ECO II SERIES / LONG-RANGE FPV POWER

Brushless Motor Platform

EMAX ECO II 3220

The EMAX ECO II 3220 is a high-output external-rotor brushless motor for 8- to 11-inch FPV and multirotor propellers. Three winding options—500KV, 700KV and 1000KV—cover 6S through 12S power systems. Its 12N14P architecture, 39.1mm diameter, 55.8mm length, M5 threaded propeller shaft and 19 × 19mm mounting pattern create a compact propulsion platform for demanding large-prop builds.

Three KV options. One 3220 platform. 500KV for 12S high-voltage systems. 700KV for 6S–8S, 10- to 11-inch builds. 1000KV for 6S–8S, 8- to 10-inch builds.

Motor weight171gIncluding silicone wire

System range6S–12SKV-dependent battery support

Propeller8–11"KV-dependent propeller range

Framework12N14PLarge outrunner architecture

EMAX ECO II 3220 brushless motor for 8- to 11-inch FPV aircraft with 500KV, 700KV and 1000KV options

Compact high-voltage propulsion. The 500KV configuration is specified for 12S, and the supplied 47.32V bench test recorded 7.323kg thrust with an HQ 1050 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.

500KV

12S / 10- to 11-inch propeller
High-voltage winding for efficient large-prop operation.

Peak current74.4A

Max power3520W

Resistance58mΩ

Idle current1.5A @ 10V

Bench highlight: 7.323kg thrust at 47.32V with HQ 1050 three-blade; 74.39A / 3520.1W.

700KV

6S–8S / 10- to 11-inch propeller
Balanced winding for medium-voltage long-range builds.

Peak current82.8A

Max power2589W

Resistance36mΩ

Idle current2.3A @ 10V

Bench highlight: 6.276kg thrust at 31.28V with HQ 1145 three-blade; 81.52A / 2549.9W.

1000KV

6S–8S / 8- to 10-inch propeller
Highest-RPM winding for smaller propeller choices.

Peak current127.4A

Max power3987W

Resistance22mΩ

Idle current3.8A @ 10V

Bench highlight: 5.867kg thrust at 23.40V with HQ 1050 three-blade; 117.76A / 2755.6W.

EMAX ECO II 3220 KV selection guide for 500KV, 700KV and 1000KV motors with 8- to 11-inch propellers

Swipe horizontally to compare all three 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 a 7.323kg scale.

500KV47.32V

7.323kg

700KV31.28V

6.276kg

1000KV23.40V

5.867kg

Maximum values were recorded with HQ 1050 or HQ 1145 three-blade propellers, depending on KV. Bench results are configuration-dependent and are not guaranteed aircraft-level performance.

03 / Construction

Compact hardware supported by three precision bearings.

01 / SHAFT

Steel Shaft

A 6mm bearing section supports the rotating assembly, while the M5 CW threaded propeller interface provides secure retention.

02 / FINISH

Anodized Structure

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

03 / MOUNT

19 × 19mm Pattern

A four-hole 19 × 19mm pattern accepts M3 mounting hardware at the airframe interface.

04 / WINDING

Multi-Strand Winding

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

05 / BEARING

Three Precision Bearings

A three-bearing support system promotes smooth, concentric shaft rotation under sustained propeller load.

06 / LEADS

270mm 16 AWG Wire

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

Exploded EMAX ECO II 3220 motor showing M5 steel propeller shaft, full-height 14-pole magnet ring, 12-slot copper-wound stator, three precision bearings and 19 by 19 millimeter mounting base

Swipe horizontally to inspect the component callouts

04 / Mechanical Data

3220 geometry and installation details.

Motor model	EMAX ECO II 3220
Framework	12N14P
Motor diameter	Ø39.1mm
Motor length	55.8mm
Weight	171g with wire
Bearing shaft	Ø6mm
Propeller shaft	M5 threaded
Shaft direction	CW thread
Mounting pattern	19 × 19mm, four M3 holes
Motor leads	270mm 16 AWG silicone wire
Propeller specification	8–11 inches, KV-dependent
KV options	500KV / 700KV / 1000KV
Precision bearings	Three

One platform, three voltage profiles.

The shared mechanical package allows builders to select KV around the intended battery voltage and propeller without changing the motor's basic 19 × 19mm airframe interface.

The complete product family spans 6S–12S. Each KV option has its own cell-count and propeller guidance in the electrical table below.

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

EMAX ECO II 3220 motor platform for 8- to 11-inch FPV aircraft with three KV options

Serious output with practical value. The ECO II 3220 combines one compact mechanical platform with three winding choices for builders matching voltage, propeller size, current and thrust targets.

05 / Electrical Specifications

KV-specific operating limits.

Use only the published voltage and propeller range for the selected winding. Confirm ESC current capability and thermal headroom for the complete aircraft.

KV	Cells	Propeller	Idle Current	Resistance	Peak Current	Max Power
500KV	12S	10–11"	1.5A @ 10V	58mΩ	74.4A	3520W
700KV	6S–8S	10–11"	2.3A @ 10V	36mΩ	82.8A	2589W
1000KV	6S–8S	8–10"	3.8A @ 10V	22mΩ	127.4A	3987W

06 / Bench Data

Maximum recorded propeller results.

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

500KV Load-Test Highlights47V / Three propellers

Voltage	Propeller	Current	Thrust	Power	Efficiency	RPM
47.39V	Gemfan 1050, 3-blade	66.47A	6823g	3150.0W	2.17g/W	18,420
47.32V	HQ 1050, 3-blade	74.39A	7323g	3520.1W	2.08g/W	17,832
47.32V	HQ 1145, 3-blade	71.56A	7242g	3386.2W	2.14g/W	18,010

Final 100% throttle row from each supplied 500KV propeller series.

700KV Load-Test Highlights31V / Three propellers

Voltage	Propeller	Current	Thrust	Power	Efficiency	RPM
31.32V	Gemfan 1050, 3-blade	76.58A	5745g	2398.5W	2.40g/W	16,779
31.26V	HQ 1050, 3-blade	82.84A	5978g	2589.6W	2.31g/W	16,314
31.28V	HQ 1145, 3-blade	81.52A	6276g	2549.9W	2.46g/W	16,392

Final 100% throttle row from each supplied 700KV propeller series.

1000KV Load-Test Highlights23–31V / Five propellers

Voltage	Propeller	Current	Thrust	Power	Efficiency	RPM
23.51V	Gemfan 9045, 3-blade	87.22A	4612g	2050.5W	2.25g/W	9,294
23.46V	HQ 9050, 3-blade	105.98A	5361g	2486.3W	2.16g/W	8,752
23.42V	Gemfan 1050, 3-blade	110.62A	5829g	2590.7W	2.25g/W	8,327
23.40V	HQ 1050, 3-blade	117.76A	5867g	2755.6W	2.13g/W	8,004
31.29V	Gemfan 8 × 8E, 2-blade	127.42A	4595g	3987.0W	1.15g/W	11,148

Final 100% throttle row from each supplied 1000KV propeller series. The 8 × 8E two-blade test used the higher 31.29V endpoint.

EMAX ECO II 3220 motor package with M3 by 10 millimeter mounting screws and an aluminum M5 nylock nut

Package contents: one EMAX ECO II 3220 brushless motor, four M3 × 10mm mounting screws and one aluminum M5 nylock nut.

07 / In The Box

Core installation hardware included.

1×EMAX ECO II 3220 brushless motor

4×M3 × 10mm mounting screws

1×Aluminum M5 nylock nut

EMAX ECO II 3220 Brushless Motor