So I did a 4 week + run on my 69 Speedy and 2007 Railmaster with the app TwixT. The results are posted below. Anybody else use this app or one similar?
I am not sure what my speedy should be but hope it's ok.

 

I'm running Twixt, too. I think it is very good, even for the price.

 

Not familiar with TwixT, but I don't understand the entries for your Speedmaster. How does an average of 28.8 s/day only yield 3.6 minutes in 141 days? 28.8 s x 141 = 4060.8 s = 67.68 m.

Obviously I'm missing some key part of the equation here!

Interestingly, the data for the Railmaster looks perfectly reasonable.

 

^ Yeah that doesn't make any sense.

I personally use WatchTracker on iOS to check accuracy of my watches. You just start a timing run by tapping the screen when your watch reaches a set time. Any time you want to add a data point you just do it again and the app tracks the variance versus the atomic clock (using your previous data points). It also generates graphs of the data so you can see timing trends. Really simple and useful!

 

For the Speedy with an 861 the average daily rate should be between -1 and +16 seconds per day (1861 is -1 to +11 so a little tighter).

For the Railmaster, like any other Omega COSC rated watch, average daily rate should be between -1 and +6 seconds per day.

Cheers, Al

 

I didn't take into account that it's stopped a couple times. I used to wear it everyday but since I got the Railmaster, it splits time with the speedy

 

I might try this one as well.

 

Twixt is fairly inaccurate on small sub second watches unless you do it over a few days.

The stats over time are also meaningless if the watch stops. The over time stats both assume the watch never stopped.

 

Please explain to me why?

 

I noticed that the error with setting the middle of the subdial and the tip is greater then on a center second. Every measurement I did over a few hours was off by a 20 seconds or more, but after 24 hours it was always within 5 seconds. I did not have errors like that with my center second watches.

 

Did you take the image as parallel to the watch dial as possible? This could be a potential problem. Also when the subdial 12 o'clock and the 12 o'clock position of the main dial are not 100% in correlation to another. Otherwise I can not think of any reason why there would be such s big difference. It is no problem even if the hands are not perfectly in sync (seconds not at 0/60 when minute hand is at 0/60).

 

Yes. It due to how precise you can do things. It's easier to be off by 6 to 12 degrees which equates to a 1-2second error. Put this over 2 measurements and you get a 4 second deviation. Over 24 hours that's not huge but over 2-4 hours that shows a massive margin of error.

 

Now I am sure you are using an older version of the app (it has been for free at some point). There is no way you can be off by 6 degrees. When you put the measurement over the sconds hand it is very precice ( I know it can't be as precice at it shows with 0.01s).

 

Man you guys are fancy. I just synchronize with the US Naval Observatory time and then check back every 24 hours for a week, keeping notes on a pad.

 

Retest of my Speedy over 3 days and everything seems fine. I wind it 20 times every morning weather I wear it or not.
I also added the WatchTracker data to compare the two apps.

 

Has anyone timed the timing tools you guys are running.
How certified are these timing tools
I would love to see their certificates ( not their website speel, their actual certification )

 

I just compare my mechanical watches to either my Seiko or Pulsar quartz. If I get anything even close it's good enough for me.

 

It's dead on with my IPhone to the minute so I wanted to know where it was in terms of seconds.

 

I use Timegrapher on my iPhone. Kind of works and gives reasonable results on the fly. And you get an idea about how well regulated the movement is. Of course you need the lift angle

 

1st of Jan 2017 I set my Moonwatch to my iPhone, GMT, exactly to the second (the iphone clock is in line with my radio-controlled G-Shock and the GMT website). I have worn it every day from about 0545 until 2230, giving it a full wind to the stop every evening before taking it off and leaving it on the bedside table.
As of this morning it has gained 4 seconds in 30 days, checking against iphone. That's not 4 seconds per day, just 4 seconds.
I know this isn't a very scientific test, but quite impressive nonetheless.