Rogue Rda Build

[Rhyno636]

How do you build your Rogue rda? Surprisingly, I'm getting the best flavor with the coils low and away from the top air flow. I use dual 3mm coils of 26g with about 8 wraps which gives me about .5 ohm. I run this at 80 watts and it's just lovely. Thoughts?

 

[State O' Flux]

Not to put you on the spot, but more to clarify and correct any typos etc - should someone want take your build data at face value - you might want to double check those numbers, Rhyno. The math doesn't work out to 0.5Ω, for the specs stated.

Per SE* - dual parallel coils @ 8 wraps (7.59) of 28 gauge Kanthal A1, with a 3mm mandrel (combined leg length calculated at a typical 8mm net)... would provide a net resistance of 0.85Ω.
You'd need 5 wraps (4.67) for a 0.55Ω net resistance, or... your 8 wraps - but on a 1.5mm mandrel.

"Thoughts?" Running at 80 watts, your "heat flux"* (for 28 gauge 0.85Ω duals) is a very warm 418 mW/mm2. Even hotter at your stated 0.5Ω target resistance... 710 mW/mm2. "Heat Capacity"* and "Coil Leg Power Loss"* (for 0.85Ω) are OK at 25 mJ/K and 8.4%, respective.

As a point of reference and perspective... an unregulated 18650 mech (@ 4.2v) will discharge 35 watts 8.4 amps to a 0.5Ω DPC build, for a warm HF of 311 mW/mm2.

*If you've an interest in learning more about the terms mentioned above... click the first two hyperlink/siglines below.

Cheers

 

[Rhyno636]

Not to put you on the spot, but more to clarify and correct any typos etc - should someone want take your build data at face value - you might want to double check those numbers, Rhyno. The math doesn't work out to 0.5Ω, for the specs stated.

Per SE* - dual parallel coils @ 8 wraps (7.59) of 28 gauge Kanthal A1, with a 3mm mandrel (combined leg length calculated at a typical 8mm net)... would provide a net resistance of 0.85Ω.
You'd need 5 wraps (4.67) for a 0.55Ω net resistance, or... your 8 wraps - but on a 1.5mm mandrel.

"Thoughts?" Running at 80 watts, your "heat flux"* (for 28 gauge 0.85Ω duals) is a very warm 418 mW/mm2. Even hotter at your stated 0.5Ω target resistance... 710 mW/mm2. "Heat Capacity"* and "Coil Leg Power Loss"* (for 0.85Ω) are OK at 25 mJ/K and 8.4%, respective.

As a point of reference and perspective... an unregulated 18650 mech (@ 4.2v) will discharge 35 watts 8.4 amps to a 0.5Ω DPC build, for a warm HF of 311 mW/mm2.

*If you've an interest in learning more about the terms mentioned above... click the first two hyperlink/siglines below.

Cheers

I edited my post to show 26g instead of 28g. That was a simple typo.

Not to put you on the spot, but you didn't include a hyperlink/ sigline below.
But I personally don't give a flux.

Cheers

 

[manson]

i'll just have a drink and a vape, cheers

 

[Obsidian...]

Odd I didn't see Rhyno say he used dual parallel coils, just duals (as in two). So why are you talking about dual parallels Flux? Did I miss something here???

 

[State O' Flux]

Odd I didn't see Rhyno say he used dual parallel coils, just duals (as in two). So why are you talking about dual parallels Flux? Did I miss something here???

No Obsidian, you didn't miss anything.
Dual parallel coils are the most common and likely build. If you were to run the numbers for a serial dual coil at 0.5Ω (using the corrected to 26 gauge wire) at 80 watts... you'd have a ridiculous build, with only 2 wraps and a tiny 18.06 mm2 of surface area... with a heat flux over 1400 mW/mm2, and a leg power loss of 35% or more, depending on leg length.

I edited my post to show 26g instead of 28g. That was a simple typo.

I figured as much. The math for 26 gauge works nicely. My typical (starting) heat flux runs in the 330~370 range as well... although I have to run a lower resistance to obtain it, as I run mech mods only.

One of these days, I'll have to break down and get a high output APV... so, like you, I can run milder resistances, thick wire, and still obtain my prefered heat flux.

Not to put you on the spot, but you didn't include a hyperlink/ sigline below.
But I personally don't give a flux.

Cheers

The siglines: "Steam Engine - Coil modeling Calculator", "Steam Engine User Guide" and "The Bigass Mech and RBA info links page" are the hyperlinks... although I've been told that with many smart phones, the hyperlink function doesn't work.