8- to 9-inch FPV motor
Hobbywing RTF 3110
Hobbywing’s RTF-line 3110 for 8- and 9-inch props, in 900KV and 1150KV; at full throttle on Hobbywing’s 6S bench the 900KV pulls 3626 g on an HQ 9×5×3 and the 1150KV 4126 g on an HQ 9×4×3.
- 8- to 9-inch FPV
- 6S (both KVs, rated 4S–6S)
- 8- and 9-inch three-blade props
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 3110 motor drawn from Hobbywing’s published sizes, not its exact design. Thrust, current and power are Hobbywing’s bench figures for the HQ9x5x3 prop at 24 V, read straight across between its throttle steps. Its data starts at 40% throttle.
- Max thrust
- 3,626 g
- HQ9x5x3 prop, 24 V
- Weight
- 89 g
- 1150KV 88 g; Hobbywing does not say whether the leads are included
- Peak current
- 62.9 A
- full throttle
- Max power
- 1,507 W
- full throttle
from $34.99a motor at HobbywingDirect
A set of four: $139.96
Price seen Oct 19, 2026. Plain links: we earn nothing from them.
What it pulls
Hobbywing’s own bench test, one line per prop. Drag across the chart to move the throttle; the model above follows.
At 60% with the HQ9x5x3: 1,757 g of thrust, 17.8 A, 428 W, 4.10 g per watt.
On your quad
22.3 : 1
Thrust to weight at full throttle: four motors pull 14,504 g with the HQ9x5x3 at 24 V.
At 60% throttle they pull 7,028 g, 10.8 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 $34.99
About 4.1 kg on 6S
At full throttle on Hobbywing’s 24 V bench the 1150KV pulled 4126 g on an HQ 9×4×3 at 69.1 A, and the 900KV 3626 g on an HQ 9×5×3 at 62.9 A.
Source: Hobbywing 900KV spec sheet, Hobbywing 1150KV spec sheet
Cooling rotor
Hobbywing says the rotor’s cooling structure lets the RTF 3110 and 3115 run at full load more than 50% longer than same-size motors from other brands.
Source: Hobbywing product page
Anti-slip prop mount
A grooved prop mount keeps the prop from slipping.
Source: Hobbywing product page
Multi-strand winding
Arc-shaped magnets, 0.2 mm silicon-steel laminations and a multi-strand winding of 220 °C wire, which Hobbywing says fills the slots about 5% more.
Source: Hobbywing product page
What to pair it with
Our reading of Hobbywing’s numbers, so your build matches what the motor was tested with.
- ESC
- Hobbywing lists its RTF 65A 4-in-1 6S Lite ESCs (BLS V2 or AT). Peak current is 63 A for 10 s (900KV) and 69 A for 6 s (1150KV); Hobbywing recommends no more than 6 s at full throttle for the 1150KV on an HQ 9×4×3, and 10 to 36 s for the 900KV. (Hobbywing product page, Hobbywing 900KV spec sheet, Hobbywing 1150KV spec sheet)
- Props
- Hobbywing lists the HQ 8×4.5×3, 9×4×3 and 9×5×3 for the 900KV and the HQ 8×4×3 and 9×4×3 for the 1150KV, all on 6S. (Hobbywing product page)
- Battery
- 6S, the voltage Hobbywing benched both KVs at; both are rated 4S–6S. (Hobbywing product page, Hobbywing 900KV spec sheet, Hobbywing 1150KV spec sheet)
- Frame
- Four M3 holes on a 19 mm circle; 18 AWG leads, 250 mm long. (Hobbywing product page)
Where to buy
- HobbywingDirectHobbywing’s North American store, as the XRotor FPV 3110; 900KV or 1150KV, same price$34.99seen Oct 19, 2026Visit
- ReadyMadeRC900KV$34.99seen Oct 19, 2026Visit
Plain links, not affiliate links. Prices change; the store’s page has the current one.
