A larger stator high Kv edition of the Returner R3 line sent over by Brother Hobby for testing.
This test is quite interesting becuase this motor is essentially identical to an earlier motor, the Multicopter Builders MB2207 2500kv, except for the open bottom design and 7075 upgrades. The prop list has changed a bit since then, but the comparison is interesting to see. The open bottom design seems to allow for better cooling of the stators, and there is a noticable reduction in heat losses during the sustained segments of the test. That is probably quite emphasized by static load testing, but is a positive sign. As a result the numbers are slightly higher on the sustained thrust tests for the new R3. Other than some small differences, due to the heat disipation, the results are extremely consistent, which is a good indicator of the consistency of the test equipment even with a fairly decent time difference between tests. Solid results here, even on the heaviest props it barely tapped 40A, staying in the upper 30s and well over 1500g on the heavier 5" props, and around 1450g in the mid 30A range for the mid weight props. Even late in production as the R3 line is at this point, this motor is still a very good balance of power and current consumption, especially when taking the low weight into account.