Emax USA

ECO II 4720 Brushless Motor

$65.99 USD
KV
2 in stock
Notes
EMAX / ECO II SERIES

EMAX ECO II 4720

A 324 g high-torque external-rotor platform for 15-inch aircraft, offered in 290KV and 380KV windings across 6S through 12S systems.

Two windings. Up to 10.39 kg tested thrust.Choose 290KV for the widest voltage range or 380KV for 6S–8S systems.
Framework12N14PExternal-rotor architecture
Motor size55.1 × 71Millimeters
Weight324 gWithout silicone wire
Propeller15 inBoth KV variants
EMAX ECO II 4720 brushless motor for 15-inch FPV aircraft with 290KV and 380KV options
01 / Choose Your KV

Match the winding to the voltage.

Both versions are specified for 15-inch propellers, with cell-count options spanning 6S through 12S.

290KV6–12S · 15-inch propeller
380KV6S–8S · 15-inch propeller
EMAX ECO II 4720 KV guide showing cell count and maximum recorded thrust for 290KV and 380KV
02 / Performance Envelope

Maximum recorded thrust by KV.

KV Test propeller Voltage Current Thrust Power
290KV HQ 15×7×3, 3-blade 48.0 V 76.5 A 10,387 g 3672.0 W
380KV HQ 15×7×3, 3-blade 33.6 V 70.3 A 7,693 g 2362.08 W

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 an 8 mm bearing shaft and precision bearings.

Exploded EMAX ECO II 4720 external-rotor motor showing M6 shaft, 14-pole magnet ring, 12-slot copper-wound stator, precision bearing support and 30 by 30 millimeter four-hole base
04 / Platform Details

4720 geometry and installation details.

Framework 12N14P
Overall dimensions Ø55.1 × 71 mm
Weight 324 g without silicone wire
Propeller shaft M6 clockwise thread
Bearing shaft 8 mm
Mounting pattern 30 × 30 mm, four holes
Leads 360 mm, 13 AWG silicone wire
Steel shaftM6 CW propeller thread.
Anodized finishPolished gunmetal rotor bell.
Multi-strand windingThree-phase copper-wound stator.
EMAX ECO II 4720 motor platform for 15-inch FPV aircraft with 290KV and 380KV options
05 / Electrical Specifications

KV-specific published limits.

KV Cells Propeller Idle current at 10 V Resistance Peak current Maximum power
290KV 6–12S 15 in 1.7 A 47 mΩ 77 A at 12S 3696 W at 12S
380KV 6S–8S 15 in 2.4 A 32 mΩ 72 A 2420 W
06 / In The Box

Core installation hardware included.

EMAX ECO II 4720 motor, four M4 by 14 millimeter screws, steel M6 nylock nut and propeller washer
  • 1 × ECO II 4720 motor
  • 4 × M4×14 mounting screws
  • 1 × steel M6 nylock nut
  • 1 × propeller washer

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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