Heuer timer

Canuck · Sun. 3:13pm

I discovered this in a box of scrap watches. It runs. It looks as though it might be intended as a military vehicle dash clock. The seconds hand traverses the dial in one minute, the dial at the 30 position recording indeterminate passing minutes, I’d call it sort of a “jitterbug” timer as the balance wheel operates at over 36,000 bph. The dial is marked I. F. R. Heuer T=25 MC. I’m curious. Does anyone know its purpose?

Edited five minutes later.

There are several of these available on line at present. They were apparently made during the 1970s and 1980s by Heuer, and they were apparently used as an aircraft instrument. The I F R referring to Instrument Flight Rules. What I don’t understand is how the readout refers to flying blind.

Waltesefalcon · Sun. 3:24pm

It's an aircraft timer. IFR is for Instrument Flight Rules. It's to help with navigation in low visibilty settings.

Hopefully one of our members who is a pilot can illuminate us on its practical use.

YY77 · Sun. 3:28pm

Onthedash has these on his site, he is also a member here @Jeff Stein

https://www.onthedash.com/watch/ifr/

Canuck · Sun. 3:28pm

Waltesefalcon
It's an aircraft timer. IFR is for Instrument Flight Rules. It's to help with navigation in low visibilty settings.

Hopefully one of our members who is a pilot can illuminate us on its practical use.

Maybe means you got time before meeting your maker.

MRC · Mon. 10:51am

Canuck
I discovered this in a box of scrap watches. It runs. It looks as though it might be intended as a military vehicle dash clock. The seconds hand traverses the dial in one minute, the dial at the 30 position recording indeterminate passing minutes, I’d call it sort of a “jitterbug” timer as the balance wheel operates at over 36,000 bph. The dial is marked I. F. R. Heuer T=25 MC. I’m curious. Does anyone know its purpose?

Flying under IFR is outside my experience (I was an I Follow Railroads pilot...) but I.F.R. means more than just "blind" flying. It includes taking instructions from Air Traffic Control. ATC will tell you which direction to fly, at what height, and sometimes at what speed. Often when arriving at a busy airport the aircraft may be told to "hold". This means flying at a constant height in a "race-track" pattern around a fixed point. The normal hold depends on flying four legs at a nominal one minute each, two legs are straight, two are 180 degree turns taken at a "standard rate" of 3 degrees/sec. Depending on wind direction and strength the legs may need to be lengthened or shortened to ensure that the "holding point" is passed each 4 minutes. Hence watching the large second hand is important. The minutes counter, well, I suppose it's mainly used for complaint to ATC that "We've been holding for 20 minutes and are short of fuel."

Canuck · Mon. 12:13pm

MRC
Flying under IFR is outside my experience (I was an I Follow Railroads pilot...) but I.F.R. means more than just "blind" flying. It includes taking instructions from Air Traffic Control. ATC will tell you which direction to fly, at what height, and sometimes at what speed. Often when arriving at a busy airport the aircraft may be told to "hold". This means flying at a constant height in a "race-track" pattern around a fixed point. The normal hold depends on flying four legs at a nominal one minute each, two legs are straight, two are 180 degree turns taken at a "standard rate" of 3 degrees/sec. Depending on wind direction and strength the legs may need to be lengthened or shortened to ensure that the "holding point" is passed each 4 minutes. Hence watching the large second hand is important. The minutes counter, well, I suppose it's mainly used for complaint to ATC that "We've been holding for 20 minutes and are short of fuel."

@MRC ,

Makes perfect sense. Thanks for the explanation. I can’t believe the asking prices for these on the internet.

Duracuir1 · Mon. 1:48pm

Canuck
@MRC ,

Makes perfect sense. Thanks for the explanation. I can’t believe the asking prices for these on the internet.

Glad I checked. Was gonna offer you $5000!

JimInOz · Mon. 4:56pm

MRC
The minutes counter, well, I suppose it's mainly used for complaint to ATC that "We've been holding for 20 minutes and are short of fuel."

😅

Canuck · Mon. 9:38pm

Duracuir1

Glad I checked. Was gonna offer you $5000!

I’ve seen these for sale for around $500.00, but one duffus had one he offered for over $3,000.00! If this one sold for $1,050.00, I find that to be astonishing!

MRC · Tues. 5:46am

Price new in May 1969 £22-11s (list £23-17s-6d)

Heuer timer

Canuck

Waltesefalcon

YY77

Canuck

MRC

Canuck

Duracuir1

JimInOz

Canuck

MRC

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