Emax USA

EMAX E3 3115 Brushless Motor

$49.89 USD Sold out
KV
Notes
EMAX / ECO III SERIES

EMAX ECO III 3115

A 12N14P external-rotor platform for 8- to 10-inch FPV aircraft, available in four windings from high-voltage endurance builds to responsive freestyle configurations.

Built for high power that lasts.AL 7075 anodized construction, steel shaft, precision bearing support and winding options spanning 4S through 12S.
Framework12N14PExternal-rotor architecture
Motor size38.8 × 48.6Millimeters
Weight range108–111 gWithout silicone wire
Propeller range8–10 inVariant dependent
EMAX ECO III 3115 brushless motor built for durable high-power FPV operation
01 / Choose Your KV

Four windings for 4S through 12S systems.

Choose the winding around the complete aircraft, voltage, propeller, ESC and cooling requirements.

400KV10–12S · 10-inch propeller
640KV6S–8S · 10-inch propeller
900KV4S–6S · 10-inch propeller
1050KV4S–6S · 8–9-inch propeller
EMAX ECO III 3115 KV selection guide for 400KV, 640KV, 900KV and 1050KV
02 / Maximum Bench Results

Highest recorded thrust in each supplied test sheet.

KV Test propeller Voltage Current Thrust Power
400KV HQ 10×5×3 48 V 35.4 A 4630 g 1699.2 W
640KV HQ 10×5×3 32 V 58.2 A 4760 g 1862.4 W
900KV GF 10×5×3 25 V 73.4 A 4580 g 1835 W
1050KV HQ 9×5×3 25 V 87.8 A 4750 g 2195 W

Maximum-throttle bench results from the supplied EMAX load-test sheets. Results are configuration-dependent and are not guaranteed aircraft-level performance.

03 / Motor Construction

Material choices focused on durability and response.

The ECO III 3115 combines an AL 7075 anodized rotor housing, steel shaft, arc magnets, copper winding and precision bearing support in a compact external-rotor platform.

Exploded EMAX ECO III 3115 construction showing steel shaft, anodized housing, magnet ring, copper-wound stator and precision bearing
04 / Platform Details

Compact 3115 geometry with a 19 × 19 mm mounting pattern.

Framework 12N14P
Overall dimensions Ø38.8 × 48.6 mm
Variant weight 108–111 g without silicone wire
Propeller shaft M5 clockwise thread
Bearing shaft 5 mm
Mounting pattern 19 × 19 mm, M3
Leads 270 mm, 18 AWG silicone wire
AL 7075 housingAnodized aluminum rotor construction.
Steel shaftM5 clockwise propeller thread.
Precision bearingG1-level rolling-element specification.
Four power profiles400KV, 640KV, 900KV and 1050KV.
EMAX ECO III 3115 high-performance FPV motor platform
05 / Electrical Specifications

Published limits by winding.

KV Cells Propeller Weight Idle current at 10 V Resistance Peak current Maximum power
400KV 10–12S 10 in 109 g 0.6 A 141 mΩ 36 A at 12S 1728 W at 12S
640KV 6S–8S 10 in 111 g 1.2 A 64 mΩ 59 A at 8S 1888 W at 8S
900KV 4S–6S 10 in 108 g 1.7 A 42 mΩ 77 A at 6S 1925 W at 6S
1050KV 4S–6S 8–9 in 110 g 2.1 A 35 mΩ 88 A at 6S 2200 W at 6S

Weights exclude silicone wire.

06 / In The Box

Installation hardware included.

EMAX ECO III 3115 motor with mounting screws, lock nut, propeller screw and washer
  • 1 × ECO III 3115 motor
  • 5 × M3×10 mounting screws
  • 1 × aluminum M5 nylock nut
  • 1 × propeller screw
  • 1 × washer

Bench-test note: Performance values are measured test data, not guaranteed aircraft-level performance. Current draw, thrust, efficiency, RPM and temperature vary with propeller, battery voltage and sag, ESC behavior, airflow, ambient conditions and test equipment. Higher KV, larger propellers and higher voltage increase system load; select the motor winding, propeller, ESC, battery and cooling for the complete aircraft.
Product information

All parts are shipped fast from SYRACUSE, NEW YORK & some DROP SHIP ORDERS from San Diego, California. If there's an issue with something, please let us know and we will do our best make it right! SaltCtyRacingFPV, LLC dba "weBLEEDfpv.com" offers a (30) day return policy on all new unopened equipment, starting from the date the product(s) was delivered to the customer. Anything beyond (30) days of delivery will not be eligible for return. If the product(s) received have been opened, used or damaged, no return options will be offered. If the item is in brand new condition but requires to be repackaged, a (15%) restocking fee will be applied. The shipping cost for any unwanted product will not be refunded by SaltCtyRacingFPV "weBLEEDfpv.com" (It is recommended to choose a return shipping method with tracking).

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Please email at SaltCtyRacingFPV@gmail.com to contact us and initiate a return. Please contact us first before sending anything back. 

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Flight Controller / VTX Warranty Policy
 
At weBLEEDfpv, we are committed to providing high-quality products. However, due to the technical nature of flight controllers and VTX's the precision required for installation, our warranty policy for flight controllers is as follows:
 
1. No Warranty Post-Soldering: 
   Once any soldering has been performed on the flight controller / VTX's, we are no longer responsible for replacements, repairs, or refunds. The process of soldering can introduce various factors that may lead to damage, and we are unable to control or verify the conditions in which the soldering was conducted.
   
2. Pre-Soldering Inspection: 
   Before you begin soldering, we recommend carefully inspecting the flight controller  / VTX's for any potential issues. If any defects or issues are found prior to soldering, please contact us immediately for a replacement.
 
3. User Responsibility: 
   Soldering requires skill and experience, and improper techniques may result in damage to the flight controller, including but not limited to overheating or lifting solder pads. Please ensure you are confident in your soldering abilities before proceeding, as we cannot be held liable for any damages caused during installation.
 
4. Final Sale: 
   All flight controller sales are final once the product has been modified or soldered. We are unable to offer returns or exchanges on used or modified products.
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⚠️ FPV DIGITAL SYSTEM NOTICE

HDZero, Walksnail, VTX systems, and ultra-micro FPV electronics generate heat quickly while powered and require proper handling during setup and troubleshooting.

Bench setup without airflow/cooling can result in excessive heat buildup.

Once powered, configured, firmware updated, soldered, flown, or modified, products are considered used.

Manufacturer warranty may apply for BNF drones and electronic systems.

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Lithium Ion Battery No Acceptance Policy

For our lithium ion battery products, all sales are final. This means:

  • No Returns or Exchanges: Once your purchase is completed, we do not accept returns, exchanges, or cancellations.
  • Customer Responsibility: Please review all product specifications and details carefully before making your purchase.
  • Safety and Compliance: Due to safety standards and regulatory guidelines, we cannot process any post-sale modifications.

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Thank you for your understanding.

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