3 to 4-inch FPV motor
HGLRC SPECTER 1804
A 13.3 g 1804 for 3 to 4-inch quads: on HGLRC’s 24 V bench the 2450KV pulled up to 815 g on a GF 4023R×3, drawing 18 A.
- 3 to 4-inch freestyle and cruising
- 6S or 4S (2450KV), 3S–4S (3500KV)
- 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 1804 motor drawn from HGLRC’s published sizes, not its exact design. Thrust, current and power are HGLRC’s bench figures for the GF 4023R*3 prop at 24 V, read straight across between its throttle steps. Its data starts at 50% throttle.
- Max thrust
- 815 g
- GF 4023R*3 prop, 24 V
- Weight
- 13.3 g
- with leads, both KVs; the page text gives ±0.3 g
- Peak current
- 18.0 A
- full throttle
- Max power
- 432 W
- full throttle
from $15.99a motor at HGLRC
A set of four: $63.96
Price seen Oct 19, 2026. Plain links: we earn nothing from them.
What it pulls
HGLRC’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: 380 g of thrust, 6.7 A, 161 W, 2.69 g per watt.
On your quad
5.0 : 1
Thrust to weight at full throttle: four motors pull 3,260 g with the GF 4023R*3 at 24 V.
At 60% throttle they pull 1,519 g, 2.3 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 for $15.99
815 g on 6S
The 2450KV pulled 815 g at full throttle on a GF 4023R×3 at 24 V, drawing 18 A.
Source: HGLRC spec sheet and tables
260° winding
HGLRC rates the copper winding for 260° and says it keeps the motor stable in continuous high-throttle flight.
N52H arc magnets
Customised N52H arc magnets, which HGLRC says give strong magnetism and high torque.
Source: HGLRC product page
What to pair it with
Our reading of HGLRC’s numbers, so your build matches what the motor was tested with.
- ESC
- HGLRC asks for a 25–35 A ESC. The 2450KV’s tables peak at 18 A (GF 4023R×3, 24 V); HGLRC’s spec image gives the 3500KV 24.5 A. (HGLRC product page, HGLRC spec image, HGLRC spec sheet and tables)
- Props
- 3 to 4-inch. HGLRC tested the 2450KV on HQ T76×3, HQ D90×3, GF 4024R×2 and GF 4023R×3; at 24 V the two 4-inch props pulled most (805 g and 815 g). (HGLRC spec image, HGLRC spec sheet and tables)
- Battery
- 4S–6S for the 2450KV, 3S–4S for the 3500KV. (HGLRC spec image)
- Frame
- Four M2 holes on a 12 × 12 mm pattern. The bell also has four M2 holes on a 5 mm circle for bolt-on props. (HGLRC spec image, HGLRC spec sheet and tables)
Where to buy
- HGLRCthe maker’s store; 2450KV or 3500KV, same price$15.99seen Oct 19, 2026Visit
Plain links, not affiliate links. Prices change; the store’s page has the current one.
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 2,450 rpm/V (also 3500KV) | HGLRC product page, HGLRC spec image |
| Stator | 18 × 4 mm (1804) (from the size in HGLRC’s name) | HGLRC product page |
| Configuration | 12N14P (12 stator slots, 14 magnet poles) | HGLRC product page, HGLRC spec image |
| Battery | 4S–6S LiPo (2450KV); 3S–4S (3500KV) | HGLRC spec image |
| Weight | 13.3 g (with leads, both KVs; the page text gives ±0.3 g) | HGLRC product page, HGLRC spec image |
| Dimensions | φ22.68 × 13.2 mm, with 3.8 mm of shaft above the bell | HGLRC spec image, HGLRC spec sheet and tables |
| Shaft | 1.5 mm alloy steel, standing 3.8 mm above the bell; four M2 holes on a 5 mm circle in the top of the bell | HGLRC product page, HGLRC spec sheet and tables |
| Mounting | 4 × M2 holes on a 12 mm circle (12 × 12 mm) | HGLRC spec image, HGLRC spec sheet and tables |
| Bell | One-piece 7075 aluminium rotor, anodised in two colours | HGLRC product page |
| Magnets | N52H arc magnets | HGLRC product page, HGLRC spec image |
