In this review we are testing the latest EMAX RS2306 2400KV motors (white edition). They come in two variants: 2400kv and 2750kv and we have the former for the test.
RS2306 motors are available at: http://bit.ly/2nwHQtr. To learn more about mini quad motors make sure to check out the guide.
Unboxing
Motors are packed in the plastic box filled with foam inserts for protection. Items in each box:
- 1 x RS2306 2400kv motor
- 5 x motor mounting screws for 3mm arms (M3 x 6mm)
- 5 x motor mounting screws for 4mm arms (M3 x 7mm)
- 1 x M5 Aluminium prop locknut
The motor weights 35g, and has bigger 23mm wide stator than the normal 22mm. It has the same famous “red bottom” as previous RS series motors, but comes with a white bell. The white motor bell is a special edition thing, in the future batches it will go back to the normal black color. Prop shaft diameter is 5mm and it is designed for 3S and 4S LiPo batteries.
The larger stator size should in theory give this motor higher the torque and faster response and transition time. But the added weight to the motor might have some negative impact on response due to inertia. Guess we will find out in the testing :)
From thrust data provided by Emax, it shows this motor can draw some crazy high current with heavy 5″ props (as high as 50A on the 2750KV version). I think providing 200A is pretty impractical for today’s LiPo batteries even with burst discharge rate. Therefore this motor should really be paired with lighter 5″ like 5040×3 for example, and use on a lighter weight quad. High RPM, efficient and low in amp draw.
EMAX RS2306 uses shaft screw instead of C-clip, which is a most welcome feature based on the stories with failing c-clips.
RS2306 build quality is excellent, motor feels solid and it was smooth spun by hand.
Performance in the air
I tested RS2306 motors on the following quad:
- QAV-X frame
- FPVModel Quadrant 25A ESC
- Betaflight F3 Flight Controller
- HS1177 Camera
- ImmersionRC Tramp Video Transmitter
- FrSky XM+
- Turnigy Graphene 4S 1500mah
Please refer to static thrust data for the RS2306 motor. This motor seems to have adequate torque of spinning heavy propellers, however be aware of the current draw and efficiency when choosing props. It’s possible to draw 46.4A current running Gemfan 5050×3 props according to the chart.
Flying with HQ 5x4x3 1VS
I instantly noticed how smooth the quad performed. I simply replaced the motors on this build, and I didn’t change PID from previous motors, but it was still flying butter smooth and didn’t notice any jittering. Despite the fact that 5x4x3 props aren’t the most powerful props, I still got a lot of punch with the RS2306. Really nice cornering and responsive feeling in general. I was monitoring amps via OSD and it was never more than 30-35A per motor during punch out.
Flying with DAL Cyclone 5045
EMAX RS2306 motors really shined with the Cyclone T5045 triblade. The quad flew super responsively and locked in. So much punch yet it was really smooth. Maximum amperage was around 42A. Battery was a little warm after the flight, and flight time was around 2.5 mins with a mixture of punch outs and fast cruising.
I am still testing these motors, I will add videos here soon.
Verdict
The RS2306 is a bit on the heavy side but it is perfectly compensated by the increase in torque and power. It is very snappy, punchy but also very smooth, ideal for racing as well as freestyle flying. Also it was the fastest motor I’ve flown up to date that hasn’t destroyed my batteries!
12 comments
I actually have a set on a qav250.
What i like – plenty of power. It tosses the 250 around like a sun dried twig. Zero to too fast in the blink of an eye. And it will hold the power at the top until your battery runs dry. I have used them with 5040, 5045 and 5050 props, nothing slows it down, just drains the battery faster.
What i don’t like – NO SELF TIGHTENING SHAFTS on the motors. Constantly had to re tighten lose props on the CW motors until i added lock tite. They still come lose if i hit something, like a branch or the ground but not as often and the lock tite makes it more difficult to fix, but at least i can go through a couple of batteries before it hits the bench again.
Twitchy. They run like a 2 cycle engine. Poor performance at the low end until you hit mid throttle then they take off like a rocket. They fly great mid throttle and upward. Quad was constantly bouncing off the ground with low throttle maneuvers. The 2305 series on the other hand is rock solid low -mid and high throttle.
flight time. i get a solid minute or better with the 2305 series than the 2306. 4 to 5 with the 2306 and a solid 6 or better with the 2305 even though they are on a frame that is a good 100 grams heavier than the 2306. The 2306 are on a quav250, the 2305 are on a well abused Eachine 250 racer.
If you race, they are the motors for you. If you just like to fly however, the 2305 series has plenty of power and are a lot more stable with low throttle maneuvers. Honestly, for new or even average pilots, i would highly recommend the 2305 series or set expo at .10 to .20. Even then, they are like trying to drive a dodge demon in traffic. A lesson in pain. Too much power and ZERO forgiveness for the slightest twitch on the sticks.
i would not buy them again unless my pilot skills significantly improve and i start some serious racing. Will replace the motor on my qav250 with 2305 when i get angry enough at having to tighten the props.
Hey Guys, I’m interested in running Kiss 24A race with these motors.
Just got 1 question, are the esc’s too small for the amp draw ?
I would say so especially with the 30A current cap..
But it also depends on what props you run with them..
Whats better for freestyle on a quite heavy frame (armattan chameleon) these or the rs2205s 2300kv?
I personally will use these motors for a heavy build :) you need more power!! :)
plus ill never strap a go pro on mine..so thats like alot of weight im not going too have..?? so less amps yet?? right?
I personally would avoid running heavy props with them.. with light props they work better, more efficiently and draw less current.
any 30A ESC should be fine IMO.
just got these motors…..seriously….42a…but a 4s?? right…i think i should be fine on 3s and emax 30a bullet esc?? what escs where you running..
hi, what for a esc do you prefer ?
See this post :) Best ESC
Can these be mounted with normal arms designed for 2204 and 2205?
Yes, the screw pattern is identical to 2204 motors.