Shanghai Dualsky Models Co., Ltd. XM6352EA-24SE V3 240KV

The XM6352EA-24SE V3 240KV belongs to the Dualsky EA V3 series and is an outrunner with a 63 mm diameter for heavy multicopters. Dualsky is a manufacturer from Shanghai. At 510 g of motor mass it is made for aircraft with large propellers and a high payload, as built in the heavy multicopter class.

240 KV means low speed with high torque: each cell at 3.7 V nominal gives roughly 890 rpm of no-load speed, and twelve cells give about 10,700. That makes the motor suited to large, slowly turning propellers and good efficiency in a hover rather than high peak speed. The maker quotes 3,330 W for 510 g of motor mass, which is roughly 6.5 W per gram.

Power figures only mean something with their time span; makers use 3 to 180 s, and a peak value is not a continuous load. In a hover a motor of this class uses only a fraction of its maximum power, the rest is reserve for gusts and climbing. At 240 KV the suitable cell count lies in the upper range of multicopter batteries; motor, speed controller (ESC) and battery must carry it together. The whole aircraft counts for the rules as well: up to 25 kg take-off mass a drone stays in the open category (classes C3 and C4), above that the specific category begins.

With a 63 mm bell, the mounting carries the main share of the vibration: loose screws on the arm and unbalanced propellers show up first as roughness in running and as humming in the gyro signal. The checks are bearings (roughness, play), shaft (true running), bell (no rubbing on the stator) and winding (discoloured varnish, equal resistances between the three phases). Anyone flying long hovers should check the motor for warmth after landing, since lasting heat ages the insulation.