Vapefly Galaxies MTL RDA Review

Vapefly Galaxies MTL RDA

Introducing the tightest dripper for squonking!

Looking for a “tight” MTL dripper for squonking? Then the Vapefly Galaxies MTL RDA is the first 22mm-diameter single-coil RDA for you.

Of course, as an MTL RDA, it’s not for “chasing clouds”. But it can provide quiet puffs with smooth and dense vapour. Its special characteristic is adjusting your MTL puffs from airy to unprecedentedly tight, starting from your choice of bilateral or unilateral air-supply to the coil.

There aren’t that many pure MTL RDAs of 22mm diameter out there. But the Vapefly Galaxies MTL RDA could be the most versatile “tutor” for introducing new MTL vapers to the world of RDAs.

Vapefly Galaxies MTL RDAVapefly Galaxies MTL RDA Packaging Includes:

  • 2 pairs of Ni80 pre-wrapped coils (one pair with 26ga on a 2.5mm pivot-core and the other one with fused Clapton 28ga + 44ga * 2 * 16 on a 3mm pivot-core)
  • Cleaning pad
  • The BF pin (from the factory, the atomizer comes with the regular pin on)
  • Spare orings (one pair for the base and one pair for the drip tip)
  • 8 spare screws (4 of them are hex-headed)
  • Triple screwdriver and an Allen key
  • User-friendly (with pictures) manual

Vapefly Galaxies MTL RDA Review

Vapefly Galaxies MTL RDA Specifications

It is high-quality made (of stainless steel) and comes crystal-clear clean. The upper part of the top cap is covered with a non-removable PMMA/Derlin material. So that your lips do not get uncomfortably hot if they touch the top cap.

Vapefly Galaxies MTL RDACheck out the manufacturer’s relevant page for the tutorial video on the RDA’s operation and set-up, in order to be able to easily understand the rest of the review.

The Flavour and Throat Hit… “Subject”!

I am not particularly referring to flavour (taste & smell together) and throat hit, as the performance characteristics of an atomizer (although crucial). They are mostly of personal perception, also depending on the set-up used.

Several objective factors, controlled by design/construction characteristics, are simultaneously involved in ensuring these performance characteristics.

Factors 1 and 2!

A first one is the adequate/continuous liquid-steeping of the sufficient quantity and absorbency of the cotton used. This factor, in an RTA, means that you should operate it at the limit of liquid-“overfeeding” your wick. But with a squonking BF RDA this is not an issue. You can squeeze your squonk bottle whenever you wish.

The second factor is that the air-flow beam should uniformly hit the coil’s surface with enough air velocity (before “breaking” into a turbulent/vortex flow), covering as much as possible the coil’s entire lateral cylindrical surface. This can be ensured by a long, narrow cylindrical air-guiding channel of a diameter, almost equal to the length of the coil (with its exit/output as close as possible to the coil’s surface).

This condition can be fulfilled in conjunction with the appropriate close-positioning of the coil’s surface against the air-holes’ output inside the vaporization chamber. The air velocity/pressure is kept high at the air channels output and close to the coils surface, leading to richer evaporation of the liquid used.

Factors 3 – 6! 

A third factor may be the small vaporization chamber, which raises the heat inside the chamber at the lower wattage, while at the same time “concentrating” the produced vapour.

A fourth factor is the design of the internal top of the vaporization chamber (actually, the top cap of the RDA) as a dome. An internally dome-shaped top cap, provides a smooth-flowing concentration/compression of the produced vapour, as it is guided to the drip tip’s input. The width of the dome’s outlet to the drip tip is also critical.

A fifth factor is the drip tip itself. Important is the design of its internal air channel (height included).

A sixth factor is the type of wire used and its thickness. The more “complex” the wire construction is, the larger the surface area wetted by the e-liquid. This allows for denser vapour.

Factors 7 – 10!

The seventh factor is the coil’s pivot-core. Larger cores engage larger available wick’s surface area in evaporation.

The eighth, ninth, tenth…factors are the wattage used (for each specific coil), the temperature succeeded, the amount of wicking and it’s steeping, etc… for each specific liquid used!

From the above, it is understood that the subject of flavour (taste & smell) and throat hit is quite composite and -in its most part- personally attainable, perceived and judged.

Keeping the above in mind, read further down the review in order to recognize and decide for yourself what design factors the Vapefly Galaxies MTL RDA covers, as far as the flavour/throat hit it can provide to you personally.

