3- to 4-inch FPV motor
Diatone Mamba TOKA 1408
A 14 × 8 mm motor for 3- to 4-inch quads, 18 g with leads, in 2900KV for 4S–6S or 4100KV for 3S–4S; the 2900KV pulled 704 g at full throttle on a GF3028 at 24 V on Diatone's bench.
- 3- to 4-inch quads
- 6S (2900KV) or 4S (4100KV)
- 12 × 12 mm M2 motor mounts
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 1408 motor drawn from Diatone’s published sizes, not its exact design. No-load speed is KV × 22.2 V, a nominal pack for this version. Diatone’s bench tables for it step by thrust rather than throttle, so they are in the bench data below, not on this readout.
- Max thrust
- 704 g
- GF3028 prop, 24 V
- Weight
- 18 g
- with leads, both KVs
- Peak current
- 15.8 A
- full throttle
- Max power
- 376 W
- full throttle
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What you get
704 g at 24 V
At full throttle on a GF3028, the 2900KV pulled 704 g at 24 V drawing 15.75 A, and the 4100KV 616 g at 16 V drawing 19.5 A, on Diatone's bench.
Source: Diatone 2900KV spec sheet, Diatone 4100KV spec sheet
Two KVs
2900KV for 4S–6S and 4100KV for 3S–4S.
Source: Diatone product page (archived)
18 g with leads
Diatone's spec sheets weigh both KVs at 18 g with 150 mm leads.
Source: Diatone 2900KV spec sheet, Diatone 4100KV spec sheet
240 °C windings
Diatone lists 240 °C enamelled wire for the windings.
Source: Diatone product page (archived)
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 currents are 15.75 A (2900KV) and 19.5 A (4100KV): a 20 A ESC covers the 2900KV, a 25 A ESC the 4100KV. (Diatone product page (archived), Diatone 2900KV spec sheet, Diatone 4100KV spec sheet)
- Props
- 3- to 4-inch; Diatone's bench tests used a GF3028. (Diatone product page (archived), Diatone 2900KV spec sheet, Diatone 4100KV spec sheet)
- Battery
- 4S–6S for the 2900KV, tested at 24 V; 3S–4S for the 4100KV, tested at 16 V. (Diatone product page (archived), Diatone 2900KV spec sheet, Diatone 4100KV spec sheet)
- Frame
- Four M2 holes on a 12 × 12 mm pattern. (Diatone product page (archived), Diatone 2900KV spec sheet)
Where to buy
- GetFPV2900KV or 4100KV; out of stock$14.99seen Oct 19, 2026Visit
- MyFPVStore2900KV; out of stock$18.99seen Oct 19, 2026Visit
Plain links, not affiliate links. Prices change; the store’s page has the current one.
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 2,900 rpm/V (also 4100KV) | Diatone product page (archived) |
| Stator | 14 × 8 mm (1408) | Diatone product page (archived) |
| Configuration | 12N14P (12 stator slots, 14 magnet poles) (from Diatone's spec sheets; the page's text says 9N12P) | Diatone 2900KV spec sheet, Diatone 4100KV spec sheet |
| Battery | 4S–6S LiPo (16.8–25.2 V) for 2900KV (4100KV: 3S–4S (12.6–16.8 V)) | Diatone product page (archived) |
| Weight | 18 g (with leads, both KVs) | Diatone 2900KV spec sheet, Diatone 4100KV spec sheet |
| Dimensions | Φ20.6 × 18.5 mm; 16.9 mm without the shaft | Diatone product page (archived), Diatone 2900KV spec sheet |
| Shaft | 2 mm; the prop mounts on a 1.5 mm stub standing 1.6 mm above the top, which has four M2 holes on a 5 mm circle | Diatone product page (archived), Diatone 2900KV spec sheet |
| Mounting | 4 × M2 on 12 × 12 mm | Diatone product page (archived), Diatone 2900KV spec sheet |
| Bearings | 5 × 2 × 2.5 mm | Diatone product page (archived) |
| Winding | 240 °C high-temperature enamelled wire | Diatone product page (archived), Diatone 2900KV spec sheet |
| Internal resistance | 135 mΩ (4100KV 85 mΩ; the spec sheets print the unit as Ω) | Diatone product page (archived) |
| Idle current | 0.4–1.0 A at 10 V (4100KV 0.8–1.5 A at 10 V) | Diatone product page (archived) |
| Peak current | 15.75 A (4100KV 19.5 A) | Diatone product page (archived), Diatone 2900KV spec sheet |
| Max power | 376.3 W (Diatone lists 376.3 W for the 4100KV too, but its bench test reached 311.5 W at 16 V) | Diatone product page (archived), Diatone 2900KV spec sheet, Diatone 4100KV spec sheet |
| Leads | 24 AWG silicone wire, 150 mm | Diatone product page (archived), Diatone 2900KV 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.
