I purchased an inexpensive BLDC for some tests on a 6S battery pack. The RCTimer 4215-530Kv could be loaded up to about 20A at 24V (the limit of my bench supply) with an 11×4.7 SF propeller (in stock). The motor is a low pole count motor, 12N14P. On 24V, the no load speed should be almost 13,000rpm, and fully loaded perhaps three quarters of that.
Above is the motor as supplied. I used an ordinary M6 propeller nut so that it was easy to remove and replace without wearing out the nyloc nut supplied.
Above, the induced voltage waveform at 940rpm, somewhat the result of the 12N14P configuration.
The ESC was a Hobbyking 40A ESC 4A UBEC 9261000003, SimonK commit 02bd8e4ca36a06722efe51bc7cd5130d72a184b8 with COMP_PWM.
On a steady test on the 24V bench supply, the drive drew just on 20A cold and was clocked at 9200rpm with the Gemfan 1147 SF. Winding speed up and down slowly (to avoid degenerative braking which is incompatible with the power supply), motor starting, acceleration and deceleration were always smooth and without any sign of sync loss.
Tests were conducted with a script that I use consistently with asrg and eLogger to capture current, altitude is 700m.
The motor worked well under the test conditions with a WOT input of 480W.