Ongoing Battle with the Cobra RBA

[wizardelite]

Here's 2 pics of my current coil: 400 ss mesh, 28 awg kanthal,and 0.6 ohms on a mechanical.

View attachment 201634View attachment 201635

I know it's a pain setting up the Cobra at first, but once you get it running right, it's a great gen atty.

Awesome shots man! I'm really jealous. At least I know it's possible.

 

[wizardelite]

Thanks for the post. I'm interested in seeing how your U-Wick works out as well.

 

[donnah]

As others have said, your build looks fine. It's obvious your wick is not wicking fast enough to keep up. Also like said above, try upping your resistance for now... experiment with your wick.. is it tight in the hole? It should slide in and out pretty easily. Good luck! If I can do it consistently I know you can

Great video btw!

 

[Horselady154]

One last post and I rest it

if you havent had the sweetness of any juice blow you away
the flavors pop like they were poured into your mouth at its source
i already know you havent 1.8 coil @3.5 is perfect compromise 3.0-3.3 less vapor more flavor so you have to sacrifice
on a well sorted set-up the sweetness of even basic vg or pg juice is so overwhelming
you do not need flavoring

what is not understood is that top coils should never be stressed
if you make a proper coil it will last your great great grandkids lifetime
think of electric floorboard heaters they are the same identical setup we vape with and they last how long?
well the good ones lol

Kevin, I'm just going to say it. I am very interested in learning from everyone who has suggestions on how to make better wicks and coils, but your posts thus far are RUDE as all hell, confusing and not written such that anyone would understand what in the heck you were suggesting. If that was your goal, then you succeeded. If you were honestly trying to help people, then I'd suggest you try again and this time, leave out the demeaning comments and other insults. Thanks.

 

[vapdivrr]

Safety is not subjective youngster
this is not rocket science you have been misinformed
in my industry we cannot be off a micro-millimeter
this is hilarious

your dual setup is not .8 ohms
its measures on your device as that but its not
i wont tell ya what it is because it makes for humors
you have to do the maths to get to .8ohms
not use a series measuring unit

oh well people do crack and bomb other people thinking to themselves its subjective
its a simple electrical connection not even considered electronics
heat is heat

in the brown creation many micro-meters were very off, subjective? dont think so, humorous? maybe. and even the simplest connections will go bad as seen here or maybe there, or maybe up there^. all he doesnt know is hilarious.

 

[Blix]

He's just trolling, and obviously have no experience with RBA's to speak of. Use the report function.

 

[CountSmackula]

He's just trolling, and obviously have no experience with RBA's to speak of. Use the report function.

Already done. He's currently in the Sin Bin.

And you know, all his experience with the Fasttech "Cobra" (another freakin' Chid) should just wow us.

 

[Blix]

Already done. He's currently in the Sin Bin.

And you know, all his experience with the Fasttech "Cobra" (another freakin' Chid) should just wow us.

Ah there you go... And the "Cobra" in his signature is a Chobra...

 

[pdib]

so, forgive me cause I didn't read every post in the thread. SS mesh allows liquid to run through it very quickly. When you tilt it, the wick is quickly saturated with juice. SS mesh does not have much ability to retain juice. (its not a sponge). When you tilt it back upright . . . . plus gravity . . . . . . The short story is, in my experience, if you want to feed a .6Ω coil, you need a lot more mesh. When I was using 500 ss for .6Ω Genny setups, I was rolling 5-7" into a solid wick. (vs 30 mm). What I did read others saying is quite true, as well. Your wick can't be tight in your wick hole. At .6Ω, you need the outside surface of the wick for the juice to run down/along.

So, if you want to do .6Ω with ss on a Genny; drill out your wick hole to 5/32", roll a solid (no pin hole) wick from 7" of 500 mesh, and make sure your wraps are good and snug. I suspect the heat sink effect of all that ss will also help you out. (the coils will fire a bit slower, but that's what you'll need)

Last thing; just like we use 30g and 28g for sub 1Ω coils; we need to use 26g for anything under .8Ω. The proportions that apply to wire gauge and SLR don't stop at 28g.

This sounds a little drier/colder than I intended, so

 

[CountSmackula]

Ah there you go... And the "Cobra" in his signature is a Chobra...

Not even a Chobra... it's a Chid.

 

[aPandaz]

Cool, the troll is gone. Wizardelite, were you able to fix your problem?

 

[wizardelite]

Cool, the troll is gone. Wizardelite, were you able to fix your problem?

Yeah, I just ignored the troll.

Unfortunately I wasn't able to get it to work. I tried again tonight, taking into consideration all of the advice that was given here, and I still can't get my Cobra to wick properly.

After doing some reading online, I'm pretty sure it's how I roll my wick. The ends on either side of my wick are not consistent. On one end, the hole looks solid. Yet, on the opposite end of the wick, the hole is much wider. My theory now is the channel all the way down the wick isn't consistent.

