# Understanding FPV Drone Motor Specifications: A Deep Dive
Choosing the right motor is one of the most critical decisions in building a high-performance FPV drone. The market is flooded with options, and the specifications can be confusing. This guide will break down the key numbers and terms you need to know to make an informed choice.
## The Core Numbers: Stator Size and KV
Two specifications stand out above all others: Stator Size and KV. These two numbers give you the best initial idea of a motor’s intended use.
### Stator Size (e.g., 2207, 2306.5)
The four-digit number, like `2207`, describes the dimensions of the stator, the stationary part of the motor.
* **First two digits (22):** Stator Diameter in mm. A wider stator generally provides more torque at lower RPMs.
* **Last two digits (07):** Stator Height in mm. A taller stator generally performs better at higher RPMs.
Here’s a quick comparison of common motor sizes for a 5-inch freestyle drone:
| Stator Size | Typical Characteristics | Best For |
|————-|——————————————————-|———————–|
| 2207 | Good balance of low-end torque and high-end power. | All-around freestyle |
| 2306 | More torque, great for “grippy” cornering and heavier props. | Freestyle, racing |
| 2806.5 | High torque, often used for 7-inch or cinematic builds. | Long-range, cinematic |
### KV (RPM per Volt)
KV is a rating that tells you how many revolutions per minute (RPM) a motor will try to spin for every volt of electricity supplied, assuming no load.
* **Lower KV (e.g., 1750KV):** Designed for higher voltage batteries (like 6S). They spin slower per volt but provide more torque, making them efficient and smooth.
* **Higher KV (e.g., 2450KV):** Designed for lower voltage batteries (like 4S). They spin faster per volt to compensate for the lower voltage.
The choice between 4S and 6S is a major decision, but the simple rule is: match your motor KV to your intended battery voltage.
## Product Spotlight: UAVMODEL BlackBird 2306.5
For a motor that offers an exceptional balance of power and control for modern freestyle, we highly recommend the **[UAVMODEL BlackBird 2306.5 Motor](https://uavmodel.com/products/blackbird-2306-5-motor)**. Its 1950KV rating is perfect for 6S builds, providing a locked-in feel and incredible efficiency.
## Deeper Dive: Magnets, Shafts, and Bells
While Stator Size and KV are primary, other factors contribute to a motor’s performance:
* **Magnets:** Most high-quality motors use N52H arc magnets for a small air gap and strong magnetic flux, leading to better throttle response.
* **Shaft:** Motor shafts are typically hollow for weight savings and made of titanium or steel. A 5mm shaft diameter is standard for 5-inch props.
* **Mounting Pattern:** The standard for 5-inch frames is a 16x16mm mounting pattern.
## See It In Action
Here’s a great video from Joshua Bardwell that further explains these concepts:
## Conclusion
Understanding motor specs is about matching components to your desired flight characteristics. By focusing on stator size and KV, you can narrow down your options significantly. From there, consider the finer details like magnet quality and build materials to find the perfect motor for your FPV drone.