VapeClub - Derringer RDA

[Alex]

I am seriously impressed with this device. It's the second day now, and everything is working great. The size of the derringer is perfectly suited for a Bottom fed atomizer. It drains very well, and is a pleasure to use. The only modification I've done is to use a longer drip tip. One of my own creation btw Well done @JakesSA on an excellent mod for us Reo fanatics.

 

[JakesSA]

Many thanks @Alex. I've ordered more of the stainless steel centre pin unit with stainless cap only, rather the devil I know than the devil I don't.

 

[Alex]

Many thanks @Alex. I've ordered more of the stainless steel centre pin unit with stainless cap only, rather the devil I know than the devil I don't.

Stainless steel is by far the best metal to use in an atomizer. Simple to keep clean, and more importantly stronger threads.

 

[JakesSA]

The first few have now shipped, next lot should be here Monday/Tuesday.

 

[VapeSnow]

@JakesSA who made this clone?

 

[Andre]

@JakesSA who made this clone?

That is what one calls a loaded question.

 

[VapeSnow]

That is what one calls a loaded question.

Haha dont like buying clones but authentic is sold out everywhere. So will consider this clone if it is really good quality @Andre

 

[Andre]

Haha dont like buying clones but authentic is sold out everywhere. So will consider this clone if it is really good quality @Andre

Fair!

 

[JakesSA]

These are from Lemaga, who actually sell two or three versions. They don't manufacture clones, just buy up from the cnc lines and onsell. This is the case for most of the well known clone 'brands'.

The version I sell has a single stainless steel cap and stainless centre post, quality is ok, good fit on cap and ring but they do have the odd machining mark on the inside. Well finished on the outside.

For the BF modification I replace the flimsy copper screw with a large diameter stainless one.

Next batch is arriving tomorrow btw ..

 

[JakesSA]

The Derringers are now back in stock, if you need bottom feed modification please do make a note in the comments section on order checkout.

 

[Imthiaz Khan]

@JakesSA, will the stainless steel pin not cause a voltage drop?

 

[huffnpuff]

The Derringers are now back in stock, if you need bottom feed modification please do make a note in the comments section on order checkout.

Are there bottom feed modded units immediately available or, to manage expectations, could you please indicate the lead times for modded products?

 

[JakesSA]

@JakesSA, will the stainless steel pin not cause a voltage drop?

It will .. how much I cannot say. I do see the Derringer 1.2 from Praxis now also has a stainless centre post.

Are there bottom feed modded units immediately available or, to manage expectations, could you please indicate the lead times for modded products?

Generally speaking I do the modifications on weekends but I am busy with a batch of Derringers at the moment which should be ready to ship on Thursday.

 

[JakesSA]

Voltage drop calculation for the derringer stainless steel centre post vs brass centre post.

First we need to determine the resistance of the centre posts..
The formula:
R=(p*L)/A
where
R= resistance in ohms
p=Resistivity of material (ohm meters)
L=Length (meters)
A=Area of cross section

Dimensions for the Derringer:
L= 0.01475 (length of centre post is 14.75 mm or 0.01475 meters)

A=pi*radius^2
A=3.1415927*0.002^2 (centre post diameter is 4mm, radius is thus 2mm or 0.002 meters)
A=0.000012566

For stainless steel (304 grade) the resistivity or p=0.0000078
R=(p*L)/A
R=(0.0000078*0.01475)/0.000012566
R=0.009155658 ohms

For brass the resistivity or p=0.0000007
R=(p*L)/A
R=(0.0000007*0.01475)/0.000012566
R=0.000821662 ohms

So let's calculate voltage drop at say 20 amps (+- 70 watts).

For stainless steel centre post:
V=I*R
V=20*0.009155658
V=0.183113163

For brass centre post:
V=I*R
V=20*0.000821662
V=0.016433233

So the voltage drop on a stainless steel centre post is +- 0.17 volts more at 20 Amps than that of a brass centre pin.

Note that these calculations aren't 100% accurate since the centre post is hollowed out and the exact type of brass and stainless steel is not known but I think it illustrates the point.

Edit: I forgot to mention that, in vaping terms, a voltage drop of 0.17 volts at 20 amps translates to a 3.4 watt drop in output power.

 

[johan]

Now anyone tasting the vape difference between the stainless steel and brass center posts, must be exceptionally good.

 

[Imthiaz Khan]

Thank you for the info @JakesSA
Appreciated!

 

[John]

Many thanks @Alex! Appreciate the pics and feedback! As soon as you are 100% happy @VapeGrrl can ship me a BF one! I will keep my non-BF one for trying to get to grips with this dripping kak!

Or you can sell me your non-bf one

 

[JakesSA]

I have a few extra modified units in stock now, select bottom fed modified from the drop down list, here

 

[SamuraiTheVapor]

1 x BF Derringer pretty pleaaaase.

 

[Andre]

1 x BF Derringer pretty pleaaaase.

Ah, you got a bottom fed device? Tell us about it please.
Suggest you place your order on the web site, select the bf option. Link in the post jus above yours.