I did a nano dragon coil but a single one and that is producing mad vapour on 30 watts but it's a draining my battery badly
I looked at the dingle coil you put on steam but it says heat flux 45 but I only got 30 watts?
like I said I'm happy with the dragon coil on 30 watts but battery not lasting AT ALL!
In the bottom left corner of the steam engine, click on "How it works". In addition, the example is slightly off. The 45 is the wattage utilized (it was left there from a previous build of mine). Obviously, you can only do 30W max. However, to hit the sweet spot of your device, the coil(s) should have 1.3 Ohm. That gives you the best ability to adjust the power, without straining the circuit board.
With the wire gauge you have, I only recommend a single coil.
If you want to stick with the dragon coil. Utilize the link I posted above, enter the ID of your build (top right), and it will show you the number of wraps you'll need. At 15W the heat flux would be 205 mW/mm square. Which is IMO, pretty high.