• EMAX ECOII 4215 brushless motor with lead wires, EMAX box, mounting screws, washer and lock nut
  • ECOII series multirotor brushless motor side view with threaded shaft and attached power wires
  • EMAX ECOII 4215 brushless motor top view showing rotor vents, copper windings, and threaded shaft
  • Brushless motor with included hardware: lock nut, washer and four mounting screws beside motor
  • ECOII series motor profile close-up showing etched can branding and exposed copper windings
  • Motor and accessory set on white background with washer, lock nut, and four mounting screws
  • Bottom mounting base close-up with copper windings and 350KV marking on the motor mount
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EMAX ECOII 4215 Brushless Motor 6-12S 350KV 420KV 520KV 660KV 12N14P M6 CW Shaft

EMAX ECOII 4215 Brushless Motor 6-12S 350KV 420KV 520KV 660KV 12N14P M6 CW Shaft

Emax

$65.34 USD
$65.34 USD
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Overview

EMAX ECOII 4215 is a brushless motor series offered in 350KV / 420KV / 520KV / 660KV options, specified for 6–12S LiPo setups depending on KV. It uses a 12N14P framework and is specified with a 13" propeller.

Key Features

  • Precision bearing
  • Steel shaft
  • Anodizing
  • 30 x 30 mm hole pattern
  • Multi-strand winding
  • 300 mm 16 AWG silicone wire

Specifications

Mechanical

Framework 12N14P
Motor dimensions φ49.1 x 65.35 mm
Length 65.35 mm
Diameter 49.1 mm
Bearing shaft 6 mm
Prop adapter shaft thread M6
Shaft thread CW
Lead 16#AWG 300 mm
Propeller 13"
Weight 209 g (W/O Silicone Wire)

Electrical (by KV option)

KV No. of cells Idle current (10V) Internal resistance Peak current Max power Weight
350KV 6–12S 1.0 A 62 mΩ 71 A (12S) 3408 W (12S) 209 g (W/O Silicone Wire)
420KV 6–10S 1.2 A 49 mΩ 81 A (10S) 3240 W (10S) 209 g (W/O Silicone Wire)
520KV 6–8S 1.9 A 38 mΩ 75 A (10S) 2400 W (10S) 209 g (W/O Silicone Wire)
660KV 6S 2.3 A 26 mΩ 90 A (10S) 2250 W (10S) 210 g (W/O Silicone Wire)

Thrust Test Data

ECOII-4215-350KV (48 V)

Gemfan1310 3-blade propeller

Voltage (V) Current (A) Thrust (g) Power (W) Efficiency (g/W) Speed (RPM)
48 2.67 870 128.16 6.79 4270
48 5.6 1540 268.80 5.73 5570
48 9.97 2370 478.56 4.95 6800
48 15.8 3250 758.40 4.29 7910
48 23.5 4260 1128.00 3.78 9010
48 33.2 5250 1593.60 3.29 9940
48 45.3 6230 2174.40 2.87 10860
48 62.2 7500 2985.60 2.51 Max

HQ 1309 3-blade propeller

Voltage (V) Current (A) Thrust (g) Power (W) Efficiency (g/W) Speed (RPM)
48 3.03 1020 145.44 7.01 4210
48 6.38 1790 306.24 5.85 5460
48 11.4 2680 547.20 4.90 6650
48 17.9 3600 859.20 4.19 7710
48 26.8 4650 1286.40 3.61 8740
48 37.4 5680 1795.20 3.16 9650
48 50.9 6700 2443.20 2.74 10510
48 70.7 8130 3393.60 2.40 Max

13x4 2-blade propeller

Voltage (V) Current (A) Thrust (g) Power (W) Efficiency (g/W) Speed (RPM)
48 1.5 520 72.00 7.22 4540
48 3.07 980 147.36 6.65 5910
48 5.52 1580 264.96 5.96 7300
48 8.9 2260 427.20 5.29 8610
48 13.6 3080 652.80 4.72 9880
48 19.4 3950 931.20 4.24 11020
48 26.6 4920 1276.80 3.85 12110
48 36.2 6080 1737.60 3.50 Max

ECOII-4215-420KV (40 V)

