Emax USA

EMAX ECOII 4215 Brushless Motor

$27.99 USD Sold out

Product variants

Notes

ECO II SERIES / LARGE MULTIROTOR POWER

Brushless Motor Platform

EMAX ECO II 4215

The EMAX ECO II 4215 is a high-output brushless motor platform for 13-inch multirotor propellers. Four winding options—350KV, 420KV, 520KV and 660KV—cover 6S through 12S power systems, while the 12N14P architecture, 49.1mm diameter, 65.35mm length, M6 threaded propeller shaft and 30 × 30mm mounting pattern provide a practical foundation for large multirotor propulsion.

Four KV options. One 4215 platform. 350KV for 6S–12S high-voltage systems. 420KV for 6S–10S power systems. 520KV for 6S–8S configurations. 660KV for responsive 6S configurations.

Motor weight209–210gExcluding silicone wire

System range6S–12SKV-dependent battery support

Propeller13"Published platform specification

Framework12N14PLarge outrunner architecture

EMAX ECO II 4215 brushless motor for 13-inch multirotors with 350KV, 420KV, 520KV and 660KV options

High-voltage 13-inch propulsion. The 350KV configuration supports up to 12S, and the supplied 48V bench test recorded as much as 8.13kg of thrust with an HQ 1309 three-blade propeller.

01 / KV Selection

Match voltage and winding to the aircraft.

Published electrical limits come from the supplied EMAX specification workbook. Tested thrust values are the highest recorded values in the matching load-test workbooks.

350KV

6S–12S / 13-inch propeller
Lowest-KV option for the widest voltage range.

Peak current71A @ 12S

Max power3408W

Resistance62mΩ

Idle current1.0A @ 10V

Bench highlight: 8.13kg thrust at 48V with HQ 1309 three-blade; 70.7A / 3393.6W.

420KV

6S–10S / 13-inch propeller
Balanced high-voltage option for large multirotors.

Peak current81A @ 10S

Max power3240W

Resistance49mΩ

Idle current1.2A @ 10V

Bench highlight: 7.84kg thrust at 40V with HQ 1309 three-blade; 80.6A / 3224W.

520KV

6S–8S / 13-inch propeller
Higher-RPM option for medium-voltage systems.

Peak current75A @ 8S

Max power2400W

Resistance38mΩ

Idle current1.9A @ 10V

Bench highlight: 6.35kg thrust at 32V with HQ 1309 three-blade; 73.9A / 2364.8W.

660KV

6S / 13-inch propeller
Highest-KV winding for dedicated 6S systems.

Peak current90A @ 6S

Max power2250W

Resistance26mΩ

Idle current2.3A @ 10V

Bench highlight: 5.98kg thrust at 25V with HQ 1309 three-blade; 85.3A / 2132.5W.

EMAX ECO II 4215 KV selection guide for 350KV, 420KV, 520KV and 660KV motors with 13-inch propellers

Swipe horizontally to compare all four KV options

Choose from the complete aircraft backward. Match motor KV to battery voltage, propeller load, ESC rating, aircraft mass, airflow and required thrust. Published ranges are selection guidance; validate the final power system under realistic thermal conditions.

02 / Performance Envelope

Maximum tested thrust by KV.

Each bar shows the highest thrust recorded in the supplied test workbook for that winding. All bars share an 8.13kg scale.

350KV48V

8.13kg

420KV40V

7.84kg

520KV32V

6.35kg

660KV25V

5.98kg

Maximum values above were recorded with an HQ 1309 three-blade propeller. Bench results are configuration-dependent and are not guaranteed aircraft-level performance.

03 / Construction

Practical hardware for sustained multirotor loads.

01 / SHAFT

Steel Shaft

Steel shaft construction supports the long M6 threaded propeller interface used by the 4215 platform.

02 / FINISH

Anodized Structure

Anodized metal surfaces provide a durable finish for regular installation and service.

03 / MOUNT

30 × 30mm Pattern

A four-hole 30 × 30mm mounting pattern provides a defined mechanical interface for the airframe.

04 / WINDING

Multi-Strand Winding

Multi-strand winding is specified for the high-current operating range of this large outrunner.

05 / BEARING

Precision Bearing

Precision bearing hardware supports smooth rotation under sustained propeller load.

06 / LEADS

300mm 16 AWG Wire

Long silicone motor leads provide routing flexibility during large-airframe power-system installation.

