KV is the most misunderstood motor specification in FPV. It is not a measure of motor quality or power — it is a ratio that determines how much RPM you get per volt. Definition KV = RPM per Volt (unloaded) A motor rated 2400 KV spinning at 16.8 V (4S fully charged) will spin at: 1RPM = KV × Voltage 2RPM = 2400 × 16.8 ≈ …