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Cox Engine Glow Head Voltage? Empty Cox Engine Glow Head Voltage?

Post  Woody Tue May 10, 2022 5:52 pm

I have read that the voltage should not be above 1.5V.
My Cox glow clip arrived in the post today so tests were carried out on my massive collection of THREE Cox engines...( Cox Medallion on the way from UK ) ( Got to start somewhere But I have grown to really like these beautifully made little engines and they are cheap on glow fuel at their size).
With a bench power supply set to 1.5V all three heads did not glow .
With it cranked up to 2V I had a glow on all three.
What exactly represents a ( Glow)?......when it goes red?
Thanks in advance.
Woody
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Post  706jim Tue May 10, 2022 7:24 pm

Did you actually measure the voltage at the plug when it was connected; that is with a separate voltmeter than you have on the power supply?

2.0 volts will usually burn them out if that's what you actually are getting.
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Post  Woody Tue May 10, 2022 8:14 pm

706jim wrote:Did you actually measure the voltage at the plug when it was connected; that is with a separate voltmeter than you have on the power supply?

2.0 volts will usually burn them out if that's what you actually are getting.

I measured the voltage from the power supply which registered 3V to make it glow red........
then measured it at the glow head as you suggested and it reads just under 1.5V and glows nice and red.
Thank you for that but now I am puzzled...
If two D cells are wired in Parallel we get an output of 1.5V right?
By the time it is measured at the glow head then surely, like my power supply measuring 1.5V, it will not be enough to make the glow head glow red ( ie...1.5V)?
Or are the Cox D cell battery holders wired in series giving an output of 3V and when measured at the glow head we get 1.5V?
Thank you so much for bringing this to my attention.
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Post  706jim Tue May 10, 2022 9:02 pm

The length and gauge of the wire leads have a considerable effect on voltage drop. In fact, some modelers use a length of wire to intentionally reduce voltage from a 2 volt wet cell to 1.5 volts at the plug. So voltage drop is what I think you're seeing particularly if the wires are thin and/or long. As fire as I know the Cox battery holders were wired in parallel to give 1.5 volts.
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Post  davidll1984 Tue May 10, 2022 9:30 pm

I use just one sub c batry and it work Fine it just light longer wit two batry in parallèle positif To positive négative To négative ... To never over volt i use sub c rechargeable batry as its 1.2 v it cant over volt glow plug but in the Canada cold has difrent meaning here the word cold takes on another meaning and somtime its hard To light that glow plug so we use 1.5 v c batry a new 1.5 work bether than a rechargeable 1.2v battry
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Post  Levent Suberk Wed May 11, 2022 11:45 am

Use short battery cables. It works. Very Happy
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Post  Woody Wed May 11, 2022 5:26 pm

Thanks for your answers. They were very helpful.
I checked the Voltage out from the bench power supply at circa 3V and at the plug end it was 1.5V so all okay.
Thinking about it there will be a voltage drop as it has to travel through the wire ( Not so massive) but by the time it heats the filament to glow red then of course that explains a voltage loss?
Think I may be right there but will stand correction.
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Post  Levent Suberk Wed May 11, 2022 5:29 pm

Woody wrote:Thinking about it there will be a voltage drop as it has to travel through the wire ( Not so massive) but by the time it heats the filament to glow red then of course that explains a voltage loss?
Think I may be right there but will stand correction.

Yes, right. Very Happy
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