Thanks to GearBest for sending us these motors for review. You can purchase the motors here.
To this day the Emax RS2205 is still a hugely popular motor, as it was one of the first to use the more powerful N52 magnets. Will the RS1306 be just as good as its older brother?
The Motors were packaged different from other Emax motors we received in the past, in a electrostatic bag instead of the usual motor box. However included in the bag were the necessary screws as well as 3 nyloc nuts. More on them later. The Motors were smooth when we spun them up by hand, and the windings seemed to be good quality.
- Framework: 9N12P
- KV: 3300/4000
- Length: 28mm
- Diameter: 18mm
- of cells: 3-4S lipo
- thrust: With GF3040 BN 3 Blade Prop Max.thrust:340g
- Shaft: 2mm
- Propeller: 5″
- Weight: 12.7g
- RS exclusive “Cooling” design on a micro sized motor
- Designed for 3” propellers up to 4s battery
- Integrated 5mm prop shaft with lock nuts
- High Quality NSK Bearings for long lasting smoothness
- Strong N52 Magnets
- Factory Balanced Precision CNC Motor Bells
We were somewhat impressed by the motors. They were certainly more powerful than the 1306 3200kV RCX Motors we had been using. But they were not as powerful as we had hoped. Throttle punchouts were weak and anaemic. And manoeuvring in prop wash turns was not as quick as we had hoped. On our larger quads, you feel you have the power to rapidly turn no matter what speed you are going. Whereas on this atom (using the Emax RS1306) you were really limited by the thrust you had at hand. There were numerous occasions where we crashed due to the fact we did not have the extra thrust to pull out of a hard manoeuvre. It must be said though that we were using the higher kV variant, perhaps the 3300kV version would have had more torque. However once you got up to high speed, the quad really did rocket along, and it made for a pleasant experience trying to shoot gaps at high speed.
One issue we found was motor temperature. We tried both the Dal 3045 and the RotorX 3040t. The DALs were borderline unusable as the motors simply got too hot during even a test hover, (yes we did check our PIDs at least 3 times and they were all in an acceptable range). The RotorX props did run at a lower temperature, although we are not sure whether the motors would survive being run on 4s. When we did run the DALs, we noticed they flew substantially worse compared to the RotorX props, there is simply too much prop to spin for a 1306 stator and you could really tell during cornering.
Finally, there was an issue tightening the props using the supplied lock nuts. The nyloc nuts were so tight that we were unable to grip the stator to correctly to tighten the lock nut. As a result we had to switch over to regular nuts. These have yet to come loose during regular flight. But its an extra thing you need to buy if you want to tighten your props!
These motors are a step up from the cheaper and older 1306 motors. However the N52 hype simply does not translate to this smaller form factor. The torque was lacking, especially on the heavier DAL props. They make for a pleasant high speed micro quad, but not one bound for the race course.