50*74mm
12N14P
220℃
6mm
350g
＞1000h
| AT4125 Basic Data | |
| Parameter:Long Shaft KV250 | Weight (with leads):350g/355g |
| Test Model:KV250/KV540 | Phase-to-phase Internal Resistance:68m/14m |
| Motor Dimensions:50*74mm | Slot-pole Configuration:12N14P |
| Lead Specification:100mm | Rated Operating Voltage (Lipo):12S |
| Shaft Diameter:6mm | Maximum Current (180s):50A/85A |
| No-load Current (10V):1.0A/2.6A | Maximum Continuous Power:365W/446W |
| MODEL | KV Value | maximum power | Maximum current | pull | Efficiency | Applicable blades | Number of batteries | Adapt to electric adjustment | |
| BGS-FW4125 | KV | W | A | g | g/W | / | S | A | |
| 250 | 1744.46 | 39.92 | 5838 | 3.35 | APC15*8 | 12 | 40 | ||
| 250 | 2049.62 | 47.04 | 7053 | 3.44 | APC16*8 | 12 | 40 | ||
| 540 | 1554.08 | 72.77 | 5537 | 3.56 | APC15*8 | 6 | 40 | ||
| 540 | 1718.70 | 81.72 | 6618 | 3.85 | APC16*8 | 6 | 40 | ||
| Model | accelerator | Voltage | Pulling Force | Torque | Current | speed | Power | Efficiency | Motor temperature |
| BGS-FW4125 KV250 APC15*8 | % | V | g | N.m | A | rpm | W | g/W | ℃ |
| 40.% | 44.37 | 1027 | 0.210 | 2.76 | 3922 | 122.38 | 8.39 | 78 | |
| 45.% | 44.34 | 1242 | 0.254 | 3.42 | 4319 | 151.62 | 8.19 | ||
| 50.% | 44.31 | 1631 | 0.334 | 5.02 | 4911 | 222.62 | 7.33 | ||
| 55.% | 44.28 | 2042 | 0.419 | 6.78 | 5453 | 300.43 | 6.80 | ||
| 60.% | 44.25 | 2433 | 0.502 | 8.71 | 5931 | 385.57 | 6.31 | ||
| 65.% | 44.20 | 2791 | 0.579 | 10.86 | 6368 | 479.91 | 5.82 | ||
| 70.% | 44.16 | 3213 | 0.669 | 13.22 | 6767 | 583.56 | 5.51 | ||
| 75.% | 44.10 | 3719 | 0.779 | 16.36 | 7237 | 721.40 | 5.15 | ||
| 80.% | 44.04 | 4220 | 0.893 | 19.79 | 7703 | 871.73 | 4.84 | ||
| 90.% | 43.90 | 5078 | 1.153 | 28.10 | 8406 | 1233.40 | 4.12 | ||
| 100.% | 43.70 | 5838 | 1.473 | 39.92 | 9145 | 1744.46 | 3.35 | ||
| BGS-FW4125 KV250 APC16*8 | 40.% | 44.35 | 1253 | 0.261 | 3.27 | 3863 | 145.16 | 8.63 | 96 |
| 45.% | 44.33 | 1527 | 0.320 | 4.11 | 4249 | 182.31 | 8.37 | ||
| 50.% | 44.30 | 1983 | 0.414 | 5.86 | 4815 | 259.41 | 7.65 | ||
| 55.% | 44.26 | 2469 | 0.517 | 8.26 | 5373 | 365.43 | 6.76 | ||
| 60.% | 44.21 | 2935 | 0.617 | 10.58 | 5800 | 467.56 | 6.28 | ||
| 65.% | 44.16 | 3400 | 0.722 | 13.15 | 6234 | 580.61 | 5.86 | ||
| 70.% | 44.12 | 3933 | 0.843 | 16.13 | 6643 | 711.69 | 5.53 | ||
| 75.% | 44.05 | 4476 | 0.963 | 19.73 | 7058 | 869.19 | 5.15 | ||
| 80.% | 43.97 | 5042 | 1.102 | 24.10 | 7500 | 1059.85 | 4.76 | ||
| 90.% | 43.80 | 6182 | 1.383 | 33.50 | 8169 | 1467.45 | 4.21 | ||
| 100.% | 43.58 | 7053 | 1.723 | 47.04 | 8831 | 2049.62 | 3.44 | ||
| BGS-FW4125 KV540 APC15*8 | 40.% | 22.38 | 1674 | 0.341 | 11.21 | 4943 | 250.81 | 6.68 | 84 |
| 45.% | 22.34 | 1929 | 0.395 | 13.58 | 5313 | 303.32 | 6.36 | ||
| 50.% | 22.29 | 2205 | 0.452 | 16.21 | 5650 | 361.27 | 6.10 | ||
| 55.% | 22.24 | 2492 | 0.513 | 19.14 | 5978 | 425.84 | 5.85 | ||
| 60.% | 22.18 | 2864 | 0.595 | 23.20 | 6382 | 514.39 | 5.57 | ||
| 65.% | 22.10 | 3233 | 0.676 | 27.69 | 6806 | 611.87 | 5.28 | ||
| 70.% | 22.02 | 3655 | 0.766 | 32.79 | 7193 | 722.03 | 5.06 | ||
| 75.% | 21.93 | 4081 | 0.863 | 38.58 | 7571 | 845.87 | 4.82 | ||
| 80.% | 21.80 | 4541 | 0.970 | 45.80 | 7963 | 998.46 | 4.55 | ||
| 85.% | 21.68 | 4951 | 1.072 | 52.89 | 8301 | 1146.84 | 4.32 | ||
| 90.% | 21.52 | 5163 | 1.213 | 62.57 | 8577 | 1346.88 | 3.83 | ||
| 100.% | 21.36 | 5537 | 1.344 | 72.77 | 8879 | 1554.08 | 3.56 | ||
