EMAX ECO II 4720 Brushless Motor 290KV
by EMAX

The EMAX ECO II 4720 Brushless Motor (290KV) is a high-output, large-scale FPV and UAV brushless motor purpose-built for heavy-lift aerial platforms, commercial sUAS airframes, and 12S high-voltage 15-inch propeller aircraft setups. Built on EMAX's durable ECO II architecture, this 4720-class stator motor delivers maximum sustained torque and efficiency for demanding long-range builds, cinematic rigs, and heavy-payload drones.

Constructed with a 12N14P stator framework, multi-strand windings, an anodized structural housing, an 8mm bearing shaft, and a durable steel main shaft, the motor outputs up to 3696W of maximum power and a 77A peak current on 12S voltage. Outfitted with an M6 threaded propeller shaft, 360mm heavy-duty 13AWG silicone leads, and a standard 30x30mm M4 mounting pattern, the ECO II 4720 290KV provides smooth throttle response, high thermal stability, and low-voltage drop for high-voltage heavy-rig applications.

Key Features

• 4720-Class Heavy-Lift Performance: Engineered for large-format FPV aircraft, macro freestyle builds, commercial UAVs, and 15-inch propeller systems.

• 12S High-Voltage Rating (290KV): Optimized for 12S LiPo battery configurations, producing up to 3696W of power.

• Robust Hardware Construction: Features an 8mm bearing shaft, precision steel main shaft, multi-strand windings, and an anodized finish for thermal efficiency under heavy loads.

• Extended Lead Wires: Pre-wired with 360mm 13AWG silicone wires for direct connection to large-frame ESCs.

• Standard 30x30mm Mount: Features 4 x M4 mounting holes for universal integration on heavy-lift drone arms.

Technical Specifications

• Brand / Manufacturer: EMAX

• Model Series: ECO II 4720

• KV Rating: 290KV

• Stator Dimensions: 47 mm x 20 mm

• Overall Motor Dimensions: 55.1 mm (Diameter) x 71 mm (Length)

• Stator Architecture / Framework: 12N14P

• Operating Voltage: 12S LiPo

• Recommended Propeller Size: 15-inch (e.g., HQ 15x7 3-blade)

• Maximum Continuous Power: 3696 W @ 12S

• Peak Current: 77 A @ 12S

• Idle Current: 1.7 A @ 10 V

• Internal Resistance: 47 mΩ

• Bearing Shaft Diameter: 8 mm

• Propeller Adapter Thread: M6 CW Shaft Thread

• Mounting Hole Pattern: 30 mm x 30 mm (4 x M4 Threaded Holes)

• Lead Wire Gauge & Length: 13 AWG Silicone Wire, 360 mm

• Net Weight: 324 grams (without silicone wires)

What Is Included

• (1) EMAX ECO II 4720 Brushless Motor (290KV)

• (4) M4 x 14 mm Screws

• (1) Steel M6 Nyloc Nut

• (1) Propeller Washer / Paddle Gasket