3–3.5-inch FPV motor
EMAX ECO 1407
A 1407 micro motor for 3–3.5-inch quads: 9N12P, 13.7 g without leads, an M5 prop shaft and a 12 × 12 mm M2 mount, in 2800KV, 3300KV and 4100KV.
- 3–3.5-inch quads
- 4S (2800KV), 3S (3300KV) or 2S–3S (4100KV)
- 3 to 4-inch props
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 1407 motor drawn from EMAX’s published sizes, not its exact design. No-load speed is KV × 14.8 V, a nominal pack for this version. EMAX publishes no bench data for it.
- Weight
- 13.7 g
- without leads
from $12.99a motor at EMAX USA
A set of four: $51.96
Price seen Oct 19, 2026. Plain links: we earn nothing from them.
What you get for $12.99
13.7 g
13.7 g without leads, on an 18.8 mm bell.
Source: EMAX product page, EMAX spec sheet
M5 prop shaft
An M5-threaded prop adapter stands 12.5 mm above the bell, for 3 to 4-inch props.
Source: EMAX spec sheet, EMAX product page
Three windings
All three are rated for 2S–4S; EMAX USA pitches the 2800KV at 4S, the 3300KV at 3S and the 4100KV at 2S–3S.
Source: EMAX spec sheet, EMAX USA 2800KV page, EMAX USA 3300KV page, EMAX USA 4100KV page
Steel shaft, anodised finish
A steel shaft, which EMAX says adds strength, and an anodised finish against corrosion.
Source: EMAX product page
What to pair it with
Our reading of EMAX’s numbers, so your build matches what the motor was tested with.
- ESC
- EMAX gives peak currents of 13.6 A (2800KV), 17.7 A (3300KV) and 21.6 A (4100KV), labelled “(10S)” with no voltage. A 25 A ESC covers all three. (EMAX spec sheet)
- Props
- EMAX lists 3 to 4-inch props for the 2800KV and 3300KV, and 3 to 3.5-inch props for the 4100KV. (EMAX spec sheet)
- Battery
- EMAX rates all three for 2S–4S. EMAX USA pitches the 2800KV at 4S or high-voltage 3S, the 3300KV at 3S and the 4100KV at 2S or low-voltage 3S. (EMAX spec sheet, EMAX USA 2800KV page, EMAX USA 3300KV page, EMAX USA 4100KV page)
- Frame
- Four M2 holes on a 12 mm circle (12 × 12 mm), which EMAX says fits standard micro and toothpick frames. (EMAX spec sheet, EMAX USA 2800KV page)
Where to buy
- EMAX USAthe maker’s US store; 2800KV (each KV has its own page at the same price)$12.99seen Oct 19, 2026Visit
- EMAXthe maker’s global store; all three KVs$20.00seen Oct 19, 2026Visit
- RaceDayQuads2800KVprice on the store’s pageVisit
- RaceDayQuads3300KVprice on the store’s pageVisit
- RaceDayQuads4100KVprice on the store’s pageVisit
Plain links, not affiliate links. Prices change; the store’s page has the current one.
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 2,800 rpm/V (also 3300KV and 4100KV) | EMAX product page |
| Stator | 14 × 7 mm (1407) | EMAX product page |
| Configuration | 9N12P (9 stator slots, 12 magnet poles) | EMAX product page |
| Battery | 2S–4S LiPo (all three KVs) | EMAX spec sheet |
| Weight | 13.7 g (without leads) | EMAX product page |
| Dimensions | φ18.8 × 31.2 mm overall; 25.5 mm from the shaft tip to the bottom of the bell | EMAX spec sheet |
| Shaft | Steel; M5-threaded prop adapter protruding 12.5 mm; 2 mm through the bearings | EMAX product page, EMAX spec sheet |
| Mounting | 4 × M2 holes on a 12 mm circle (12 × 12 mm) | EMAX spec sheet, EMAX product page |
| Bearings | Precision ball bearings | EMAX product page |
| Winding | Multi-strand copper | EMAX product page |
| Internal resistance | 180 mΩ (3300KV 148 mΩ, 4100KV 102 mΩ) | EMAX spec sheet |
| Idle current | 0.7 A (at 10 V; 3300KV 0.9 A, 4100KV 1.1 A) | EMAX spec sheet |
| Peak current | 13.6 A (EMAX’s sheet labels it “(10S)” and gives no voltage; 3300KV 17.7 A, 4100KV 21.6 A) | EMAX spec sheet |
| Max power | 220 W (also labelled “(10S)”; 3300KV 280 W, 4100KV 340 W) | EMAX spec sheet |
| Leads | 26 AWG silicone wire, 90 mm | EMAX spec sheet, EMAX product page |
Inside the motor
A brushless outrunner: the coils stand still in the middle and the magnets spin around them. From the top down:
- Shaft. Steel; M5-threaded prop adapter protruding 12.5 mm; 2 mm through the bearings. (EMAX product page, EMAX spec sheet)
- Stator. The coils are wound on a stack of thin steel laminations: 14 × 7 mm (1407). (EMAX product page)
- Winding. Multi-strand copper. (EMAX product page)
- Bearings. Precision ball bearings. (EMAX product page)
- Base. 4 × M2 holes on a 12 mm circle (12 × 12 mm). (EMAX spec sheet, EMAX product page)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 2800KV version reaches about these speeds; a prop loads the motor and brings it down, typically to around 70–75% of these figures at full throttle.
| Battery | Volts | No-load rpm (KV × V) | Electrical frequency | ESC steps per second |
|---|---|---|---|---|
| 4S nominal | 14.8 | 41,440 | 4,144 Hz | 24,864 |
| 4S full | 16.8 | 47,040 | 4,704 Hz | 28,224 |
| 6S nominal | 22.2 | 62,160 | 6,216 Hz | 37,296 |
| 6S full | 25.2 | 70,560 | 7,056 Hz | 42,336 |
A 12-pole rotor has 6 pole pairs, so every turn of the shaft is 6 electrical cycles, and a six-step ESC switches the phases 36 times per turn.
About the 3D model
A generic outrunner drawn from EMAX’s published sizes: the 14 × 7 mm stator, 18.8 mm bell, 18.7 mm height, 5 mm shaft, 12 mm mounting circle and 9 teeth and 12 magnets. Anything EMAX doesn’t publish is typical for a motor this size, and the bell’s spoked top, the base and the inside are a generic design, not this motor’s. The colours are read off the maker’s product photos. There are no logos or markings: it is our drawing, not the maker’s.
Sources
- EMAX: ECO Micro Series 1407 2800KV 3300KV 4100KV (product page on EMAX’s global store). Retrieved Oct 19, 2026.
- EMAX: ECO 1407 spec sheet (dimension drawing and spec table for each KV; image on EMAX’s product pages). Retrieved Oct 19, 2026.
- EMAX USA: ECO Micro Series 1407 2800KV (product page). Retrieved Oct 19, 2026.
- EMAX USA: ECO Micro Series 1407 3300KV (product page). Retrieved Oct 19, 2026.
- EMAX USA: ECO Micro Series 1407 4100KV (product page). Retrieved Oct 19, 2026.
