3 to 3.5-inch FPV motor
GEPRC SPEEDX2 1804
A 13.2 g motor for 3-inch whoops and 3 to 4-inch toothpicks; on GEPRC’s bench the 3450KV pulls up to 757 g per motor at 16 V and the 2450KV up to 799 g at 24 V.
- 3-inch whoops, 3 to 4-inch toothpicks and long range
- 4S (3450KV) or 6S (2450KV)
- Gemfan D76 and D90 duct props or 4-inch props
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 1804 motor drawn from GEPRC’s published sizes, not its exact design. Thrust, current and power are GEPRC’s bench figures for the GF 4023R*3 prop at 16 V, read straight across between its throttle steps. Its data starts at 50% throttle.
- Max thrust
- 757 g
- GF 4023R*3 prop, 16 V
- Weight
- 13.2 g
- with 13 cm of wire; the leads are 150 mm
- Peak current
- 25.3 A
- full throttle
- Max power
- 405 W
- full throttle
from $16.99a motor at GEPRC
A set of four: $67.96
Price seen Oct 19, 2026. Plain links: we earn nothing from them.
What it pulls
GEPRC’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 4023R*3: 354 g of thrust, 9.7 A, 155 W, 2.55 g per watt.
On your quad
4.7 : 1
Thrust to weight at full throttle: four motors pull 3,028 g with the GF 4023R*3 at 16 V.
At 60% throttle they pull 1,415 g, 2.2 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 for $16.99
13.2 g
GEPRC gives 13.2 g with 13 cm of wire, from a lightweight structure with large cut-outs that also help cooling.
Source: GEPRC product page
Shaped for pusher builds
GEPRC rounded the top of the bell so that large-pitch props mounted pusher-style do not touch the rotor and run out of balance.
Source: GEPRC product page
N52H arc magnets
Curved N52H magnets in a 7075-T6 aluminium rotor.
Damping O-ring
GEPRC fits a damping O-ring, which it says reduces vibration and lengthens bearing life.
Source: GEPRC features image
Up to 799 g on 6S
The 2450KV pulled 799 g at full throttle on a GF 4023R*3 at 24 V, drawing 18.8 A.
Source: GEPRC data table
What to pair it with
Our reading of GEPRC’s numbers, so your build matches what the motor was tested with.
- ESC
- GEPRC recommends a 20–45 A ESC. Its tables peak at 25.3 A (3450KV at 16 V) and 18.8 A (2450KV at 24 V). (GEPRC drawing and specs, GEPRC data table)
- Props
- GEPRC lists the HQProp T76MM and tested four Gemfan props: D76*5, D90*3, 4024R*2 and 4023R*3. The 4023R*3 gave the most thrust on both KVs. (GEPRC drawing and specs, GEPRC data table)
- Battery
- 4S for the 3450KV, 6S for the 2450KV. (GEPRC drawing and specs)
- Frame
- Four M2 holes on a 12 × 12 mm pattern. (GEPRC product page)
Where to buy
- GEPRCthe maker’s store; either KV, black or black and cyan$16.99seen Oct 19, 2026Visit
- GetFPV2450KV or 3450KVprice 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 | 3,450 rpm/V (also 2450KV) | GEPRC product page |
| Stator | 18 × 4 mm (1804) | GEPRC product page |
| Configuration | 12N14P (12 stator slots, 14 magnet poles) | GEPRC product page, GEPRC drawing and specs |
| Battery | 2S–4S LiPo (3450KV); 4S–6S (2450KV) (GEPRC’s spec image pairs the 3450KV with 4S and the 2450KV with 6S) | GEPRC product page, GEPRC drawing and specs |
| Weight | 13.2 g (with 13 cm of wire; the leads are 150 mm) | GEPRC product page, GEPRC drawing and specs |
| Dimensions | φ22.74 × 13.2 mm without the shaft; 17 mm with the 3.8 mm of shaft above the bell | GEPRC product page, GEPRC drawing and specs |
| Shaft | 1.5 mm (2 mm inside the motor), standing 3.8 mm above the bell; four M2 holes in the bell’s top, 5 mm apart | GEPRC product page, GEPRC drawing and specs |
| Mounting | 4 × M2 holes on a 12 mm circle (12 × 12 mm) | GEPRC product page, GEPRC drawing and specs |
| Bell | 7075-T6 aluminium | GEPRC drawing and specs |
| Magnets | N52H arc magnets | GEPRC product page, GEPRC drawing and specs |
| Bearings | 684ZZ, Japan ISC (custom) (as GEPRC’s spec image gives it) | GEPRC drawing and specs |
| Winding | Enamelled copper wire rated for 260 °C | GEPRC drawing and specs |
| Max current | 25.3 A (GEPRC labels it 5S, but it is the GF 4023R*3’s full-throttle current at 16 V; 18.8 A for the 2450KV (GF 4023R*3 at 24 V). GEPRC’s spec image gives 23 A for both) | GEPRC product page, GEPRC data table, GEPRC drawing and specs |
| Max continuous power | 404.8 W (GEPRC labels it 3S; it is the GF 4023R*3 row at 16 V. 452.2 W for the 2450KV, whose highest bench row is 451.2 W (GF 4023R*3 at 24 V)) | GEPRC product page, GEPRC data table |
| Leads | 24 AWG, 150 mm | GEPRC product page, GEPRC drawing and specs |
| In the box | 5 × M2×6 mm and 5 × M2×8 mm screws | GEPRC product page |
Bench data
Redrawn from GEPRC’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.