Exploded EMAX ECO II 4215 outer-rotor motor showing the steel M6 shaft, anodized rotor bell, full-height 14-pole magnet ring, 12-slot wound stator, precision bearing and 30 by 30 millimeter motor mount

Swipe horizontally to inspect the component callouts

04 / Mechanical Data

4215 geometry and installation details.

Motor model	EMAX ECO II 4215
Framework	12N14P
Motor diameter	Ø49.1mm
Motor length	65.35mm
Weight	209g; 660KV listed at 210g, without silicone wire
Bearing shaft	Ø6mm
Propeller shaft	M6 threaded
Shaft direction	CW thread
Mounting pattern	30 × 30mm, four-hole
Motor leads	300mm 16 AWG silicone wire
Propeller specification	13 inches
KV options	350KV / 420KV / 520KV / 660KV

One platform, four voltage profiles.

The shared mechanical package makes it possible to select a winding around the intended voltage without changing the motor's basic airframe interface.

The published 6S–12S envelope belongs to the complete product family. Each individual KV option has its own cell-count limit shown in the electrical table below.

Installation note: Confirm frame clearance, screw engagement, propeller retention, ESC headroom and cooling before operation.

EMAX ECO II 4215 large multirotor motor platform with four KV options

Performance without unnecessary complexity. The ECO II 4215 combines a consistent mechanical platform with four winding choices for large multirotor builders who need to match voltage, current and thrust targets.

05 / Electrical Specifications

KV-specific operating limits.

Use only the voltage range published for the selected winding. The 520KV and 660KV cell references below are reconciled with the supplied 32V and 25V test files and the published maximum-power values.

KV	Cells	Propeller	Idle Current	Resistance	Peak Current	Max Power
350KV	6S–12S	13"	1.0A @ 10V	62mΩ	71A @ 12S	3408W @ 12S
420KV	6S–10S	13"	1.2A @ 10V	49mΩ	81A @ 10S	3240W @ 10S
520KV	6S–8S	13"	1.9A @ 10V	38mΩ	75A @ 8S	2400W @ 8S
660KV	6S	13"	2.3A @ 10V	26mΩ	90A @ 6S	2250W @ 6S

06 / Bench Data

Maximum recorded propeller results.

The expandable tables show the final, highest-load row from each propeller set in the supplied workbooks.

350KV Load-Test Highlights48V / Three propellers

Voltage	Propeller	Current	Thrust	Power	Efficiency
48V	Gemfan 1310, 3-blade	62.2A	7500g	2985.6W	2.51g/W
48V	HQ 1309, 3-blade	70.7A	8130g	3393.6W	2.40g/W
48V	13 × 4 carbon-fiber, 2-blade	36.2A	6080g	1737.6W	3.50g/W

Final recorded row from each 350KV propeller series. RPM was marked "Max" rather than numerically reported at these endpoints.

420KV Load-Test Highlights40V / Three propellers

Voltage	Propeller	Current	Thrust	Power	Efficiency
40V	Gemfan 1310, 3-blade	71.3A	7250g	2852W	2.54g/W
40V	HQ 1309, 3-blade	80.6A	7840g	3224W	2.43g/W
40V	13 × 4 carbon-fiber, 2-blade	42.0A	5780g	1680W	3.44g/W

Final recorded row from each 420KV propeller series. RPM was marked "Max" rather than numerically reported at these endpoints.

520KV Load-Test Highlight32V / HQ 1309

Voltage	Propeller	Current	Thrust	Power	Efficiency
32V	HQ 1309, 3-blade	73.9A	6350g	2364.8W	2.69g/W

Final recorded row from the supplied 520KV load-test series.

660KV Load-Test Highlight25V / HQ 1309

Voltage	Propeller	Current	Thrust	Power	Efficiency
25V	HQ 1309, 3-blade	85.3A	5980g	2132.5W	2.80g/W

Final recorded row from the supplied 660KV load-test series.

EMAX ECO II 4215 motor package with four M4 by 12 millimeter screws, steel M6 nylock nut and propeller washer

Package contents: one EMAX ECO II 4215 brushless motor, four M4 × 12mm screws, one steel M6 nylock nut and one propeller washer.

07 / In The Box

Core installation hardware included.

1×EMAX ECO II 4215 brushless motor

4×M4 × 12mm mounting screws

1×Steel M6 nylock nut

1×Propeller washer

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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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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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.
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