3–3.5-inch FPV motor
Foxeer Datura 1404
A 14 × 4 mm, 9 g motor for 3- to 3.5-inch quads, 3850KV for 3S–4S or 4533KV for 2S–3S, that pulled 411–423 g at full throttle on 3-inch props on Foxeer's 14.8 V bench (3850KV).
- 3- to 3.5-inch quads
- 4S (3850KV) or 3S (4533KV)
- 9 × 9 mm M2 motor mounts
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 Foxeer’s published sizes, not its exact design. Thrust, current and power are Foxeer’s bench figures for the DAL T3028 prop at 14.8 V, read straight across between its throttle steps. Its data starts at 50% throttle.
- Max thrust
- 423 g
- DAL T3028 prop, 14.8 V
- Weight
- 9 g
- with 3 cm of wire; the same for both KVs
- Peak current
- 15.3 A
- full throttle
- Max power
- 226 W
- full throttle
Plain links: we earn nothing from them.
What it pulls
Foxeer’s own bench test, one line per prop. Drag across the chart to move the throttle; the model above follows.
At 60% with the DAL T3028: 205 g of thrust, 5.4 A, 80 W, 3.17 g per watt.
On your quad
2.6 : 1
Thrust to weight at full throttle: four motors pull 1,692 g with the DAL T3028 at 14.8 V.
At 60% throttle they pull 818 g, 1.3 times the quad’s weight.
All-up weight is the quad ready to fly, with its battery and camera. The thrust is the maker’s static bench figure; in the air it is lower.
What you get
About 420 g of pull on 4S
At full throttle at 14.8 V the 3850KV pulled 423 g on a DAL T3028 (15.3 A) and 411 g on a GF 3028×3 (13.3 A) on Foxeer's bench.
Source: Foxeer 3850KV spec sheet
9 g
Foxeer weighs both KVs at 9 g with 3 cm of wire.
N52H magnets
Foxeer lists N52H magnets.
Source: Foxeer feature image 2
260 °C windings
Single-wrap windings of single-crystal oxygen-free copper, in wire Foxeer rates for 260 °C.
Source: Foxeer feature image
What to pair it with
Our reading of Foxeer’s numbers, so your build matches what the motor was tested with.
- ESC
- Foxeer's max currents are 15.3 A for the 3850KV (DAL T3028 at 14.8 V) and 14.8 A for the 4533KV (DAL T3028 at 11.1 V), the highest draws on its bench. A 20 A ESC covers both. (Foxeer 3850KV spec sheet, Foxeer 4533KV spec sheet)
- Props
- Foxeer tested both KVs on three 3-inch props (DAL T3018, DAL T3028, GF 3028×3) and a 4-inch two-blade, the GF4×2×2. The 3850KV pulled the most on the DAL T3028 at 14.8 V (423 g); the 4533KV on the DAL T3028 at 11.1 V (350 g). (Foxeer 3850KV spec sheet, Foxeer 4533KV spec sheet)
- Battery
- 3S–4S for the 3850KV, tested at 11.1 V and 14.8 V; 2S–3S for the 4533KV, tested at 7.4 V and 11.1 V. (Foxeer 3850KV spec sheet, Foxeer 4533KV spec sheet)
- Frame
- Four M2 holes on a 9 × 9 mm pattern. (Foxeer 3850KV spec sheet, Foxeer 4533KV spec sheet)
Where to buy
- GetFPV3850KV or 4533KV; out of stock$19.49seen Oct 19, 2026Visit
- Pyrodrone3850KV; out of stock$19.99seen Oct 19, 2026Visit
- RaceDayQuads3850KV; out of stock$17.99seen Oct 19, 2026Visit
- WREKD3850KV; out of stock$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 | 3,850 rpm/V (also 4533KV) | Foxeer product page (archived), Foxeer 3850KV spec sheet |
| Stator | 14 × 4 mm (1404) | Foxeer 3850KV spec sheet, Foxeer 4533KV spec sheet |
| Configuration | 9N12P (9 stator slots, 12 magnet poles) | Foxeer 3850KV spec sheet, Foxeer 4533KV spec sheet |
| Battery | 3S–4S LiPo for 3850KV (4533KV: 2S–3S) | Foxeer 3850KV spec sheet |
| Weight | 9 g (with 3 cm of wire; the same for both KVs) | Foxeer 3850KV spec sheet, Foxeer 4533KV spec sheet |
| Dimensions | Φ19.2 × 16.9 mm; 13.1 mm without the shaft | Foxeer 3850KV spec sheet, Foxeer 4533KV spec sheet |
| Shaft | 1.5 mm, 2 mm inside the motor; stands 3.8 mm above the bell | Foxeer 3850KV spec sheet, Foxeer 4533KV spec sheet |
| Mounting | 4 × M2 on 9 × 9 mm | Foxeer 3850KV spec sheet, Foxeer 4533KV spec sheet |
| Magnets | N52H | Foxeer feature image 2 |
| Winding | Single-wrap winding of single-crystal oxygen-free copper; 260 °C high-temperature wire | Foxeer feature image |
| Internal resistance | 240 mΩ (4533KV 140 mΩ) | Foxeer 3850KV spec sheet |
| Idle current | 0.6 A (at 10 V; 4533KV 0.85 A) | Foxeer 3850KV spec sheet |
| Peak current | 15.3 A (Foxeer's max current, labelled '3S'; it equals the full-throttle draw on the DAL T3028 at 14.8 V. 4533KV 14.8 A, its DAL T3028 figure at 11.1 V) | Foxeer 3850KV spec sheet |
| Max power | 226 W (Foxeer's max continuous power, labelled '3S'; it equals the full-throttle figure on the DAL T3028 at 14.8 V. 4533KV 164 W, its DAL T3028 figure at 11.1 V) | Foxeer 3850KV spec sheet |
Bench data
Redrawn from Foxeer’s test reports. Thrust is static pull on a bench, more than you get in flight. Power is volts × amps; efficiency is thrust divided by power.
