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T-Motor "Blackbird" 2207 2725kv
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A custom team pilot motor produced by T-Motor for Blackbird FPV.

Check out the full list of motors in this series here

Summary

Published: Feb 20, 2019 by quadmcfly

T-Motor

Tested KV:2700kv
Weight:31.3g
Stator W:22mm
Stator H:7mm
This motor in particular is very interesting because it gives a very good look at how changing just a few variables in the design of a motor impacts the performance in directly measurable ways.  This motor is based on the Pro II design from the T-Motor F series, but a few key components have changed. The windings have been swapped for thicker single-strand winds, the magnets have been swapped for a bit weaker magnets, and the Kv has been adjusted to a bit higher Kv.  The end result is a motor that is designed to create a specific effect, giving a specific torque and response profile on a specific class of props that results in a very particular throttle curve and type of handling.  The specifications here were built largely on examinations of past data, and the predicted impact of design changes, so it's very interesting to see those predictions bear fruit.  The two-tone gold and black anodizing on the bell is a nice visual touch as well. Other than that, the design is inherited from it's heritage in the F line.

Results

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.