A wide stator motor made for ZDrone by BrotherHobby.
The results here are extremely interesting given the stator size and design of this motor. It very much backs up my previous experience with wide vs tall stators. This motor has plenty of low end response, the RPMS jump up pretty quickly in the low throttle and the number down low are on par or a little ahead of the 2206 motors of similar Kv and design from Brother Hobby, but as the throttle increases the torque drops off. One thing of particular resistance is that the coils in the 2405 seem to be a good bit higher resistance than in the 2206, creating a larger voltage drop as current increases, which seems to be contributing to the torque losses as the RPMs increase. The rate of change of RPMs, especially on the heavier props, was also slightly slower than it's 2206 equivalent. This is particularly interesting as the overall stator volume of the 2405 is about 4% larger than the 2206. This backs up the theory that wider stator motors give better low throttle handling at the expense of top end speed, though more testing definitely needs to be done. Don't let this discussion of the minutiae distract you though, this motor still does extremely well, and I was struck by how smooth the acceleration was on the stand. The throttle curve is likely to be ideal for some pilots looking for the specific type of control this motor offers, the smoothness of the acceleration will appeal to certain flying styles, and the thrust numbers are still on par with other motors in their weight class, all in a very attractive and well produced package.