Log in
Search
Latest topics
» Cox C/L Helldiver w/parachute guy - disassembly, lots of partsby getback Today at 5:18 am
» Lathe machining Help needed please?
by aspeed Yesterday at 10:26 pm
» After 84 years, seven months and 15 days the Wen Mac P-38 is here
by andrew Yesterday at 5:07 pm
» My first Cox .049 engine.
by MauricioB Yesterday at 4:28 pm
» Cox Pinto question
by Levent Suberk Yesterday at 2:05 pm
» Keil Kraft Phantom Scratch build from start to flying.
by Levent Suberk Yesterday at 1:20 pm
» "DOCTOR DIESEL" Eric Clutton Passed Away
by sosam117 Yesterday at 1:17 pm
» 2-56 X 1 1/4" Unattainable?
by GallopingGhostler Yesterday at 10:24 am
» Carl Goldberg Skylane 42
by GallopingGhostler Fri May 20, 2022 10:24 am
» wanted - cardboard box or repops
by Kim Thu May 19, 2022 9:17 pm
» Big box arrives and pretty sad Prop Rod
by GallopingGhostler Thu May 19, 2022 9:13 pm
» Wanted P-40 landing gear plastic part
by latole Thu May 19, 2022 10:03 am
Cox Engine Glow Head Voltage?
Page 1 of 1
Cox Engine Glow Head Voltage?
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.
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- Silver Member
- Posts : 81
Join date : 2022-04-20
Re: Cox Engine Glow Head Voltage?
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.
2.0 volts will usually burn them out if that's what you actually are getting.
706jim- Gold Member
- Posts : 325
Join date : 2013-11-29
Re: Cox Engine Glow Head Voltage?
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.
Woody- Silver Member
- Posts : 81
Join date : 2022-04-20
Re: Cox Engine Glow Head Voltage?
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.
706jim- Gold Member
- Posts : 325
Join date : 2013-11-29
Re: Cox Engine Glow Head Voltage?
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
davidll1984- Diamond Member
- Posts : 1899
Join date : 2020-02-12
Age : 37
Location : shawinigan
Re: Cox Engine Glow Head Voltage?
Use short battery cables. It works.

Levent Suberk- Diamond Member
- Posts : 1491
Join date : 2017-12-24
Location : Turkey
Re: Cox Engine Glow Head Voltage?
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.
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.
Woody- Silver Member
- Posts : 81
Join date : 2022-04-20
Re: Cox Engine Glow Head Voltage?
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.

Levent Suberk- Diamond Member
- Posts : 1491
Join date : 2017-12-24
Location : Turkey

» Glow Head Caddy for TD .010 Engine
» Cox .049 glow head for McCoy engine?
» AP06 Aero Engine w/ Cox glow head
» Cox. 049 Surestart engine's glow head unscrewing
» Tall engine and glow head fins
» Cox .049 glow head for McCoy engine?
» AP06 Aero Engine w/ Cox glow head
» Cox. 049 Surestart engine's glow head unscrewing
» Tall engine and glow head fins
Page 1 of 1
Permissions in this forum:
You cannot reply to topics in this forum