so i have been messing around with a number of other RDA style devices
i have narrowed down what makes this combo so efficient.
keep in mind that this device only hits 11 watts at peak.
1: Twisted Kanthal, the surface area is tremendously increased when twisted in the manner previously shown.
this means more contact with wick and thus more vapor. but this does not lower the resistance all that much, yes the resistance is less with twisted kanthal when compaired to a single strand of kanthal but only by .25 ohms per inch. so this means your get much more surface to wick contact with out lowering the resistance a lot.
2: Chamber Volume, using the exact same combo of wick and twisted wire in a much larger chamber produces much less vapor because the vapor is not condensed as much. you would need to inhale much faster and harder to achieve the same amount of vacuum when comparing a larger chamber to a smaller chamber and it still would not condense the vapor as much.
3: Air Flow, the 2.5 MM (drilled out) air flow hole seems to be the best for this combo of wick and wire. i find this airflow hole on this size of chamber to be optional for
coils in the 0.8 - 1.5 ohm range.
4: temperature, not sure of the exact temp this coil is hitting but its more than enough to make vapor but not too much. let me explained. i setup a duel coil rig (nimbus) using this method and 28 gauge twisted kanthal and 3 2mm wicks. it was about 30 watts per coil. the vapor was pretty darn warm but not burnt. also there was not a lot of visible vapor, more than say a single 1.5 ohm coil but less than a single .8 ohm coil. this had me thinking. after doing some research the only thing i could think of was that i heated the VG to the point that it was so atomized / vaporized (the particles got so small) that you could no longer see them.
even though i now own a number of other RDAs this mini octopus (and other similarly sized single coil drippers) is still my go dripper. its simple, easy and effective. why make 2 coils (duel coils) when i can make one coil (single coil) that produces 3 times the vapor of the duel coils.
currently im using the same mini octopus with twisted 30 gauge, 3/4 wrap on 2 strands of 2 mm silica about .8 ohms (22 watts at peak) with the same 2.5 mm air hole on an 18650 mech and the vapor production is just phenomenal!