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 900 rpm/V (also 1150KV) | Hobbywing product page |
| Stator | 31 × 10 mm (3110) (from the model number; Hobbywing gives no separate stator size) | Hobbywing product page |
| Configuration | 12N14P (12 stator slots, 14 magnet poles) | Hobbywing product page |
| Battery | 4S–6S LiPo (both KVs) | Hobbywing product page |
| Weight | 89 g (1150KV 88 g; Hobbywing does not say whether the leads are included) | Hobbywing product page |
| Dimensions | Φ37.2 × 27 mm (27 mm from the top of the bell to the bottom of the base, which reaches 8.2 mm below the bell (drawing, S4)) | Hobbywing product page, Hobbywing drawing |
| Shaft | 5 mm with an M5 × 0.8 thread, standing 16 mm above the bell; the last 8.5 mm threaded | Hobbywing product page, Hobbywing drawing |
| Mounting | 4 × M3 holes on a 19 mm circle | Hobbywing product page, Hobbywing drawing |
| Bell | Rotor with a cooling structure; grooved, anti-slip prop mount | Hobbywing product page |
| Magnets | Arc-shaped | Hobbywing product page |
| Winding | Multi-strand, enamelled wire rated for 220 °C (C-class insulation) (from the spec sheets; the product page’s table says R class) | Hobbywing 900KV spec sheet, Hobbywing 1150KV spec sheet, Hobbywing product page |
| Internal resistance | 59 mΩ (1150KV 45 mΩ) | Hobbywing product page |
| Idle current | 2.2 A (at 24 V; 1150KV 2.8 A) | Hobbywing product page |
| Peak current | 63 A (for 10 s; 1150KV 69 A for 6 s) | Hobbywing product page |
| Max power | 1,500 W (for 10 s; 1150KV 1656 W for 6 s. Rated output 250 W (1150KV 270 W)) | Hobbywing product page |
| Leads | 18 AWG black silicone wire, 250 mm | Hobbywing product page, Hobbywing drawing |
| In the box | M5 × 0.8 flange nut; M3 × 0.5 cap screws, 11 mm long (drawn with the motor on Hobbywing’s drawing, which gives no quantities) | Hobbywing drawing |
Bench data
Redrawn from Hobbywing’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.
900KV on 4S–6S, 24 V3 props
| Prop | Throttle | Thrust (g) | Current (A) | Power (W) | RPM | Efficiency (g/W) |
|---|---|---|---|---|---|---|
| HQ9x5x3 (HQProp 9 × 5, 3-blade) | 40% | 794 | 6.7 | 161 | 7375 | 4.94 |
| 50% | 1,282 | 11.1 | 267 | 8938 | 4.8 | |
| 60% | 1,757 | 17.8 | 428 | 10218 | 4.1 | |
| 70% | 2,238 | 26.6 | 639 | 11509 | 3.51 | |
| 80% | 2,787 | 37 | 887 | 12774 | 3.14 | |
| 90% | 3,355 | 50.9 | 1222 | 13753 | 2.75 | |
| 100% | 3,626 | 62.9 | 1507 | 14312 | 2.41 | |
| HQ9x4x3 (HQProp 9 × 4, 3-blade) | 40% | 588 | 4.2 | 100 | 7786 | 5.87 |
| 50% | 944 | 7.4 | 179 | 9579 | 5.29 | |
| 60% | 1,358 | 11.9 | 286 | 11183 | 4.75 | |
| 70% | 1,829 | 17.7 | 425 | 12682 | 4.3 | |
| 80% | 2,351 | 25.2 | 604 | 14171 | 3.89 | |
| 90% | 2,884 | 34.2 | 821 | 15605 | 3.51 | |
| 100% | 3,318 | 42.7 | 1023 | 16713 | 3.24 | |
| HQ8x4.5x3 (HQProp 8 × 4.5, 3-blade) | 40% | 632 | 4.7 | 112 | 7664 | 5.62 |
| 50% | 1,004 | 8.3 | 199 | 9425 | 5.05 | |
| 60% | 1,408 | 13.2 | 317 | 10948 | 4.44 | |
| 70% | 1,837 | 19.7 | 473 | 12386 | 3.88 | |
| 80% | 2,301 | 28 | 671 | 13827 | 3.43 | |
| 90% | 2,783 | 37.9 | 908 | 15162 | 3.06 | |
| 100% | 3,201 | 48.1 | 1153 | 16147 | 2.78 |
Source: Hobbywing 900KV spec sheet
1150KV on 4S–6S, 24 V2 props
| Prop | Throttle | Thrust (g) | Current (A) | Power (W) | RPM | Efficiency (g/W) |
|---|---|---|---|---|---|---|
