5-inch FPV freestyle motor
Xnova 2207 Smooth Line
Xnova's 2207 Smooth Line for freestyle and smooth video flying, about 35 g; the 1850KV pulls 1,350 g on an HQ R38 at 22.2 V in Xnova's test.
- Freestyle and smooth video flying
- 6S (1700KV, 1850KV) or 3–4S (2400KV, 2750KV)
- Props on an M5 shaft
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 2207 motor drawn from Xnova’s published sizes, not its exact design. Thrust, current and power are Xnova’s bench figures for the HQ R38 prop at 22.2 V, read straight across between its throttle steps. Its data starts at 10% throttle.
- Max thrust
- 1,350 g
- HQ R38 prop, 22.2 V
- Weight
- 35.2 g
- 34.6 g (1700KV), 35 g (2400KV), 35.2 g (2750KV)
- Peak current
- 29.7 A
- full throttle
- Max power
- 659 W
- full throttle
from $112.99a motor at Pyrodrone
A set of four: $451.96
Price seen Oct 19, 2026. Plain links: we earn nothing from them.
What it pulls
Xnova’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 R38: 735 g of thrust, 13.5 A, 300 W, 2.45 g per watt.
On your quad
8.3 : 1
Thrust to weight at full throttle: four motors pull 5,400 g with the HQ R38 at 22.2 V.
At 60% throttle they pull 2,940 g, 4.5 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 $112.99
Four KVs, about 35 g
1700KV for 5–6S, 1850KV for 4–6S, and 2400KV and 2750KV for 3–4S, each weighing 34.6–35.2 g.
Source: Xnova data list
Made for smooth video
Xnova pitches the Smooth Line at smooth flight video recording.
Source: Xnova product page
Smooth and balanced
Xnova lists low cogging torque and smooth running, and says the motors are precisely balanced and fully tested.
Source: Xnova product page
Bench numbers
On 22.2 V the 1850KV pulls 1,350 g on an HQ R38 at 29.7 A, and 1,215 g on a GF 4934 at 27.5 A.
Source: Xnova 1850KV prop data
What to pair it with
Our reading of Xnova’s numbers, so your build matches what the motor was tested with.
- ESC
- The 1850KV draws 29.7 A at full throttle on Xnova's 22.2 V bench (HQ R38) and 27.5 A on a GF 4934. Xnova publishes no bench data for the other KVs. (Xnova 1850KV prop data)
- Props
- Xnova tested the 1850KV on an HQ R38 and a GF 4934. Props fit the M5 shaft. (Xnova 1850KV prop data, Xnova drawing)
- Battery
- 5–6S (1700KV), 4–6S (1850KV), 3–4S (2400KV, 2750KV). (Xnova data list)
- Frame
- Four M3 screws, opposite holes 16 mm apart (the 16 × 16 pattern). (Xnova drawing)
Where to buy
- Pyrodroneset of 4; choose the KV$112.99seen Oct 19, 2026Visit
Plain links, not affiliate links. Prices change; the store’s page has the current one.
