Neumotors 6514M Multirotor (Baureihe)

The Neumotors 6514M belongs to the 65xx family from the US maker Neumotors and is an outrunner for heavy multicopters. The type code gives a stator of 65 mm diameter and 14 mm height; the motor measures 75 mm across and 37 mm in height on the outside.

It weighs 375 g. Maximum power is 3.8 kW and continuous power is 1.9 kW. The peak is a short-term value and means something only together with its time base, which runs from 10 to 180 s across makers. The winding variants cover KV 19 to 474, from very large propellers on a high cell count to much smaller propellers. A taller stator at the same diameter gives more magnet area and so more power, at the cost of weight.

Aircraft with motors of this class often lift heavy payloads and can exceed the 25 kg take-off mass of the EU open category; an operational authorisation in the specific category is then needed. Below that, classes C3 and C4 apply, and Remote ID is mandatory for C1 to C3. The matching batteries usually hold far more than 160 Wh: for air transport, up to 100 Wh is free, 100 to 160 Wh needs the airline's approval, and above that they may not travel as passenger baggage.

In selection one works back from take-off weight and thrust reserve: in a hover the load sits far below the peak, and temperature in continuous running decides. Check bearing play and running noise, the winding for signs of heat, and the bell's concentricity after hard landings.