Been looking at it a couple of weeks now can't make up my mind, the reviews I found is in german or spanish, would like to hear some thoughts in english and where it can be bought besides https://www.vapor-freak.de/zubehoer/Selbstwickelverdampfer/DRA-XL
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Looks similar to an IGO-L, with an adjustable positive post offset from the center.
The threaded cap might make aligning the airhole difficult, unless it's designed to be in the right position when tight.
The threaded cap might make aligning the airhole difficult, unless it's designed to be in the right position when tight.
It is heavier steel than igo-l and over all better build quality, worth the extra dollars IMO. Toddecigreciew has a new review in English, good review. Only from vapor freak at the moment I think but will post back if I find otherwise. Air hole lines up perfect. Swivel arm nut usually needs to be tightened a little and the one ml air hole can use a little widening but I don't like firm draws. All this stuff is simple to deal with. Great size, deep well, holds about twenty big drops.
Also, what people don't get about it is as you adjust the movable arm inward the resistance goes down, without having to loosen or adjust the wire. Yeah, that's right changing the position of the position of the post without disconnecting your coil will change the ohms, very cool. It is a principle of electricity that I don't quite understand.
Todd didn't seem to agree. The concept as I understand it is that you can move the posts closer together to allow you to use less wraps of coil, not that it does it "on the fly". A given length of Kanthal of a certain gauge has a given resistance. Pushing two posts together isn't going to change the length of the coil wire unless you at the same time unwrap some coil, pull it through the hole in the post and re-tighten.
I and willing to be wrong but you can change resistance of wire without changing the length or gauge just by coiling and curving the wire because an electromagnetic field travels along the wire. It is how some signal filter, transformers and other electrical devices work. Please watch the last half of the rda xl video on vaper freak it doesn't matter that it isn't in English. Todd being in IT should know that if you untwist the wires inside of an Ethernet cable then it won't function properly because the data will jump from one wire to another even though they are insulated from each other. You can stand under high tension wires with an induction coil and take power from the lines even through the roof of your house because of electromagnetic energy. I'm not being my life that this is what happens it just looks that way in the video. No matter, I will have mine once it ships from Germany. The semiclassical magnetoresistance due to Lorentz force is computed for current flowing in a curved wire in the form of a two dimensional annulus. The surface scattering is taken to be diffuse, and the bulk scattering is s wave and elastic. Near zero magnetic field the resistance has a minimum instead of maximum in a straight wire. The resistance continues to decrease until it reaches a local minimum field based on a cyclotron radius between the inner and outer radius of the annulus. In a curved wire the optimum magnetic field for reducing surface scattering is not zero field as for a straight wire, but a field which allows electrons to go part way around the curves. Which explains the negative magnetoresistance near zero field seen in curved wire segments.
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That is frigging fascinating. Seriously, I watched the video and for as long as I've been wrapping coils I never had any idea a change as large as 0.4ohm could be achieved simply by leaving an existing coil and wick in place and moving the atomizer poles closer together or further apart. I'm not sure your explanation is the right one (I don't doubt it either), but the fact that the coils do not appear to even move closer together when he moves the poles doesn't seem to indicate a proximity effect. Are you saying that curving the coil assembly causes the drop in resistance?
Very interesting stuff. I don't mind being wrong in my previous post; one can always learn more. I had always been taught, and taught others, that a given length of kanthal of a given gauge has a given resistance, regardless of how it's wrapped. I see now that that may need to be re-thought.
Watched the video. Looks very much to me like when the post rotates in, it comes in contact with the next coil in. That seems a bit more plausible. He is, in effect, shortening the wire.
