How to match an electric motor to an RC aircraft
A practical guide to motor KV, voltage, current, thrust, aircraft weight and flight style so the power system matches the model.
Freewing 8S 4075-1390Kv Brushless Inrunner Motor: a recreational RC product. Model details and specifications are listed below.
| Brand | Freewing |
|---|---|
| Model | Freewing 8S 4075-1390Kv Brushless Inrunner Motor |
| Manufacturer SKU | MI040753 |
| Motor Type | Inrunner |
| Kv Rating (RPM/Volt) | 1390Kv |
| Continuous Current | NA |
| Maximum Burst Current | NA |
| Recommended Battery (Input Voltage) | 8S (29.6V) |
| Recommended ESC | 150A |
| Recommended Propeller / EDF | 90mm 12-Blade |
| Shaft Length (B) | 21mm |
| Motor Length (C) | NA |
| Motor Diameter (D) | NA/p> |
| Overall Length (E) | NA |
| Weight | 404g / 14.2oz |
| Connector Type | NA |
Availability, price and package contents are confirmed on inquiry. Specify the required model and version so radio, battery and equipment compatibility can be checked.
These guides explain the setup, safety checks and accessory choices that usually matter for this product type.
A practical guide to motor KV, voltage, current, thrust, aircraft weight and flight style so the power system matches the model.
Diameter, pitch, motor load, current measurement and how propeller choice changes thrust, speed, efficiency and heat.
ESC selection by maximum current, voltage, BEC, safety margin, cooling, connector choice and the real load from motor and propeller.
A step-by-step safety guide for measuring amps, watts and voltage sag so customers avoid overheating motors, ESCs and LiPo batteries.
A safety and performance guide to propeller balance, spinner fit, bent shafts, motor mounts, firewall checks and protecting electronics from vibration.
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