Gemfan1310 3-blade propeller

Voltage (V) Current (A) Thrust (g) Power (W) Efficiency (g/W) Speed (RPM)
40 3.16 870 126.40 6.88 4250
40 6.6 1520 264.00 5.76 5530
40 11.8 2310 472.00 4.89 6750
40 18.6 3170 744.00 4.26 7830
40 27.8 4160 1112.00 3.74 8890
40 38.8 5120 1552.00 3.30 9820
40 52.7 6100 2108.00 2.89 10690
40 71.3 7250 2852.00 2.54 Max

HQ 1309 3-blade propeller

Voltage (V) Current (A) Thrust (g) Power (W) Efficiency (g/W) Speed (RPM)
40 3.62 1040 144.80 7.18 4180
40 7.57 1790 302.80 5.91 5410
40 13.4 2650 536.00 4.94 6580
40 21 3520 840.00 4.19 7620
40 31.1 4510 1244.00 3.63 8650
40 43.2 5500 1728.00 3.18 9540
40 58.5 6520 2340.00 2.79 10360
40 80.6 7840 3224.00 2.43 Max

13x4 2-blade propeller

Voltage (V) Current (A) Thrust (g) Power (W) Efficiency (g/W) Speed (RPM)
40 1.8 500 72.00 6.94 4520
40 3.62 950 144.80 6.56 5890
40 6.48 1520 259.20 5.86 7250
40 10.4 2190 416.00 5.26 8540
40 15.9 2980 636.00 4.69 9800
40 22.7 3810 908.00 4.20 10940
40 31 4710 1240.00 3.80 12010
40 42 5780 1680.00 3.44 Max

ECOII-4215-520KV (32 V) — HQ 1309 3-blade propeller

Voltage (V) Current (A) Thrust (g) Power (W) Efficiency (g/W) Speed (RPM)
32 1.49 406 47.68 8.52 2760
32 3.91 928 125.12 7.42 3996
32 7.92 1562 253.44 6.16 5131
32 13.6 2260 435.20 5.19 6165
32 21.1 3032 675.20 4.49 7116
32 30.4 3810 972.80 3.92 8009
32 41.8 4602 1337.60 3.44 8848
32 55.2 5360 1766.40 3.03 9578
32 73.9 6350 2364.80 2.69 Max

ECOII-4215-660KV (25 V) — HQ 1309 3-blade propeller

Voltage (V) Current (A) Thrust (g) Power (W) Efficiency (g/W) Speed (RPM)
25 0.49 66 12.25 5.39 1522
25 2.18 374 54.50 6.86 2847
25 5.73 892 143.25 6.23 4078
25 11.5 1551 287.50 5.39 5187
25 19.8 2260 495.00 4.57 6185
25 30.9 3020 772.50 3.91 7085
25 43.8 3750 1095.00 3.42 7920
25 60.3 4561 1507.50 3.03 8672
25 78.6 5310 1965.00 2.70 9360
25 85.3 5980 2132.50 2.80 Max

What’s Included

  • 4x M4 x 12 screw
  • 1x Steel M6 nylock nut
  • 1x Paddle gasket

Support

For KV selection and 6–12S/propeller matching guidance for the ECOII 4215 brushless motor, contact support@rcdrone.top or visit https://rcdrone.top/.

Details

EMAX ECOII 4215 brushless motor dimension drawing with 30×30 mm mount pattern and M6 CW shaft thread

Designed around a 12N14P framework, the ECOII 4215 uses a 30×30 mm mounting pattern and an M6 CW shaft for common multirotor builds.

ECOII-4215 specifications table showing 350KV, 420KV, 520KV and 660KV options with recommended LiPo cell counts

Choose the KV option to match your voltage and prop setup, with 350KV through 660KV variants covering 6–12S configurations depending on model.

Thrust test chart for ECOII-4215 350KV at 48V with Gemfan 1310 and HQ 1309 props, current and efficiency data

Performance data for the 350KV version lists thrust, current draw, power, efficiency, and RPM across multiple 13-inch propeller choices.

Thrust test data table for ECOII-4215 420KV at 40V using 13-inch propellers, showing thrust, watts, and RPM by current

The 420KV test results provide a quick reference for expected thrust and efficiency at 40V with popular 13-inch prop combinations.

ECOII-4215 520KV thrust test table at 32V with HQ 1309 three-blade propeller, including efficiency and RPM columnsECOII-4215 660KV thrust test table at 25V with HQ 1309 three-blade propeller, listing thrust, power, efficiency and RPM

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