That actually made my brain click in. Thanks!
ooh look, he's got massive eyes.
Because I'm at work and I'm bored....
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Which makes @zouzounaki correct, it's a 4 fold increase in area every time you double the diameter.
I don't really understand why it's not pi. But it isn't.
what does “semi-tube mod” even mean? it’s a shame, the mod could have been decent if they hadn’t inscribed that stupid black letter style text on it.
Dunno mate. I think they're using "semi" to describe that its not fully power adjustable or by-pass battery voltage output only, but somewhere in the middle because you can select 3 different voltage outputs.
Or we shoved an old kanger evod in a tube. Looks reet nice and shiny.Well, it does sound better than 'Cheap very limited adjustable voltage board designed for a pod system' I suppose.
Just what I was thinking.area is pi * d^2 / 4
increase_mult * pi * d^2 / 4 = pi * (2d)^2 / 4 = pi * 4d^2 / 4 = 4 * pi * d^2 / 4
increase_mult = 4