Either way, that's a nice RDA
Either way, that's a nice RDA
Well the technical explanation is not my own, it is lorentz law, I forgot to put quote marks, and true that it is not talking about our dimensions nor the twisting field of acc wrapped coil, but I know from school that the principle and concepts are sound. Think of the simplest form of a capacitor that you can make with aluminum foil and a milk jug. In that case you can store a ton of electricity in nothing but the air between two pieces of foil. Crosstalk in traditional style phone lines can happen when they are next to each other and not twisted. The twisting keeps them on a different axis from each other. If you run the wires parallel to each other, their electromagnetic fields cause your voice to jump to the other line even though they are insulated. That mean that current is being transferred. So when the positive and negative are close some of the power will hop around the shorter way. It is pretty cool. Sorry to repeat the example but it is interesting to me. This dripping atty let's us use those awesome mechanical mods and adjust the resistance as the battery fades. My fear is that nobody will realize this and the atty won't get its due credit. Before its time so to speak. I have a awesome signal filter that uses a flat plastic housing and glass wires to bounce the signal around and filter it, which is amazing considering none of the materials conduct electricity. Old technology now. Let me know if you fond out more I will do a blog post on it once I have all the facts and the arty, any info helps. I may ask Tom Jones YouTube name EEVBlog. Super smart electrical engineer guy.
Yeah,that was my first thought, but I feel like that would be sort of inconsistent, like sometimes shorted, sometimes not. We don't really need the atty to try it,I don't think. I may build a coil hook it up to a battery then curve it and see. I think you need the power in the equation, I don't know if you would see a change with a multimeter cuz that is such a little amount of power and little field
Multimeter might not tell you. But you could tell by the vape intensity. You should just slip a whetted wick in it and bend it. I bet you could tell just by the sound of it's hiss.
Anyone who thinks this is interesting, make sure you are subscribed to the thread cuz after the long wait for shipping from Germany to Georgia I will do a video and i'll make sure that the close ups are in focus. We can find out just how wrong I might be, haha.
For anyone who is curious about the shipping to America. The cheapest option as shown below is more than the atty, haha. But it is quality for cheap, if it was made here it would probably be like forty bucks. Oh and the numbers don't quite add up cuz I got another ego adapter for evods.
1x DRA XL (DRA XL) 15,97
Order Totals Sub-Total: 17.65 USA (Price: 17.65): 19.90 Total: 37.55
1x DRA XL (DRA XL) 15,97
Order Totals Sub-Total: 17.65 USA (Price: 17.65): 19.90 Total: 37.55
I just translated the vapor-freak.de page again, and the description of the DRA XL doesn't say anything about it. Then, I was looking up some of the math, and I am starting to think that the curve, size of wire, etc, is not big enough to make a noticeable difference. I'm starting to feel more an more wrong, but the video is still curious.
Only me 
By my own admission, I an not an electrical guy at all but I can tell you that this is a good rda.
Personally after playing for the past few days, yes I can change the resistance but IMO given the scale of change I don't see the benefit but once again that is just my opinion.
Cheers
Todd
Sent from my Shed.
By my own admission, I an not an electrical guy at all but I can tell you that this is a good rda.
Personally after playing for the past few days, yes I can change the resistance but IMO given the scale of change I don't see the benefit but once again that is just my opinion.
Cheers
Todd
Sent from my Shed.
Only me
By my own admission, I an not an electrical guy at all but I can tell you that this is a good rda.
Personally after playing for the past few days, yes I can change the resistance but IMO given the scale of change I don't see the benefit but once again that is just my opinion.
Cheers
Todd
Sent from my Shed.
Hey, giant fan here. I use mainly variable voltage, but I agree completely with your appreciation for hand built devices that last a lifetime, but I haven't spent the money because I'm so used to having full power right up until the cell needs a charge. I thought that going from 1.7 to 1.3 ohms for example, would make up for voltage drop a little. The reason I commented on this thread at all was because I though it may be useful to you and other mechanical vapers, but only a mechanical vaper can answer that. Apparently it is not as useful as I thought, haha. If it was useful, I didn't want people to not know about it. It won't come in handy for me though. The best way I found a mechanical style experience with the simple interface is with my Buzz Pro and its simple adjuster knob, and being hand built in the US. I am in IT as well but want my vape experience organic. I deal with enough menus and tech at work. Thanks for all the great vids. Truly, they are an important part of my sanity.
I'd definitely be inclined to agree with you but I've built coils with the wraps touching and the electrons don't jump the wire, they simply light up as usual with no unexpected lowering of resistance (for example if I know a 5 wrap of 30 will give me 1.3ohm and I do a 5 wrap with the coils touching, it's still 1.3ohms).
Xtian seems to be saying that proximity of the positive and negative posts causes the effect, but wouldn't that make things like the Drunker tank (which only isolates positive and negative poles with a thin insulator bushing) have extremely low resistance?
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