Product overview
The EMAX E3 3115 is a propulsion component for FPV aircraft, with four KV choices that require different battery and propeller combinations. The 400KV version pairs 10-12S power with a 10 inch propeller, while 640KV uses 6-8S with the same propeller size. The 900KV configuration specifies 4-6S and 10 inch propellers; 1050KV retains 4-6S but specifies 8-9 inch propellers. These combinations support applications ranging from long-range and high-load aircraft to cinematic and freestyle builds. Battery selection therefore depends on the selected motor variant.
The motor occupies a 38.8 mm diameter by 48.6 mm length envelope and attaches through a 19 x 19 mm M3 mounting pattern. Its construction combines a steel shaft, AL 7075 anodized housing, one-piece outer rotor, N52SH arc magnets, single-strand winding and a G1-level precision bearing. Integration interfaces include a 5 mm bearing shaft, M5 prop adapter thread, CW shaft thread and 270 mm 18 AWG silicone lead. Variant weights span 108-111 g without that wire. Supplied hardware comprises five M3 x 10 screws, an aluminum M5 nyloc nut, and a shaft washer and screw.
Specifications
| Specification | Value & conditions |
|---|---|
| Manufacturer and model | EMAX E3 3115 Brushless Motor |
| Product purpose | Brushless propulsion motor for 8-10 inch FPV platforms, with 400KV, 640KV, 900KV and 1050KV options. |
| Framework | 12N14P |
| Length | 48.6 mm |
| Diameter | 38.8 mm |
| Battery cells — 400KV | 10-12S400KV configuration. |
| Battery cells — 640KV | 6-8S640KV configuration. |
| Battery cells — 900KV | 4-6S900KV configuration. |
| Battery cells — 1050KV | 4-6S1050KV configuration. |
| Recommended propeller | 8-10 inch |
| Weight — 400KV | 109 g without silicone wire400KV configuration; without silicone wire. |
| Weight — 640KV | 111 g without silicone wire640KV configuration; without silicone wire. |
| Weight — 900KV | 108 g without silicone wire900KV configuration; without silicone wire. |
| Weight — 1050KV | 110 g without silicone wire1050KV configuration; without silicone wire. |
| Prop adapter shaft thread | M5 |
| Bearing shaft | 5 mm |
| Shaft thread | CW |
| Mounting pattern | 19 x 19 mm, M3 |
| Motor lead | 270 mm 18 AWG silicone wire |
| Shaft and housing construction | Steel shaft and AL 7075 anodized housing. |
| Rotor, magnets and winding | One-piece outer rotor, N52SH arc magnets and single-strand winding. |
| Bearing construction | G1-level rolling-element precision bearing |
| Supplied hardware | 5 x M3 x 10 screws; 1 x aluminum M5 nyloc nut; 1 x washer and screw for shaft.Included equipment. |
| 400KV electrical and propeller configuration |
|
| 640KV electrical and propeller configuration |
|
| 900KV electrical and propeller configuration |
|
| 1050KV electrical and propeller configuration |
|
| Stator size | 3115 |
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