Here's my contribution.
Been messing around with vertical nano dragon/volcano coil builds on my Kayfun 3.1 clone the past few days. I think I've got it figured out pretty well.
Using 28 ga Kanthal A-1, I did a 10 wrap coil around an 18 ga blunt tip syringe needle, and installed it vertically in the Kayfun:
Test firing, she glows really nice and even from the middle outward and quite quickly:
Video of it glowing up:
YouTube
CVS Sterile Rolled Cotton, strung through the positive (top) leg:
Movember, anyone? It looks like a handlebar mustache. LOL.
I wrapped the cotton around the coil to ensure it stays moist during firing:
After playing around with it for a few days, I figured out the cotton can't be packed too tight or too loose here. I can't describe it exactly, all I can say is that the density is "middle". Too tight, and it can't pass juice to the coil quick enough (which results in burning), too loose and it'll end up flooding the coil which results in hot spitting juice up the chimney and into your mouth.
Next, the evaporation chamber goes on, and I pack some cotton wick down the sides to reach down to the juice channels. Again, similar density to how I've wrapped the cotton around the coil. "Medium" density. You want it loose enough to quickly draw juice upwards, and not so tight that it chokes wicking ability. If it's too loose, it'll wick too much juice upwards and the excess juice will get dumped on to the deck which ends up running down the air hole, leading to gurgling.
Finally, some very lightly placed cotton on top, covering the coil posts and the cotton at the bottom of the chamber. Pressed down enough to make contact with the cotton at the bottom of the deck/evaporation chamber, but kept loose enough to draw juice upwards quickly and feeding the cotton that's wrapped around the coil. Keep it light and fluffy as much as possible! The tighter cotton that's wrapped around the coil will prevent juice from over-saturating the coil, which would lead to flooding and sputtering.
Juiced up:
Now let's test it:
YouTube
Look at that... lots of vapor just firing out, with zero sputtering.
Fully assembled, let's see how she performs!
WOW! I absolute LOVE the flavor and vapor production of this setup!
Those few hauls for that video left me dizzy and nic-sweating on 6mg HHV Cinful Pear 100% VG.
(Don't mind my little Schnauzer chattering away in the background. He's quite the vocal little boy.)