For anyone that's interested I did a little watch winding experiment with my SKX007. 5 consecutive tests to see how much shaking is required to wind up a 7s26 movement.
Important Notes:
To wind the watch I moved it horizontally (dial facing upwards) in a small arc of about 12" end to end. I shook the watch (this is important) so that it completed about 2 full revolutions of the arc every second (quite quickly). I could hear and feel the rotor in the watch continuously spinning. I've noticed in subsequent tests that if I shake the watch slower or in a way that the rotor occasionally stops moving at any time during winding I get significantly less charge time.
Kode:
[B]Test 1 [/B](watch completely stopped)
Time on watch 8:21pm. Wound the watch for exactly 30 seconds.
Watch stopped at 2:12am.
[B]~ 5hrs 51m charge.[/B]
[B]Test 2 [/B](watch completely stopped)
Time on watch 2:12am. Wound the watch for exactly 30 seconds.
Watch stopped at 10:22am.
[B]~ 8hrs 10m charge.[/B]
[B]Test 3[/B] (watch completely stopped)
Time on watch 10:22am. Wound the watch for exactly 30 seconds.
Watch stopped at 5:12pm.
[B]~ 7hrs 50m charge.[/B]
Hey
[B]Test 4[/B] (watch completely stopped)
Time on watch 5:12pm. Wound the watch for exactly 30 seconds.
Watch stopped at 12:42am.
[B]~ 7hrs 30m charge.[/B]
[B]Test 5[/B] (watch completely stopped)
Time on watch 12:42am. Wound watch for exactly 30 seconds.
Watch stopped at 7:21am.
[B]~ 6hrs 39m charge.
[SIZE=4]Average charge time for 30 seconds winding: ~ 7hrs 12m.[/SIZE][/B]
Conclusion:
From my tests the average charge time for 30 seconds shaking (using the described method) comes to around 7 hours and 12 minutes. Therefore about 3 minutes shaking should see the watch very close to being fully charged.
What I've found in subsequent tests is that if I change the winding "technique" I get significantly less charge time. The most efficient way to charge the watch seems to be to have the rotor spinning continuously throughout the winding arc. Think of trying to spin water around the bottom of a bucket, if you get it right the water just swishes around perfectly. If you stop the motion for a second or change direction slightly it messes the whole thing up.
The next test I have planned is to actually count the number of revolutions the rotor makes during winding and then determine charge time per rotor revolutions. But that's for another day.
Enjoy.