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 1,850 rpm/V (Xnova gives 1840–1850 rpm/V; also 1700KV, 2400KV and 2750KV) | Xnova data list |
| Stator | 22 × 7 mm (2207) (from the size in Xnova's name) | Xnova product page |
| Battery | 4S–6S LiPo (for the 1850KV; 5–6S (1700KV), 3–4S (2400KV, 2750KV)) | Xnova data list |
| Weight | 35.2 g (34.6 g (1700KV), 35 g (2400KV), 35.2 g (2750KV)) | Xnova data list |
| Dimensions | φ27.8 × 33.8 mm (with shaft); body 19.8 mm tall | Xnova drawing |
| Shaft | M5 threaded, 14 mm above the bell (33.8 mm overall less the 19.8 mm body) | Xnova drawing |
| Mounting | 4 × M3, opposite holes 16 mm apart (16 × 16) | Xnova drawing |
| Resistance | 80 mΩ (96 (1700KV), 52 (2400KV), 42 (2750KV). Xnova's sheet prints no unit; its other data lists give resistance in milliohms.) | Xnova data list |
| No-load current | 1 A (at 10 V; 0.7 A (1700KV), 1.2 A (2400KV), 1.4 A (2750KV)) | Xnova data list |
| Peak current | 29.7 A (100% throttle, HQ R38, 22.2 V; 27.5 A on a GF 4934) | Xnova 1850KV prop data |
| Max power | 659.34 W (same test) | Xnova 1850KV prop data |
Bench data
Redrawn from Xnova’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 4S–6S, 22.2 V2 props
| Prop | Throttle | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| HQ R38 (HQProp R38) | 10% | 1.1 | 102 | 24.42 | 4.18 |
| 20% | 2.9 | 235 | 64.38 | 3.65 | |
| 30% | 5.1 | 370 | 113.22 | 3.27 | |
| 40% | 7.7 | 500 | 170.94 | 2.93 | |
| 50% | 10.1 | 620 | 224.22 | 2.77 | |
| 60% | 13.5 | 735 | 299.7 | 2.45 | |
| 70% | 15.5 | 850 | 344.1 | 2.47 | |
| 80% | 20.2 | 1,045 | 448.44 | 2.33 | |
| 90% | 26.8 | 1,250 | 594.96 | 2.1 | |
| 100% | 29.7 | 1,350 | 659.34 | 2.05 | |
| GF 4934 (Gemfan 4934) | 10% | 1.1 | 97 | 24.42 | 3.97 |
| 20% | 2.9 | 223 | 64.38 | 3.46 | |
| 30% | 5.1 | 344 | 113.22 | 3.04 | |
| 40% | 7.5 | 456 | 166.5 | 2.74 | |
| 50% | 9.8 | 559 | 217.56 | 2.57 | |
| 60% | 12.2 | 655 | 270.84 | 2.42 | |
| 70% | 14.5 | 750 | 321.9 | 2.33 | |
| 80% | 19.3 | 935 | 428.46 | 2.18 | |
| 90% | 24.9 | 1,110 | 552.78 | 2.01 | |
| 100% | 27.5 | 1,215 | 610.5 | 1.99 |
Source: Xnova 1850KV prop data
Inside the motor
A brushless outrunner: the coils stand still in the middle and the magnets spin around them. From the top down:
- Bell. Black, with a red ring round the top of the bell, red cut edges on a five-spoke top and a red hub. (Xnova drawing, Xnova product photo, Xnova top photo)
- Shaft. M5 thread, 14 mm above the bell. (Xnova drawing)
- Base. Black, with four M3 holes, opposite holes 16 mm apart. (Xnova drawing, Xnova product photo)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 1850KV 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 | 27,380 | 3,194 Hz | 19,166 |
| 4S full | 16.8 | 31,080 | 3,626 Hz | 21,756 |
| 6S nominal | 22.2 | 41,070 | 4,792 Hz | 28,749 |
| 6S full | 25.2 | 46,620 | 5,439 Hz | 32,634 |
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 Xnova’s published sizes: the 22 × 7 mm stator, 27.8 mm bell, 19.8 mm height, 5 mm shaft and 16 mm mounting circle. Anything Xnova 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
- Xnova: NEW! Xnova 2207 freestyle smooth line motor series. 1700kv_1850kv_2400kv_2750kv (product page). Retrieved Oct 19, 2026.
- Xnova: Freestyle Smooth Line 2207 Data List for FS 07-1700, FS 07-1850, FS 07-2400 and FS 07-2750 (rpm per volt, no-load current, weight, battery and resistance; image on the product page). The resistance row prints no unit.. Retrieved Oct 19, 2026.
- Xnova: Smooth Line 2207-1850KV propeller data, two props (image on the product page, dated 2025-01-09). Retrieved Oct 19, 2026.
- Xnova: Freestyle Smooth Line outline drawing (image on the product page). Retrieved Oct 19, 2026.
- Xnova: Freestyle Smooth Line product photo, side view (image on the product page), used for finish. Retrieved Oct 19, 2026.
- Xnova: Freestyle Smooth Line product photo of two motors, side and top (image on the product page), used for finish. Retrieved Oct 19, 2026.
