Firma 3900Kv 4-pole Brushless Motor

The Spektrum Firma 3900Kv 4-pole Brushless Motor (SPMXSM3300) is a 3660-size, sensorless upgrade for 1/10 scale 4WD models seeking high RPM performance on 2-3S (up to 12.6V). A low-cog 4-pole rotor, CNC-machined aluminium housing and high-purity copper windings deliver smooth, efficient power and durability. High-precision bearings and a 5mm alloy steel output shaft support reliable running, while preinstalled 4mm gold-plated bullets make installation straightforward. Suggested compatibility includes the Spektrum Firma 130 Smart ESC; the 85A Firma ESC is suggested for 2S use.

Features

• Low-cog 4-pole rotor design for smooth start-up
• CNC-machined aluminium housing
• Insulated high-purity copper windings
• High-quality alloy steel 5mm output shaft
• High-precision bearings for smooth rotation
• Preinstalled 4mm gold-plated bullet connectors
• Sensorless, brushless design

Specifications

• Application: 1/10 scale surface
• Motor class: 1/10 scale
• Outer diameter: 1.4 in (36 mm)
• Product length: 2.35 in (60 mm)
• Shaft diameter: 0.2 in (5 mm)
• Input voltage: 2-3S / up to 12.6V
• RPM/Volt (Kv): 3900Kv
• Kv rating: 3000Kv or more
• Maximum continuous current: 45A
• Constant wattage: 500-749W
• Sensor type: Sensorless
• Motor type: Brushless
• Motor output lead: 4mm
• Connector type: 4mm bullet
• Integrated ESC: No

In The Box

• (1) Spektrum Firma 3660-3900Kv Sensorless 1/10 Brushless Motor with 4mm Gold Plated Bullet Connectors
• (1) Product Manual

Needed to Complete

• Electronic Speed Control such as the Firma 130 Smart ESC