7-inch long-range FPV motor
Diatone KN2808
A 28 × 8 mm motor for 7-inch props on 4S–6S, 63 g with leads, that pulled 2,094 g at full throttle on a GF7037-3 on Diatone's 24 V bench.
- 7-inch quads such as Diatone's Roma F7
- 4S–6S
- 19 × 19 mm M3 motor mounts
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 2808 motor drawn from Diatone’s published sizes, not its exact design. Thrust, current and power are Diatone’s bench figures for the GF7037-3 prop at 24 V, read straight across between its throttle steps. Its data starts at 30% throttle.
- Max thrust
- 2,094 g
- GF7037-3 prop, 24 V
- Weight
- 63 g
- with leads
- Peak current
- 33.0 A
- full throttle
- Max power
- 793 W
- full throttle
from $27.99a motor at Diatone
A set of four: $111.96
Price seen Oct 19, 2026. Plain links: we earn nothing from them.
What it pulls
Diatone’s own bench test, one line per prop. Drag across the chart to move the throttle; the model above follows.
At 60% with the GF7037-3: 793 g of thrust, 8.5 A, 205 W, 3.88 g per watt.
On your quad
12.9 : 1
Thrust to weight at full throttle: four motors pull 8,376 g with the GF7037-3 at 24 V.
At 60% throttle they pull 3,172 g, 4.9 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 $27.99
About 2 kg of pull at 24 V
On Diatone's 24 V bench it pulled 2,094 g at full throttle on a GF7037-3, drawing 33.04 A.
Source: Diatone spec sheet
Two 7-inch props tested
On a GF7042-2 it pulled 1,971 g at 38.86 A and 932.4 W, the figures Diatone gives as its maximum current and power.
Source: Diatone spec sheet
Made for the Roma F7
Diatone sells it as the motor for its Roma F7 quad.
Source: Diatone product page
240 °C windings
Diatone lists 240 °C high-temperature enamelled wire for the windings.
Source: Diatone spec sheet
What to pair it with
Our reading of Diatone’s numbers, so your build matches what the motor was tested with.
- ESC
- Diatone's maximum current is 38.86 A (full throttle on a GF7042-2 at 24 V); on a GF7037-3 it drew 33.04 A. A 45 A ESC leaves headroom. (Diatone spec sheet)
- Props
- 7-inch. On Diatone's 24 V bench the GF7037-3 pulled 2,094 g at 33.04 A and the GF7042-2 1,971 g at 38.86 A. (Diatone spec sheet)
- Battery
- 4S–6S; Diatone's bench figures are at 24 V, a 6S voltage. (Diatone spec sheet)
- Frame
- Four M3 holes on a 19 × 19 mm pattern, and an M5 prop shaft. (Diatone spec sheet)
Where to buy
- Diatonethe maker's store; one motor ($110.99 for four)$27.99seen Oct 19, 2026Visit
Plain links, not affiliate links. Prices change; the store’s page has the current one.
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 1,100 rpm/V (one KV) | Diatone product page, Diatone spec sheet |
| Stator | 28 × 8 mm (2808) | Diatone spec sheet |
| Configuration | 12N14P (12 stator slots, 14 magnet poles) | Diatone spec sheet |
| Battery | 4S–6S LiPo | Diatone spec sheet |
| Weight | 63 g (with leads) | Diatone spec sheet |
| Dimensions | Ø33.4 × 23.7 mm without the shaft; the shaft stands 15.5 mm above the top | Diatone spec sheet |
| Shaft | 5 mm with an M5 thread, threaded for 8.5 mm | Diatone spec sheet |
| Mounting | 4 × M3 on 19 × 19 mm | Diatone spec sheet |
| Winding | 240 °C high-temperature enamelled wire | Diatone spec sheet |
| Internal resistance | 61.8 mΩ (phase to phase) | Diatone spec sheet |
| Peak current | 38.86 A (Diatone's maximum current: full throttle on a GF7042-2 at 24 V) | Diatone spec sheet |
| Max power | 932.4 W (full throttle on a GF7042-2 at 24 V) | Diatone spec sheet |
| Leads | 18 AWG silicone wire, 300 mm | Diatone spec sheet |
Bench data
Redrawn from Diatone’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.
1100KV on 4S–6S, 24 V2 props
| Prop | Throttle | Current (A) | Thrust (g) | Efficiency (g/W) | Power (W) |
|---|---|---|---|---|---|
| GF7037-3 | 30% | 1.25 | 171 | 5.69 | 30.1 |
| 40% | 3.05 | 327 | 4.5 | 73.2 | |
| 50% | 5.7 | 597 | 4.38 | 136.9 | |
| 60% | 8.53 | 793 | 3.88 | 204.7 | |
| 70% | 12.22 | 1,123 | 3.83 | 293.3 | |
| 80% | 17.12 | 1,349 | 3.29 | 410.9 | |
| 90% | 23.41 | 1,636 | 2.92 | 561.9 | |
| 100% | 33.04 | 2,094 | 2.64 | 792.9 | |
| GF7042-2 | 40% | 3.25 | 342 | 4.31 | 78.1 |
| 50% | 5.7 | 586 | 4.31 | 136.9 | |
| 60% | 9.1 | 792 | 3.63 | 218.5 | |
| 70% | 13.36 | 1,110 | 3.47 | 320.7 | |
| 80% | 19.17 | 1,399 | 3.05 | 460 | |
| 90% | 26.64 | 1,716 | 2.69 | 639.4 | |
| 100% | 38.86 | 1,971 | 2.12 | 932.4 |
Source: Diatone 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:
- Shaft. 5 mm with an M5 thread, threaded for 8.5 mm. (Diatone spec sheet)
- Stator. The coils are wound on a stack of thin steel laminations: 28 × 8 mm (2808). (Diatone spec sheet)
- Winding. 240 °C high-temperature enamelled wire. (Diatone spec sheet)
- Base. 4 × M3 on 19 × 19 mm. (Diatone spec sheet)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 1100KV 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 | 16,280 | 1,899 Hz | 11,396 |
| 4S full | 16.8 | 18,480 | 2,156 Hz | 12,936 |
| 6S nominal | 22.2 | 24,420 | 2,849 Hz | 17,094 |
| 6S full | 25.2 | 27,720 | 3,234 Hz | 19,404 |
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 Diatone’s published sizes: the 28 × 8 mm stator, 33.4 mm bell, 23.7 mm height, 5 mm shaft, 19 mm mounting circle and 12 teeth and 14 magnets. Anything Diatone 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
- Diatone: MAMBA 2808 1100KV Racing Motor For Roma F7 (product page on Diatone's own store, read through r.jina.ai). Retrieved Oct 19, 2026.
- Diatone: KN2808-1100KV dimension drawing, specification and test data at 24 V on the GF7037-3 and GF7042-2 (image on the product page). The speed column and each table's first row are left out (see notes).. Retrieved Oct 19, 2026.
- Diatone: KN2808 1100KV main product photo, used for finish. Retrieved Oct 19, 2026.
