2.5 to 4-inch FPV motor
HGLRC SPECTER 1404
A 10 g 1404 for 2.5 to 4-inch props in three windings: the 2750KV pulled up to 405 g on HGLRC’s 22.2 V bench, the 5500KV up to 475 g at 14.8 V.
- 2-inch cinewhoops and 4-inch toothpicks
- 4S–6S (2750KV), 3S–4S (4800KV) or 2S–4S (5500KV)
- 2.5 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 1404 motor drawn from HGLRC’s published sizes, not its exact design. Thrust, current and power are HGLRC’s bench figures for the HQ 3*3*3 prop at 22.2 V, read straight across between its throttle steps. Its data starts at 50% throttle.
- Max thrust
- 405 g
- HQ 3*3*3 prop, 22.2 V
- Weight
- 10 g
- with leads; 4800KV 10 g, 5500KV 9.6 g
- Peak current
- 6.9 A
- full throttle
- Max power
- 153 W
- full throttle
from $13.99a motor at HGLRC
A set of four: $55.96
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 HQ 3*3*3: 210 g of thrust, 2.5 A, 56 W, 4.53 g per watt.
On your quad
2.5 : 1
Thrust to weight at full throttle: four motors pull 1,620 g with the HQ 3*3*3 at 22.2 V.
At 60% throttle they pull 839 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 for $13.99
405 g on 6S
The 2750KV pulled 405 g at full throttle on an HQ 3×3×3 at 22.2 V, drawing 6.9 A.
Source: HGLRC spec sheet and tables
475 g on 4S
The 5500KV pulled 475 g at full throttle on an HQ 3×2.5×3 at 14.8 V, drawing 15.8 A.
Source: HGLRC spec sheet and tables
N52H arc magnets
Customised N52H arc magnets, which HGLRC says give strong magnetism and high torque.
Source: HGLRC product page
One-piece 7075 bell
The rotor is one piece of 7075 aluminium, anodised in two colours.
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 an ESC over 15 A for the 2750KV. Its tables peak at 6.9 A (2750KV, 22.2 V), 15.1 A (4800KV, 14.8 V) and 15.8 A (5500KV, 14.8 V), so the 4800KV and 5500KV want 20 A or more. (HGLRC product page, HGLRC spec sheet and tables)
- Props
- 2.5 to 4-inch. HGLRC tested on HQ 3×2.5×3, HQ 3×3×3 and Gemfan 4×2×2 props, and the 5500KV also on a GF2.5×4×3; at 14.8 V the 4-inch prop pulled most on the 2750KV (351 g). (HGLRC spec sheet and tables)
- Battery
- 4S–6S for the 2750KV, 3S–4S for the 4800KV, 2S–4S for the 5500KV. (HGLRC spec sheet and tables)
- Frame
- Four M2 holes on a 9 × 9 mm pattern. The bell also has four M2 holes on a 5 mm circle for bolt-on props. (HGLRC spec sheet and tables)
Where to buy
- HGLRCthe maker’s store; 2750KV, 4800KV or 5500KV, same price$13.99seen Oct 19, 2026Visit
Plain links, not affiliate links. Prices change; the store’s page has the current one.
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 2,750 rpm/V (also 4800KV and 5500KV) | HGLRC product page, HGLRC spec sheet and tables |
| Stator | 14 × 4 mm (1404) (from the size in HGLRC’s name) | HGLRC spec sheet and tables |
| Configuration | 9N12P (9 stator slots, 12 magnet poles) | HGLRC product page, HGLRC spec sheet and tables |
| Battery | 4S–6S LiPo (2750KV); 3S–4S (4800KV); 2S–4S (5500KV) | HGLRC spec sheet and tables |
| Weight | 10 g (with leads; 4800KV 10 g, 5500KV 9.6 g) | HGLRC product page, HGLRC spec sheet and tables |
| Dimensions | φ19.13 × 12.25 mm, with 3.8 mm of shaft above the bell | 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 9 mm circle (9 × 9 mm) | HGLRC product page, 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 sheet and tables |
| Bearings | ISC (as HGLRC gives it) | HGLRC spec sheet and tables |
| Winding | 200° high-temperature copper wire on a Kawasaki 1200 silicon-steel stator | HGLRC product page, HGLRC spec sheet and tables |
| Max current | 6.9 A (4800KV 15.4 A, 5500KV 15.8 A; HGLRC’s page text calls it the maximum continuous current) | HGLRC product page, HGLRC spec sheet and tables |
| Max power | 155 W (4800KV 223 W, 5500KV 234 W) | HGLRC product page, HGLRC spec sheet and tables |
| Leads | 150 mm (2750KV, 4800KV); 100 mm (5500KV) | HGLRC spec sheet and tables |
| In the box | 5 × M2×5 mm and 2 × M2×7 mm screws (2750KV, 4800KV); 5 × M2×6 mm and 2 × M2×8 mm screws (5500KV) (the page text lists 5 × M2×6 mm and 2 × M2×7 mm for all three) | 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.