Important Features of the Vapefly Galaxies MTL RDA

A 22mm-diameter single-coil MTL BF dripper may be the upper diameter-limit of a possibly “tight” MTL RDA. But the Vapefly Galaxies MTL RDA has also a limited vaporization space (as compared to other 22mm-diameter single-coil RDAs) due to the significant thicknesses of the “walls” of its base/deck, as well as due to the size of its posts that cover a substantial part of the available internal space of its base. Notice that the posts are only 6mm apart (approximately), to “bear” your coil in between them.

Vapefly Galaxies MTL RDA ReviewThe Galaxies has an internally dome-shaped top cap, which does not make it a so-short top cap (32.4mm height). But it provides a smooth vapour-flow to the drip tip’s entrance and at the same time avoids hot spit-backs to the mouth (in combination with the internally narrow drip tip).

Its design also makes provision of two opposite-positioned long “limit slots”/grooves at its internal top (to take in the two opposite higher parts of the base’s walls), for letting the top cap rotate (to select the number of top cap’s open air-holes) and -at the same time- for easily unscrewing the RDA from the mod.

Vapefly Galaxies MTL RDA Review

More Features

Its base-well is deep enough for a substantial quantity of liquid (2ml, says the manufacturer). As a dripper, it can give you more puffs with a single dripping, by just pulling out (quite easily) the 510 drip tip (and not the whole top cap).

The base’s walls, between the posts, have recesses to “rest” the coil’s pivot-core when you set the coil up. In that way, the coil is directly aligned to the appropriate height against the air-exhaust holes inside the base for higher vapour density in each puff (leading to increased flavour).

Vapefly Galaxies MTL RDA

Important Features Continued

Suitable for squonking, it is equipped with a spare BF squonking pin with a double-sided liquid outflow for a faster soaking of both tail-ends of the wick.

The 510 drip tip (ultem/derlin) is of small size and ergonomically designed for the closed lips of an MTL vaper. Internally it presents a narrowing on its upper end, which compresses the vapour and increases the sense of a tight puff. Although this vapour’s concentration can give a richer flavour to the inhaled vapour, it also makes it warmer.

Vapefly Galaxies MTL RDA Review

Drip Tip Central

You should also try another 510 drip tip of a larger internal diameter and smaller height, just to expand your vaping quest on flavour, by taking advantage of the wide range of “Galaxies” air-settings (as they will be explained below). Note that with such a low-height drip tip, you will not have any issues with your lips when touching the hot top cap, since the top cap’s upper external-cover is made from a thermally insulating material (PMMA). This is another positive factor of its design.

Vapefly Galaxies MTL RDA

To be or not to be … tight!

(unilateral or bilateral air-flow supply to the coil)

The very special feature of the Vapefly Galaxies MTL RDA is the wide range of air-intake adjustment (wider than any other MTL RDA). It has a unique, intelligently designed and built air-supply system on both sides of the coil, which presents a special, additional -and most critical- airflow adjustment stage (not appeared in any other RDA).

It is encased internally in the posts, by means of a screw (one in each post), which can narrow –even further- each cylindrical air-supply channel, very close to the coil. This air-adjustment stage can make the Vapefly Galaxies MTL RDA the tightest RDA, in combination with the pair of opposite-located three vertically-placed top-cap’s air holes (of different diameter: 0.8mm the lower one / 1.2mm the middle one / 1.5mm the higher one).

Vapefly Galaxies MTL RDA Review


“Drastically” adjusting this air-adjustment screw (in each post) controls the tightness of the puff or how smooth it can be, the density of the vapour and the quietness of the puff. If it is not quite enough, try first to wipe out (with a paper towel) any excess liquefied vapour at the top cap’s internal surface (usually resulting from over-squonking or from using the non-appropriate wattage for the liquid). Then, try to draw a couple of strong short puffs, without firing your coil.

Vapefly Galaxies MTL RDA ReviewBut, by fully-screwing only one of the two mentioned air-adjusting screws, you can have an RDA with a single-sided (unilateral) airflow to the coil, to make it even tighter. In this case, it is best to place the coil slightly higher between the posts, so that sufficient air (from the one “active” air-supply channel) can “travel” below the coil.

Continuing the tight theme

However, the “crucial” thing about this unique additional stage of air-supply adjustment (with the air-channel screw) is that, with its narrowing (caused on the air channel-end), the air velocity is much higher when hitting the coil’s surface. To find out about this effect, try screwing this air-channel screw as much as you wish and suck the vapour even with the three top-cap’s air holes open on both sides of the top cap.

Of course, you can only select the two smaller holes to be open or even only the smallest one open. This is permitted by the design of the Vapefly Galaxies MTL RDA since on the external surface of the base (right behind the top cap’s air holes) there is a uniquely designed “external” air-channel that allows such a selection.

