EMAX ECO II 3115 Brushless Motor 400KV
by EMAX

The EMAX ECO II 3115 400KV motor is built for endurance, stability, and heavy-lift performance in long-range or cinematic drone builds. With a large 3115 stator and 400KV winding, it runs efficiently on 10–12S LiPo systems using 9–12″ propellers, delivering around 1,970 W of power. It features precision dual NSK bearings, a balanced CNC-machined aluminum bell, high-temp multi-strand copper windings, and advanced cooling. Low internal resistance (~0.130 Ω) and an idle current of only ~0.6 A ensure smooth throttle control and reliable efficiency in demanding flights.

Specifications:
• KV Rating: 400KV
• Stator Size: 31 × 15 mm (3115)
• Voltage Range: 10–12S LiPo
• Recommended Propeller: 10″
• Max Current: ~41 A (at 12S)
• Max Power Output: ~1,970 W
• Internal Resistance: ~0.130 Ω
• Idle Current (10V): ~0.6 A
• Shaft Diameter: 5 mm
• Mounting Pattern: 16 × 16 mm (M3 bolts)
• Weight: ~107 g (no wire)
• Construction: Anodized CNC bell, NSK bearings, high-temp copper winding
• Includes: Motor and hardware kit
• Ideal For: Long-range FPV, heavy-lift, aerial cinematography, endurance drone platforms