Glow Engines Discuss RC glow engines

ANYBODY know how to bring a LiFe 3.3v cell down to 1.5v~1.6v for onboard glow heat?

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Old 12-01-2013, 08:27 PM
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psgugrad
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Default ANYBODY know how to bring a LiFe 3.3v cell down to 1.5v~1.6v for onboard glow heat?

I posted this question a week ago in the battery forum and no one answered...surely I can't be the only guy who wants to do this. Would I use a diode? a regulator? resistor? Any advice appreciated.

PS: I experimented by simply placing a 2nd glow plug in the line and a 1000mah 3.3v cell ran them for 15 minutes...REALLY hot...engine ran like a sewing machine. If I had something to cut the output voltage in half, would the cell run 1 plug for 30 mintues?

Thanks
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Old 12-02-2013, 03:34 AM
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You can use a regulator curcuit. I intend to that for on board glow as well. I bought a DIY regulator kit from an electronics store here. You should be able to get the same thing from radio shack where you are. It is realy simple to build. A few components to solder and you,re ready.
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Old 12-02-2013, 04:32 PM
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Quote:
Originally Posted by psgugrad View Post
I posted this question a week ago in the battery forum and no one answered...surely I can't be the only guy who wants to do this. Would I use a diode? a regulator? resistor? Any advice appreciated.

PS: I experimented by simply placing a 2nd glow plug in the line and a 1000mah 3.3v cell ran them for 15 minutes...REALLY hot...engine ran like a sewing machine. If I had something to cut the output voltage in half, would the cell run 1 plug for 30 mintues?

Thanks
A linear regulator type will act as a variable resistor to keep the output at 1.5V (or whatever it's set to) and disipate the rest of the volts x current as watts (heat) for no real efficiancy gain.

A switching type regulator will turn the full voltage on and off really quickly with the ratio of on-off determining the average voltage. For something as dumb as a glow plug a 555 timer circuit set to switch at a coupled of hundred hertz with a duty cycle about 40% would do just fine..
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Old 12-03-2013, 03:53 AM
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BJR, could you please elaborate on this curcuit? Do you perhaps have a schematic drawing? I went to the elctronics store and they gave me a linear regulator kit but made no mention of the swicthing mode regulator. This sounds like a better solution.
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Old 12-04-2013, 10:00 AM
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Hi!
Why do you want on-board glow?? It's not needed on any two or four-stroke glow engine if you set the carb right, mount the tank according to the tank mounting rule and use the correct fuel andf glow plug.!
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Old 12-04-2013, 06:07 PM
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How about this On-Board Glow Igniter 1.5V 3A
http://www.hobbyking.com/hobbyking/s..._1_5V_3A_.html

On-Board Glow Igniter 1.5V 3A
Specs:
Input: 6v~23v
Output: 1.5v 3A
Dimensions: 22.9x20.3x7.6
Weight: 8g

Ken
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Old 12-05-2013, 10:22 AM
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I would just simply use a on board glow ignitor and two LiFe cells in series. I have a couple of planes using that setup already.
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Old 12-05-2013, 12:04 PM
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Ok but how do you get the voltage down?
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Old 12-05-2013, 06:20 PM
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You could rip the innards out of a power panel.
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Old 12-06-2013, 06:00 AM
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That crossed my mind!
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Old 12-06-2013, 11:55 AM
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Quote:
Originally Posted by psgugrad View Post
Ok but how do you get the voltage down?
Well the onboard glow ignitor has its own electronics built in that reduces the voltage down to a safe level for the glow plug. They usually include a circuit for measuring the current flow and adjust it as well, plus they include a circuit that allows you to set the turn on based on the throttle position too.

You can also perform a GOOGLE search for "glow plug igniter schematic" and see if any of those methods that show up will work for you too. Unfortunately some are from another forum though.
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