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Prof Reviews the Derringer RDA from Praxis

Discussion in 'E-Cigarette APV Reviews' started by prof beard, Mar 13, 2015.

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  1. prof beard

    prof beard Super Member ECF Veteran

    Mar 29, 2009
    Stafford UK
    Why


    I was looking for a 22mm RDA that was "even smaller" than things like my Hobo to use with my Petit Gros...


    What did I get?


    The Derringer came reasonably quickly and on opening the parcel, I found two zip bags. The first contained (yet another) hex key and a couple of very small spare grub screws:


    [​IMG]


    The other bag contained the Derringer. The cap is clearly branded:


    [​IMG]


    And the base is plain:


    [​IMG]


    This view shows one of the airflow slots with the maximum airflow through it set:


    [​IMG]


    Here is the inside of the cap:


    [​IMG]


    The inner (and repositionable) airflow ring is removable from the deck:


    [​IMG]


    The deck has integral negative posts, and all the posts have slots rather than holes for the wires:


    [​IMG]


    Building the Derringer


    The hex screws work well. I made a coil using 0.25mm three stranded machine twisted Kanthal which tested out at 0.68ohms. I chose this single coil build as I was intending to use the Derringer in my Petit Gros with a 10 amp 18350 battery:


    [​IMG]


    [​IMG]


    I then wicked the coil with Japanese cotton:


    [​IMG]


    As this was a single coil build, I positioned the inner airflow ring with the central three holes next to the coil:


    [​IMG]


    On replacing the cap, I set the draw to a fairly tight setting. The setting shown is about as tight as it is possible to get the draw, as closing it further resulted in one of the holes starting to get exposed in the other cap slot. As the inner ring is separate, it might have been a good idea to supply separate rings for dual and single coil builds...


    [​IMG]


    Conclusion


    Here is the Derringer on my Petit Gros:


    [​IMG]


    A small package! As built, the Derringer is supplying a very good "regular mouth to lung" vape and I will declare myself happy with it...
     
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