A custom team pilot motor produced by T-Motor for Blackbird FPV.
Results here are interesting. This motor was designed specifically to work with light to mid torque-loaded 5" props and deliver a specific combination of smoothness and power. The targeted prop for this design was the T-motor 5143. The weaker magnets used here are designed to smooth out the response curve and move more quickly through the light torque loading at low RPMs without over-emphasizing the top end. The results here show it's definitely hitting those targets. The raise in Kv and slightly weaker magnets result in a bit higher than average current draw under static load, but that should largely equalize when unloaded in flight, as the efficiency loss seems to be primarily in the last 1/4 of the throttle. The slightly lower torque capacity of the scaled-back magnets is evident in the re-ordering of the props between the 75% and the 100% throttle points, where the higher torque-loaded props drop slightly behind the lighter props like the 5x4.3x3 v1s and the original HQ 5x4x3. Overall, I would say this motor exactly accomplishes what it was intended, and it's nice to see a design built on data achieve its design goals. This motor won't be for everyone, but for pilots looking for snappy response on 4S and lighter weight tri-blades, and a throttle curve that emphasizes sharp moves without exaggerating the top end, this is an excellent option.