I'm not giving up though.

 

[wizardelite]

Cool, the troll is gone. Wizardelite, were you able to fix your problem?

Considering that I can't delete duplicate posts, I figured I would just ask another question.

Do you have the Cobra? If so, what width do you cut your SS Mesh at?

 

[vapdivrr]

in the brown creation many micro-meters were very off, subjective? dont think so, humorous? maybe. and even the simplest connections will go bad as seen here or maybe there, or maybe up there^. all he doesnt know is hilarious.

was it something i said?

 

[aPandaz]

Considering that I can't delete duplicate posts, I figured I would just ask another question.

Do you have the Cobra? If so, what width do you cut your SS Mesh at?

Honestly, I just eyeball it.

 

[donnah]

Considering that I can't delete duplicate posts, I figured I would just ask another question.

Do you have the Cobra? If so, what width do you cut your SS Mesh at?

Go to toddsreviews.com there is a tab called mesh sizes for different devices

 

[wizardelite]

I shot a 4 minute video detailing my latest build...



Here are the changes I made.
325 mesh
45mm (length) x 30mm (width). Tight straw wick.
28 gauge kanthal
4/5 wraps
.8 ohms
Vaping 50/50 RY4 from Mount Baker Vapor.

I stayed with the Drill Bit Method. Yesterday I made and attempt at wrapping a coil directly on the wick itself and it was a disaster. I was battling hot spots left and right. Using the Drill Bit Method, I never have any issues with hot spots what so ever.

Switching from 500 mesh to 325 mesh did the trick. 500 mesh can't deal with 50/50 or 100% VG juice well at all. Or, I just haven't found the right width to cut my mesh. Or, it could be related to how I roll the mesh as well.

All I know is that 325 mesh is wicking like a champ. Vapor, throat hit, and especially flavor is intense. The only downside to this build is the draw. I didn't realize how thick 325 mesh actually is and a width of 30mm creates a really thick wick. This in turn makes for a really tight draw. Other than that as long as I do the Genesis tilt, I haven't had any issues with wicking.

I'm going to enjoy this current build but for my next build I'm going to cut the width down to either 25 or 20 mm.

In the end I feel like a huge weight has been lifted off of my shoulders now that I have finally got my Cobra atomizer to work.

Thanks for the tips!

 

[CountSmackula]

Congrats!

I guess that means your Cobra won't be coming to stay with me.

 

[Rule62]

I shot a 4 minute video detailing my latest build...



Here are the changes I made.
325 mesh
45mm (length) x 30mm (width). Tight straw wick.
28 gauge kanthal
4/5 wraps
.8 ohms
Vaping 50/50 RY4 from Mount Baker Vapor.

I stayed with the Drill Bit Method. Yesterday I made and attempt at wrapping a coil directly on the wick itself and it was a disaster. I was battling hot spots left and right. Using the Drill Bit Method, I never have any issues with hot spots what so ever.

Switching from 500 mesh to 325 mesh did the trick. 500 mesh can't deal with 50/50 or 100% VG juice well at all. Or, I just haven't found the right width to cut my mesh. Or, it could be related to how I roll the mesh as well.

All I know is that 325 mesh is wicking like a champ. Vapor, throat hit, and especially flavor is intense. The only downside to this build is the draw. I didn't realize how thick 325 mesh actually is and a width of 30mm creates a really thick wick. This in turn makes for a really tight draw. Other than that as long as I do the Genesis tilt, I haven't had any issues with wicking.

I'm going to enjoy this current build but for my next build I'm going to cut the width down to either 25 or 20 mm.

In the end I feel like a huge weight has been lifted off of my shoulders now that I have finally got my Cobra atomizer to work.

Thanks for the tips!

I took a quick look. I didn't watch the whole video, but watched the dry burn. Your build looks good. As for the draw, bear in mind that the Cobra is noted for having a fairly stiff draw, because the stock air hole is smaller than some other RBAs. It can be drilled out, but it's titanium, so it's a little tougher than drilling stainless. I don't drill mine out, but I make sure to leave the fill screw out, and make sure the wick has a small hole in the center.

 

[carcen5]

As suggested by Thrasher elsewhere, I have found the best flavor, vapor and wicking on the cobra is with a wick consisting of 325 mesh rolled tightly, then 500 mesh rolled on top of that. So you end up with a "dual wick"(not talking about two seperate wicks). The 325 will help wicking by naturally vaping, and the 500 will help with capillary. This has worked wonders for me and I'm using 70vg liquid.
As for measurements, I usually start off with about 30mm of each, but in the end can't roll wick tight enough and might have to trim 5-10mm of the outer 500 mesh. Next time I'll start with 25mm of each size.