3- to 5-inch FPV motor
Foxeer Datura 2105.5
A 21 × 5.5 mm, 21 g motor for 3- to 5-inch quads, 1650KV for 4S–6S or 2950KV for 3S–4S, that pulled 1,007 g (1650KV, 22.2 V) and 1,211 g (2950KV, 14.8 V) at full throttle on Foxeer's bench.
- 3- to 5-inch quads
- 6S (1650KV) or 4S (2950KV)
- 12 × 12 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 2105.5 motor drawn from Foxeer’s published sizes, not its exact design. Thrust, current and power are Foxeer’s bench figures for the GF 5125 prop at 22.2 V, read straight across between its throttle steps. Its data starts at 50% throttle.
- Max thrust
- 1,007 g
- GF 5125 prop, 22.2 V
- Weight
- 21 g
- with 3 cm of wire; the same for both KVs
- Peak current
- 16.6 A
- full throttle
- Max power
- 369 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 GF 5125: 453 g of thrust, 5.9 A, 131 W, 4.09 g per watt.
On your quad
6.2 : 1
Thrust to weight at full throttle: four motors pull 4,028 g with the GF 5125 at 22.2 V.
At 60% throttle they pull 1,814 g, 2.8 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 1 kg of pull
At full throttle the 1650KV pulled 1,007 g on a GF 5125 at 22.2 V (16.6 A), and the 2950KV 1,211 g on a GF5125R at 14.8 V (37.9 A), on Foxeer's bench.
M3/M5 prop shaft
A 3 mm shaft with an M3 prop thread, which Foxeer pairs with a custom aluminium sheath and sells as an M3/M5 prop shaft.
21 g
Foxeer weighs both KVs at 21 g with 3 cm of wire.
N52H magnets, 260 °C windings
N52H magnets, and single-wrap windings of single-crystal oxygen-free copper in wire Foxeer rates for 260 °C.
Source: Foxeer feature image 2
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 18.6 A for the 1650KV (22.2 V) and 37.9 A for the 2950KV (14.8 V), the highest draws on its bench. A 25 A ESC covers the 1650KV; the 2950KV wants 40 A or more. (Foxeer 1650KV spec sheet, Foxeer 2950KV spec sheet)
- Props
- Foxeer benched the 1650KV on six props, from the GF D76×5 to the DAL 5139.5, and pulled the most on the GF 5125 (1,007 g at 22.2 V). The 2950KV pulled the most on the GF5125R (1,211 g at 14.8 V) and the HQT5×3R (1,169 g). (Foxeer 1650KV spec sheet, Foxeer 2950KV spec sheet)
- Battery
- 4S–6S for the 1650KV, tested at 14.8 V and 22.2 V; 3S–4S for the 2950KV, tested at 11.1 V and 14.8 V. (Foxeer 1650KV spec sheet, Foxeer 2950KV spec sheet)
- Frame
- Four M2 holes on a 12 × 12 mm pattern. (Foxeer 1650KV spec sheet, Foxeer 2950KV spec sheet)
Where to buy
- GetFPVM3/M5 shaft versionprice 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 | 1,650 rpm/V (also 2950KV) | Foxeer product page (archived), Foxeer 1650KV spec sheet |
| Stator | 21 × 5.5 mm (2105.5) | Foxeer 1650KV spec sheet, Foxeer 2950KV spec sheet |
| Configuration | 12N14P (12 stator slots, 14 magnet poles) | Foxeer 1650KV spec sheet, Foxeer 2950KV spec sheet |
| Battery | 4S–6S LiPo for 1650KV (2950KV: 3S–4S) | Foxeer 1650KV spec sheet |
| Weight | 21 g (with 3 cm of wire; the same for both KVs) | Foxeer 1650KV spec sheet, Foxeer 2950KV spec sheet |
| Dimensions | Φ25.53 × 26.4 mm; 15.1 mm without the shaft | Foxeer 1650KV spec sheet, Foxeer 2950KV spec sheet |
| Shaft | 3 mm, with an M3 prop thread standing 11.3 mm above the bell; Foxeer pairs it with a custom aluminium sheath and sells it as an M3/M5 prop shaft | Foxeer feature image, Foxeer 1650KV spec sheet |
| Mounting | 4 × M2 on 12 × 12 mm | Foxeer 1650KV spec sheet, Foxeer 2950KV 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 2 |
| Internal resistance | 190 mΩ (2950KV 60 mΩ) | Foxeer 1650KV spec sheet |
| Idle current | 0.6 A (at 10 V; 2950KV 1.5 A) | Foxeer 1650KV spec sheet |
| Peak current | 18.6 A (Foxeer's max current, labelled '3S'; it equals the full-throttle draw on the DAL 5139.5 at 22.2 V. 2950KV 37.9 A, its GF5125R figure at 14.8 V) | Foxeer 1650KV spec sheet |
| Max power | 413 W (Foxeer's max continuous power, labelled '3S'; it equals the full-throttle figure on the DAL 5139.5 at 22.2 V. 2950KV 620 W) | Foxeer 1650KV 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.
