How many is too many.....

[Rangertrix]

I have been building micro coils for quite some time but never really experimented with the many variations that are out there. Just kept it simple with basic micros wrapped on a 1/16" drill bit (1.5mm for our metric brethren).
The closest thing to experimenting I have gotten was twisted micros, which I didn't care for. Mine always popped and spit liquid too much.
Anyway, I have been building 28g 1/16" diameter duals at about .8 ohms (total) for my RDA to be used on a mech.
I would like to raise my resistance to the 1.0 to 1.2 range, so I can use my mech in 18350 mode.
I use only genuine AW batteries.
I know that .8 is within the capabilities of my AW 18350 batteries, but prefer to err on the side of caution and not push my batteries quite that hard.
I would like to wrap 28g coils, but according to my math I would have to use 15/14 wraps to achieve 1 ohm and 18/17 for 1.2 at 1/16" diameter.
I have never made a coil with that many wraps.
At what point are there too many wraps of 28g in a micro coil where it becomes self-defeating on a mech?
Thanks for any input.

 

[State O' Flux]

Run your numbers again, Ranger. Using the Steam Engine coil modeling calculator found at the end of my first sig line hyperlink - I think you'll find your wrap count calculations excessive.

For me, a Fluke meter confirmed, net 1.2Ω resistance with 28 gauge on a 1.5mm mandrel with 3mm legs... is always 10 wraps. When I need a bit less resistance than 1.2Ω, I drop down to 27 gauge, with 10 wraps for 1.0Ω, and 10 wraps of 26 gauge will provide 0.8Ω.

"Optimal" wrap counts tend to vary due to physical space, desired target resistance and wire-on-hand.
I have all gauges on hand, from 22~32, so I shoot for thickest wire that will meet my target resistance and provide at least 8 wraps, and no more than 12 wraps... with the goal of a balance between adequate surface area and acceptable heat dwell time.

 

[Rangertrix]

Run your numbers again, Ranger. Using the Steam Engine coil modeling calculator found at the end of my first sig line hyperlink - I think you'll find your wrap count calculations excessive.

For me, a Fluke meter confirmed, net 1.2Ω resistance with 28 gauge on a 1.5mm mandrel with 3mm legs... is always 10 wraps. When I need a bit less resistance than 1.2Ω, I drop down to 27 gauge, with 10 wraps for 1.0Ω, and 10 wraps of 26 gauge will provide 0.8Ω.

"Optimal" wrap counts tend to vary due to physical space, desired target resistance and wire-on-hand.
I have all gauges on hand, from 22~32, so I shoot for thickest wire that will meet my target resistance and provide at least 8 wraps, and no more than 12 wraps... with the goal of a balance between adequate surface area and acceptable heat dwell time.

Just for giggles, I tried a dual 10 wrap with 30g and it came out to 1 ohm exactly.
I downloaded vapors toolbox to check my math and it said same thing I calculated.
We're your findings done with a single coil or a dual?
I am looking for a dual coil with a net resistance of between 1 to 1.2 ohm.
I would really prefer using 28g though.
Thanks

 

[State O' Flux]

We're your findings done with a single coil or a dual?
I am looking for a dual coil with a net resistance of between 1 to 1.2 ohm.

Ah... duals. ;-)

If you want that "high" a resistance with duals in an RDA... then yeah, 29 or 30 would be a better choice.

 

[Rangertrix]

Ah... duals. ;-)

If you want that "high" a resistance with duals in an RDA... then yeah, 29 or 30 would be a better choice.

Yeah, that's kinda what I was thinking, but wanted some validation, lol.
Wouldn't mind a single coil, but the particular RDA I'm using seems to lend itself more towards duals.
Maybe I should just look into another RDA, while I'm at it, lol.
Maybe a Patriot, an IGO-W, a Nimbus........here we go again!
The wife is going to kill me before it's all over I'm sure!
Thanks for all your help.

 

[State O' Flux]

Wouldn't mind a single coil, but the particular RDA I'm using seems to lend itself more towards duals.

If you have a typical DC RDA... you have the option (or, at least, something to experiment with) of filling the space, where normally a second coil would live, and blocking the air hole on that side as well.
This would be along the lines of chamber reducers more commonly associated with genesis attys like the Pulse-G (and more recently, "reducer rings" included with some RDAs like the Vertex)... intended to concentrate and improve flavor density.

 

[Rangertrix]

If you have a typical DC RDA... you have the option (or, at least, something to experiment with) of filling the space, where normally a second coil would live, and blocking the air hole on that side as well.
This would be along the lines of chamber reducers more commonly associated with genesis attys like the Pulse-G (and more recently, "reducer rings" included with some RDAs like the Vertex)... intended to concentrate and improve flavor density.

I am currently using a Caterpillar. The top cap is very large.
I might try blocking them, but another RDA could be fun as well.
Have been considering a higher quality RDA since I purchased the Caterpillar and a Magneto, just to see if I liked mechs and dripping as well as I like my Russians and Provaris.
Maybe this is the push I need to buy something new and get in trouble, lol.
Any thoughts on a nice triple or dual post RDA, or one that lends itself to both dual and single coil builds?

 

[State O' Flux]

Any thoughts on a nice triple or dual post RDA, or one that lends itself to both dual and single coil builds?

As there tends to be quite a bit of subjectivity in the selection of vaping products... I try to avoid recommending a particular brand/model of anything, even if it's one that I prefer... unless it's clearly head and shoulders above anything else available.

With that in mind, although my RDA collection is substantial... I would not consider any one to be the very best among the rest.

I'll let others sell you on their favorites. ;-)

 

[Rangertrix]

As there tends to be quite a bit of subjectivity in the selection of vaping products... I try to avoid recommending a particular brand/model of anything, even if it's one that I prefer... unless it's clearly head and shoulders above anything else available.

With that in mind, although my RDA collection is substantial... I would not consider any one to be the very best among the rest.

I'll let others sell you on their favorites. ;-)

Ok, then let me rephrase the question.
Of your substantial collection, which dual coil design do you find yourself using the most and what RDA are you currently using?
Just what you're doing in your personal vaping, no recommendation. I assure you I research each and every purchase extensively and will only take it as food for thought.
Besides, you've helped me quite extensively on this forum and I value your thoughts and opinion.
You can PM it to me if it alleviates your concerns of posting publicly.
If not, I respect that too.

 

[State O' Flux]

You can PM it to me

 

[CloudZ]

If you want a 1.2 ohm dual coil build, I also recommend 30 gauge kanthal. A single micro with 28 gauge at that resistance should also perform acceptably. A single twisted 30 gauge coil may also work, but twisted 32 would probably do better. 0.8 x 0.1 flat kanthal works as well, but it is tougher to work with and I personally don't like it.