Ferrari Mailing List: Re: No Ferrari Content - Waltham Aircraft Clocks.

[Stephen Sherman (stephensherman44]

This watch question reminds me in either 88 or 89, we were at a F1 motorcycle race at Laguna Seca.

Cycle New had an ad for BMW motorcycles that if you brought this ad to a dealer you would be given a BMW watch. We went to a BMW motorcycle dealer and no problem they gave us a watch.

When we got to the car checked the watch and it was not running, could not find where the battery went to check it, sometime to save the battery they have a piece of plastic to keep the battery fresh.

So I went back in side and asked, no problem, HE JUST WOUND THE WATCH!

Stephen

On Mon, Sep 26, 2016 at 7:32 PM, Hunter Schultz <hunter.schultz [at] gmail.com> wrote:

Very cool clock. Probably an A-13A model. Standard issue for military aircraft for a long time.

As a watch enthusiast (ask me about my Citizen Electronic running at 43.200 beats per hour) I can safely say that an automatic version would more complicated to engineer for an aviation environment and to mil spec. That and the rotor would be rather hard pressed to keep turning to wind the mainspring. Can you say barrel roll? 

Anyway, as for the 8 day power reserve for the mainspring, that makes sense from an operational standpoint. You had to set it before each flight so it makes sense to have it running for longer periods of time between missions. Less fiddling with it when a pilot got in the aircraft to do their pre-flight checks.

I suspect that while they were fairly accurate per se, they did need to meet certain performance standards. So, another reason for the 8 day power reserve is that a mainspring powered clock (or watch) will lose accuracy during the last portion of the power reserve -- in this case the last 24 to 48 hours.  

Get it serviced and mount it. great conversation piece.

On Mon, Sep 26, 2016 at 5:33 PM, Doug & Terri <dnt [at] dock.net> wrote:

Ok – we’re a pretty smart bunch – and I am stumped. I just got a Waltham clock from a military aircraft.  Looks similar as one from an SR71.  Surprise surprise – eight day WIND UP clock with a stop watch button.  Here are the questions:  1)Why is it a wind up; and, 2) why is eight days?

Onward

DOUG

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