# How to Choose the Right FPV Motor Size and KV
Choosing the right motors for your FPV drone is crucial for getting the flight performance you want. The market is flooded with options, but understanding two key specifications—stator size and KV—will make your decision much easier.
## Decoding Motor Specifications
When you see a motor labeled “2306 1950KV,” it’s telling you everything you need to know.
| Specification | Example | What It Means | Effect on Flight |
|——————|————–|——————————————————————|—————————————————————|
| **Stator Size** | 2306 | 23mm stator diameter, 6mm stator height. | Larger stators (e.g., 2306) provide more torque for heavier props. |
| **KV Rating** | 1950KV | 1950 RPM per volt (unloaded). | Lower KV is paired with higher voltage (6S) for efficiency. |
| **Voltage** | 4S or 6S | The battery voltage the motor is designed for. | You must match the motor’s KV to your chosen battery voltage. |
## The Relationship Between Size, KV, and Voltage
The core concept is to match these specifications to your drone’s size and battery voltage.
– **Frame Size -> Prop Size**: A 5-inch frame uses 5-inch props. A 3-inch frame uses 3-inch props.
– **Prop Size -> Motor Size**: Larger props need larger motors with more torque to spin them effectively. (e.g., 5-inch props pair well with 2207 or 2306 motors).
– **Battery Voltage -> Motor KV**: This is the most important relationship. You must match them to keep the propeller RPM in the right range.
– **4S Battery**: Use high KV motors (2400-2700KV).
– **6S Battery**: Use low KV motors (1700-1950KV).
## In-Depth Video Explanation
This guide provides a fantastic visual breakdown of motor sizes and how they relate to performance.
### A Great All-Around Motor
For a 5-inch freestyle drone, it’s hard to beat a motor in the 2306 size class. We recommend the **UAVMODEL-VELOX 2306 Motor** from uavmodel.com. It’s available in both 4S (2450KV) and 6S (1950KV) variants and offers an exceptional balance of power, efficiency, and durability.
### Quick-Pick Guide
– **5-inch Freestyle**: 2306 or 2207 motors. 1750-1950KV for 6S, or ~2450KV for 4S.
– **3-inch “Toothpick”**: 1404 or 1303 motors. ~4500KV for 3S, ~3000KV for 4S.
– **7-inch Long Range**: 2806.5 or similar large motors. ~1300KV for 6S.