The EMAX ECO II 5215 is a large-format brushless outrunner for long-range FPV, heavy-lift multirotors and cinematic aircraft using 13- to 17-inch propellers. Five windings—230KV, 260KV, 300KV, 360KV and 420KV—cover 6S through 12S systems around a 12N14P architecture, M6 propeller interface and four-hole 30 × 30mm airframe mount.
Five KV options. One 5215 platform.230KV / 260KV / 300KV / 360KV: 8S–12S420KV: 6S–8SPublished propeller range: 13–17 inches
Motor weight341gIncluding 400mm leads
Motor sizeØ60.6mm65.7mm overall length
Mount30 × 30mmExactly four M4 holes
Framework12N14PLarge outrunner architecture
Large-prop power across five windings. Official EMAX bench sheets recorded up to 9.32kg of thrust, while the 230KV through 420KV range lets builders match the motor to 6S–12S aircraft configurations.
01 / KV Selection
Match winding, voltage and propeller load.
Electrical limits come from the official ECO II 5215 specification sheet. Bench highlights use the maximum-throttle rows from the matching EMAX load-test sheets.
Select from the complete aircraft backward. Match KV to battery voltage, propeller load, ESC rating, aircraft mass, airflow and required thrust. Validate the final system under realistic thermal conditions.
02 / Performance Envelope
Maximum recorded thrust by winding.
230KV
9.32kg
260KV
9.14kg
300KV
8.40kg
360KV
9.27kg
420KV
7.47kg
Maximum values are configuration-dependent bench results from the supplied EMAX load-test sheets.
03 / Construction
Large-outrunner hardware with precision support.
01 / SHAFT
Steel M6 Shaft
A CW-threaded M6 propeller interface and 6mm bearing section support the rotating assembly.
02 / ROTOR
Anodized Rotor Bell
A rigid outer bell rotates with the shaft around a full-height 14-pole magnet ring.
03 / STATOR
12-Slot Wound Stator
Dense multi-strand copper windings form the fixed 12-slot stator.
04 / BEARING
Precision Bearing
Concentric bearing support promotes smooth rotation under sustained propeller load.
05 / MOUNT
Four-Hole Mount
The 30 × 30mm base has exactly four M4 airframe mounting holes.
06 / LEADS
400mm 14 AWG Leads
Long silicone motor leads provide routing flexibility in large aircraft.
04 / Mechanical Data
5215 geometry and installation details.
Motor model
EMAX ECO II 5215
Framework
12N14P
Motor diameter
Ø60.6mm
Overall length
65.7mm
Weight
341g with wire
Bearing shaft
Ø6mm
Propeller shaft
M6 CW thread
Mounting pattern
30 × 30mm, four M4 holes
Motor leads
400mm 14 AWG silicone wire
Propeller range
13–17 inches, KV-dependent
One platform, five power profiles.
The shared 5215 mechanical package lets builders select winding and voltage without changing the four-hole airframe interface.
The official drawing specifies 60.6mm diameter, 65.7mm overall length and a 30 × 30mm four-M4 mounting pattern.
Installation note: Confirm frame clearance, screw engagement, propeller retention, ESC headroom and cooling before operation.
05 / Electrical Specifications
KV-specific published limits.
Use the 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
230KV
8S–12S
17"
0.8A @ 10V
55mΩ
76.3A
3412W
260KV
8S–12S
15"
0.9A @ 10V
50mΩ
69.2A
3266W
300KV
8S–12S
13–17"
1.2A @ 10V
41mΩ
72.1A
3396W
360KV
8S–12S
13–17"
1.4A @ 10V
32mΩ
87.4A
3894W
420KV
6S–8S
13–15"
1.7A @ 10V
26mΩ
77.7A
2412W
06 / Bench Data
Maximum-throttle load-test highlights.
Expand a winding to view the maximum-throttle row from every propeller series in the official EMAX sheets.
230KV Load-Test Highlights17-inch / three propellers
Voltage
Propeller
Current
Thrust
Power
Efficiency
RPM
44.85V
HQ1708, 3-blade
65.66A
9,131g
2944.85W
3.10g/W
8,381
44.71V
GF1708, 3-blade
76.31A
9,320g
3411.82W
2.73g/W
7,911
44.54V
1708, 2-blade
66.92A
8,499g
2980.62W
2.85g/W
8,250
260KV Load-Test Highlights15-inch / two propellers
Voltage
Propeller
Current
Thrust
Power
Efficiency
RPM
47.21V
HQ1507, 3-blade
69.18A
9,139g
3265.99W
2.80g/W
9,776
47.40V
GF1507, 3-blade
56.00A
8,261g
2654.40W
3.11g/W
9,845
300KV Load-Test Highlights8S–12S / four propellers
Voltage
Propeller
Current
Thrust
Power
Efficiency
RPM
47.11V
HQ1309, 3-blade
72.09A
7,994g
3396.16W
2.35g/W
11,598
47.23V
1507, 2-blade
65.15A
8,399g
3077.03W
2.73g/W
11,680
31.37V
HQ1708, 3-blade
56.87A
7,425g
1784.01W
4.16g/W
7,554
31.29V
GF1708, 3-blade
64.08A
7,956g
2005.06W
3.97g/W
7,377
360KV Load-Test Highlights8S–12S / four propellers
