3- to 5-inch light FPV motor
RCinPower GTS V3 2105 Plus
A 21 g 2105 for 3- to 4-inch toothpicks, ducted quads and ultralight 5-inch builds; on 4S the 2950KV pulled 805–1,236 g per motor at full throttle on 4- and 5-inch props.
- 3- to 4-inch toothpicks and ducted quads
- ultralight 5-inch long range
- 3S–4S (2950KV, 3600KV) or 5S–6S (1850KV)
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 2105 motor drawn from RCinPower’s published sizes, not its exact design. Thrust, current and power are RCinPower’s bench figures for the Gemfan 5125 prop at 16 V, read straight across between its throttle steps. Its data starts at 50% throttle.
- Max thrust
- 1,236 g
- Gemfan 5125 prop, 16 V
- Weight
- 21 g
- with 3 cm leads; 20 g for 1850KV and 3600KV, and RCinPower's scale photo shows 20.00 g
- Peak current
- 31.6 A
- full throttle
- Max power
- 506 W
- full throttle
from $20.99a motor at WREKD
A set of four: $83.96
Price seen Oct 19, 2026. Plain links: we earn nothing from them.
What it pulls
RCinPower’s own bench test, one line per prop. Drag across the chart to move the throttle; the model above follows.
At 60% with the Gemfan 5125: 610 g of thrust, 12.1 A, 193 W, 3.63 g per watt.
On your quad
7.6 : 1
Thrust to weight at full throttle: four motors pull 4,944 g with the Gemfan 5125 at 16 V.
At 60% throttle they pull 2,438 g, 3.8 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 for $20.99
For light 3- to 5-inch builds
RCinPower says the 2105 Plus suits ultralight 5-inch long-range quads and 3- to 4-inch toothpicks and ducted quads, and calls it light with high torque.
Source: RCinPower page image
20 g
20 g with 3 cm leads (21 g for the 2950KV); RCinPower's scale photo shows 20.00 g.
Source: RCinPower page image
Bench data from ducted to 6-inch props
Gemfan D76 and D90 ducted props, 4-, 5- and 6-inch props, mostly at two voltages per KV, with the temperature after 3 s at full throttle.
Source: RCinPower page image
Most efficient at low current
RCinPower gives over 85% efficiency at 1–3 A for the 1850KV, 2–4 A for the 2950KV and 3–6 A for the 3600KV.
Source: RCinPower page image
What to pair it with
Our reading of RCinPower’s numbers, so your build matches what the motor was tested with.
- ESC
- On 4S at full throttle the 2950KV drew 19.5–31.6 A on 4- and 5-inch props and the 3600KV 35–36.4 A; on 6S the 1850KV drew no more than 16.5 A. RCinPower rates the 2950KV at 38.8 A and the 3600KV at 36.4 A. An ESC rated for at least 40 A per motor covers the 2950KV and 3600KV on 4S. (RCinPower page image)
- Props
- On the 2950KV at 16 V the 4-inch Gemfan 4024 ran coolest (58 °C) and the 5-inch props pulled 1,176–1,236 g at full throttle. RCinPower marks the 3600KV on the Gemfan D90 ducted prop at 16 V hot (83 °C). (RCinPower page image)
- Battery
- 3S–4S for the 2950KV and 3600KV; 5S–6S for the 1850KV. (RCinPower page image)
- Frame
- Four M2 screws, opposite holes 12 mm apart. (RCinPower page image)
Where to buy
- WREKD1850KV, 2950KV or 3600KV; gunmetal and gold or teal and pink (the page opens on the 1850KV)$20.99seen Oct 19, 2026Visit
- RaceDayQuads2950KV, choose colour$25.49seen Oct 19, 2026Visit
- Pyrodrone2950KV, gunmetal and gold$28.99seen Oct 19, 2026Visit
Plain links, not affiliate links. Prices change; the store’s page has the current one.