| BGS-FW4125 KV540 APC16*8 | 40.% | 22.20 | 1798 | 0.378 | 11.43 | 4637 | 253.85 | 7.08 | 97 |
| 45.% | 22.16 | 2069 | 0.437 | 13.89 | 4970 | 307.76 | 6.72 | ||
| 50.% | 22.11 | 2380 | 0.502 | 16.79 | 5309 | 371.33 | 6.41 | ||
| 55.% | 22.05 | 2771 | 0.585 | 20.26 | 5686 | 446.90 | 6.20 | ||
| 60.% | 21.96 | 3241 | 0.694 | 25.87 | 6118 | 568.11 | 5.70 | ||
| 65.% | 21.86 | 3738 | 0.804 | 31.71 | 6522 | 693.11 | 5.39 | ||
| 70.% | 21.77 | 4145 | 0.896 | 37.21 | 6873 | 810.01 | 5.12 | ||
| 75.% | 21.66 | 4635 | 1.011 | 44.10 | 7239 | 955.01 | 4.85 | ||
| 80.% | 21.51 | 5207 | 1.149 | 52.74 | 7597 | 1134.53 | 4.59 | ||
| 90.% | 21.23 | 6054 | 1.370 | 69.58 | 8206 | 1477.35 | 4.10 | ||
| 100.% | 21.03 | 6618 | 1.528 | 81.72 | 8492 | 1718.70 | 3.85 |
The 4125 Brushless Outrunner Motor is engineered for large fixed-wing UAVs, delivering exceptional power, high efficiency, and reliable performance for long-endurance missions. Available in 250KV and 540KV (customizable), it provides up to 7 kg of maximum thrust when paired with the recommended propeller and ESC. Optimized for 6–12S LiPo battery systems, it features a high-efficiency magnetic circuit, precision-balanced rotor, and premium bearings to ensure smooth operation, low vibration, and extended service life. Ideal for fixed-wing drones, VTOL UAVs, mapping aircraft, surveillance platforms, cargo UAVs, and industrial long-range UAV applications. Custom KV ratings, shaft dimensions, cable length, and mounting configurations are available to support OEM and ODM requirements.
Compared with multirotor aircraft, fixed-wing UAVs typically operate for longer durations, fly over greater distances, and maintain higher cruising speeds. These mission profiles place greater demands on propulsion efficiency and continuous power output. BGS motors are optimized to operate efficiently across a wide RPM range, helping improve flight endurance while maintaining stable performance throughout extended missions.
Each motor is manufactured using high-grade permanent magnets, precision CNC-machined aluminum components, premium bearings, and high-temperature copper windings. The lightweight yet robust structure reduces overall aircraft weight while ensuring excellent mechanical strength and vibration resistance, even under continuous high-load operation.
Our fixed-wing UAV motors are compatible with various propeller sizes, ESC configurations, and battery systems, allowing seamless integration into different aircraft platforms. Whether used in hand-launched UAVs, VTOL fixed-wing aircraft, mapping drones, surveillance systems, environmental monitoring platforms, or long-range logistics UAVs, they deliver dependable propulsion and smooth flight characteristics.
To meet diverse project requirements, BGS also offers OEM and ODM customization services, including KV value adjustment, shaft configuration, mounting dimensions, winding optimization, waterproof protection, and other application-specific modifications. Every motor undergoes rigorous quality inspection and dynamic balancing before shipment to ensure consistent performance, low vibration, and reliable operation in demanding environments.
Built for efficiency, durability, and precision, BGS fixed-wing UAV motors provide a dependable propulsion solution for next-generation autonomous and industrial UAV applications.
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