Emax ECOII 3115 400KV / 500KV / 640KV / 800KV / 900KV Brushless Motor for FPV Racing Drone
About EMAX ECO II 3115 Motor:
The EMAX ECO II 3115 Motor delivers reliable, high-performance power with KV options (400KV, 500KV, 640KV, 900KV) to suit diverse drone setups. Its durable design and advanced cooling ensure efficiency and longevity, making it a versatile choice for upgrades or new builds.
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Top highlights
Large stator size for powerful thrust: Ideal for 9–12" props and heavy-lift builds.
Multiple KV options: 400KV to 900KV, tailored for various flight needs.
High efficiency with premium magnets: Faster response and smoother control.
Durable and crash-resistant: Reinforced bell design and precision bearings.
Excellent value: Performance close to premium motors at a lower price.
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Powerful Thrust for Heavy-Lift Applications
The 3115 stator size (31mm diameter x 15mm height) is engineered for drones carrying heavy payloads like cinema cameras or large batteries. It pairs perfectly with 9–12" props, delivering efficient lift and stable flight for long-range or cinematic missions.
Versatile KV Range for Different Setups
400KV / 500KV: Suited for 10–12S LiPo setups, maximizing efficiency in endurance builds.
640KV: A balanced choice for 6–8S builds, ideal for both range and agility.
800KV / 900KV: Best for 4–6S builds where agility and responsiveness matter.
This range makes the ECO II 3115 suitable for everything from long-range explorers to freestyle cinematics.
High-Efficiency Magnetic Design
Equipped with N52SH arc magnets, this motor offers stronger magnetic force and quicker response than typical N48 designs. This means faster throttle reactions, greater torque, and better flight precision.
Durable Construction for Real-World Flying
The rounded bell shape helps deflect impact forces, reducing damage from crashes. It also features NSK precision bearings, known for their reliability and smooth operation under load.
Precision Manufacturing for Flight Stability
Emax is known for tight tolerances and balanced rotors. This results in minimal vibration, reduced noise, and consistent performance — key for smooth cinematic footage.
Specifications
Data Test
400KV
Recommended Propeller: 10"
Idle Current (10V): 0.6A
Internal Resistance: 130
Voltage Range: 10-12S
Max Power: 1970W
Peak Current: 41A
500KV
Recommended Propeller: 10"
Idle Current (10V): 0.8A
Internal Resistance: 95
Voltage Range: 8-10S
Max Power: 1960W
Peak Current: 49A
640KV
Recommended Propeller: 10"
Idle Current (10V): 1.2A
Internal Resistance: 66m
Voltage Range: 6-8S
Max Power: 2016W
Peak Current: 63A
800KV
900KV
Recommended Propeller: 10"
Idle Current (10V): 0.6A
Internal Resistance: 130
Voltage Range: 10-12S
Max Power: 1970W
Peak Current: 41A
Recommendations
Reviews
a**********6
Excellent quality and fast shipping. Highly recommended!
Model：900KV
Purchased 2 times
Additional reviews after 3
days
Fast shipping and excellent product.
a**********6
Excellent quality and fast shipping. Highly recommended!
Model：900KV
Purchased 2 times
L***s
Verified
Shipping was very fast, arrived earlier than I thought.
Model：500KV
L*********R
Verified
Très bon moteur pour du long range. Bon rendement et fonctionnement très fluide en vol.
Model：500KV
Purchased 2 times
d*******x
Verified
Powerful and smooth motor, good for long range build. Affordable option.
Model：640KV
t******v
Verified
Highly satisfied with the product, the buyers gave it a 5-star rating.
Model：400KV
Additional reviews after 24
days
nice motor. very powerfull for 10 inch longrange.
m***********v
Verified
Running the 640KV on a 10-inch X8 build, it’s a beast for heavy lift work. Motors arrived well-packed in foam boxes, no bent shafts or scratches.
Model：640KV
F***x
Verified
Die Motoren kamen in makellosem Zustand an — sehr gute Verpackung, sogar mit Einzelhüllen.
Model：900KV
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FAQFeel free to ask us any questions
Q: Who is the EMAX ECO II 3115 motor best suited for?
A: This motor is designed for FPV pilots building long-range, cinematic, or heavy-lift drones, especially those using 7–10 inch or larger propeller setups where efficiency and torque are critical.
Q: What type of drones is this motor commonly used on?
A: It is commonly used on 7–10 inch long-range drones, cine-lifters, and heavy payload builds carrying action cameras or cinema rigs. (Mepsking)
Q: What makes the 3115 stator size special?
A: The large 31x15mm stator provides higher torque and better efficiency, allowing the motor to spin larger propellers smoothly and carry heavier loads with stable performance. (Mepsking)
Q: How do I choose the right KV for my setup?
A: Lower KV options like 400KV–500KV are ideal for high-voltage (10–12S) long-range efficiency, while higher KV options like 800KV–900KV are better suited for 4–6S setups requiring more responsiveness. (Mepsking)
Q: Is this motor suitable for beginners?
A: It is more suitable for intermediate to advanced pilots, as large motors are typically used in complex builds that require proper tuning and power system understanding.
Verified