EMAX / ECO II series

ECO II 3214

The EMAX ECO II 3214 brushless motor brings four KV options to 8–10-inch multirotor builds. The 450KV version is specified for 12S, 800KV and 900KV for 6–8S, and 1050KV for 6S. Each shares a 132g-with-wire platform, 12N14P architecture, M5 propeller shaft and 19 × 19mm four-hole mount.

Tested output shown: 450KV with HQ1050 tri-blade at 47.5V on a static bench. Performance varies by propeller, voltage and build.

Weight132gWith 270mm wires

Power system6S–12SKV-dependent support

Propeller range8–10″KV-dependent recommendation

KV options4450 / 800 / 900 / 1050KV

Designed for the build

One mounting footprint. Four power systems.

The 39.1mm-diameter, 49.8mm-long platform lets you choose a winding for your voltage and propeller while retaining the same 19 × 19mm mount. Match the ESC and battery to the selected KV; the family-wide 8–10-inch propeller range does not apply to every variant.

ECO II 3214 KV guide: 450KV 12S, 800KV and 900KV 6–8S, and 1050KV 6S, with propeller ranges and separately labeled bench thrust

Swipe to explore all four KV options →

Each thrust figure is the maximum recorded in that version’s supplied load-test file. Different props and test voltages mean these are not direct head-to-head results.

Find your winding

Four KV options. One mounting footprint.

Voltage and propeller ranges come from the supplied specifications. The thrust figure on each card is the highest recorded in that KV’s supplied bench file, with its test voltage and propeller shown—not a same-condition comparison between variants.

450KV

12S choice for the 9–10-inch propeller range.

Cells12S

Propeller9–10″

Resistance103mΩ

Recorded max thrust5,637g47.5V · HQ1050 tri-blade

800KV

6–8S option for 9–10-inch multirotor configurations.

Cells6–8S

Propeller9–10″

Resistance40mΩ

Recorded max thrust5,477g31.1V · HQ9050 tri-blade

900KV

6–8S choice with an 8–10-inch published propeller range.

Cells6–8S

Propeller8–10″

Resistance35mΩ

Recorded max thrust4,698g23.2V · HQ1050 tri-blade

1050KV

Highest-KV option, specified for 6S and 8–9-inch props.

Cells6S

Propeller8–9″

Resistance27mΩ

Recorded max thrust4,470g23.3V · GF9045 tri-blade

Thrust is per motor, measured on a static test bench at full throttle. Test voltage, propeller, current and power differ by row; do not treat these figures as a controlled head-to-head KV ranking or a guaranteed in-flight result.

ECO II 3214 shared 132g motor platform with 19 by 19mm mount, 270mm 16 AWG leads, 39.1mm diameter, 49.8mm length and four KV options

Swipe to read the platform details →

Weight is 132g with wire. The shared mechanical platform is specified across 450KV, 800KV, 900KV and 1050KV.

Motor anatomy

Fitment and construction, clearly marked.

The 3214 uses a steel M5 propeller shaft, ventilated anodized bell, multi-strand winding, precision bearing and a 19 × 19mm four-hole M3 mount. Its 270mm 16 AWG silicone leads leave room to route to the ESC.

12N14PMotor architecture

6mmBearing shaft

19 × 19mm4 × M3 mounting pattern

270mm16 AWG silicone leads

Annotated ECO II 3214 hardware: steel M5 shaft, ventilated rotor bell, multi-strand windings, precision bearing, 19 by 19mm four-hole mount and 270mm 16 AWG leads

Swipe to inspect the hardware callouts →

Specifications

Mechanical and electrical details.

Shared hardware specifications apply across all four KV choices. Electrical resistance and idle current change with the winding.

Shared mechanical specification

Motor dimensions	Ø39.1 × 49.8mm
Weight	132g, with wire
Framework	12N14P
Bearing shaft	6mm
Prop shaft	M5, clockwise thread
Mounting pattern	19 × 19mm, 4 × M3
Motor lead	270mm, 16 AWG silicone wire

By KV option

450KV	12S · 9–10″ prop · 103mΩ · 0.9A idle at 10V
800KV	6–8S · 9–10″ prop · 40mΩ · 2.0A idle at 10V
900KV	6–8S · 8–10″ prop · 35mΩ · 2.2A idle at 10V
1050KV	6S · 8–9″ prop · 27mΩ · 2.8A idle at 10V

Measured performance

Bench results, with the conditions attached.

These are the highest-thrust full-throttle rows recorded for each KV in the supplied load-test workbooks. Current and power are input readings at the listed loaded voltage.

Motor	Propeller	Loaded voltage	Thrust	Current	Power	Speed
450KV	HQ1050 tri-blade	47.5V	5,637g	55.86A	2,653.35W	15,784RPM
800KV	HQ9050 tri-blade	31.1V	5,477g	87.26A	2,713.79W	17,720RPM
900KV	HQ1050 tri-blade	23.2V	4,698g	79.82A	1,851.82W	15,297RPM
1050KV	GF9045 tri-blade	23.3V	4,470g	86.29A	2,010.56W	18,222RPM

Swipe table sideways for thrust, current, power and RPM →

Static test values are conditional on the listed propeller, loaded voltage and test setup. The 450KV result was recorded at 47.5V (approximately 12S), the 800KV result at 31.1V (approximately 8S), and the 900KV and 1050KV results at 23.2V and 23.3V (approximately 6S). Actual output, temperature and endurance depend on the full build.

ECO II 3214 package with one motor, four M3 by 10mm screws and one aluminum M5 nylock nut

Swipe to read the package contents →

In the box

Motor and mounting hardware.

Each package includes one ECO II 3214 motor in the selected KV, four M3 × 10mm mounting screws and one aluminum M5 nylock nut. A propeller, ESC and battery are not listed as included.

EMAX ECO II 3214 brushless multirotor motor. Specifications and bench measurements transcribed from the supplied ECOII-3214 V1.0 basic-information, specification and KV load-test workbooks. Confirm propeller clearance, ESC capacity and thermal behavior in the completed aircraft. Graphics are based on supplied 3214 product photos; shared hardware appearance is representative of the motor family.

EMAX ECO II 3214 Brushless Motor