Principles of electric motor selection

General principles of electric motor selection - Principles of electric motor selection:

• On average, it is assumed that for 1kg of trainer aircraft you need about 200W of engine power - for an aerobat it is 400W and a 3D model min 500W
• For training models and models that do not require a lot of excess power, the upper limit of the recommended model weight given in the technical data is used.
• For aerobatic models, aerobatic mock-ups, high-speed models and models with a need for more excess power, the lower limit of the recommended model weight given in the technical data is used.
• With fewer power cells, the drive will have lower rpm and, depending on the diameter of the propeller, higher or lower current draw (larger diameter - higher current draw).
• With more power cells, the drive will have a higher RPM and, depending on the diameter of the propeller, a higher or lower current draw (larger diameter - higher current draw).
• Propellers with smaller diameters, and thus higher rotational speed, result in higher model speed.
• Propellers with larger diameters, and thus lower rotational speed, result in lower model speed.
• The higher the current consumption, the shorter the operating time of the drive unit, resulting in the need to replace power sources more often.
• The use of a drive with more power cells, on the one hand, increases the power of the drive unit, but on the other hand, the demand for this power increases due to the higher total weight. Therefore, using the maximum number of power cells does not always give the best results. This principle is especially applicable to lightweight models (up to 2000g).