1650KV on 4S–6S9 props
| Prop | Throttle | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| GF 5125at 22.2 V | 50% | 3.2 | 315 | 71 | 4.434 |
| 100% | 16.6 | 1,007 | 368.5 | 2.733 | |
| DAL 5139.5at 22.2 V | 50% | 3.5 | 335 | 77.7 | 4.311 |
| 100% | 18.6 | 953 | 412.9 | 2.308 | |
| DAL T5126at 22.2 V | 50% | 2.8 | 246 | 62.2 | 3.958 |
| 100% | 12.8 | 762 | 284.2 | 2.682 | |
| GF 5125at 14.8 V | 50% | 1.9 | 179 | 28.1 | 6.366 |
| 100% | 10.5 | 628 | 155.4 | 4.041 | |
| DAL 5139.5at 14.8 V | 50% | 1.9 | 184 | 28.1 | 6.543 |
| 100% | 12.2 | 618 | 180.6 | 3.423 | |
| GF D90×3at 22.2 V | 50% | 2.6 | 211 | 57.7 | 3.656 |
| 100% | 11.5 | 610 | 255.3 | 2.389 | |
| HQ 76×8at 22.2 V | 50% | 2.6 | 168 | 57.7 | 2.911 |
| 100% | 12.8 | 527 | 284.2 | 1.855 | |
| GF D76×5at 22.2 V | 50% | 2.3 | 167 | 51.1 | 3.271 |
| 100% | 10.8 | 493 | 239.8 | 2.056 | |
| DAL T5126at 14.8 V | 50% | 0.9 | 112 | 13.3 | 8.408 |
| 100% | 6.5 | 370 | 96.2 | 3.846 |
Source: Foxeer 1650KV spec sheet
2950KV on 3S–4S10 props
| Prop | Throttle | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| GF5125Rat 14.8 V | 50% | 8.2 | 453 | 121.4 | 3.733 |
| 100% | 37.9 | 1,211 | 560.9 | 2.159 | |
| HQT5×3Rat 14.8 V | 50% | 7.1 | 438 | 105.1 | 4.168 |
| 100% | 33.4 | 1,169 | 494.3 | 2.365 | |
| GF D76×5at 22.2 V | 50% | 7.8 | 411 | 173.2 | 2.374 |
| 100% | 30.1 | 1,078 | 668.2 | 1.613 | |
| GF D76at 22.2 V | 50% | 6.5 | 391 | 144.3 | 2.71 |
| 100% | 28.9 | 1,024 | 641.6 | 1.596 | |
| DAL T5126at 14.8 V | 50% | 6.8 | 341 | 100.6 | 3.388 |
| 100% | 30.2 | 958 | 447 | 2.143 | |
| GF4024Rat 14.8 V | 50% | 4.3 | 255 | 63.6 | 4.007 |
| 100% | 21.3 | 801 | 315.2 | 2.541 | |
| GF5125Rat 11.1 V | 50% | 4.8 | 256 | 53.3 | 4.805 |
| 100% | 24.7 | 788 | 274.2 | 2.874 | |
| HQT5×3Rat 11.1 V | 50% | 4.5 | 287 | 50 | 5.746 |
| 100% | 20.8 | 785 | 230.9 | 3.4 | |
| DAL T5126at 11.1 V | 50% | 4.2 | 198 | 46.6 | 4.247 |
| 100% | 19.4 | 606 | 215.3 | 2.814 | |
| GF4024Rat 11.1 V | 50% | 2.8 | 153 | 31.1 | 4.923 |
| 100% | 13.9 | 495 | 154.3 | 3.208 |
Source: Foxeer 2950KV 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. 3 mm with an M3 prop thread and a custom aluminium sheath; Foxeer calls it an M3/M5 prop shaft. (Foxeer feature image, Foxeer 1650KV spec sheet)
- Damping. Foxeer fits an aluminium sheet and a rubber ring, which it says absorb shocks. (Foxeer feature image 2)
- Stator. 12N14P, 21 × 5.5 mm, with a single-wrap winding of single-crystal oxygen-free copper in 260 °C wire. (Foxeer feature image 2, Foxeer 1650KV spec sheet)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 1650KV 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 | 24,420 | 2,849 Hz | 17,094 |
| 4S full | 16.8 | 27,720 | 3,234 Hz | 19,404 |
| 6S nominal | 22.2 | 36,630 | 4,274 Hz | 25,641 |
| 6S full | 25.2 | 41,580 | 4,851 Hz | 29,106 |
A 14-pole rotor has 7 pole pairs, so every turn of the shaft is 7 electrical cycles, and a six-step ESC switches the phases 42 times per turn.
About the 3D model
A generic outrunner drawn from Foxeer’s published sizes: the 21 × 5.5 mm stator, 25.53 mm bell, 15.1 mm height, 3 mm shaft, 12 mm mounting circle and 12 teeth and 14 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 2105.5 FPV Motor M3/M5 Prop Shaft (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 2105.5 feature image (KVs, aluminium sheath, M3/M5 prop shaft; on the product page). Retrieved Oct 19, 2026.
- Foxeer: Datura 2105.5 feature image (damping, magnets, winding; on the product page). Retrieved Oct 19, 2026.
- Foxeer: Datura 2105.5-1650KV technical data, drawing and bench data at 14.8 V and 22.2 V on six 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%.. Retrieved Oct 19, 2026.
- Foxeer: Datura 2105.5-2950KV technical data, drawing and bench data at 11.1 V, 14.8 V and 22.2 V on six 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%.. Retrieved Oct 19, 2026.
- Foxeer: Datura 2105.5 main product photo. Retrieved Oct 19, 2026.
- Foxeer: Datura 2105.5 product photo, front view (on the product page). Retrieved Oct 19, 2026.
- Foxeer: Datura 2105.5 T-Mount FPV Motor (Foxeer's separate page for the T-mount version, 2650KV and 3650KV; Wayback Machine copy captured 2022-12-01). Retrieved Oct 19, 2026.