HOBBYWING XRotor 2306 Race Pro 1750KV

The HOBBYWING XRotor 2306 Race Pro 1750KV is a 5-inch FPV motor for racing and freestyle with 12 slots and 14 poles (12N14P). Hobbywing is a Chinese maker of drives and speed controllers. At 27.5 g without cable the motor is among the light drives of its class; rotor diameter 27.9 mm, case length 17.5 mm.

The stator is 23 mm in diameter and 6 mm in height. At 1,750 KV the motor turns roughly 38,900 rpm unloaded on 6S (22.2 V nominal). Over 30 s the maker quotes 26.11 A and 626.64 W; 626.64 W at 26.11 A corresponds to a voltage of 24 V. The thrust of 1,831 g was measured with the Azure 5150-3 propeller at 24 V, which is 67 times the motor mass. Permitted cell counts are 5 to 6S, and propellers of 5 to 6 inches are recommended.

Time basis and test condition belong with each of these values: 626.64 W is a 30 s value, and 1,831 g holds for exactly this propeller at 24 V. On 5S the same motor gives less speed, less current and less thrust, and a different propeller shifts the result further. Motor, speed controller (ESC) and battery must tolerate the same cell count. For flying, the rules for the whole drone apply: the EU class depends on take-off mass, and operator registration falls due from 250 g or with a camera.

Racing motors are trimmed for low rotor mass, and robustness in impacts suffers: the light bell distorts more readily when it hits the ground and then rubs on the stator. After every hard crash the bell should be turned by hand: it must run freely and quietly. The bearings are the second wear point and the phase resistances the third. Equal resistance across all three phases speaks for an undamaged winding.