2750KV on 4S–6S5 props
| Prop | Throttle | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| HQ 3*3*3at 22.2 Vmotor at 79 °C | 50% | 1.45 | 161 | 32.2 | 5.002 |
| 100% | 6.9 | 405 | 153.2 | 2.644 | |
| HQ 3*2.5*3at 22.2 Vmotor at 76 °C | 50% | 1.2 | 140 | 26.6 | 5.255 |
| 100% | 6.3 | 389 | 139.9 | 2.781 | |
| GF4*2*2at 14.8 Vmotor at 66 °C | 50% | 0.85 | 128 | 12.6 | 10.175 |
| 100% | 5 | 351 | 74 | 4.743 | |
| HQ 3*3*3at 14.8 Vmotor at 63 °C | 50% | 0.75 | 106 | 11.1 | 9.55 |
| 100% | 4.3 | 279 | 63.6 | 4.384 | |
| HQ 3*2.5*3at 14.8 Vmotor at 61 °C | 50% | 0.8 | 89 | 11.8 | 7.517 |
| 100% | 4 | 259 | 59.2 | 4.375 |
Source: HGLRC spec sheet and tables
4800KV on 3S–4S5 props
| Prop | Throttle | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| HQ 3*3*3at 14.8 Vmotor at 85 °C | 50% | 3.6 | 178 | 53.3 | 3.341 |
| 100% | 15.1 | 458 | 223.5 | 2.049 | |
| HQ 3*2.5*3at 14.8 Vmotor at 80 °C | 50% | 2.7 | 140 | 40 | 3.504 |
| 100% | 14.1 | 432 | 208.7 | 2.07 | |
| GF4*2*2at 11.1 Vmotor at 80 °C | 50% | 4.5 | 121 | 50 | 2.422 |
| 100% | 13.1 | 293 | 145.4 | 2.015 | |
| HQ 3*3*3at 11.1 Vmotor at 78 °C | 50% | 3.3 | 89 | 36.6 | 2.43 |
| 100% | 11.8 | 229 | 131 | 1.748 | |
| HQ 3*2.5*3at 11.1 Vmotor at 77 °C | 50% | 2.9 | 70 | 32.2 | 2.175 |
| 100% | 11.4 | 216 | 126.5 | 1.707 |
Source: HGLRC spec sheet and tables
5500KV on 2S–4S6 props
| Prop | Throttle | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| HQ 3*2.5*3at 14.8 Vmotor at 84 °C | 50% | 3 | 154 | 44.4 | 3.468 |
| 100% | 15.8 | 475 | 233.8 | 2.031 | |
| GF4*2*2at 11.1 Vmotor at 82 °C | 50% | 5 | 133 | 55.5 | 2.396 |
| 100% | 14.7 | 322 | 163.2 | 1.973 | |
| GF2.5*4*3at 14.8 Vmotor at 68 °C | 50% | 1.9 | 108 | 28.1 | 3.841 |
| 100% | 8.8 | 317 | 130.2 | 2.434 | |
| HQ 3*3*3at 11.1 Vmotor at 80 °C | 50% | 3.7 | 98 | 41.1 | 2.386 |
| 100% | 13.2 | 252 | 146.5 | 1.72 | |
| HQ 3*2.5*3at 11.1 Vmotor at 79 °C | 50% | 3.2 | 77 | 35.5 | 2.168 |
| 100% | 12.8 | 238 | 142.1 | 1.675 | |
| GF2.5*4*3at 11.1 Vmotor at 63 °C | 50% | 1.7 | 54 | 18.9 | 2.862 |
| 100% | 8.2 | 159 | 91 | 1.747 |
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 sheet and tables)
- Stator. 9N12P on Kawasaki silicon-steel laminations, which HGLRC says cut heat and losses, wound with 200° high-temperature copper wire. (HGLRC product page, HGLRC spec sheet and tables)
- Shaft and bearings. Alloy-steel shaft on ISC bearings. (HGLRC product page, HGLRC spec sheet and tables)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 2750KV 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 | 40,700 | 4,070 Hz | 24,420 |
| 4S full | 16.8 | 46,200 | 4,620 Hz | 27,720 |
| 6S nominal | 22.2 | 61,050 | 6,105 Hz | 36,630 |
| 6S full | 25.2 | 69,300 | 6,930 Hz | 41,580 |
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 HGLRC’s published sizes: the 14 × 4 mm stator, 19.13 mm bell, 12.25 mm height, 1.5 mm shaft, 9 mm mounting circle and 9 teeth and 12 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 1404 2750KV/4800KV/5500KV 4-6S Brushless Motor (product page, with features, specs for the 2750KV and 5500KV, packing list and price). Retrieved Oct 19, 2026.
- HGLRC: SPECTER 1404 long description image on the product page: spec list for each KV, drawing, efficacy tables (50% and 100% throttle per prop and voltage, with one motor temperature per table after 5 s at full throttle) and packing list for each KV. Retrieved Oct 19, 2026.
- HGLRC: SPECTER 1404 main product photo (first gallery image). Retrieved Oct 19, 2026.
- HGLRC: SPECTER 1404 2750KV side view with its screws (gallery image). Retrieved Oct 19, 2026.
- HGLRC: SPECTER 1404 4800KV from above (gallery image). Retrieved Oct 19, 2026.