3850KV on 3S–4S6 props
| Prop | Throttle | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| DAL T3028at 14.8 V | 50% | 2.9 | 150 | 42.9 | 3.495 |
| 100% | 15.3 | 423 | 226.4 | 1.868 | |
| GF 3028×3at 14.8 V | 50% | 2.8 | 150 | 41.4 | 3.62 |
| 100% | 13.3 | 411 | 196.8 | 2.088 | |
| GF4×2×2at 11.1 V | 50% | 1.7 | 151 | 18.9 | 8.002 |
| 100% | 7.6 | 361 | 84.4 | 4.279 | |
| DAL T3028at 11.1 V | 50% | 1.8 | 93 | 20 | 4.655 |
| 100% | 9.5 | 272 | 105.5 | 2.579 | |
| GF 3028×3at 11.1 V | 50% | 1.4 | 90 | 15.5 | 5.792 |
| 100% | 8.2 | 263 | 91 | 2.889 | |
| DAL T3018at 11.1 V | 50% | 1.4 | 73 | 15.5 | 4.698 |
| 100% | 7.7 | 227 | 85.5 | 2.656 |
Source: Foxeer 3850KV spec sheet
4533KV on 2S–3S7 props
| Prop | Throttle | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| DAL T3028at 11.1 V | 50% | 2.9 | 125 | 32.2 | 3.883 |
| 100% | 14.8 | 350 | 164.3 | 2.131 | |
| GF 3028×3at 11.1 V | 50% | 2.9 | 124 | 32.2 | 3.852 |
| 100% | 13.2 | 342 | 146.5 | 2.334 | |
| DAL T3018at 11.1 V | 50% | 2.6 | 105 | 28.9 | 3.638 |
| 100% | 12.5 | 305 | 138.8 | 2.198 | |
| GF4×2×2at 7.4 V | 50% | 1.8 | 119 | 13.3 | 8.934 |
| 100% | 8.1 | 305 | 59.9 | 5.088 | |
| DAL T3028at 7.4 V | 50% | 1.4 | 68 | 10.4 | 6.564 |
| 100% | 8.2 | 191 | 60.7 | 3.148 | |
| GF 3028×3at 7.4 V | 50% | 1.3 | 62 | 9.6 | 6.445 |
| 100% | 7 | 184 | 51.8 | 3.552 | |
| DAL T3018at 7.4 V | 50% | 0.9 | 51 | 6.7 | 7.658 |
| 100% | 6.5 | 159 | 48.1 | 3.306 |
Source: Foxeer 4533KV spec sheet
Inside the motor
A brushless outrunner: the coils stand still in the middle and the magnets spin around them. From the top down:
- Shaft. 1.5 mm where the prop goes, 2 mm inside the motor. (Foxeer 3850KV spec sheet, Foxeer 4533KV spec sheet)
- Damping. Foxeer fits an aluminium sheet and a rubber ring, which it says absorb shocks. (Foxeer feature image 2)
- Stator. 9N12P, 14 × 4 mm, with a single-wrap winding of single-crystal oxygen-free copper in 260 °C wire. (Foxeer feature image, Foxeer 3850KV spec sheet)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 3850KV 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 | 56,980 | 5,698 Hz | 34,188 |
| 4S full | 16.8 | 64,680 | 6,468 Hz | 38,808 |
| 6S nominal | 22.2 | 85,470 | 8,547 Hz | 51,282 |
| 6S full | 25.2 | 97,020 | 9,702 Hz | 58,212 |
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 Foxeer’s published sizes: the 14 × 4 mm stator, 19.2 mm bell, 13.1 mm height, 1.5 mm shaft, 9 mm mounting circle and 9 teeth and 12 magnets. Anything Foxeer 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
- Foxeer: Datura 1404 FPV Motor (product page on Foxeer's own site, Wayback Machine copy captured 2022-05-24; the address now shows Foxeer's home page). Retrieved Oct 19, 2026.
- Foxeer: Datura 1404 feature image (KVs, winding; on the product page). Retrieved Oct 19, 2026.
- Foxeer: Datura feature image (damping, magnets; on the product page). Retrieved Oct 19, 2026.
- Foxeer: Datura 1404-3850KV technical data, drawing and bench data at 11.1 V and 14.8 V on four props (image on the product page). Foxeer's motor temperature after 3 s at full throttle is left out, as it has no figure at 50%; its DAL T3018 table at 14.8 V is left out (see the notes).. Retrieved Oct 19, 2026.
- Foxeer: Datura 1404-4533KV technical data, drawing and bench data at 7.4 V and 11.1 V on four props (image on the product page). Foxeer's motor temperature after 3 s at full throttle is left out, as it has no figure at 50%; its GF4×2×2 table at 11.1 V is left out (see the notes).. Retrieved Oct 19, 2026.
- Foxeer: Datura 1404 main product photo, used for finish. Retrieved Oct 19, 2026.