Keda B2040-20L (2900Kv)

Prop	Volts	Amps	Watts	rpm	Thrust	Efficiency
-	7.0	0.8	5.6	-	-	-
3x0	7.0	1.23	8.6	20230	-	35%
GWS EP4025	7.0	4.8	33.5	18710	132g	75%
GWS EP4530	7.0	7.4	51.7	17570	188g	75%
APCE 4.5x4.1	7.0	9.4	65.5	16710	186g	74%
APCE 4.7x4.25	7.0	11.1	77.4	15970	185g	71%
APCE 5.25x4.75	7.0	14.4	101	14400	247g	66%
APCE 5.1x4.5W	7.0	15.6	109	13870	292g	64%

Kv 2970

Io 0.8

Rm 0.146

This inrunner has a 2.3mm shaft and weighs 68g, so it might be a suitable replacement for a 'Speed 400' brushed motor.It is rated for 12A maximum, but with good cooling over the fins it could probably take 15A continuously (on 6~7 cell Nixx or 2S Lipo). With 5~10% better efficiency than a brushed 400 it should give a modest performance boost, and much longer lifespan.

From the outside my motor looked very nice, but the shaft felt stiff. When tested the no-load current was much higher than expected, so I unscrewed the front end and removed the rotor to see what was wrong. Windings were a bit messy but well packed down, and the airgap was clean. The culprit proved to be a buckled thrust washer.

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