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 2,950 rpm/V (also 1850KV and 3600KV) | RCinPower page image |
| Stator | 21 × 5.5 mm (RCinPower names the motor 2105; its spec tables give a 5.5 mm stator height) | RCinPower page image |
| Configuration | 12N14P (12 stator slots, 14 magnet poles) | RCinPower page image |
| Battery | 3S–4S LiPo (2950KV, 3600KV); 5S–6S for the 1850KV | RCinPower page image |
| Weight | 21 g (with 3 cm leads; 20 g for 1850KV and 3600KV, and RCinPower's scale photo shows 20.00 g) | RCinPower page image |
| Dimensions | φ25.53 × 15.2 mm (without the shaft) (the 3600KV's table gives 15.4 mm; all three drawings give 15.20) | RCinPower page image |
| Shaft | 3 mm inside, M5 thread outside; the thread stands 11.5 mm above the bell | RCinPower page image |
| Mounting | 4 × M2 holes, opposite holes 12 mm apart (12 × 12) | RCinPower page image |
| Internal resistance | 60 mΩ (160 mΩ for 1850KV, 45 mΩ for 3600KV) | RCinPower page image |
| No-load current | 1.5 A (at 10 V; 0.55 A for 1850KV, 1.9 A for 3600KV) | RCinPower page image |
| Max current | 38.8 A (RCinPower labels it 3S; the 2950KV sheet's last bench row (Gemfan 6026 at 16 V, full throttle) is cut off in RCinPower's image. 16.5 A for 1850KV and 36.4 A for 3600KV, each the same as its highest bench reading) | RCinPower page image |
| Max continuous power | 620 W (RCinPower labels it 3S; 396 W for 1850KV and 582 W for 3600KV, each matching its highest bench reading) | RCinPower page image |
Bench data
Redrawn from RCinPower’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.
1850KV on 5S–6S8 props
| Prop | Throttle | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| Gemfan 6026 (GF6026)at 24 Vmotor at 75 °C | 50% | 3.3 | 422 | 79.2 | 5.328 |
| 100% | 16.5 | 1,174 | 396 | 2.965 | |
| Gemfan 5130 (GF5130R)at 24 Vmotor at 70 °C | 50% | 3 | 358 | 72 | 4.972 |
| 100% | 14.9 | 973 | 357.6 | 2.721 | |
| Gemfan 6026 (GF6026)at 21 Vmotor at 69 °C | 50% | 2.5 | 338 | 52.5 | 6.438 |
| 100% | 13.9 | 944 | 291.9 | 3.234 | |
| Gemfan 5125 (GF5125R)at 24 Vmotor at 69 °C | 50% | 2.5 | 307 | 60 | 5.117 |
| 100% | 13 | 933 | 312 | 2.99 | |
| HQProp T5 × 3 (HQT5*3R)at 24 Vmotor at 68 °C | 50% | 2.4 | 302 | 57.6 | 5.243 |
| 100% | 12.9 | 900 | 309.6 | 2.907 | |
| Gemfan 5130 (GF5130R)at 21 Vmotor at 64 °C | 50% | 2.4 | 268 | 50.4 | 5.317 |
| 100% | 12.3 | 800 | 258.3 | 3.097 | |
| Gemfan 5125 (GF5125R)at 21 Vmotor at 64 °C | 50% | 2.2 | 249 | 46.2 | 5.39 |
| 100% | 10.6 | 759 | 222.6 | 3.41 | |
| HQProp T5 × 3 (HQT5*3R)at 21 Vmotor at 59 °C | 50% | 2.1 | 251 | 44.1 | 5.692 |
| 100% | 10.4 | 737 | 218.4 | 3.375 |
Source: RCinPower page image
2950KV on 3S–4S9 props
| Prop | Throttle | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| Gemfan 5125 (GF5125R)at 16 Vmotor at 78 °C | 50% | 7.2 | 453 | 115.2 | 3.932 |
| 100% | 31.6 | 1,236 | 505.6 | 2.445 | |
| HQProp T5 × 3 (HQT5*3R)at 16 Vmotor at 77 °C | 50% | 6.6 | 439 | 105.6 | 4.157 |
| 100% | 30.9 | 1,176 | 494.4 | 2.379 | |
| Gemfan D76 ducted, 5-blade (GF D76*5)at 24 Vmotor at 80 °C | 50% | 7.6 | 413 | 182.4 | 2.264 |
| 100% | 28.7 | 1,080 | 688.8 | 1.568 | |
