5-inch FPV freestyle motor
iFlight XING2 2405
A 5-inch motor on a 24 × 5 mm stator: a one-piece 7075 bell, a 5 mm titanium shaft, 30.7 g with wires, and 1.5 kg of pull per motor on iFlight's 24 V bench (1800KV, 51499 prop).
- 5-inch freestyle
- 6S, as iFlight tested both KVs
- 5.1-inch props
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 2405 motor drawn from iFlight’s published sizes, not its exact design. Thrust, current and power are iFlight’s bench figures for the 51499 prop at 24 V, read straight across between its throttle steps. Its data starts at 50% throttle.
- Max thrust
- 1,504 g
- 51499 prop, 24 V
- Weight
- 30.7 g
- with wires; 31.4 g for 1950KV
- Peak current
- 35.6 A
- full throttle
- Max power
- 855 W
- full throttle
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 51499: 865 g of thrust, 12.7 A, 304 W, 2.84 g per watt.
On your quad
9.3 : 1
Thrust to weight at full throttle: four motors pull 6,016 g with the 51499 at 24 V.
At 60% throttle they pull 3,460 g, 5.3 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
5 mm titanium shaft
iFlight calls it its strongest prop shaft yet. It protrudes 15 mm, with 9 mm of M5 thread.
One-piece 7075 bell
iFlight's Unibell, which it calls crash resistant.
Source: iFlight product page
NSK 9 × 4 × 4 bearings
With iFlight's O-ring protecting the bearing gap.
Source: iFlight product page
Centre-slotted N52H magnets
Curved arc magnets that iFlight says cut the motor's response time, set with the air gap kept to a minimum.
Source: iFlight product page
Wire protector, balanced
A protector on the base guards the motor wires, and each motor is dynamically balanced.
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 the motor's peak current at 24 V: 35.6 A for the 1800KV and 41.3 A for the 1950KV, both on the 51499. A 45 A or bigger ESC covers either. (iFlight 1800KV datasheet, iFlight 1950KV datasheet)
- Props
- iFlight tested both KVs with a 51499 and a 5140. The 51499 pulled more at full throttle: 1504 g against 1247 g on the 1800KV, and 1595 g against 1324 g on the 1950KV. (iFlight 1800KV datasheet, iFlight 1950KV datasheet)
- Battery
- 6S. iFlight sells it as a 4S–6S motor, but gives 24 V as the input and tested both KVs at 24 V. (iFlight product page, iFlight 1800KV datasheet, iFlight 1950KV datasheet)
- Frame
- Four M3 holes on a 16 mm circle (sold as "16 × 16"). Four M3 × 7 screws and an M5 flange nut come in the box. (iFlight product page, iFlight 1800KV datasheet)
Where to buy
- iFlightthe maker's store; one motor, same price for both KVs; the 1800KV was out of stock$23.99seen Oct 19, 2026Visit
Plain links, not affiliate links. Prices change; the store’s page has the current one.
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 1,800 rpm/V (also 1950KV) | iFlight product page |
| Stator | 24 × 5 mm (2405) | iFlight product page |
| Configuration | 12N14P (12 stator slots, 14 magnet poles) | iFlight product page |
| Battery | 4S–6S LiPo; iFlight gives 24 V as the input | iFlight product page |
| Weight | 30.7 g (with wires; 31.4 g for 1950KV) | iFlight product page |
| Dimensions | φ31 × 31.9 mm (with shaft); body 16.9 mm tall | iFlight 1800KV datasheet |
| Shaft | 5 mm titanium alloy, protrudes 15 mm, with 9 mm of M5 thread | iFlight product page, iFlight 1800KV datasheet |
| Mounting | 4 × M3 holes (φ3 mm) on a 16 mm circle, sold as "16 × 16"; base plate 2.5 mm (iFlight's table says 16*16-φ3mm; its drawing dimensions the holes as 4-M3 on a φ16 circle) | iFlight 1800KV datasheet |
| Bell | 7075 aluminium, Unibell (one piece) | iFlight product page |
| Magnets | N52H curved arc magnets, centre-slotted | iFlight product page |
| Bearings | NSK φ9 × φ4 × 4 mm (the 1950KV datasheet gives the bearing type as NSK/NMB) | iFlight product page |
| Winding | single-strand copper | iFlight product page |
| Interphase resistance | 82.6 mΩ (1950KV: 81.6 mΩ on its datasheet (S3), 69.4 mΩ on the product page) | iFlight product page |
| Peak current | 35.63 A (100% throttle, 51499 prop, 24 V. 41.32 A for 1950KV in its bench table and on the product page; the 1950KV datasheet's spec table says 68.52 A) | iFlight 1800KV datasheet |
| Max power | 855 W (992 W for 1950KV in its bench table and on the product page; the 1950KV datasheet's spec table says 1644 W) | iFlight 1800KV datasheet |
| Leads | 20 AWG, 160 mm | iFlight product page |
| In the box | 4 × M3×7 screws, 1 × M5 flange nut (the 1950KV datasheet lists M3×8 screws) | iFlight product page |
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.
