This was sent to me for review from Wotofo (check it out here). This is a new mouth-to-lung RTA from Wotofo developed in partnership with Matt Cully from SuckMyMod. I love RTAs, I love mouth-to-lung vaping, and Matt knows his stuff, so this seems like a perfect collaboration.
Specs
- 3ml capacity (or 2ml in the UK)
- Size: 22mm diameter, 51mm tall
- Adjustable airflow
- Top-fill
In the Box
- COG RTA
- Two coils
- 0.8 ohm dual-core fused Clapton coil
- 1.2 ohm coil
- Bag of cotton
- Spare screws and o-rings
- Screwdriver
Design
It’s a nice looking tank. There’s some knurling at the base of the tank, small airflow holes, a curvy chimney behind the tank, and a small concave drip tip. It’s nothing crazy, but it has an overall nice look to it.
Drip Tip
This is a typical MTL tank drip tip. It’s a 510 resin tip, 11.8mm long, and it further restricts the airflow with that concave design and might just slightly reduce flavor loss.
Top Cap Assembly & Tank
The drip tip fits into the top cap and the top cap screws into a top fill ring.
With the top cap unscrewed, you’ll have some very large liquid fill ports to fill the tank.
One thing to note here is that the tank is actually PCTG plastic, not glass.
This plastic has the benefit of looking super clear, just like glass, but has the strength of plastic. Wotofo recommends not washing this tube in hot water, probably because it’ll deform, so that’s something to keep in mind.
Matt had mentioned that he wanted plastic to make it lightweight, and it’s definitely light.
The chimney and barrel are screwed together, so if you want to take them apart, unscrew this screw at the top of the barrel. I didn’t notice this at first and I pushed pretty hard and it sounded like it was about to crack, so don’t try to get these two pieces apart without unscrewing them first.
The Chimney
Let’s talk about that chimney piece.
So what I’m seeing here is that the area that covers the deck is about as small as they could possibly make it. Wotofo left only a little bit of space above the deck and even curved the cover inwards to reduce space even more. Once that coil fires, it sends the vapor through this super skinny chimney and it opens back up near the mouthpiece.
I don’t know how all of these things impact flavor, if at all, but I find it a very interesting design choice. I would have loved to have been there to try all the variations that led to this final version.
Deck
The build deck is about as easy to use as it could be. This is a two-post deck designed for single coil builds. The posts use spring-loaded clamps, so all you need to do is unscrew those clamps, fit the coil legs under each one, close it down, and then snip the ends. You’ll want to position the coil as close as you can to the airflow hole below it.
If you unscrew the posts too far, the screw comes out with the spring, so just be aware of that. The spring isn’t super tight so it shouldn’t fly out at you, just know that it’s in there so that you don’t accidentally lose it.
Wotofo included two pre-made coils in the package, which I would assume Wotofo and Matt have tested as working well in the COG RTA. So if you want to build these for yourself and just buy them from somewhere, here are the specs:
0.8 Ohm Dual Core Fused Clapton Coil
- Ni80 wire
- 30 gauge x 2 + 38 gauge
- 2.5mm inner diameter1.2 Ohm Single-Strand Coil
- Ni80 wire
- 28 gauge wire
- 2.5mm inner diameter
- 9-wrap contact build
Wicking
Wicking the COGRTA is pretty simple. What I do is fit the cotton in there somewhat tight, but not so much that it might have trouble wicking. You’ll need to tuck the ends of the wicks into the little wicking channels on the sides of the coil, so I cut the wicks just short enough to reach the bottom.
I leave it a little loose in the wicking channels and I haven’t any problems, but with RTAs, you have to be really careful because if you wick it too loose, it’ll leak. But for me, how I’ve wicked it seems to work really well.
Airflow
Ok, now here’s where the tank gets its name. If you flip the deck over, you’ll see cogs or gears. It’s closed off with a transparent cover so that nothing gets in there and it’s not designed to come off.
These gears move around as you adjust the airflow. Wotofo claims that this airflow system allows users to truly regulate their airflow and direct it straight to the coil, as opposed to other tanks that pull in airflow from the base interior, which I think implies that most tanks don’t direct airflow properly. I don’t know about that, but I think while these gears are functional, they aren’ really critical to the performance of the tank. What I mean is that this tank would have probably performed just as well with a traditional adjustable airflow. That’s just my opinion though.
The gears are really cool though. I think it’s a fun touch. And one of the really cool things about it is the tactile feel that you get while adjusting the airflow. Every time you move the airflow ring to a different hole, you feel a click. It’s nice being able to know that the airflow is in the right place without having to look at it.
Wotofo has a demonstration of this on their site too so that you can get a good idea of how it works.
There are five airflow holes to pick from:
- 1.6mm
- 1.4mm
- 1.2mm
- 1.0mm
- 0.8mm
Even though there are two airflow slots on the base, those both lead to a single airflow intake hole in the cogs, so you can only have one airflow hole open at a time. Since you can’t actually see what airflow size you have open, there are these indentations on the airflow ring that line up with this downward pointing arrow right below the tank tube. The arrow is pretty hard to see, which is a bit of a pain.
I’ve found that each hole has enough variability to make a difference, but the difference is pretty small. For me, the biggest airflow is too much for the way I like to vape MTL devices, so I like it on the smallest hole. I would have liked this to be just slightly more restricted with maybe one or two small airflow holes.
Final Thoughts
This is a nice mouth to lung tank that can give you big satisfying hits at low wattage. The flavor production is good too. It’s super easy to build, the airflow options all work well, and the gears are a fun touch. Some things I would like to be different would be for the tank to be glass and to have just slightly smaller airflow holes. But overall, I think it’s a pretty good MTL RTA worth picking up.
This was sent to me for review from Wotofo and you can pick one up for about $40.