Product overview
The HOBBYWING RTF 4140 is a 300KV brushless motor for fixed-wing pusher propulsion, configured for a 12S LiPo battery. It has 12 slots and 14 poles, with a stator measuring 40.6 mm in diameter by 40 mm. The complete motor measures 51 mm in diameter and 73.5 mm high, and weighs 575 g including wire. Its mounting pattern is 4 × M4 on a 30 mm diameter circle, while direct enamelled-wire leads extend 120 mm.
A side-vented rotor bracket and hollowed stator mount reduce weight and provide a structure for heat dissipation during flight. The assembly uses three bearings and mechanical retention through a circlip and screws with anti-loosening treatment. Inside, 0.2 mm low-iron-loss silicon steel sheets accompany multi-strand parallel windings and N45SH arc magnets held by a retaining ring. The enamelled wire has a 220°C temperature-resistance rating and Class C insulation; the stator paint coating has a separate 180°C rating.
Rated power output is 1679 W, with maximum power specified as 6907.3 W for 10 seconds. Maximum current is 155.7 A for 10 seconds in a non-hermetic configuration at an ambient temperature of 25°C or below. No-load current is 2.6 A, and specified maximum thrust is 12.7 kg. Recommended ESCs for the RTF 4140 are the PLATINUM HV 180A V5 and Skywalker HV 160A OPTO V2. The recommended propeller combination uses the distinct designation RTF 4140SL 300KV and includes APC16×10, APC16×12, APC17×8, APC17×10, 15×12 and 16×13 options with a 12S LiPo battery.
Specifications
| Specification | Value & conditions |
|---|---|
| Model | RTF 4140 300KV |
| Motor size | Diameter 51 mm × height 73.5 mm |
| Slots and poles | 12 slots, 14 poles |
| Stator size | Φ40.6 × 40 mm |
| Dynamic balance | ≤20 mg |
| Stator process | High-standard silicon steel sheet; paint coating resistant to 180°C |
| Bearing | 1680ZZ |
| Enamelled wire | 220°C temperature resistance; Class C insulation |
| Fiber screw thread | 4 × M3 @ Φ20 |
| Insulation test | 500 V AC high-voltage withstand test500 V AC test voltage. |
| Motor mounting dimensions | 4 × M4 @ Φ30 |
| KV | 300 |
| Battery specification | 12S LiPo |
| No-load current | 2.6 ANo-load operation. |
| Maximum current | 155.7 A / 10 sNon-hermetic configuration; ambient temperature ≤25°C; 10-second duration. |
| Rated power output | 1679 W |
| Maximum power | 6907.3 W / 10 s10-second duration. |
| Maximum thrust | 12.7 kg |
| Resistance | 23.3 mΩ |
| Wire arrangement | Direct enamelled-wire lead-out |
| Wire length | 120 mm |
| Weight | 575 gWith wire. |
| Recommended-combination motor designation | RTF 4140SL 300KV |
| Recommended propellers | APC16×10; APC16×12; APC17×8; APC17×10; 15×12; 16×13Recommended combination for RTF 4140SL 300KV. |
| Recommended ESCs | PLATINUM HV 180A V5 / Skywalker HV 160A OPTO V2Recommended combination for RTF 4140SL 300KV. |
| Recommended battery | 12S LiPoRecommended combination for RTF 4140SL 300KV. |
| Product purpose | Fixed-wing pusher propulsion motor |
| Structural and cooling architecture | Side-vented rotor bracket and extensively hollowed stator mount |
| Bearing and retention architecture | Triple-bearing design; circlip-and-screw mechanical locking with anti-loosening treatment |
| Magnetic and winding materials | 0.2 mm low-iron-loss silicon steel sheets; multi-strand parallel enamelled-wire windings; N45SH arc magnets with a retaining ring |
| Product identity | RTF 4140Product page heading. |
| Rotor bracket | Side air ventsDescribed as reducing weight and improving heat dissipation while maintaining structural strength. |
| Mechanical retention | Circlip and screws with anti-loosening treatmentMotor mechanical locking system. |
| Cooling | Self-cooling outer rotor bracketDissipates heat from the coils during flight. |
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