| Gemfan D76 ducted (GF D76)at 24 Vmotor at 78 °C | 50% | 6.3 | 389 | 151.2 | 2.573 |
| 100% | 26.8 | 1,028 | 643.2 | 1.598 | |
| Gemfan 6026 (GF6026)at 12 Vmotor at 69 °C | 50% | 5.7 | 370 | 68.4 | 5.409 |
| 100% | 26.7 | 994 | 320.4 | 3.102 | |
| Gemfan 5125 (GF5125R)at 12 Vmotor at 63 °C | 50% | 4 | 257 | 48 | 5.354 |
| 100% | 20.9 | 806 | 250.8 | 3.214 | |
| Gemfan 4024 (GF4024R)at 16 Vmotor at 58 °C | 50% | 4 | 256 | 64 | 4 |
| 100% | 19.5 | 805 | 312 | 2.58 | |
| HQProp T5 × 3 (HQT5*3R)at 12 Vmotor at 62 °C | 50% | 4.5 | 287 | 54 | 5.315 |
| 100% | 20.8 | 785 | 249.6 | 3.145 | |
| Gemfan 4024 (GF4024R)at 12 Vmotor at 53 °C | 50% | 2.6 | 155 | 31.2 | 4.968 |
| 100% | 12.5 | 499 | 150 | 3.327 |
Source: RCinPower page image
3600KV on 3S–4S7 props
| Prop | Throttle | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| Gemfan 4024 (GF4024R)at 16 Vmotor at 81 °C | 50% | 7.9 | 394 | 126.4 | 3.117 |
| 100% | 35 | 1,081 | 560 | 1.93 | |
| Gemfan D90 ducted, 3-blade (GFD90*3)at 16 Vmotor at 83 °C | 50% | 10.1 | 437 | 161.6 | 2.704 |
| 100% | 36.4 | 1,049 | 582.4 | 1.801 | |
| HQProp T5 × 3 (HQT5*3R)at 12 Vmotor at 77 °C | 50% | 8.8 | 429 | 105.6 | 4.063 |
| 100% | 35.3 | 1,021 | 423.6 | 2.41 | |
| Gemfan D76 ducted, 5-blade (GFD76*5)at 16 Vmotor at 81 °C | 50% | 9.4 | 347 | 150.4 | 2.307 |
| 100% | 35.3 | 889 | 564.8 | 1.574 | |
| Gemfan D90 ducted, 3-blade (GFD90*3)at 12 Vmotor at 66 °C | 50% | 6.2 | 310 | 74.4 | 4.167 |
| 100% | 25.8 | 711 | 309.6 | 2.297 | |
| Gemfan 4024 (GF4024R)at 12 Vmotor at 63 °C | 50% | 4.8 | 234 | 57.6 | 4.063 |
| 100% | 22.6 | 699 | 271.2 | 2.577 | |
| Gemfan D76 ducted, 5-blade (GFD76*5)at 12 Vmotor at 64 °C | 50% | 5.5 | 221 | 66 | 3.348 |
| 100% | 24.4 | 589 | 292.8 | 2.012 |
Source: RCinPower page image
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 inside, M5 thread outside; the thread stands 11.5 mm above the bell. (RCinPower page image)
- Stator. The coils are wound on a stack of thin steel laminations: 21 × 5.5 mm (RCinPower names the motor 2105; its spec tables give a 5.5 mm stator height). (RCinPower page image)
- Base. 4 × M2 holes, opposite holes 12 mm apart (12 × 12). (RCinPower page image)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 2950KV 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 | 43,660 | 5,094 Hz | 30,562 |
| 4S full | 16.8 | 49,560 | 5,782 Hz | 34,692 |
| 6S nominal | 22.2 | 65,490 | 7,641 Hz | 45,843 |
| 6S full | 25.2 | 74,340 | 8,673 Hz | 52,038 |
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 RCinPower’s published sizes: the 21 × 5.5 mm stator, 25.53 mm bell, 15.2 mm height, 5 mm shaft, 12 mm mounting circle and 12 teeth and 14 magnets. Anything RCinPower 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
- RCinPower: GTS V3 2105 Plus (product page; its content is one long image). Retrieved Oct 19, 2026.
- RCinPower: GTS V3 2105 Plus page image (photos, what it is made for in Chinese, a scale photo at 20.00 g, a line-up photo of the GTS V3 21 series with their KVs, and the 1850KV, 2950KV and 3600KV spec tables, drawings and bench tables, with temperatures after 3 s at full throttle). Retrieved Oct 19, 2026.
