# FPV Drone Motor Sizing Guide: Stator Volume, KV, and Torque Principles
Choosing the right motor for your FPV drone involves more than picking a random 2207 or 2306. Stator volume, KV rating, and torque characteristics directly determine how your quad handles. This guide breaks down the physics in practical terms so you can select motors confidently for any build.
## Understanding Stator Dimensions
Motor size labels like “2207” follow the format: **Stator Width (mm) × Stator Height (mm)**. The stator is the stationary coil assembly inside the motor.
– **22** = stator is 22mm wide
– **07** = stator is 7mm tall
| Stator Size | Stator Volume (mm³) | Best Prop Size | Build Type |
|—|—|—|—|
| 1204 | 452 | 2.5-3″ | Toothpick / lightweight micro |
| 1404 | 616 | 3-4″ | 3″ cinewhoop / ultralight 4″ |
| 2004 | 1257 | 5″ | Long-range cruiser |
| 2207 | 2661 | 5″ | Freestyle standard |
| 2306 | 2493 | 5″ | Racing / quick response |
| 2505 | 2454 | 5-6″ | Heavy cinematic lifter |
## KV Rating Explained
KV means RPM per volt with no load. A 2400KV motor on 4S (16.8V) produces roughly 40,320 RPM unloaded.
– **Low KV (1700-2000KV)**: More torque, lower top-end RPM — ideal for 6S heavy builds and props with aggressive pitch
– **Mid KV (2400-2700KV)**: The sweet spot for 5″ freestyle on 4S to 6S
– **High KV (3000+KV)**: High RPM, less torque — micro builds on 2S-3S
## Torque: The Real Performance Metric
Stator volume directly correlates with torque. A wider and taller stator generates more magnetic force. More torque means:
– Faster propeller acceleration (responsive throttle)
– Better prop wash handling
– Less RPM sag under load
## Motor-Prop Matching Table
| Build Weight | Battery | Recommended Motor | Prop | KV Range |
|—|—|—|—|—|
| <250g (sub-250) | 4S 850mAh | 2004 or 2203.5 | 5″ biblade | 2800-3200KV |
| 500-650g freestyle | 6S 1300mAh | 2207 | 5″ triblade | 1700-1950KV |
| 650-800g cinematic | 6S 1800mAh | 2306 or 2505 | 5.1″ triblade | 1700-1900KV |
| 800g+ heavy lifter | 6S 2200mAh | 2508 or 2807 | 6″ biblade | 1500-1700KV |
## Practical Selection Tips
1. **Wider stator = more torque** — a 2408 will hit harder on the low end than a 2207
2. **Taller stator = more top-end** — a 2208 has better high-RPM efficiency than a 2207
3. **Match motor weight to build** — heavy motors on a lightweight frame hurt handling and flight time
4. **N52SH curved magnets** in modern motors (like those stocked at [uavmodel.com](https://uavmodel.com)) deliver superior torque density and heat resistance