Not saying this is right, it’s just what I’ve observed since I started making coils 9 months ago for two different MTL tanks (Siren 22 and Ubertoot UTA2) and two different DL tanks… (UD Bellus and Serpent Mini)
Spaced coils just ‘make sense’ to me. I mean, there’s plenty of wick/liquid area available to supply each strand of the coil, and because of that, the element won’t ‘burn’ the juice quite as much as a bunch of coils touching each other. And ‘exposed’ wires have greater surface area to heat the juice, compared to wires ‘nestled’ against each other.
But I got the shits reading all these people getting at least a week, sometimes weeks, out of a coil, when I was getting four days max.
So I experimented with contact coils and immediately got a week out of a coil, with 9.9/10 flavour compared to 10/10 flavour. And I found I could run a couple of Watts lower than a spaced coil for the same flavour and cloudage. Maybe there’s heat ‘sharing’ with the wires touching each other so we don’t need so many Watts input for the same heat output? (is this heat-flux?)
Anyways - I’m sticking with contact coils for now (even though in some ways it doesn’t ‘make sense’…)