2900KV on 4S–6S, 24 V1 prop
| Prop | Step | Current (A) | Thrust (g) | Efficiency (g/W) | RPM | Power (W) |
|---|---|---|---|---|---|---|
| GF3028 | 1.4 | 105 | 3.14 | 19005 | 33.39 | |
| 2.65 | 175 | 2.76 | 27217 | 63.29 | ||
| 4.27 | 245 | 2.4 | 32878 | 102.02 | ||
| 6.07 | 315 | 2.17 | 37751 | 145.14 | ||
| 8.9 | 385 | 1.81 | 42124 | 212.6 | ||
| 11.06 | 455 | 1.72 | 45360 | 264.3 | ||
| 12.19 | 525 | 1.8 | 48242 | 291.23 | ||
| 12.9 | 595 | 1.93 | 50149 | 308.27 | ||
| 14.73 | 665 | 1.89 | 53621 | 352.04 | ||
| Max | 15.75 | 704 | 1.87 | 55555 | 376.3 |
Source: Diatone 2900KV spec sheet
4100KV on 3S–4S, 16 V1 prop
| Prop | Step | Current (A) | Thrust (g) | Efficiency (g/W) | RPM | Power (W) |
|---|---|---|---|---|---|---|
| GF3028 | 1.82 | 90 | 3.09 | 18281 | 29.16 | |
| 3.43 | 150 | 2.73 | 25702 | 54.93 | ||
| 5.6 | 210 | 2.34 | 31008 | 89.61 | ||
| 7.65 | 270 | 2.21 | 35462 | 122.38 | ||
| 8.84 | 330 | 2.33 | 38188 | 141.45 | ||
| 10.54 | 390 | 2.31 | 41346 | 168.56 | ||
| 12.88 | 450 | 2.18 | 43610 | 206.14 | ||
| 14.96 | 510 | 2.13 | 46253 | 239.33 | ||
| 17.37 | 570 | 2.05 | 49557 | 277.95 | ||
| Max | 19.5 | 616 | 1.98 | 52631 | 311.5 |
Source: Diatone 4100KV 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. 2 mm; the prop mounts on a 1.5 mm stub standing 1.6 mm above the top, which has four M2 holes on a 5 mm circle. (Diatone product page (archived), Diatone 2900KV spec sheet)
- Stator. The coils are wound on a stack of thin steel laminations: 14 × 8 mm (1408). (Diatone product page (archived))
- Winding. 240 °C high-temperature enamelled wire. (Diatone product page (archived), Diatone 2900KV spec sheet)
- Bearings. 5 × 2 × 2.5 mm. (Diatone product page (archived))
- Base. 4 × M2 on 12 × 12 mm. (Diatone product page (archived), Diatone 2900KV spec sheet)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 2900KV 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 | 42,920 | 5,007 Hz | 30,044 |
| 4S full | 16.8 | 48,720 | 5,684 Hz | 34,104 |
| 6S nominal | 22.2 | 64,380 | 7,511 Hz | 45,066 |
| 6S full | 25.2 | 73,080 | 8,526 Hz | 51,156 |
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 14 × 8 mm stator, 20.6 mm bell, 16.9 mm height, 1.5 mm shaft, 12 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 TOKA 1408 2900KV/4100KV Racing Motor Green (product page on Diatone's own store, Wayback Machine copy captured 2025-04-28; the live page now returns 404). Retrieved Oct 19, 2026.
- Diatone: TOKA 1408-2900KV drawing, specification and test data at 24 V on a GF3028 (image on the product page). The throttle column is left out because the speeds contradict it, so the rows are thrust steps; the last row is Diatone's 100%.. Retrieved Oct 19, 2026.
- Diatone: TOKA 1408-4100KV drawing, specification and test data at 16 V on a GF3028 (image on the product page). The throttle column is left out because the speeds contradict it, so the rows are thrust steps; the last row is Diatone's 100%.. Retrieved Oct 19, 2026.
- Diatone: MAMBA TOKA 1408 main product photo (2900KV), used for finish. Retrieved Oct 19, 2026.