ECO II 4720 Brushless Motor

Product Code: ECOII4720290

Availability:In stock

$65.99

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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.

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