Spektrum RC Firma 4685 Sensorless Brushless Motor (1450kV) (4-8S)
About this part
Motor Overview:
The Spektrum™ Firma 4685 4-Pole Sensorless Brushless Motor is a high-performance replacement motor designed for the Arrma® Limitless 120 platforms. It's also an excellent option for other compatible platforms such as the Infraction 6S BLX when running on 6-8S power. Built for strength, efficiency, and smooth operation, this brushless motor delivers reliable torque and consistent speed for demanding RC applications.
About the Firma 4685 Brushless Motor
Precision & Power
Featuring a four-pole rotor design, the Firma 4685 provides superior torque and throttle response. Its CNC-machined aluminum housing ensures optimal heat dissipation and durability, while insulated high-purity copper windings promote efficient power transfer. The eight-millimeter alloy steel output shaft provides extra strength and smooth rotation, reducing wear over time. With preinstalled gold-plated bullet connectors, installation is quick and hassle-free, getting you back on the track faster.
Features:
- 4-8S LiPo power compatible for versatile performance
- 4-pole rotor design delivers strong torque and smooth control
- CNC-machined aluminum housing improves cooling and durability
- Insulated high-purity copper windings enhance efficiency
- 8mm alloy steel output shaft ensures strength and reliability
- Preinstalled 6.5mm gold-plated bullet connectors for easy setup
Includes:
- (1) Firma 4685 4-Pole Sensorless Brushless Motor
Specifications:
| Motor Type | Brushless |
|---|---|
| RPM/Volt (kV) | 1450kV |
| Input Voltage | 4-8S LiPo (14.8-29.6V) |
| Motor Size | 4685 |
| Poles | 4 |
| Length | 3.34in (85mm) |
| Diameter | 1.81in (46mm) |
| Shaft Length | 0.86in (22mm) |
| Shaft Diameter | 0.31in (8mm) |
| Weight | 27.33oz (775g) |
| Motor Connector | 6.5mm Bullets |