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Stupid dual coil question?
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Finster Offline
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Post: #1
Stupid dual coil question?
So I want to build a dual coil for my Kanger subtank mini. Here is my stupid question. I know when you build dual coils you cut the ohms in half so a 1.0 ohm would really be a .5 sub ohm. First, will my device (using a I STICK 30watt) read .5 ohm or will it read 1.0 ohm? Secondly and perhaps an even dumber question. Does cutting the ohm number in half pertain to a dual coil that is made from the same strand of wire? In other words, it's not really a "dual coil" but a "parallel coil".

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11-06-2015 03:22 PM
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Don Offline
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Post: #2
RE: Stupid dual coil question?
With dual coils connected in parallel, a pair of 1 ohm coils will measure and display as 0.5 ohms. Will an iStick 30W fire at 0.5 ohms? I  don't know. If it is all the smell piece of wire, it depends how it is attached. It could be either 2 or 0.5 ohms. If connected as intended it will be 0.5 ohms. 

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11-06-2015 03:39 PM
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Finster Offline
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Post: #3
RE: Stupid dual coil question?
(11-06-2015 03:39 PM)Don Wrote:  With dual coils connected in parallel, a pair of 1 ohm coils will measure and display as 0.5 ohms. Will an iStick 30W fire at 0.5 ohms? I  don't know. If it is all the smell piece of wire, it depends how it is attached. It could be either 2 or 0.5 ohms. If connected as intended it will be 0.5 ohms. 
Yes, an I stick 30 will fire at .5 ohms. no problem. I always love your advice and heed it Don but you lost me a little with your answer. So a dual coil made from the same strand of wire made to be 1.0 ohm with one side on the positive terminal and the other lead on the negative terminal would read what? If you have a minute, check out this video. This is exactly what I want to do.
 https://www.youtube.com/watch?v=HIBlGXmZoNM what should this read for me? The reason I ask is because I don't want to get below .5 for fear of battery damage.

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11-06-2015 03:53 PM
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Almost Jaded Offline
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Post: #4
RE: Stupid dual coil question?
Finster - what you are describing is not a "parallel" coil, it is a "series coil".  This will not divide the resistance in half, it will double it.  

Think of it like this - the electricity moves from one post to the other, negative to positive.  If the coils are all one piece of wire, it has to flow through the entire thing from one end to the other.  Ohms are a measurement of resistance - and the longer the piece of wire, the more resistance.  This is called "series", because the power goes through each part in series.

If you have two coils with separate connections to the + and - posts or with their ends twisted together into one on each post - you have just cut the "distance" in half AND turned a 1 lane road into a 2 lane - effectively doubling the size of the wire, and therefor reducing the resistance.  This is called "parallel", because the electricity flows through them simultaneously, in parallel.

So a single strand of 28 awg is twisted into a coil that makes 1.2 ohms.  Now you add twice as many twists, doubling the length of that single strand - you have 2.4 ohms.  Cut that long double twisted strand in half, and connect the 4 ends to the posts, 2 on each side - you now have .6 ohms.

The i30 will fire down to .4 ohms BTW, .5-.8 is a good zone to be in with it.

hope this helps.

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(This post was last modified: 11-06-2015 04:14 PM by Almost Jaded.)
11-06-2015 04:12 PM
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Finster Offline
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Post: #5
RE: Stupid dual coil question?
(11-06-2015 04:12 PM)Almost Jaded Wrote:  Finster - what you are describing is not a "parallel" coil, it is a "series coil".  This will not divide the resistance in half, it will double it.  

Think of it like this - the electricity moves from one post to the other, negative to positive.  If the coils are all one piece of wire, it has to flow through the entire thing from one end to the other.  Ohms are a measurement of resistance - and the longer the piece of wire, the more resistance.

If you have two coils with separate connections to the + and - posts or with their ends twisted together into one on each post - you have just cut the "distance" in half AND turned a 1 lane road into a 2 lane - effectively doubling the size of the wire, and therefor reducing the resistance.

So a single strand of 28 awg is twisted into a coil that makes 1.2 ohms.  Now you add twice as many twists, doubling the length of that single strand - you have 2.4 ohms.  Cut that long double twisted strand in half, and connect the 4 ends to the posts, 2 on each side - you now have .6 ohms.

The i30 will fire down to .4 ohms BTW, .5-.8 is a good zone to be in with it.
 Thanks Almost Jaded and Don for your replies. This is what I thought and it makes sense. I just wanted to make sure I was correct and wasn't missing something before I had a battery vent in my hand or worse. Sorry, my Bad for calling it parallel. I should have known better. I was having a brain fart and over thinking things.

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11-06-2015 04:17 PM
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Almost Jaded Offline
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Post: #6
RE: Stupid dual coil question?
I wasn't meaning to nitpick your choice of words, I just wanted to make sure that's what you really meant, lol.

The i30 should never be in danger of venting, short of the battery being penetrated from the outside and shorting internally.  It'll shut itself down before it gets anywhere near that level from use, and will flash a warning and refuse to fire if you run a coil that's below its minimum resistance.  

Remind one liberal per day, that laws affect only the law-abiding.
(This post was last modified: 11-06-2015 04:26 PM by Almost Jaded.)
11-06-2015 04:25 PM
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Finster Offline
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Post: #7
RE: Stupid dual coil question?
So after all of that, I decided to try a chimney coil anyway. It's a bit tricky since everything is so damn small and I have giant gorilla hands. Built it at a .7 ohm and it makes a great cloud at 20 watts 3.7 volts but the flavor isn't there yet. Maybe because it's new?  

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11-06-2015 05:45 PM
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Whiskey Offline
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Post: #8
RE: Stupid dual coil question?
Moving this from DIY area to coil areaSmile
11-06-2015 07:44 PM
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Finster Offline
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Post: #9
RE: Stupid dual coil question?
(11-06-2015 07:44 PM)Whiskey Wrote:  Moving this from DIY area to coil areaSmile
Sorry brother, following me around is a full time job. Sarcastic_hand

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11-06-2015 10:23 PM
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Finster Offline
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Post: #10
RE: Stupid dual coil question?
Anyway, I gave up on the Chimney coil. The vape and airflow was awesome but the flavor never came around. I made a dual coil in series. Nice cloud (not as good as the chimney) and better taste. Still not as good as a single coil at .5 with the right amount of cotton. Maybe I'm doing something wrong? Vaping my series at 20 Ohm 4 volts. Not getting great draw but there is a bunch of stuff in the way. To_pick_ones_nose2 

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11-06-2015 10:34 PM
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