2–2.5-inch whoop motor
iFlight XING 1303
A 6.5 g motor that iFlight made for 3S–4S brushless whoops: a one-piece bell, NSK bearings, and about 200 g of pull per motor on a 2.5-inch prop at 16 V.
- 2- to 2.5-inch brushless whoops
- 3S–4S
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 1303 motor drawn from iFlight’s published sizes, not its exact design. Thrust, current and power are iFlight’s bench figures for the 2540 prop at 16 V, read straight across between its throttle steps. Its data starts at 50% throttle.
- Max thrust
- 198 g
- 2540 prop, 16 V
- Weight
- 6.5 g
- with wires
- Peak current
- 6.1 A
- full throttle
- Max power
- 98 W
- full throttle
from $15.99a motor at iFlight
A set of four: $63.96
Price seen Oct 19, 2026. Plain links: we earn nothing from them.
What it pulls
iFlight’s own bench test, one line per prop. Drag across the chart to move the throttle; the model above follows.
At 60% with the 2540: 119 g of thrust, 3.0 A, 49 W, 2.45 g per watt.
On your quad
1.2 : 1
Thrust to weight at full throttle: four motors pull 792 g with the 2540 at 16 V.
At 60% throttle they pull 476 g, 0.7 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 $15.99
Made for 3–4S whoops
iFlight says it is customised for 3S–4S brushless whoop drones.
Source: iFlight product page
6.5 g with wires
On a 13 × 3 mm stator with a φ17.58 mm bell.
Source: iFlight product page
One-piece bell
iFlight lists the rotor as Unibell, its one-piece bell.
Source: iFlight 5000KV test report
NSK bearings
5 × 2 × 2 mm NSK bearings.
Source: iFlight 5000KV test report
Single-strand windings
One strand per tooth, 386 mΩ between phases.
Source: iFlight product page
What to pair it with
Our reading of iFlight’s numbers, so your build matches what the motor was tested with.
- ESC
- Rated for at least 6.13 A, the peak iFlight measured at full throttle on a 2540 prop at 16 V. Whoop AIO boards rated 10 A or more leave room to spare. (iFlight 5000KV test report)
- Props
- iFlight tested it with a 2540 (198 g at full throttle) and a 2 × 2 × 4 four-blade (180 g). The four-blade ran cooler, 40 °C against 45 °C. (iFlight 5000KV test report)
- Battery
- 3S or 4S; iFlight's bench runs are on 16 V (4S). (iFlight product page, iFlight 5000KV test report)
- Frame
- Four M2 holes on a 9 mm circle (sold as "9 × 9"). M2×5 and M2×7 screws come in the box. (iFlight product page, iFlight 5000KV test report)
Where to buy
- iFlightthe maker's store$15.99seen Oct 19, 2026Visit
- Pyrodroneprice on the store’s pageVisit
- WREKDprice on the store’s pageVisit
- GetFPVprice 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 | 5,000 rpm/V (the only KV iFlight sells) | iFlight product page |
| Stator | 13 × 3 mm (1303) | iFlight product page |
| Configuration | 12N14P (12 stator slots, 14 magnet poles) | iFlight product page |
| Battery | 3S–4S LiPo (iFlight's bench runs are at 16 V) | iFlight product page |
| Weight | 6.5 g (with wires) | iFlight product page |
| Dimensions | φ17.58 × 16 mm (shaft end to shaft tip); body 11 mm tall | iFlight 5000KV test report |
| Shaft | 1.5 mm, protrudes 4 mm | iFlight product page |
| Mounting | 4 × M2 holes (φ2 mm) on a 9 mm circle, sold as "9 × 9"; base plate 1.5 mm (iFlight's table says 9*9-φ2mm; its drawing dimensions the holes as 4-M2 on a φ9 circle) | iFlight 5000KV test report |
| Bell | Unibell (one piece) | iFlight 5000KV test report |
| Magnets | N52H, curved | iFlight product page |
| Bearings | NSK φ5 × φ2 × 2 mm | iFlight 5000KV test report |
| Winding | single-strand copper | iFlight product page |
| Interphase resistance | 386 mΩ | iFlight product page |
| Peak current | 6.13 A (100% throttle, 2540 prop, 16 V) | iFlight 5000KV test report |
| Max power | 98.1 W | iFlight product page |
| Leads | 26 AWG, 120 mm | iFlight 5000KV test report |
| In the box | 4 × M2×5 screws, 2 × M2×7 screws (the product page lists 4 × M2×7) | iFlight 5000KV test report |
Bench data
Redrawn from iFlight’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.
5000KV on 3S–4S, 16 V2 props
| Prop | Throttle | Voltage (V) | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|---|
| 2540 (2.5-inch)motor at 45 °C | 50% | 16 | 2.22 | 98 | 36 | 2.759 |
| 60% | 16 | 3.04 | 119 | 49 | 2.447 | |
| 70% | 16 | 4.12 | 139 | 66 | 2.109 | |
| 80% | 16 | 5.02 | 171 | 80 | 2.129 | |
| 90% | 16 | 5.41 | 181 | 87 | 2.091 | |
| 100% | 16 | 6.13 | 198 | 98 | 2.019 | |
| 2 × 2 × 4 (2-inch, four blades)motor at 40 °C | 50% | 16 | 1.62 | 75 | 26 | 2.894 |
| 60% | 16 | 2.49 | 107 | 40 | 2.686 | |
| 70% | 16 | 3.07 | 117 | 49 | 2.382 | |
| 80% | 16 | 4.12 | 147 | 66 | 2.23 | |
| 90% | 16 | 5.01 | 169 | 80 | 2.108 | |
| 100% | 16 | 5.39 | 180 | 86 | 2.087 |
Source: iFlight 5000KV test report
Inside the motor
A brushless outrunner: the coils stand still in the middle and the magnets spin around them. From the top down:
- Bell. One piece (iFlight's "Unibell"), φ17.58 mm, with two holes in the hub 5 mm apart. (iFlight 5000KV test report)
- Shaft. 1.5 mm, protruding 4 mm above the bell and 1 mm below the base. (iFlight 5000KV test report)
- Magnets. Curved N52H magnets, 14 poles. (iFlight product page)
- Stator. 13 × 3 mm with 12 teeth, wound with single-strand copper; 26 AWG leads, 120 mm long. (iFlight 5000KV test report)
- Bearings. NSK, 5 × 2 × 2 mm. (iFlight 5000KV test report)
- Base. 1.5 mm thick, with four M2 holes on a 9 mm circle. (iFlight 5000KV test report)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 5000KV 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 | 74,000 | 8,633 Hz | 51,800 |
| 4S full | 16.8 | 84,000 | 9,800 Hz | 58,800 |
| 6S nominal | 22.2 | 111,000 | 12,950 Hz | 77,700 |
| 6S full | 25.2 | 126,000 | 14,700 Hz | 88,200 |
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 iFlight’s published sizes: the 13 × 3 mm stator, 17.58 mm bell, 11 mm height, 1.5 mm shaft, 9 mm mounting circle and 12 teeth and 14 magnets. Anything iFlight 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
- iFlight: XING 1303 5000KV FPV Motor (product page, with its product photo). Retrieved Oct 19, 2026.
- iFlight: XING 1303 5000KV test report (spec table, dimension drawing, thrust data). Retrieved Oct 19, 2026.