1800KV on 6S, 24 V2 props
| Prop | Throttle | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| 51499 (5.1 × 4.99)motor at 77 °C | 50% | 8.78 | 653 | 211 | 3.099 |
| 60% | 12.68 | 865 | 304 | 2.842 | |
| 70% | 21.57 | 1,028 | 518 | 1.986 | |
| 80% | 29.87 | 1,367 | 717 | 1.907 | |
| 90% | 32.58 | 1,417 | 782 | 1.812 | |
| 100% | 35.63 | 1,504 | 855 | 1.759 | |
| 5140 (5.1 × 4)motor at 65 °C | 50% | 7.57 | 573 | 182 | 3.154 |
| 60% | 11.73 | 761 | 282 | 2.703 | |
| 70% | 20.83 | 921 | 500 | 1.842 | |
| 80% | 26.22 | 1,087 | 629 | 1.727 | |
| 90% | 29.82 | 1,181 | 716 | 1.65 | |
| 100% | 32.86 | 1,247 | 789 | 1.581 |
Source: iFlight 1800KV datasheet
1950KV on 6S, 24 V2 props
| Prop | Throttle | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| 51499 (5.1 × 4.99)motor at 78 °C | 50% | 10.47 | 741 | 251 | 2.949 |
| 60% | 16.57 | 835 | 398 | 2.1 | |
| 70% | 22.98 | 1,058 | 552 | 1.918 | |
| 80% | 29.45 | 1,208 | 707 | 1.709 | |
| 90% | 35.87 | 1,463 | 861 | 1.699 | |
| 100% | 41.32 | 1,595 | 992 | 1.608 | |
| 5140 (5.1 × 4)motor at 68 °C | 50% | 9.05 | 625 | 217 | 2.878 |
| 60% | 14.46 | 820 | 347 | 2.363 | |
| 70% | 20.76 | 985 | 498 | 1.977 | |
| 80% | 27.25 | 1,135 | 654 | 1.735 | |
| 90% | 33.87 | 1,259 | 813 | 1.549 | |
| 100% | 36.91 | 1,324 | 886 | 1.495 |
Source: iFlight 1950KV datasheet
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 of 7075 aluminium (iFlight's "Unibell"), φ31 mm, with five spokes across the top that each fork in two toward the rim. (iFlight product page, iFlight 1800KV datasheet)
- Shaft. 5 mm titanium alloy, protruding 15 mm, with 9 mm of M5 thread; the last 1 mm narrows to 3.8 mm. (iFlight product page, iFlight 1800KV datasheet)
- Magnets. Curved, centre-slotted N52H arc magnets, 14 poles. (iFlight product page)
- Stator. 24 × 5 mm with 12 teeth, wound with single-strand copper; 20 AWG leads, 160 mm long. (iFlight product page)
- Bearings. NSK, 9 × 4 × 4 mm, with an O-ring that iFlight says protects the bearing gap. (iFlight product page)
- Base. 2.5 mm thick, with four M3 holes on a 16 mm circle and a protector for the motor wires. (iFlight product page, iFlight 1800KV datasheet)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 1800KV 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 | 26,640 | 3,108 Hz | 18,648 |
| 4S full | 16.8 | 30,240 | 3,528 Hz | 21,168 |
| 6S nominal | 22.2 | 39,960 | 4,662 Hz | 27,972 |
| 6S full | 25.2 | 45,360 | 5,292 Hz | 31,752 |
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 24 × 5 mm stator, 31 mm bell, 16.9 mm height, 5 mm shaft, 16 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: XING2 2405 4S 6S FPV Motor (product page, with its product photo). Retrieved Oct 19, 2026.
- iFlight: XING2 2405 1800KV Motor Datasheet (PDF in iFlight's technical-support downloads: spec table, dimension drawing, thrust data). Retrieved Oct 19, 2026.
- iFlight: XING2 2405 1950KV Motor Datasheet (PDF in iFlight's technical-support downloads: spec table, dimension drawing, thrust data). Retrieved Oct 19, 2026.
- iFlight: technical support downloads (lists the XING2 2405 1800KV and 1950KV Motor Datasheets). Retrieved Oct 19, 2026.