Emax ECOII 3115 900KV 10inch Frame Brushless FPV Motor (Set of 4)
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EMAX ECOII 3115 900KV Brushless Motor — The Ultimate Choice for Long-Range 10-Inch FPV Drones
When it comes to high-performance long-range FPV drones, every gram, every watt, and every revolution counts. At the heart of such drones lies the motor—an uncompromising component that dictates efficiency, thrust, flight time, and responsiveness. The EMAX ECOII 3115 900KV brushless motor is a purpose-built powerhouse engineered to deliver superior torque, cooler operations, and extended endurance for 10-inch propeller platforms on 6S LiPo or Li-ion setups.
Emax ECO II 3115 Optimized for 5–6S power setups and 9–10″ propellers
Emax ECO II 3115 Overview Overview
The Emax ECOII 3115 900KV is designed for high-thrust applications where a balance between agility and payload capacity is required. It’s best suited for long-range FPV drones or cinematic rigs that run on 5S to 6S LiPo setups.
Key Specifications
| Parameter | Value |
| KV Rating | 900 KV |
| Voltage Range | 5–6 S LiPo |
| Max Current | ~85 A |
| Internal Resistance | ~0.042 Ω |
| Recommended Prop | 9–10 inch |
| Motor Mount | 19 × 19 mm pattern |
| Shaft Diameter | 4 mm |
| Weight | ~106–110 g (with wires) |
The ECOII 3115 900KV motor is optimized to handle the load of 10-inch propellers with high torque at lower RPMs. This enables:
Improved low-end throttle control for smooth cinematic flights
Maximized efficiency for long-range and endurance builds
Better thermal stability under continuous high-load usage
Lower current draw compared to 1200KV+ motors at equivalent thrust
Performance Metrics
Below are indicative figures using a 10×4.5 inch bi-blade propeller on 6S 4200mAh Li-ion:
| Throttle % | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
| 25% | 2.1 A | 230 g | 46.2 W | 4.98 |
| 50% | 4.6 A | 560 g | 101.2 W | 5.53 |
| 75% | 8.2 A | 870 g | 180.4 W | 4.82 |
| 100% | 13.5 A | 1220 g | 297 W | 4.10 |
Ideal flight throttle range: 45-60% for long-range endurance with balanced thrust and battery usage.
Built for Durability
Thicker bell design resists bending during crash landings
CNC precision-machined aluminum alloy ensures structural integrity
NSK bearings offer smoother rotation and longevity
High-temperature-resistant magnets ensure consistent performance during extended flights
Multi-strand single wrap winding enables cooler operation under load
Emax ECO II 3115 OverviewNotable Features
Premium N52SH Arc Magnets: Delivers high torque and RPM stability even under load
CNC-Machined Bell with Reinforcement Ribs: Increases crash durability
NSK Bearings: Ensures low-friction, smooth, and quiet operation
High Temperature Copper Windings: Improves efficiency and longevity under high load
Top-tier performance for 7–10 inch FPV drones
Ideal Use Case
7–10 inch long-range quads
Cinematic drones carrying GoPros or similar payloads
Heavy freestyle or endurance builds