This “external” air channel guides the incoming air from the top cap’s air holes to a single “internal” cylindrical air-channel, which always “drives” the air to centrally hit the coil’s lateral surface, no matter how many holes of the top cap are open. This is a functional particularity not commonly appeared in other RDAs.

Notice that each of the two opposite “internal” air-supply channels is angled upwards towards the centre of the base (so that the hole of each internal air-channel inside the base to be higher than that on its external surface of the base) to minimize the possibility of liquid leakage during squonking.

Even Tighter 

Even if this air-adjusting screw is fully unscrewed (with its head flash-mounted to the top of the post), whichever liquid happens to pass through this “internal” air-channel outwards, it is actually dripped to the bottom of the “external” air-channel, which is covered by the top cap.

No excess liquid comes out of the top cap’s air holes since the lower air hole is just 0.8mm-diameter and is placed higher from the bottom end of the “external” air channel. In addition, no excess liquid comes out under the top cap to the surface of the mod, due to the two neighbouring parallel orings of the base.

The rotation of the top cap (to the right or to the left for adjusting how many of its holes will be open) is very easy, as your fingers “catch” on to the carved – on its outer surface – elliptical scribbles, presented as “orbits” of “Galaxies”, giving to the manufacturer the chance to promote such a name for this RDA.

A “Humble” Start’s Tutorial

Initial learning curve: At the very beginning, definitely “grease” all the orings and press down the top cap to snap into its place over the base. Make sure, by rotating it, that it has “seated” all the way down to entirely cover the base. Then you will see that the correct positioning of the top cap is self-controlled by the grooves engraved on its internal upper part.

These grooves put the top cap in the proper position to match its air holes to the base’s “external “air channel, in order to be able to easily take advantage of the air adjustment range. Rotate the top cap all the way to the left to find out that these same internal grooves (“locked” to the base’s wall) easily unscrew the Galaxies RDA from the mod.

Beginners do not need “complex” wires to “sense” what this is all about (it’s an MTL RDA after all). They can begin with simple wires, such as the humble Kanthal 28ga-26ga (in 2.5-3mm pivot-cores respectively) for 0.8-1.2Ω coils, starting even from the low 11-12W (due to the small vaporization chamber), even with one air hole of the top cap open. Thin wires need a little attention when screwing the coil’s legs to the posts slots in order for the screws to “catch” them tightly.

Tutorial Continued 

Don’t extend the coil’s length to place the coil’s legs perpendicularly inside the posts slots. The coil’s legs need to diagonally set in to the slots, for the screws to easily “catch” the wire when screwing them. Keep the coil’s length short and its legs will fit diagonally inside the slots. After, securely screwing the legs, adjust (with the pivot-core) the coil’s alignment parallel to the posts.

For increased flavour, it is better for the coil to be shorter, so that the air from the central air hole of each post to cover the entire coil’s lateral surface.

Also build a coil with a 3-3.5mm total outer diameter. It will cover enough space for the small vaporization chambers between the posts, causing the air from the air-channels to reach the cylindrical surface of the coil with higher velocity, without the air-beam having enough “travel”-time to create a vortex before its impact on the coil’s surface.

Tutorial Complete

Fro your next coil, you can try a simple 28-30ga wire on a 2-2.5mm pivot-core. You can then compare the above two “extreme” cases in terms of “tuning” smoothness, vapour’s density and quietness of the puff.

“Down the road”, you can use whatever type of wire you want. But the manufacturer recommends a minimum resistance of 0.5Ω.


Due to the wide range of the air-supply adjustments of the Galaxies RDA, every MTL vaper can find the suitable air/vapour performance for each liquid. Flavour, smoothness and quietness are all there. Just find yourself the time to “play” with the Vapefly Galaxies MTL RDA.


I am not in the vaping business. I found vaping as the escape door from my 25 years of smoker’s imprisonment. It just took me four days of attempting to totally get out of it, thanks to the appropriate –for me- “equipment” (includes e-liquids). Now, vaping “equipment” has become another one of my fields of interest, for helping others to discover, on their own, their personally appropriate “equipment”.
I am a hands-on enthusiast… by genes. I am triggered by everything that evokes any data already stored in my knowledge base, been a Physicist and an Electronics Engineer (for more than 35 years). I am intrigued by everything new that my knowledge-filter considers interesting enough to be analyzed for entering into my memory compartment. That’s why you will find me open-minded and out-of-the-box thinking. I have an urge for unfolding hidden “pictures” of design thinking on everything man-made.