| HQ9x4x3 (HQProp 9 × 4, 3-blade) | 40% | 785 | 6.4 | 154 | 8732 | 5.09 |
| 50% | 1,301 | 12.8 | 307 | 10880 | 4.24 | |
| 60% | 1,748 | 19.1 | 459 | 12409 | 3.81 | |
| 70% | 2,240 | 26.5 | 636 | 13909 | 3.52 | |
| 80% | 2,949 | 38.4 | 921 | 15809 | 3.2 | |
| 90% | 3,793 | 58.1 | 1392 | 17645 | 2.73 | |
| 100% | 4,126 | 69.1 | 1656 | 18295 | 2.49 | |
| HQ8x4x3 (HQProp 8 × 4, 3-blade) | 40% | 623 | 5.5 | 132 | 9203 | 4.7 |
| 50% | 997 | 9.8 | 235 | 11309 | 4.24 | |
| 60% | 1,379 | 14.9 | 358 | 13051 | 3.86 | |
| 70% | 1,832 | 21.7 | 522 | 14853 | 3.51 | |
| 80% | 2,432 | 31.6 | 758 | 16966 | 3.21 | |
| 90% | 3,116 | 44.2 | 1061 | 18980 | 2.94 | |
| 100% | 3,523 | 53.9 | 1291 | 20074 | 2.73 |
Source: Hobbywing 1150KV 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:
- Bell. A rotor with a cooling structure and a grooved prop mount. (Hobbywing product page)
- Stator. 0.2 mm silicon-steel laminations; 12 slots and 14 magnet poles. (Hobbywing product page)
- Winding. Multi-strand winding of enamelled wire rated for 220 °C. (Hobbywing product page, Hobbywing 900KV spec sheet)
- Magnets. Arc-shaped. (Hobbywing product page)
- Shaft. 5 mm with an M5 × 0.8 thread, standing 16 mm above the bell; the last 8.5 mm is threaded. (Hobbywing product page, Hobbywing drawing)
- Base. Four M3 holes on a 19 mm circle; three 18 AWG black silicone leads, 250 mm long. (Hobbywing product page, Hobbywing drawing)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 900KV 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 | 13,320 | 1,554 Hz | 9,324 |
| 4S full | 16.8 | 15,120 | 1,764 Hz | 10,584 |
| 6S nominal | 22.2 | 19,980 | 2,331 Hz | 13,986 |
| 6S full | 25.2 | 22,680 | 2,646 Hz | 15,876 |
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 Hobbywing’s published sizes: the 31 × 10 mm stator, 37.2 mm bell, 27 mm height, 5 mm shaft, 19 mm mounting circle and 12 teeth and 14 magnets. Anything Hobbywing 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
- Hobbywing: RTF 3110/3115 FPV motors, product page shared by the line (features, a spec table with a column per motor and KV, recommended props and ESCs, downloads). Only the RTF 3110 columns are cited here. Retrieved Oct 19, 2026.
- Hobbywing: RTF-3110 900KV specification sheet (PDF linked from the product page, S1): spec table, load-performance tables at 24 V (6S) on the HQ8x4.5x3, HQ9x4x3 and HQ9x5x3 from 40% to 100% throttle, and the dimension drawing. Columns as Hobbywing gives them: throttle, thrust, current, input power, rpm, efficiency. Hobbywing’s recommended longest full-load, full-throttle run: 31 s on the HQ8x4.5x3, 36 s on the HQ9x4x3, 10 s on the HQ9x5x3. Retrieved Oct 19, 2026.
- Hobbywing: RTF-3110 1150KV specification sheet (PDF linked from the product page, S1): spec table, load-performance tables at 24 V (6S) on the HQ8x4x3 and HQ9x4x3 from 40% to 100% throttle, and the dimension drawing. Columns as Hobbywing gives them: throttle, thrust, current, input power, rpm, efficiency. Hobbywing’s recommended longest full-load, full-throttle run: 19 s on the HQ8x4x3, 6 s on the HQ9x4x3. Retrieved Oct 19, 2026.
- Hobbywing: 3110 dimension drawing (PDF, the "3110 CAD" download on the product page, S1). Retrieved Oct 19, 2026.
- Hobbywing: render of the RTF 3110 900KV (image on the product page, S1). Retrieved Oct 19, 2026.
