I really, really like running dual coil setups for my daily driver. But I also want to go sub-ohm with it. I was wondering if it would be possible to build like a .8 dual coil on the Billow? I'm asking because right now I'm using 28g wire and it takes forever to heat up. Or what route should I really be going for good sized clouds on the Billow?
I don't own a Billow... but isn't it designed for dual parallel
coils?
If you want an optimized build for your
rta, click the first and second sigline links below... with Steam Engine, you can build for an optimal "heat flux", "heat capacity" and a low "leg power loss".
The first reference is that actual coil radiant heat, expressed in milliwatts per millimeter of coil surface area... squared.
To have a better understanding of those values, the second sigline is a SE user guide.
For example, if you want about 1/3rd of your available 150 watts... your best build for a 300 mW/mm2 heat flux, with 54 watts would be:
A target of 0.8Ω net resistance using your desired 28 gauge Kanthal A1 wire (89.4mm length per wire - terminal to terminal), wrapped 10/9 on a 2.0mm mandrel with a
total leg length of 10mm (4 X 2.5mm legs).
The result would be a 300 mW/mm2, 24 mJ/K and 11% leg loss. If you want to go with a higher wattage, I'd suggest using a thicker wire
