Product overview
The T-MOTOR AT4125 VTOL Fixed Wing Aircraft Long Shaft Motor KV250/KV540 is a propulsion component intended for 8-10kg VTOL fixed-wing aircraft. Its construction combines steel, aluminum, bearings and neodymium rare-earth magnets in a 12N14P configuration. Both long-shaft variants occupy a Φ50*74mm motor envelope, with 6mm internal and external shaft diameters and 100mm enameled lead wire. T-MOTOR recommends pairing the motor with its AT115A ESC and FS15*8 folding propellers, providing a specific starting combination for propulsion integration.
The KV250 version is rated for 12S LiPo operation, weighs 350g including cable, and specifies 50A peak current and 2200W maximum power for 180 seconds. The KV540 version uses a 6S LiPo rating, weighs 355g including cable, and specifies 85A and 2000W over the same duration. These time-qualified limits matter when selecting the electrical configuration. The motor package has a stated weight of 525g and dimensions of 145*95*65mm. Its contents list names one AT3520 motor and a hardware pack, creating an unresolved designation mismatch with the AT4125 product identity.
Specifications
| Specification | Value & conditions |
|---|---|
| Manufacturer and model | T-MOTOR AT4125 VTOL Fixed Wing Aircraft Long Shaft Motor KV250/KV540 |
| Intended aircraft | 8-10kg VTOL fixed-wing aircraft |
| Construction | Bearings, high-strength steel, lightweight aluminum and neodymium rare-earth magnets |
| Recommended propulsion components | T-Motor AT115A ESC and T-Motor FS15*8 folding propellers |
| Listed package contents | 1x T-MOTOR AT3520 Motor and 1x hardware pack; the listed motor designation differs from AT4125 |
| Packaging weight | 525gPackaged product. |
| Packaging dimensions | 145*95*65mmPackaged product. |
| First motor configuration | Long Shaft KV250 |
| Motor weight | 350gLong Shaft KV250; including cable. |
| Motor dimensions | Φ50*74mmLong Shaft KV250 and Long Shaft KV540. |
| Internal resistance | 68mΩLong Shaft KV250. |
| Lead wire | 100mm enameled wireLong Shaft KV250 and Long Shaft KV540. |
| Motor configuration | 12N14PLong Shaft KV250 and Long Shaft KV540. |
| Shaft diameter | IN: 6mm; OUT: 6mmLong Shaft KV250 and Long Shaft KV540. |
| Rated voltage | 12SLong Shaft KV250; LiPo battery. |
| Idle current | 1.0ALong Shaft KV250; 10V. |
| Peak current | 50ALong Shaft KV250; 180s. |
| Maximum power | 2200WLong Shaft KV250; 180S. |
| Specification recommendation entry | /Long Shaft KV250. |
| Second motor configuration | Long Shaft KV540 |
| Motor weight | 355gLong Shaft KV540; including cable. |
| Internal resistance | 14mΩLong Shaft KV540. |
| Rated voltage | 6SLong Shaft KV540; LiPo battery. |
| Idle current | 2.6ALong Shaft KV540; 10V. |
| Peak current | 85ALong Shaft KV540; 180s. |
| Maximum power | 2000WLong Shaft KV540; 180S. |
| Specification recommendation entry | /Long Shaft KV540. |
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