3.5-inch cinewhoop motor
Axisflying C157-2 1507
A 1507 upgrade motor for DJI Avata builds on 3.5-inch props: 13.58 g, 3750KV on 4S, and 670 g at full throttle on an HQ T90-4P.
- DJI Avata upgrades and Avata 3.5-inch frames
- 4S
- 3.5-inch cinewhoop props
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 1507 motor drawn from Axisflying’s published sizes, not its exact design. Thrust, current and power are Axisflying’s bench figures for the HQ T90-4P prop at 16 V, read straight across between its throttle steps. Its data starts at 30% throttle.
- Max thrust
- 670 g
- HQ T90-4P prop, 16 V
- Weight
- 13.58 g
- with wire; the page text says 14.5 g with cables
- Peak current
- 31.7 A
- full throttle
- Max power
- 507 W
- full throttle
from $19.90a motor at Axisflying
A set of four: $79.60
Price seen Oct 19, 2026. Plain links: we earn nothing from them.
What it pulls
Axisflying’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 T90-4P: 392 g of thrust, 13.3 A, 212 W, 1.84 g per watt.
On your quad
4.1 : 1
Thrust to weight at full throttle: four motors pull 2,680 g with the HQ T90-4P at 16 V.
At 60% throttle they pull 1,568 g, 2.4 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 $19.90
For Avata builds
Axisflying sells the C157-2 as an upgrade for DJI Avata on 3.5-inch props, and says it gives more power and less prop wash than the stock motor.
Shielded bearings
Axisflying's bearing shield houses the bearings to an IP53 rating against dust and water.
Source: Axisflying product page
Bench numbers
670 g at 31.66 A (506.56 W) at full throttle on an HQ T90-4P at 16 V.
Source: Axisflying test data
What to pair it with
Our reading of Axisflying’s numbers, so your build matches what the motor was tested with.
- ESC
- 31.66 A at full throttle on Axisflying's 4S bench; its page text says the current runs to about 25 A. (Axisflying product page, Axisflying test data)
- Props
- Rated for DJI Avata props on 4S; Axisflying's bench used HQ T90-4P 3.5-inch props. (Axisflying product page, Axisflying test data)
- Battery
- 4S. (Axisflying drawing and specs)
- Frame
- Four M2 screws on a 12 mm circle. (Axisflying drawing and specs)
Where to buy
- Axisflyingthe maker's store; the KV option reads 260KV; $75.60 for four$19.90seen Oct 19, 2026Visit
Plain links, not affiliate links. Prices change; the store’s page has the current one.
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 3,750 rpm/V | Axisflying product page, Axisflying drawing and specs |
| Stator | 15 × 7 mm (1507) | Axisflying product page |
| Configuration | 12N14P (12 stator slots, 14 magnet poles) | Axisflying drawing and specs |
| Battery | 4S LiPo | Axisflying drawing and specs |
| Weight | 13.58 g (with wire; the page text says 14.5 g with cables) | Axisflying drawing and specs |
| Dimensions | φ19 × 18.3 mm, with 2 mm of shaft above the bell (the page text says φ19 × 18.9 mm) | Axisflying drawing and specs |
| Shaft | 1.5 mm, protrudes 2 mm; 4 × M2 prop holes on a 5 mm circle in the top (Axisflying's spec table labels the 1.5 mm "wheelbase") | Axisflying drawing and specs |
| Mounting | 4 × M2 on a 12 mm circle (the page text says 3 × M2 on a 10 mm circle) | Axisflying drawing and specs |
| Magnets | N52H arc magnets | Axisflying product page |
| Bearings | Behind Axisflying's IP53-rated bearing shield (Axisflying calls it Bearing Shield Technology: a dust- and water-resistant bearing housing) | Axisflying product page |
| Internal resistance | 83 mΩ | Axisflying drawing and specs |
| Max current | 31.66 A (at full throttle on an HQ T90-4P at 16 V (S3); the page text says about 25 A) | Axisflying drawing and specs |
| Max power | 506.56 W | Axisflying drawing and specs |
| Leads | 22 AWG silicone, 100 mm (the page text says 24 AWG) | Axisflying drawing and specs |
| In the box | 1 motor and 7 screws (2 long, 5 short) (as pictured; the page text lists 3 × M2×4 motor screws and 2 × M2×7 screws to hold the props) | Axisflying test data |
Bench data
Redrawn from Axisflying’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.
3750KV on 4S, 16 V1 prop
| Prop | Throttle | Voltage (V) | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|---|
| HQ T90-4P | 30% | 16 | 4.44 | 179 | 71.04 | 2.52 |
| 40% | 16 | 7 | 239 | 112 | 2.13 | |
| 50% | 16 | 10.06 | 324 | 160.96 | 2.01 | |
| 60% | 16 | 13.28 | 392 | 212.48 | 1.84 | |
| 70% | 16 | 17.8 | 474 | 284.8 | 1.66 | |
| 80% | 16 | 22.27 | 544 | 356.32 | 1.53 | |
| 90% | 16 | 27.02 | 623 | 432.32 | 1.44 | |
| 100% | 16 | 31.66 | 670 | 506.56 | 1.32 |
Source: Axisflying test 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 gunmetal eight-spoke top and a red ring round the bell's top edge. (Axisflying product photo)
- Base. Gunmetal. (Axisflying product photo)
- Shaft. 1.5 mm, standing 2 mm above the bell; props fix to four M2 holes on a 5 mm circle in the top. (Axisflying drawing and specs)
- Stator. 15 × 7 mm, 12 slots, with 14 N52H arc magnets in the bell. (Axisflying product page, Axisflying drawing and specs)
- Leads. 22 AWG silicone wire, 100 mm. (Axisflying drawing and specs)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 3750KV 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 | 55,500 | 6,475 Hz | 38,850 |
| 4S full | 16.8 | 63,000 | 7,350 Hz | 44,100 |
| 6S nominal | 22.2 | 83,250 | 9,713 Hz | 58,275 |
| 6S full | 25.2 | 94,500 | 11,025 Hz | 66,150 |
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 Axisflying’s published sizes: the 15 × 7 mm stator, 19 mm bell, 16.3 mm height, 1.5 mm shaft, 12 mm mounting circle and 12 teeth and 14 magnets. Anything Axisflying 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
- Axisflying: Motors C157-2 4s (product page). Retrieved Oct 19, 2026.
- Axisflying: C157-2 outline drawing and spec table (image on the product page). Retrieved Oct 19, 2026.
- Axisflying: C157-2 3750KV testing data on HQ T90-4P props at 16 V, and product list (image on the product page). Axisflying's rpm column is left out: it falls at 90% and 100% throttle (26014 and 23195 rpm, below the 80% row's 26828) while thrust keeps rising. The 20% row is left out (see modelNotes).. Retrieved Oct 19, 2026.
- Axisflying: Cine157-2 intro image ("Suitable for AVATA 3.5"; image on the product page). Retrieved Oct 19, 2026.
- Axisflying: C157-2 3750KV main product photo, used for finish. Retrieved Oct 19, 2026.
- Axisflying: C157 brushless motor 1507 for DJI Avata 2.9, 3650KV (product page of the earlier motor, whose text the C157-2 page repeats). Retrieved Oct 19, 2026.