2450KV on 6S8 props
| Prop | Throttle | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| GF 4023R*3at 24 Vmotor at 82 °C | 50% | 4.1 | 266 | 98.4 | 2.703 |
| 100% | 18.8 | 799 | 451.2 | 1.771 | |
| GF 4024R*2at 25 Vmotor at 75 °C | 50% | 2.8 | 269 | 70 | 3.843 |
| 100% | 14.6 | 789 | 365 | 2.162 | |
| GF D90*3at 24 Vmotor at 80 °C | 50% | 6.9 | 273 | 165.6 | 1.649 |
| 100% | 17.5 | 716 | 420 | 1.705 | |
| GF D76*5at 24 Vmotor at 76 °C | 50% | 6.2 | 214 | 148.8 | 1.438 |
| 100% | 15.9 | 596 | 381.6 | 1.562 | |
| GF 4023R*3at 16 Vmotor at 63 °C | 50% | 2.7 | 158 | 43.2 | 3.657 |
| 100% | 11.7 | 481 | 187.2 | 2.569 | |
| GF D90*3at 16 Vmotor at 66 °C | 50% | 3.4 | 183 | 54.4 | 3.364 |
| 100% | 13.2 | 467 | 211.2 | 2.211 | |
| GF 4024R*2at 16 Vmotor at 60 °C | 50% | 1.9 | 143 | 30.4 | 4.704 |
| 100% | 9.6 | 453 | 153.6 | 2.949 | |
| GF D76*5at 16 Vmotor at 65 °C | 50% | 3.1 | 139 | 49.6 | 2.802 |
| 100% | 13.1 | 393 | 209.6 | 1.875 |
Source: GEPRC data table
3450KV on 4S8 props
| Prop | Throttle | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| GF 4023R*3at 16 Vmotor at 83 °C | 50% | 5.8 | 253 | 92.8 | 2.726 |
| 100% | 25.3 | 757 | 404.8 | 1.87 | |
| GF 4024R*2at 16 Vmotor at 76 °C | 50% | 4 | 256 | 64 | 4 |
| 100% | 20.3 | 748 | 324.8 | 2.303 | |
| GF D90*3at 16 Vmotor at 81 °C | 50% | 9.6 | 258 | 153.6 | 1.68 |
| 100% | 24 | 675 | 384 | 1.758 | |
| GF D76*5at 16 Vmotor at 77 °C | 50% | 8.8 | 203 | 140.8 | 1.442 |
| 100% | 23.1 | 563 | 369.6 | 1.523 | |
| GF 4023R*3at 12 Vmotor at 64 °C | 50% | 3.8 | 169 | 45.6 | 3.706 |
| 100% | 15.7 | 519 | 188.4 | 2.755 | |
| GF D90*3at 12 Vmotor at 67 °C | 50% | 4.8 | 196 | 57.6 | 3.403 |
| 100% | 17.6 | 499 | 211.2 | 2.363 | |
| GF 4024R*2at 12 Vmotor at 61 °C | 50% | 2.7 | 154 | 32.4 | 4.753 |
| 100% | 13 | 488 | 156 | 3.128 | |
| GF D76*5at 12 Vmotor at 66 °C | 50% | 4.3 | 149 | 51.6 | 2.888 |
| 100% | 17.5 | 420 | 210.1 | 2 |
Source: GEPRC data table
Inside the motor
A brushless outrunner: the coils stand still in the middle and the magnets spin around them. From the top down:
- Bell. 7075-T6 aluminium rotor with N52H arc magnets. (GEPRC drawing and specs)
- Stator. D21 silicon steel core, wound with enamelled wire rated for 260 °C. (GEPRC drawing and specs)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 3450KV 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 | 51,060 | 5,957 Hz | 35,742 |
| 4S full | 16.8 | 57,960 | 6,762 Hz | 40,572 |
| 6S nominal | 22.2 | 76,590 | 8,936 Hz | 53,613 |
| 6S full | 25.2 | 86,940 | 10,143 Hz | 60,858 |
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 GEPRC’s published sizes: the 18 × 4 mm stator, 22.74 mm bell, 13.2 mm height, 1.5 mm shaft, 12 mm mounting circle and 12 teeth and 14 magnets. Anything GEPRC 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
- GEPRC: SPEEDX2 1804 2450KV/3450KV Motor (product page, with the spec list for each KV). Retrieved Oct 19, 2026.
- GEPRC: SPEEDX2 1804 product drawing and specifications (image on the product page). Retrieved Oct 19, 2026.
- GEPRC: SPEEDX2 1804 motor data table, 2450KV at 16 V and 24–25 V and 3450KV at 12 V and 16 V on four Gemfan props (image on the product page). Temperatures are after 5 s at full throttle. The colour infographic on the same page gives the D76*5 full-throttle rows (596 g at 24 V, 563 g at 16 V) as “HQProp T76mm x3”.. Retrieved Oct 19, 2026.
- GEPRC: SPEEDX2 1804 features (image on the product page: N52H arc magnets, stator, damping O-ring). Retrieved Oct 19, 2026.
- GEPRC: SPEEDX2 1804 product photo, black and cyan (first gallery image). Retrieved Oct 19, 2026.
- GEPRC: SPEEDX2 1804 photos from the side and of the all-black version (image on the product page). Retrieved Oct 19, 2026.
