weekend and checked it when I got home Sunday. I was suprised. I'll try it sometime without the chrono running and report back.
Author:  Magdalion [ Fri Dec 12, 2008 8:24 pm ]
Post subject: 
I tested my Skyland with the chrono running couple of weeks ago. I was pleasantly surprised to see it lasting for 45 hrs with non-stop chrono function...
Author:  Driver8 [ Sat Dec 13, 2008 4:30 am ]
Post subject: 
Magdalion wrote:
I tested my Skyland with the chrono running couple of weeks ago. I was pleasantly surprised to see it lasting for 45 hrs with non-stop chrono function...

I'm starting to think maybe I didn't give mine the full 40 winds! I'm going to try it again. :)
Author:  aleister [ Sat Dec 13, 2008 6:43 am ]
Post subject: 
Driver8 wrote:
Magdalion wrote:
I tested my Skyland with the chrono running couple of weeks ago. I was pleasantly surprised to see it lasting for 45 hrs with non-stop chrono function...

I'm starting to think maybe I didn't give mine the full 40 winds! I'm going to try it again. :)


Interesting results. You've probably already mentioned it in a thread I've missed while moving, but how long were the power reserves with the chronograpf off?
Author:  breitlingsource [ Sat Dec 13, 2008 8:40 am ]
Post subject: 
Yeah I'm interested in how long they will run with the Chronographs off as well. Cool test D8!
Author:  Driver8 [ Sat Dec 13, 2008 12:52 pm ]
Post subject: 
:oops: OOPS! BoneDoc will laugh at this after my "it's all about the numbers" quote a few days ago, but I've just realised that I cocked up on my maths when I said they lasted around 36 hours with the chronos running!!!

The chronographs (apart from the SA) were all telling me that they stopped approx 6 hours before I checked them. Bizarrely I clearly had a mental block and seemed to think that 2 days was 42 hours instead of 48! :shock: Hence I thought, "Ah ha 42 less 6 hours is 36"........ when really I should've said "Ah ha, 48 less 6 hours is 42". :oops:

So, yes it's safe to say that running the chrono appears to mean you'll get around 42 hours of power reserve. The SA was still running at 48 hours which is impressive, but the others performed far better than I led you to believe.

I hang my head in shame. :oops:
Author:  Roffensian [ Sat Dec 13, 2008 2:46 pm ]
Post subject: 
Driver8 wrote:
:oops: OOPS! BoneDoc will laugh at this after my "it's all about the numbers" quote a few days ago, but I've just realised that I cocked up on my maths when I said they lasted around 36 hours with the chronos running!!!

The chronographs (apart from the SA) were all telling me that they stopped approx 6 hours before I checked them. Bizarrely I clearly had a mental block and seemed to think that 2 days was 42 hours instead of 48! :shock: Hence I thought, "Ah ha 42 less 6 hours is 36"........ when really I should've said "Ah ha, 48 less 6 hours is 42". :oops:

So, yes it's safe to say that running the chrono appears to mean you'll get around 42 hours of power reserve. The SA was still running at 48 hours which is impressive, but the others performed far better than I led you to believe.

I hang my head in shame. :oops:


The stooopidity of youth never ceases to amaze me!!! :roll: (Driver8 is a year younger than me I believe)

Silly boy :wink:

We'll forgive you this time Driver8, but we're watching :lol:
Author:  BoneDoc [ Sat Dec 13, 2008 3:42 pm ]
Post subject: 
[quote="Driver8"]:oops: OOPS! BoneDoc will laugh at this after my "it's all about the numbers" quote a few days ago, but I've just realised that I cocked up on my maths when I said they lasted around 36 hours with the chronos running!!!quote]

Yup!! :rofl: :rofl: :rofl: :rofl: :rofl: :rofl: :drunk: :drunk: :huh :huh :rofl: :rofl: :rofl: :rofl: :rofl: :rofl: :rofl: :rofl: :rofl: :rofl: :rofl: :rofl: :rofl: :nutkick: (over the top I realize. But it realy did strike me as funny. Calculates how many seconds in a day in his head and forgets how many hours are in two. Funny!)
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