Table of Contents

## How do you size a brushless motor?

The physical size of a particular brushless motor is usually indicated by a number that looks like this – ’22-05′. The first number, 22, indicates how wide the motor is whilst the second number, 05, indicates the hight. Usually, these are written on the motor casing themselves to show you how wide and high they are.

What size is a 540 brushless motor?

540 has a diameter of 36mm.

### What is a 10 size brushless motor?

The Power 10 is designed to deliver clean and quiet power for 10-size sport and scale airplanes weighing 32 to 48 ounces (910 to 1360 grams), 3D airplanes weighing 28 to 36 ounces (790 to 1020 grams), or models requiring up to 450 watts of power.

How do you calculate KV to RPM?

The Kv rating designates the RPM a motor will spin at full throttle when unloaded given an input voltage. To estimate the RPM of a motor, simply multiply the Kv value by the battery voltage. Kv is in units of RPM/Volt.

## How do I know what size brushless motor I need?

Electric motor power is stated in watts. 750 watts = 1 horsepower. An easy way to estimate power needs for RC hobby applications is to use 100 watts per pound for sport flying, 150 for aggressive aerobatics, 200 watts per pound for 3D flying.

Does higher KV mean faster motor?

Kv describes the RPM (revolutions per minute) a motor does per Volt that is put into it. Generally speaking the more Kv a motor has, the more RPM and more power. For example, a 9000Kv motor would be faster than a 2200Kv motor. If Kv is like horsepower, then Turns is the physical attribute of a motor.

### How big is a 550 engine?

A 550 is a physically larger motor. Same 36mm diameter, but while 540s are typically 50mm in length, a 550 can be anywhere from 55mm to 90mm long.

Is higher Kv better?

## How do I choose a Kv motor?

The KV of a motor can be determined by the number of copper wire windings in the stator. Generally, the higher number of turns of winding decreases the KV of the motor, while lower number of turns increases the KV. The magnetic strength of the magnets can also affect the KV value, stronger magnets will increase KV.

What is KV rating on brushless motors?

The Kv rating of a brushless motor is the ratio of the motor’s unloaded rpm to the peak voltage on the wires connected to the coils. Knowing the Kv rating of a motor will help you determine how fast that motor will rotate when a given voltage is applied to it.