Hitec HM300 Brushless Motor | 140x25mm 3800W | OE HIT-M14025

One lift motor. 140 mm bell, 25 mm deep, 3800 W. It goes on the arm, under the rotor. Bracket, propeller and screws are not in the box.

Hitec in one line. The company started with servos and actuators, then added airframes: the Xeno FX fixed wing, the SUI Endurance LT quadcopter, and the Quantum Trinity VTOL. None of those is a sprayer.

What that means for this part. There is no HM300 airframe in Hitec's public catalogue, and no lift motor part number either. The number on this page, HIT-M14025, is ours. Nothing was borrowed from Hitec to fill the field.

Sizing. 3800 W on a 140 mm bell is a heavy lift class motor, the sort that carries a 20 to 25 kg airframe. If your frame is lighter than that, this motor is more than you need and the extra weight costs flight time.

One motor down on a quad ends the flight. Not a shorter flight, not a gentle descent. There is no five rotor mode and no parachute in the box.

Before every flight. Hand spin all four. Rough or clicking is a bearing. A can still hot after landing while the others are cool is pulling current it should not, and it is grounded until you know why.

Fitting. Battery out, four screws into the arm. Start them by hand, two passes. The magnets pull the bell down hard once it is close, and the windings are what gets nipped.

Dust and wash water. Wipe the bell, blow out the vents, keep the plug dry. Water in the connector shows up as a stutter at low throttle, and it is usually the plug, not the winding.

Diagnosis, in order. Hand spin: rough or clicking is a bearing. Nose: burnt varnish is a winding. Meter: unequal resistance across the three leads is a shorted turn. One hot can among three cool ones is a motor working harder than its share.

In the box, one motor. Six months against dead on arrival and winding faults. One piece ships, twenty starts a production run, fifteen to thirty days. Tell us the rotation when you order.