This test is the second in my high KV series after my initial tests on the RotorGeeks 2205 2700kv motor several months ago. I've got a line-up coming to the site of some very interesting motors over the next bit.
EpicRC was kind enough to send over this motor for testing along with it's big brother (the 2204 3200kv). These are OEM T-Motor 2204 motors, so the quality and build is excellent, and the design is quite recognizable with those of you who are familiar with the early MN series motors. These motors have the 3mm shaft of the later revisions of that motor and the bearings are very smooth with absolutley no play in the shaft, and no notching. Because these are true 2204 motors they are very light, so this combined with their high KV is a big point in their favor for smaller builds.
These motors did very well on the small props. I started out with 3" props, and didn't expect much. The thrust there really isn't even worth it on these motors, but it will be interesting as a point of comparison against other motors in the high KV test series. I tried to choose a range of props that would be flexible for the KV ranges I'll be testing, and the 3200kv twin of this motor will push those 3" props a good deal harder, though with a 22mm diameter, it doesn't leave much room for the prop. Results reflected that with numbers in the mid 300's to low 400s for most of them.
Numbers started climbing rapidly with the 3.5" and 4" props, and the motor really comes into its own on the mid range 4" props, like the 4x4x3. The DAL 4x4.5x3 was really too much prop for this motor. The windings temperature shot way up and there was a strong smell of resin. It didn't damage the motor, but even unloaded in the air, this prop won't be ideal for these motors due to the slower acceleration of the prop and high current draw.
The surprise here was the Diatone Ghost. Yet again this prop shows amazing efficiency, hitting almost 1kg of thrust at only just over 20A. The numbers were very close to the RotorGeeks 2205 2700kv, which is amazing given the smaller size of this motor. RPMs were only lower by a small margin as well as thrust. Given the time and weather difference between the tests, the results aren't 100% comparable, but still very impressive that it got close enough for that to matter. Again, these props are quite flexible, so I'm nots ure how that will translate into flight charactersitics, but in terms of acceleration, loading, and current draw, these props did very well on this motor.