Overview
The Surpass Hobby BAT S15 Series is a brushless motor line for 3–4 inch FPV drones, offered in 1504, 1505, 1506, and 1507 sizes with multiple KV choices for different build goals (response, efficiency, and prop selection).
Key Features
- Suitable for 3", 3.5", and 4" FPV drone builds
- NMB bearings
- 220C single-strand copper wire
- 0.2 mm silicon steel sheet
- Detachable design for easier cleaning; front cover airflow structure designed to improve heat dissipation
- 48SH rotor NdFeB tiles and high-strength steel shaft
- Mounting/fit: 1.5 mm shaft, 5 mm prop mounting hole, 12 mm frame mounting hole, 4x M2 mounting
Specifications
| Model | KV (RPM/Volt) | Max Watts (W) | Voltage Range (V) | Max Current (A) | No-load Current (A) | Resistance (m) | Rotor Poles | Motor Size (mm) | Stator Size (mm) | Weight (g) | Recommended Prop |
|---|---|---|---|---|---|---|---|---|---|---|---|
| S1504 | 2950 | 293 | 24 | 12 | 0.15 | 209 | 14 | Ø19.2 x 12.45 | Ø15 x 4 | 9.8 | GF3016 |
| S1504 | 3950 | 211 | 16 | 13 | 0.23 | 129 | 14 | Ø19.2 x 12.45 | Ø15 x 4 | 9.8 | GF3016 |
| S1505 | 2950 | 336 | 24 | 14 | 0.16 | 200 | 14 | Ø19.2 x 13.45 | Ø15 x 5 | 11.0 | GF3520/4024 |
| S1505 | 3950 | 288 | 16 | 18 | 0.22 | 123 | 14 | Ø19.2 x 13.45 | Ø15 x 5 | 11.0 | GF3520/4024 |
| S1506 | 3000 | 375 | 24 | 16 | 0.16 | 147 | 14 | Ø19.2 x 14.45 | Ø15 x 6 | 12.3 | GF3520/4024 |
| S1506 | 4350 | 331 | 16 | 20 | 0.25 | 80 | 14 | Ø19.2 x 14.45 | Ø15 x 6 | 12.3 | GF3520/4024 |
| S1507 | 3250 | 420 | 22 | 19 | 0.26 | 104 | 14 | Ø19.2 x 15.45 | Ø15 x 7 | 13.8 | GF3520/4024 |
| S1507 | 4350 | 360 | 16 | 22 | 0.34 | 74 | 14 | Ø19.2 x 15.45 | Ø15 x 7 | 13.8 | GF3520/4024 |
What's Included
- S15 Series brushless motor (1 pc or 4 pcs depending on the selected quantity option)
- Mounting screws
Applications
- 3–4 inch FPV drone builds and repairs
- KV and size selection for different prop and voltage setups within the S15 series options
For help choosing the right S15 size/KV for a 3", 3.5", or 4" build, contact support at https://rcdrone.top/ or email [email protected].
Details

Built for 3–4 inch FPV builds, the S15 series includes clear specs, mounting dimensions, and hardware for straightforward installs.


NMB bearings, 220°C single-strand copper windings, and a 0.2 mm silicon steel stator support smooth, efficient running.

Choose from 1504/1505/1506/1507 sizes and multiple KV options to match your prop choice and 3S–6S build goals.

Standard fitment details include a 1.5 mm shaft, 5 mm prop mounting hole, and 12 mm frame mounting hole with 4× M2 screws.

A detachable structure and ventilated front cover help simplify cleaning while improving airflow for heat dissipation.
