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Posted

The clock in the yoke not only kept good time, it added about an hour a day.

I replaced it with an Aera 560.

It keeps good time, and has a few other useful features. 

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Posted

I think most instrument shops have the capability to overhaul the clocks. If they don't they will be able to tell you where to take it.

 

I would be a bit hesitant about just buying one off EBay. Clocks like that need periodic service. Having yours serviced is probably a better long term solution.

 

BTW I like the 8 day clocks better then the electronic clocks. The sweep second hand is way better for flying procedure turns and holding patterns then trying to read digits off a computer screen.

  • Like 1
Posted

A Mooney owner I know told me that he went down to his hangar one day and caught hangar elves dipping his clock into light machine oil, like for sewing machines.

 

He avoided disturbing them and after they finished his clock worked great and has ever since.

 

Apparently they get grody after a couple of decades and the elves knew that a wash down would do the trick.

Posted

 

BTW I like the 8 day clocks better then the electronic clocks. The sweep second hand is way better for flying procedure turns and holding patterns then trying to read digits off a computer screen.

 

Oh the humanity! ...err, I mean the inaccuracy.

 

I will bet that the seconds on those old Breitling/Wakmann yoke clocks are off by at least a millisecond/second.

Posted

My POH specifically says for IFR flight:  "Clock with sweep second hand".

 

Because I am a total scoff-law, I am still using the Davtron digital clock/timer that was installed in the yoke when I bought it 17 years ago and haven't "up-graded" to a "second hand clock".  I haven't been able to get the Davtron to sweep yet, either.

 

Oh, I also use 8 ply tires on my plane!   :( 

 

Don't tell the feds.

Posted

 

I will bet that the seconds on those old Breitling/Wakmann yoke clocks are off by at least a millisecond/second.

 

That would be an 86.4 second error per day. They are much better then that.

Posted

The old clock is c

Oh the humanity! ...err, I mean the inaccuracy.

 

I will bet that the seconds on those old Breitling/Wakmann yoke clocks are off by at least a millisecond/second.

I just find my Wakmann to be just oh so cool. While I love technology just something so great about that clock.

Posted

That would be an 86.4 second error per day. They are much better then that.

My 1965 original, even when set to "slow" at the edge of its adjustment range, ran  about 10 minutes per day fast.  TEN MINUTES!  That would not be adequate for longitude measurement on an eighteenth century ship.

Posted

Wow! My original equipment 1970 clock is a 8-day mechanical windup clock. So I don't know how accurate it is long term. My longest leg to date was 4:40 difference between the red & white hands, and I didn't think to check it against my watch on landing. I always wind it and set it to my watch, then ignore my watch for the rest of the flight.

It's even on my checklist. Winding and setting it gives me something to do in the winter while I wait for the fuel from the 3-5 throttle pumps to vaporize before turning the key to start.

  • 2 weeks later...
Posted

I have the original 8 day clock on my 68C.  It never worked from the time I bought it, but I finally got tired of looking at it and took it out.  Took it to a local jeweler in Tulsa (http://www.jewelsbyjames.com/) and he repaired ti for less than a new one would have cost.  There was a delicate shaft that had broken due to a shear force of some kind that he had to remake.  I asked him if a particularly rough landing might have caused it and he seemed to think it did.  Probably occurred years before I bought her when she was bellied in.

 

Robb

  • 2 weeks later...
Posted

LASAR offers a Davtron 800 series with a custom bracket specifically designed for vintage Mooney yokes. I can't find the receipt, but I don't think it was terribly expensive (by aviation standards). It is wired to the ship's dimming buss and has provisions for aural alarm. Wiring diagram attached.

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Posted

A fine watch (which is what the wind up clocks are) should be serviced every five years or so. You complain about a clock that probably hasn't been serviced in 40 years.

 

Our 67F came with a Berco stop watch. Never been serviced, never missed a beat.  I will compare it to the davtron once it warms up enough for me to install it

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