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Easy Way To Calculate Ohms or Wraps Needed For Alien / Clapton / Hive / Twisted Wire?

Discussion in 'Wick and Wire' started by ModBox, Sep 13, 2016.

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  1. ModBox

    ModBox Senior Member ECF Veteran

    Dec 4, 2013
    United Kingdom
    I'm looking to buy some of the more exotic wires such as alien wire but can't work out what gauge to get if say I want a coil of 4 wraps and a resistance of 0.5 ohms. I want to get wire that has a balance between surface area, ramp up time and battery life usage and tend to vape at a maximum of 50w.

    Most vendors won't give you the actual total combined gauge but will give you the resistance per meter such as:

    Kanthal A1 Type Wire - "Alien Wire" - 0.3mm x 0.8mm Flat Wrapped With 0.2mm (32 AWG)
    Measured Resistance - 6.60 ohms/m

    Kanthal A1 Type Wire - "Hive Wire" - 0.25mm + 0.25mm (30 AWG + 30 AWG) x 2 - 8.70 ohms/m

    I've been trying to work out how to input these into steam engine online coil calculator but can't figure it out.

    Thanks
     
  2. APathos

    APathos Senior Member ECF Veteran

    Jul 16, 2016
    CA USA
    Well you could figure out how many wraps give what resistance at least. i.e. Kanthal A1 using just ribbon on steam engine with 0.3 x 0.8, with 6.6 resistance is 1092.4mm. 0.3 x 0.7331 with 6.6 ohms comes out to 1001.1mm. So a single 4 wrap would be ~0.4ohms. 5 wrap would give you 0.5ohms.

    Generally the resistance is just the fat wire in the combo (close enough for me anyway, when making claptons). I assume ramp up would be the same; the core wire. It never really made me pay attention, so it can't be that different (or I didn't care enough). Twisted of the same gauge I just treat as dual coils and it comes out correct (divide a single resistance in half, close enough). The steam engine does have a Round twisted/parallel setting though.

    Not sure how you could guesstimate surface area with out lengths of the individual wires. But its more :)
     
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  3. ModBox

    ModBox Senior Member ECF Veteran

    Dec 4, 2013
    United Kingdom
    Thanks very much for your help. Ah so if I I just change the target resistance it will help me work that out. I notice you ribbon wire can allow you to put in 2 wire gauges. Where did the second 0.7331 figure come from?
     
  4. APathos

    APathos Senior Member ECF Veteran

    Jul 16, 2016
    CA USA
    No problem. To fake it, i just changed the dimensions of the wire to hit your stated "Measured Resistance - 6.60 ohms/m". So "Dimensions of wire" to the "0.3" mm x "0.7331" mm is "Results" - "Resistance wire length" of 1.0011 meters for 6.6 ohms. Then you can mess with target resistance, inner diameter, etc like you normally would.
     
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