Emax USA

EMAX ECOII 3520 Brushless Motor

$45.99 USD Sold out
KV
Notes
EMAX / ECO II SERIES

EMAX ECO II 3520

A 215 g external-rotor brushless platform for 12- to 15-inch aircraft, offered in four windings spanning 4S through 12S.

One platform. Four power profiles.330KV for high-voltage systems, 495KV and 560KV for 6S, and 770KV for 4S–5S builds.
Framework12N14PExternal-rotor architecture
Motor size42.5 × 72Millimeters
Weight215 gWith wires
Propeller range12–15 inVariant dependent
EMAX ECO II 3520 brushless motor for 12- to 15-inch FPV aircraft with 330KV, 495KV, 560KV and 770KV options
01 / Choose Your KV

Match the winding to the voltage and propeller.

Four windings cover low-voltage through high-voltage power systems without changing the 3520 mounting footprint.

330KV8–12S · 14–15-inch propellers
495KV6S · 12–14-inch propellers
560KV6S · 12–14-inch propellers
770KV4S–5S · 12–14-inch propellers
EMAX ECO II 3520 KV guide showing cell count, propeller range and maximum recorded thrust for 330KV, 495KV, 560KV and 770KV
02 / Performance Envelope

Maximum recorded thrust by KV.

KV Test propeller Voltage Current Thrust Power RPM
330KV GF 14×7, 2-blade 47.22 V 51.98 A 7120 g 2454.50 W 11269
495KV GF 14×7, 2-blade 24.62 V 45.124 A 4760 g 1110.95 W 9456.9
560KV GF 14×7, 2-blade 24.47 V 62.939 A 5610 g 1540.12 W 10191.9
770KV GF 12×6, 2-blade 20.46 V 65.678 A 4560 g 1343.77 W 11989.6

Maximum-throttle bench results from the supplied EMAX load-test sheets. Results are configuration-dependent and are not guaranteed aircraft-level performance.

03 / Motor Construction

External-rotor torque with a 12N14P magnetic circuit.

The permanent-magnet bell rotates around the fixed copper-wound stator, supported by a 6 mm bearing shaft and precision ball bearing.

Exploded EMAX ECO II 3520 external-rotor motor showing M6 shaft, 14-pole magnet ring, 12-slot copper-wound stator, precision bearing and 25 by 25 millimeter four-hole base
04 / Platform Details

3520 geometry and installation details.

Framework 12N14P
Overall dimensions Ø42.5 × 72 mm
Weight 215 g with wires
Propeller shaft M6 clockwise thread
Bearing shaft 6 mm
Mounting pattern 25 × 25 mm, 4 × M3 holes
Leads 95 mm, three phase leads
Steel shaftM6 CW propeller thread.
Anodized finishPolished gunmetal rotor bell.
Multi-strand windingThree-phase copper-wound stator.
EMAX ECO II 3520 motor platform for 12- to 15-inch FPV aircraft with four KV options
05 / Electrical Specifications

KV-specific published limits.

KV Cells Propeller Idle current at 10 V Resistance Peak current Maximum power
330KV 8–12S 14–15 in 0.8 A 88 mΩ 52 A at 12S 2454.5 W at 12S
495KV 6S 12–14 in 1.0 A 39 mΩ 45.1 A at 6S 1111 W at 6S
560KV 6S 12–14 in 1.3 A 31 mΩ 62.9 A at 6S 1540.1 W at 6S
770KV 4S–5S 12–14 in 1.9 A 21 mΩ 65.7 A at 5S 1343.8 W at 5S
06 / In The Box

Core installation hardware included.

EMAX ECO II 3520 motor and included motor mount, M3 screws, M6 nylock nut, propeller washer and female connectors
  • 1 × ECO II 3520 motor
  • 1 × motor mount
  • 5 × M3×6 screws
  • 1 × steel M6 nylock nut
  • 1 × propeller washer
  • 3 × 4.0 mm female connectors

Bench-test note: Performance values are measured test data, not guaranteed aircraft-level performance. Current draw, thrust, efficiency, RPM and temperature vary with propeller, battery voltage and sag, ESC behavior, airflow, ambient conditions and test equipment. Select the motor winding, propeller, ESC, battery and cooling appropriate for the complete aircraft.
Product information

All parts are shipped fast from SYRACUSE, NEW YORK & some DROP SHIP ORDERS from San Diego, California. If there's an issue with something, please let us know and we will do our best make it right! SaltCtyRacingFPV, LLC dba "weBLEEDfpv.com" offers a (30) day return policy on all new unopened equipment, starting from the date the product(s) was delivered to the customer. Anything beyond (30) days of delivery will not be eligible for return. If the product(s) received have been opened, used or damaged, no return options will be offered. If the item is in brand new condition but requires to be repackaged, a (15%) restocking fee will be applied. The shipping cost for any unwanted product will not be refunded by SaltCtyRacingFPV "weBLEEDfpv.com" (It is recommended to choose a return shipping method with tracking).

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Please email at SaltCtyRacingFPV@gmail.com to contact us and initiate a return. Please contact us first before sending anything back. 

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Flight Controller / VTX Warranty Policy
 
At weBLEEDfpv, we are committed to providing high-quality products. However, due to the technical nature of flight controllers and VTX's the precision required for installation, our warranty policy for flight controllers is as follows:
 
1. No Warranty Post-Soldering: 
   Once any soldering has been performed on the flight controller / VTX's, we are no longer responsible for replacements, repairs, or refunds. The process of soldering can introduce various factors that may lead to damage, and we are unable to control or verify the conditions in which the soldering was conducted.
   
2. Pre-Soldering Inspection: 
   Before you begin soldering, we recommend carefully inspecting the flight controller  / VTX's for any potential issues. If any defects or issues are found prior to soldering, please contact us immediately for a replacement.
 
3. User Responsibility: 
   Soldering requires skill and experience, and improper techniques may result in damage to the flight controller, including but not limited to overheating or lifting solder pads. Please ensure you are confident in your soldering abilities before proceeding, as we cannot be held liable for any damages caused during installation.
 
4. Final Sale: 
   All flight controller sales are final once the product has been modified or soldered. We are unable to offer returns or exchanges on used or modified products.
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⚠️ FPV DIGITAL SYSTEM NOTICE

HDZero, Walksnail, VTX systems, and ultra-micro FPV electronics generate heat quickly while powered and require proper handling during setup and troubleshooting.

Bench setup without airflow/cooling can result in excessive heat buildup.

Once powered, configured, firmware updated, soldered, flown, or modified, products are considered used.

Manufacturer warranty may apply for BNF drones and electronic systems.

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Lithium Ion Battery No Acceptance Policy

For our lithium ion battery products, all sales are final. This means:

  • No Returns or Exchanges: Once your purchase is completed, we do not accept returns, exchanges, or cancellations.
  • Customer Responsibility: Please review all product specifications and details carefully before making your purchase.
  • Safety and Compliance: Due to safety standards and regulatory guidelines, we cannot process any post-sale modifications.

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Thank you for your understanding.

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