2 to 4-inch FPV motor
EMAX E3 1404
A 9.9 g micro motor for 2 to 4-inch quads: 14 × 4 mm stator, 9N12P, N52SH magnets and single-strand windings, with up to 471 g of pull per motor at full throttle on EMAX’s 16 V bench (4800KV).
- 3 to 4-inch freestyle and long range
- 2 to 3.5-inch racing (6000KV)
- 4S (all three KVs; 6000KV from 2S)
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 1404 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
- 9.9 g
- with leads
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What you get
471 g at 16 V
At full throttle on 16 V, EMAX’s bench test of the 4800KV gave 471 g on an HQ 3 × 1.6 three-blade, drawing 16.87 A (269.92 W).
Source: EMAX USA product page
9.9 g with leads
EMAX weighs the motor at 9.9 g with its 120 mm, 24 AWG leads; the bell is anodised 7075 aluminium.
Source: EMAX USA product page
N52SH magnets, single-strand windings
EMAX uses high-temperature N52SH arc magnets in a one-piece outer rotor, and single-strand windings, which it says lower resistance and heat under load.
Source: EMAX USA product page
NSK bearings, steel shaft
A steel shaft runs in NSK precision bearings, which EMAX says cut noise and vibration at high rpm.
Source: EMAX USA 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 rates the peak current on 4S at 14.2 A (3700KV), 16.9 A (4800KV) and 19.8 A (6000KV); its best full-throttle bench results drew up to 19.77 A. A 20 A ESC covers all three. (EMAX USA product page)
- Props
- 3 to 4-inch props for the 3700KV and 4800KV, 2 to 3.5-inch for the 6000KV. EMAX’s best 16 V results came on a GF 3.5 × 2.0 three-blade (3700KV, 426 g), an HQ 3 × 1.6 three-blade (4800KV, 471 g) and an HQ 2.2 × 2 three-blade (6000KV, 439 g). (EMAX USA product page)
- Battery
- 3S–4S for the 3700KV and 4800KV, 2S–4S for the 6000KV; EMAX gives every KV’s peak figures on 4S. (EMAX USA product page)
- Frame
- Four M2 holes on a 9 mm circle; M2 screws in 5, 6 and 6.5 mm lengths come in the box. (EMAX USA product page)
Where to buy
- EMAX USAthe maker’s US store; same price for every KV (all three were listed as sold out)$17.99seen Oct 19, 2026Visit
Plain links, not affiliate links. Prices change; the store’s page has the current one.
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 4,800 rpm/V (also 3700KV and 6000KV) | EMAX USA product page |
| Stator | 14 × 4 mm (1404) | EMAX USA product page |
| Configuration | 9N12P (9 stator slots, 12 magnet poles) | EMAX USA product page |
| Battery | 3S–4S LiPo (3700KV, 4800KV); 2S–4S (6000KV) | EMAX USA product page |
| Weight | 9.9 g (with leads) | EMAX USA product page |
| Dimensions | φ19.1 × 17.4 mm | EMAX USA product page |
| Shaft | Steel, 1.5 mm prop shaft; 2 mm through the bearings | EMAX USA product page |
| Mounting | 4 × M2 holes on a 9 mm circle (9 × 9 mm) | EMAX USA product page |
| Bell | 7075 aluminium, anodised; one-piece outer rotor | EMAX USA product page |
| Magnets | N52SH arc magnets | EMAX USA product page |
| Bearings | NSK precision bearings (EMAX gives no size) | EMAX USA product page |
| Winding | Single-strand | EMAX USA product page |
| Internal resistance | 157 mΩ (3700KV 238 mΩ, 6000KV 103 mΩ) | EMAX USA product page |
| Idle current | 0.8 A (at 8 V; 3700KV 0.6 A at 10 V, 6000KV 1.0 A at 7 V) | EMAX USA product page |
| Peak current | 16.9 A (on 4S; 3700KV 14.2 A, 6000KV 19.8 A, both on 4S) | EMAX USA product page |
| Max power | 270 W (on 4S; 3700KV 228 W, 6000KV 316 W, both on 4S) | EMAX USA product page |
| Leads | 24 AWG silicone wire, 120 mm | EMAX USA product page |
| In the box | 5 × M2×5 mm, 5 × M2×6 mm and 3 × M2×6.5 mm screws | EMAX USA 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, 1.5 mm prop shaft; 2 mm through the bearings. (EMAX USA product page)
- Bell. 7075 aluminium, anodised; one-piece outer rotor. (EMAX USA product page)
- Magnets. N52SH arc magnets. (EMAX USA product page)
- Stator. The coils are wound on a stack of thin steel laminations: 14 × 4 mm (1404). (EMAX USA product page)
- Winding. Single-strand. (EMAX USA product page)
- Bearings. NSK precision bearings (EMAX gives no size). (EMAX USA product page)
- Base. 4 × M2 holes on a 9 mm circle (9 × 9 mm). (EMAX USA product page)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 4800KV 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 | 71,040 | 7,104 Hz | 42,624 |
| 4S full | 16.8 | 80,640 | 8,064 Hz | 48,384 |
| 6S nominal | 22.2 | 106,560 | 10,656 Hz | 63,936 |
| 6S full | 25.2 | 120,960 | 12,096 Hz | 72,576 |
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 × 4 mm stator, 19.1 mm bell, 1.5 mm shaft, 9 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.