8- to 9-inch FPV motor
Hobbywing RTF 2812
Hobbywing’s RTF-line 2812 for 8- and 9-inch props, in 900KV and 1100KV; on Hobbywing’s 6S bench the 900KV pulls 3355 g on an HQ 9×5×3 and the 1100KV 3722 g on an HQ 8×4.5×3 at full throttle.
- 8- to 9-inch FPV
- 6S (both KVs, rated 4S–6S)
- 9-inch props (900KV) or 8-inch props (both KVs)
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 2812 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
- 3,355 g
- HQ9x5x3 prop, 24 V
- Weight
- 83.4 g
- 1100KV 83.8 g; Hobbywing does not say whether the leads are included
- Peak current
- 49.6 A
- full throttle
- Max power
- 1,191 W
- full throttle
from $26.99a motor at HobbywingDirect
A set of four: $107.96
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: 1,483 g of thrust, 14.4 A, 346 W, 4.29 g per watt.
On your quad
20.6 : 1
Thrust to weight at full throttle: four motors pull 13,420 g with the HQ9x5x3 at 24 V.
At 60% throttle they pull 5,932 g, 9.1 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 $26.99
Up to 3.7 kg on 6S
At full throttle on Hobbywing’s 24 V bench the 1100KV pulled 3722 g on an HQ 8×4.5×3 at 64.1 A, and the 900KV 3355 g on an HQ 9×5×3 at 49.6 A.
Source: Hobbywing 900KV spec sheet, Hobbywing 1100KV spec sheet
Efficiency under load
Hobbywing says the 2812 is about 5% more efficient under heavy load than same-size motors from other brands.
Source: Hobbywing product page
Cooling rotor
The rotor has a cooling structure; Hobbywing says it runs at full load more than 40% 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. Inside are arc-shaped magnets, 0.2 mm silicon-steel laminations and a multi-strand winding of 220 °C wire.
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 49.6 A for 9 s (900KV) and 64.1 A for 10 s (1100KV), the figures its full-throttle bench runs reached. (Hobbywing product page, Hobbywing 900KV spec sheet, Hobbywing 1100KV spec sheet)
- Props
- Hobbywing lists the HQ 8×4.5×3R and 9×5×3 for the 900KV and the HQ 8×4.5×3R for the 1100KV. On the 8-inch prop the 900KV is the gentler of the two: 2771 g at 37.9 A, against 3722 g at 64.1 A for the 1100KV. (Hobbywing product page, Hobbywing 900KV spec sheet, Hobbywing 1100KV spec sheet)
- Battery
- 6S, the voltage Hobbywing benched both KVs at; both are rated 4S–6S. (Hobbywing product page, Hobbywing 900KV spec sheet, Hobbywing 1100KV 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 2812; 900KV or 1100KV, same price$26.99seen Oct 19, 2026Visit
- Unmanned Tech900KV or 1100KVprice 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 | 900 rpm/V (also 1100KV) | Hobbywing product page |
| Stator | 28 × 12 mm (2812) (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 | 83.4 g (1100KV 83.8 g; Hobbywing does not say whether the leads are included) | Hobbywing product page |
| Dimensions | Φ34 × 25.5 mm (25.5 mm from the top of the bell to the bottom of the base, which reaches 6.2 mm below the bell (drawing, S4)) | Hobbywing product page, Hobbywing drawing |
| Shaft | 5 mm with an M5 × 0.8 thread, standing 15 mm above the bell; the last 9 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) | Hobbywing product page, Hobbywing 900KV spec sheet, Hobbywing 1100KV spec sheet |
| Internal resistance | 63.9 mΩ (1100KV 46.6 mΩ) | Hobbywing product page |
| Idle current | 1.5 A (at 24 V; 1100KV 1.88 A) | Hobbywing product page |
| Peak current | 49.6 A (for 9 s; 1100KV 64.1 A for 10 s) | Hobbywing product page |
| Max power | 1,191 W (for 9 s; 1100KV 1538 W for 10 s. Rated output 200 W (1100KV 250 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 V2 props
| Prop | Throttle | Thrust (g) | Current (A) | Power (W) | RPM | Efficiency (g/W) |
|---|---|---|---|---|---|---|
| HQ9x5x3 (HQProp 9 × 5, 3-blade) | 40% | 705 | 5.2 | 126 | 6899 | 5.59 |
| 50% | 1,073 | 9.2 | 220 | 8381 | 4.87 | |
| 60% | 1,483 | 14.4 | 346 | 9696 | 4.29 | |
| 70% | 1,937 | 21.1 | 508 | 10924 | 3.82 | |
| 80% | 2,435 | 29.6 | 712 | 12107 | 3.42 | |
| 90% | 2,941 | 39.8 | 955 | 13169 | 3.08 | |
| 100% | 3,355 | 49.6 | 1191 | 13930 | 2.82 | |
| HQ8x4.5x3R (HQProp 8 × 4.5, 3-blade) | 40% | 534 | 3.9 | 94 | 7140 | 5.68 |
| 50% | 842 | 6.9 | 166 | 8783 | 5.08 | |
| 60% | 1,182 | 10.9 | 262 | 10250 | 4.51 | |
| 70% | 1,554 | 16 | 386 | 11624 | 4.03 | |
| 80% | 1,966 | 22.5 | 541 | 12976 | 3.63 | |
| 90% | 2,399 | 30.2 | 726 | 14250 | 3.3 | |
| 100% | 2,771 | 37.9 | 912 | 15275 | 3.04 |
Source: Hobbywing 900KV spec sheet
1100KV on 4S–6S, 24 V1 prop
| Prop | Throttle | Thrust (g) | Current (A) | Power (W) | RPM | Efficiency (g/W) |
|---|---|---|---|---|---|---|
| HQ8x4.5x3R (HQProp 8 × 4.5, 3-blade) | 40% | 839 | 6.6 | 159 | 8581 | 5.28 |
| 50% | 1,270 | 11.7 | 282 | 10422 | 4.5 | |
| 60% | 1,725 | 18.4 | 442 | 12043 | 3.9 | |
| 70% | 2,211 | 26.8 | 644 | 13563 | 3.44 | |
| 80% | 2,741 | 37.6 | 904 | 15041 | 3.03 | |
| 90% | 3,286 | 51.1 | 1226 | 16340 | 2.68 | |
| 100% | 3,722 | 64.1 | 1538 | 17186 | 2.42 |
Source: Hobbywing 1100KV 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 15 mm above the bell; the last 9 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 28 × 12 mm stator, 34 mm bell, 25.5 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 2807/2810/2812/2814 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 2812 columns are cited here. Retrieved Oct 19, 2026.
- Hobbywing: RTF-2812SL 900KV specification sheet (PDF linked from the product page, S1): spec table, load-performance tables at 24 V (6S) on the HQ8x4.5x3R 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: 40 s on the HQ8x4.5x3R, 14 s on the HQ9x5x3. Retrieved Oct 19, 2026.
- Hobbywing: RTF-2812SL 1100KV specification sheet (PDF linked from the product page, S1): spec table, load-performance tables at 24 V (6S) on the HQ8x4.5x3R 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: 15 s on the HQ8x4.5x3R. Retrieved Oct 19, 2026.
- Hobbywing: 2812 dimension drawing (PDF, the "2812 CAD" download on the product page, S1). Retrieved Oct 19, 2026.
- Hobbywing: render of the RTF 2812 900KV (image on the product page, S1). Retrieved Oct 19, 2026.
