The EMAX ECO II 4315 is a high-efficiency large brushless outrunner for 13- to 15-inch long-range FPV, heavy-lift multirotors and cinematic aircraft. Four windings—360KV, 380KV, 450KV and 520KV—cover published 6S through 8S applications around a 12N14P architecture, M6 propeller shaft and four-hole 30 × 30mm airframe mount.
Four KV options. One 4315 platform.360KV / 380KV / 450KV: 6S–8S520KV: 6SPublished propeller range: 13–15 inches
Motor weight245gIncluding 400mm leads
Motor sizeØ50.6mm63.7mm overall length
Mount30 × 30mmExactly four M4 holes
Framework12N14PLarge outrunner architecture
Four practical power profiles. Official EMAX bench sheets recorded up to 7.962kg of thrust across 360KV, 380KV, 450KV and 520KV windings.
01 / KV Selection
Match winding, voltage and propeller load.
Published application guidance and maximum-throttle highlights come from the official ECO II 4315 sheets.
360KV
6S–8S / 13–15-inch props
Idle current1.2A @ 10V
Resistance53mΩ
Published peak63.5A / 2992W
Bench: 7.962kg at 47.09V, GF1308 three-blade.
380KV
6S–8S / 13–15-inch props
Idle current1.3A @ 10V
Resistance51mΩ
Published peak72.9A / 2352W
Bench: 7.579kg at 32.27V, HQ1507 three-blade.
450KV
6S–8S / 13-inch props
Idle current1.6A @ 10V
Resistance43mΩ
Published peak75.4A / 2428W
Bench: 6.919kg at 32.24V, HQ1308 three-blade.
520KV
6S / 13-inch props
Idle current1.9A @ 10V
Resistance37mΩ
Published peak74.6A / 1792W
Bench: 5.420kg at 24.02V, HQ1310 three-blade.
02 / Performance Envelope
Maximum recorded thrust by winding.
360KV
7.962kg
380KV
7.579kg
450KV
6.919kg
520KV
5.420kg
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
The rigid outer bell surrounds a full-height 14-pole permanent-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 load.
05 / MOUNT
Four-Hole Mount
The 30 × 30mm base has exactly four M4 airframe mounting holes.
06 / LEADS
400mm 16 AWG Leads
Long silicone motor leads provide routing flexibility in large aircraft.
04 / Mechanical Data
4315 geometry and installation details.
Motor model
EMAX ECO II 4315
Framework
12N14P
Motor diameter
Ø50.6mm
Overall length
63.7mm
Weight
245g with wire
Bearing shaft
Ø6mm
Propeller shaft
M6 CW thread
Mounting pattern
30 × 30mm, four M4 holes
Motor leads
400mm 16 AWG silicone wire
Propeller range
13–15 inches, KV-dependent
One platform, four power profiles.
The shared 4315 package lets builders select a winding without changing the four-hole airframe interface.
The official drawing specifies 50.6mm diameter, 63.7mm overall length and a 30 × 30mm four-M4 mounting pattern.
