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.
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.
Published electrical limits come from the supplied EMAX specification workbook. Tested thrust values are the highest recorded values in the matching load-test workbooks.
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.
Each bar shows the highest thrust recorded in the supplied test workbook for that winding. All bars share a 7.323kg scale.
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.
A 6mm bearing section supports the rotating assembly, while the M5 CW threaded propeller interface provides secure retention.
Anodized metal surfaces provide a durable finish for regular installation and service.
A four-hole 19 × 19mm pattern accepts M3 mounting hardware at the airframe interface.
Multi-strand winding is specified for the high-current operating range of this large outrunner.
A three-bearing support system promotes smooth, concentric shaft rotation under sustained propeller load.
Long silicone motor leads provide routing flexibility during FPV power-system installation.
| 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 |
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.
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.
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 |
The expandable tables show the final, highest-load row from each propeller set in the supplied workbooks.
| 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.
| 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.
| 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.
Package contents: one EMAX ECO II 3220 brushless motor, four M3 × 10mm mounting screws and one aluminum M5 nylock nut.