| Bearings | ISC (as HGLRC gives it) | HGLRC spec image |
| Winding | 260° high-temperature copper wire on a Kawasaki 1200 silicon-steel stator (the page text’s feature list says 200°) | HGLRC spec image, HGLRC spec sheet and tables |
| Max current | 18 A (2450KV, as in the page text and HGLRC’s bench table; the spec image gives 14 A. 3500KV: 24.5 A in the spec image, 14 A (5 s) in the page text) | HGLRC product page, HGLRC spec sheet and tables |
| Max power | 432 W (2450KV; 3500KV 392 W in the spec image, 432 W in the page text) | HGLRC product page, HGLRC spec image |
| Leads | 26 AWG, 150 mm (2450KV); 24 AWG, 160 mm (3500KV) | HGLRC spec image |
| In the box | 5 × M2×6 mm and 2 × M2×7 mm screws | HGLRC spec sheet and tables |
Bench data
Redrawn from HGLRC’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 4S–6S8 props
| Prop | Throttle | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| GF 4023R*3at 24 Vmotor at 82 °C | 50% | 3.9 | 271 | 93.6 | 2.895 |
| 100% | 18 | 815 | 432 | 1.887 | |
| GF 4024R*2at 24 Vmotor at 75 °C | 50% | 2.7 | 274 | 67.5 | 4.059 |
| 100% | 13.9 | 805 | 347.5 | 2.317 | |
| HQ D90*3at 24 Vmotor at 80 °C | 50% | 6.6 | 278 | 158.4 | 1.755 |
| 100% | 16.6 | 730 | 398.4 | 1.832 | |
| HQ T76*3at 24 Vmotor at 76 °C | 50% | 4.3 | 268 | 103.2 | 2.597 |
| 100% | 17.6 | 709 | 422.4 | 1.679 | |
| GF 4023R*3at 16 Vmotor at 63 °C | 50% | 2.6 | 161 | 41.6 | 3.87 |
| 100% | 11.1 | 490 | 177.6 | 2.759 | |
| HQ D90*3at 16 Vmotor at 66 °C | 50% | 3.3 | 187 | 52.8 | 3.542 |
| 100% | 12.5 | 476 | 200 | 2.38 | |
| GF 4024R*2at 16 Vmotor at 60 °C | 50% | 1.8 | 146 | 28.8 | 5.069 |
| 100% | 9.1 | 462 | 145.6 | 3.173 | |
| HQ T76*3at 16 Vmotor at 65 °C | 50% | 2 | 139 | 32 | 4.344 |
| 100% | 10 | 403 | 160 | 2.519 |
Source: HGLRC spec sheet and tables
Inside the motor
A brushless outrunner: the coils stand still in the middle and the magnets spin around them. From the top down:
- Bell. One-piece 7075 aluminium rotor, anodised in two colours. (HGLRC product page)
- Magnets. Customised N52H arc magnets. (HGLRC product page, HGLRC spec image)
- Stator. 12N14P on Kawasaki 1200 silicon-steel laminations, wound with copper wire rated for 260°. (HGLRC product page, HGLRC spec image)
- Shaft and bearings. Alloy-steel shaft on ISC bearings. (HGLRC product page, HGLRC spec image)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 2450KV 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 | 36,260 | 4,230 Hz | 25,382 |
| 4S full | 16.8 | 41,160 | 4,802 Hz | 28,812 |
| 6S nominal | 22.2 | 54,390 | 6,346 Hz | 38,073 |
| 6S full | 25.2 | 61,740 | 7,203 Hz | 43,218 |
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 HGLRC’s published sizes: the 18 × 4 mm stator, 22.68 mm bell, 13.2 mm height, 1.5 mm shaft, 12 mm mounting circle and 12 teeth and 14 magnets. Anything HGLRC 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
- HGLRC: SPECTER 1804-2450/3500KV brushless motor (product page, with features, a spec list for each KV and price). Retrieved Oct 19, 2026.
- HGLRC: SPECTER 1804 motor specification for the 2450KV and 3500KV (gallery image on the product page). Retrieved Oct 19, 2026.
- HGLRC: SPECTER 1804 long description image on the product page: spec lists, drawing, efficacy tables for each KV (50% and 100% throttle per prop and voltage, with one motor temperature per table after 5 s at full throttle) and packing lists. Retrieved Oct 19, 2026.
- HGLRC: SPECTER 1804 main product photo (first gallery image), the red 2450KV. Retrieved Oct 19, 2026.
